CN107240909B - A kind of method and apparatus reducing influence of the compensator to route distance protection - Google Patents

A kind of method and apparatus reducing influence of the compensator to route distance protection Download PDF

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Publication number
CN107240909B
CN107240909B CN201710386979.4A CN201710386979A CN107240909B CN 107240909 B CN107240909 B CN 107240909B CN 201710386979 A CN201710386979 A CN 201710386979A CN 107240909 B CN107240909 B CN 107240909B
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voltage
compensator
threshold
electric current
route
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CN107240909A (en
Inventor
潘磊
田杰
董云龙
卢宇
黄如海
姜崇学
鲁江
***
邱德锋
谢华
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NR Electric Co Ltd
NR Engineering Co Ltd
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NR Electric Co Ltd
NR Engineering Co Ltd
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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
    • H02H7/26—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured

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  • Inverter Devices (AREA)
  • Emergency Protection Circuit Devices (AREA)

Abstract

A kind of method of influence the embodiment of the invention discloses reduction compensator to route distance protection; method includes: the first electric current of the series connection inverter in the route or compensator for obtain compensator access; after the voltage for the route that the bus or compensator for obtaining compensator access access obtains first voltage; first electric current is greater than predetermined current threshold and the first duration was greater than the first preset time threshold, exits series connection inverter and series transformer；First voltage is less than or equal to the first predetermined voltage threshold and when the second duration was greater than the second preset time threshold, the voltage of output voltage control compensator access bus based on series connection inverter is the first predetermined voltage threshold, and obtain the second electric current of element corresponding with the first electric current, second electric current is greater than predetermined current threshold and the third duration is greater than the first preset time threshold, exits series connection inverter and series transformer.The embodiment of the present invention disclose a kind of device for reducing influence of the compensator to route distance protection simultaneously.

Description

A kind of method and apparatus reducing influence of the compensator to route distance protection
Technical field
It adjusts the distance the technology of the influence of protection circuit the present invention relates to the reduction power electronic equipment in field of power system, More particularly to a kind of method and apparatus of influence of reduction compensator to route distance protection.
Background technique
With the fast development of the interconnection technique of electric system, the electric system of long distance power transmission has obtained widely answering With.During remote Operation of Electric Systems, it is easy to be influenced by factors such as environment, workload demands, system shake occurs The problem of swinging, the performances such as system stability contorting performance, alternating current-direct current mixing electric network coordination, power flowcontrol ability caused to decline.It is existing Using static synchronous series compensator (Static Synchronous Series Compensator, SSSC), uniformly in technology Flow controller (Interline between flow controller (Unified Power Flow Controller, UPFC) and line Power Flow Controller, IPFC), the control devices such as convertible static compensator solve above-mentioned technical problem.
Currently, the access for static synchronous series compensator or UPFC influences aspect to harmonics in the prior art Document has: " THE UPFC and its influence to relay protection ", " THE UPFC and its shadow for protection of adjusting the distance Ring ", the adaptive distance protection of the route containing THE UPFC " study ", patent document has: application number CN201510732288.6 and a kind of entitled distance protecting method for the transmission line of electricity containing THE UPFC, Application number CN201610309848.1 and the entitled rapid distance protection method for power transmission line containing UPFC and device, application Number CN201510371762.7 and a kind of entitled electricity with THE UPFC transmission line of electricity based on pattern-recognition Flow transient direction protection method, application number CN201510371647.X and entitled a kind of with THE UPFC The method for protecting transient state energy of transmission line of electricity.
But above-mentioned existing literature mainly according to the working principle of SSSC, UPFC, IPFC or convertible static compensator and Characteristic optimizes the defencive function of the line protective device of route distance protection, but does not consider to work as electric system Response characteristic is protected in the control of the equipment such as SSSC, UPFC, IPFC or convertible static compensator when failure, reduces route protection Equipment does not have engineering practicability to the distance protection performance of transmission line of electricity in electric system.
Summary of the invention
In order to solve the above technical problems, an embodiment of the present invention is intended to provide a kind of reduction compensators to route distance protection The method and apparatus of influence solve the problems, such as that the prior art has an impact the protective value of line protective device, it is ensured that line Road protects equipment to carry out the performance of distance protection to route, has ensured the safe and stable operation of electric system, ensure that engineering reality The property used.
In order to achieve the above objectives, the technical solution of the embodiment of the present invention is achieved in that
A method of reducing influence of the compensator to route distance protection, which comprises
The electric current for obtaining the series connection inverter in the route or compensator of compensator access, obtains the first electric current；Wherein, institute The electric current of route of the compensator for controlling compensator access is stated, the compensator includes static synchronous series compensator, uniformly Flow controller and convertible static compensator between flow controller, line；
The voltage for obtaining the bus of the compensator access or the route of compensator access, obtains first voltage；
Compare the relationship between first electric current and predetermined current threshold；
Compare the relationship between the first voltage and the first predetermined voltage threshold；
If first electric current is greater than the predetermined current threshold, and the first duration was greater than the first preset time threshold Value, exits the series connection inverter and series transformer；Wherein, the series transformer is the equipment in the compensator, institute Stating for the first duration is the duration that first electric current is greater than the predetermined current threshold；
If the first voltage is less than or equal to first predetermined voltage threshold, and the second duration was greater than second The voltage of preset time threshold, the bus based on the access of compensator described in the output voltage control of inverter of connecting is described First predetermined voltage threshold, and the electric current of element corresponding with first electric current is obtained, obtain the second electric current；Wherein, described Second duration was the duration that the first voltage is less than or equal to first predetermined voltage threshold；
If second electric current is greater than the predetermined current threshold, and the third duration is greater than first preset time Threshold value exits the series connection inverter and the series transformer；Wherein, the third duration is that second electric current is big In the duration of the predetermined current threshold.
Optionally, the electric current for obtaining element corresponding with first electric current also wraps after obtaining the second electric current It includes:
If second electric current is less than or equal to the predetermined current threshold, if second electric current be greater than it is described Predetermined current threshold and the third duration are less than or equal to first preset time threshold, acquisition and described first The voltage of the corresponding route of voltage, obtains second voltage；
Compare the relationship between the second voltage and first predetermined voltage threshold；
If if the second voltage is greater than first predetermined voltage threshold or the second voltage is equal to described first Predetermined voltage threshold, and the effect of the output voltage of the series connection inverter is the voltage for reducing the bus of the compensator access When for first predetermined voltage threshold, the voltage of the bus for the compensator access of removing controls is first predeterminated voltage Threshold value, and the electric current of the series connection inverter in the route or compensator that the acquisition compensator accesses is executed, obtain the first electric current.
Optionally, before the relationship between the second voltage and the first predetermined voltage threshold, further includes:
If the output voltage of the series connection inverter is the voltage rating of the series connection inverter, and the second voltage is small In or equal to first predetermined voltage threshold, keeping the output voltage of the series connection inverter is the series connection inverter Voltage rating.
Optionally, the electric current for obtaining element corresponding with first electric current also wraps after obtaining the second electric current It includes:
If second electric current is less than or equal to the predetermined current threshold, if second electric current be greater than it is described Predetermined current threshold and the third duration are less than or equal to first preset time threshold, acquisition and described first The voltage of the corresponding route of voltage, obtains second voltage；
Compare the relationship between the second voltage and the second predetermined voltage threshold；
If the second voltage is less than second predetermined voltage threshold, and the 4th duration was more than or equal to third Preset time threshold, the output voltage that the series connection inverter is arranged is zero, obtains route corresponding with the first voltage Voltage obtains tertiary voltage；Wherein, the 4th duration is that the second voltage is default less than or equal to described second The duration of voltage threshold；
If the tertiary voltage is greater than second predetermined voltage threshold, and the 5th duration is more than or equal to described Third preset time threshold, the output voltage for cancelling the setting series connection inverter is zero, and is obtained and the first voltage pair The voltage for the route answered obtains the 4th voltage；Wherein, the 5th duration is that the tertiary voltage is greater than described second in advance If the duration of voltage threshold；
If if the 4th voltage is greater than first predetermined voltage threshold or the 4th voltage is equal to described first Predetermined voltage threshold, and the effect of the output voltage of the series connection inverter is the voltage for reducing the bus of the compensator access When for first predetermined voltage threshold, the voltage of the bus for the compensator access of removing controls is first predeterminated voltage Threshold value, and the electric current of the series connection inverter in the route or compensator that the acquisition compensator accesses is executed, obtain the first electric current；
If the second voltage be greater than second predetermined voltage threshold, if the second voltage be less than or equal to Second predetermined voltage threshold and the 4th duration are less than the third preset time threshold, acquisition and described first The voltage of the corresponding route of voltage, obtains the 5th voltage；
If the 5th voltage be greater than first predetermined voltage threshold, if the 5th voltage be equal to described first Predetermined voltage threshold, and the effect of the output voltage of the series connection inverter is the voltage for reducing the bus of the compensator access When for first predetermined voltage threshold, the voltage of the bus for the compensator access of removing controls is first predeterminated voltage Threshold value, and the electric current of the series connection inverter in the route or compensator that the acquisition compensator accesses is executed, obtain the first electric current.
It is optionally, described to exit the series connection inverter and the series transformer, comprising:
It is latched the series connection inverter, and triggers and is connected with the quick by-pass switch of the series transformer parallel connection；
It is closed the mechanical bypass switch in parallel with the series transformer.
It is optionally, described to exit after the series connection inverter and the series transformer, further includes:
When preset time arrives, the electric current and voltage of the route of the compensator access are obtained；
If the electric current of the route of compensator access is within the scope of predetermined current, and the route of compensator access Voltage enables the series connection inverter and the series transformer in predetermined voltage range.
Optionally, the electric current for obtaining element corresponding with first electric current also wraps after obtaining the second electric current It includes:
When second electric current is less than or equal to the predetermined current threshold, if second electric current be greater than it is described When predetermined current threshold and the third duration are less than or equal to first preset time threshold, send first and execute It instructs to line protective device；Wherein, the route that the line protective device is used to that the compensator to be protected to access, described first Execute instruction the distance protection for being used to indicate the route that the line protective device accesses compensator according to the first preset rules Impedance definite value is updated；
Timing obtains the second voltage after being spaced preset time period after transmission described first executes instruction；
When the second voltage be greater than second predetermined voltage threshold, and the 6th duration be greater than third preset time When threshold value, sends second and execute instruction to the line protective device；Wherein, the 6th duration is the second voltage Greater than the duration of second predetermined voltage threshold, second executes instruction and is used to indicate the line protective device and restores institute The distance protection impedance definite value for stating the route of compensator access is to update the distance protection impedance of the route of the compensator access Value before definite value.
Optionally, quick by-pass switch is in parallel with the series transformer, mechanical bypass switch and the series transformer Parallel connection, it is described to exit after the series connection inverter and the series transformer, further includes:
When the mechanical bypass switch disconnects, sends third and execute instruction to the line protective device；Wherein, described Third executes instruction the distance for being used to indicate the route that the line protective device accesses compensator according to the second preset rules Protection impedance definite value is updated；
Since timing after sending the third and executing instruction after being spaced preset time period, obtain the compensator access Route electric current and voltage；
If the electric current of the route of compensator access is within the scope of predetermined current, and the route of compensator access Voltage enables the series connection inverter and the series transformer in predetermined voltage range；
When mechanical bypass switch closure, notification signal is sent to the line protective device；Wherein, the notice The distance protection impedance definite value for the route that signal is used to that the line protective device to be notified to restore the compensator access is update Value before the distance protection impedance definite value of the route of the compensator access.
Optionally, first preset time threshold is less than at the first time；Wherein, the first time is that the route is protected Time needed for the I sections of progress analytical calculations of distance protection for the route that shield equipment accesses the compensator and the distance protection The sum of I sections protection act delay time；
Alternatively, first preset time threshold is less than the difference of the first time and the response time of quick by-pass switch Value.
A method of reducing influence of the compensator to route distance protection, which comprises
Compensator is sent first is received to execute instruction；
It responds described first to execute instruction, obtain the distance protection impedance definite value of the route of compensator access and is set as the One impedance；
Based on first impedance and the first preset rules, the distance protection impedance for updating the route of compensator access is fixed Value；
The compensator is sent second is received to execute instruction；
It responds described second to execute instruction, sets institute for the distance protection impedance definite value for the route that the compensator accesses State the first impedance.
Optionally, the distance protection resistance of the route of compensator access is updated based on first impedance and the first preset rules Anti- definite value, comprising:
The impedance in the line side based on compensator access carries out equivalent process to the impedance of series connection inverter, obtains Second impedance；
First impedance, second impedance are added with the leakage reactance of the series transformer, obtain third impedance；
The distance protection impedance definite value for updating the route of the compensator access is the third impedance.
A method of reducing influence of the compensator to route distance protection, which comprises
The third that compensator is sent is received to execute instruction；
It responds the third to execute instruction, the first impedance is added to obtain the 4th impedance with the leakage reactance of series transformer； Wherein, first impedance is the distance protection impedance definite value of the route of compensator access；
The 4th impedance is set by the distance protection impedance definite value for the route that the compensator accesses；
Receive the notification signal that the compensator is sent；
The notification signal is responded, and sets described for the distance protection impedance definite value for the route that the compensator accesses First impedance.
A method of reducing influence of the compensator to route distance protection, which comprises
The series connection change of current when the route of compensator access works normally, in the route or compensator of detection compensator access The electric current of device obtains the first electric current, and detects the voltage of the bus of compensator access or the route of compensator access, obtains first Voltage；
Compare the relationship between first electric current and predetermined current threshold；
If first electric current is greater than the predetermined current threshold, and the first duration was greater than the first preset time threshold Value, is latched the series connection inverter, and triggering is connected with the quick by-pass switch of the series transformer parallel connection, and closure with it is described The mechanical bypass switch of series transformer parallel connection；Wherein, first duration is that first electric current is greater than described preset The duration of current threshold；
Compare the relationship between the first voltage and the first predetermined voltage threshold；
If the first voltage is less than or equal to first predetermined voltage threshold, and the second duration was greater than second The voltage of preset time threshold, the bus based on the access of compensator described in the output voltage control of inverter of connecting is described First predetermined voltage threshold, and the electric current of element corresponding with first electric current is obtained, obtain the second electric current；Wherein, described Second duration was the duration that the first voltage is less than or equal to first predetermined voltage threshold；
If second electric current is greater than the predetermined current threshold, and the third duration is greater than first preset time Threshold value is latched the series connection inverter, and triggering is connected with the quick by-pass switch of the series transformer parallel connection, and closure and institute State the mechanical bypass switch of series transformer parallel connection；Wherein, the third duration is second electric current greater than described pre- If the duration of current threshold；
If second electric current is less than or equal to the predetermined current threshold, if second electric current be greater than it is described Predetermined current threshold and the third duration are less than or equal to first preset time threshold, acquisition and described first The voltage of the corresponding route of voltage, obtains second voltage；
If if the second voltage is greater than first predetermined voltage threshold or the second voltage is equal to described first Predetermined voltage threshold, and the effect of the output voltage of the series connection inverter is the voltage for reducing the bus of the compensator access When for first predetermined voltage threshold, the voltage of the bus for the compensator access of removing controls is first predeterminated voltage Threshold value, and the electric current of the series connection inverter in the route or compensator that the acquisition compensator accesses is executed, obtain the first electric current.
A kind of compensator, the compensator include: first acquisition unit, the first comparing unit, exit at unit and first Manage unit；Wherein:
The first acquisition unit, for obtaining the electricity of the series connection inverter in the route or compensator that compensator accesses Stream, obtains the first electric current；Wherein, the compensator is used to control the electric current of the route of compensator access, and the compensator includes Flow controller and convertible static compensator between static synchronous series compensator, THE UPFC, line；
The first acquisition unit is also used to obtain the bus of the compensator access or the route of compensator access Voltage, obtain first voltage；
First comparing unit, for the relationship between first electric current and predetermined current threshold；
First comparing unit, the relationship being also used between first voltage described in comparison and the first predetermined voltage threshold；
It is described to exit unit, if being greater than the predetermined current threshold for first electric current, and the first duration is big In the first preset time threshold, the series connection inverter and series transformer are exited；Wherein, the series transformer is the benefit The equipment in device is repaid, first duration is the duration that first electric current is greater than the predetermined current threshold；
The first processing units, if being less than or equal to first predetermined voltage threshold for the first voltage, And second the duration be greater than the second preset time threshold, based on it is described series connection inverter output voltage control described in compensator The voltage of the bus of access is first predetermined voltage threshold, and obtains the electric current of element corresponding with first electric current, Obtain the second electric current；Wherein, second duration is that the first voltage is less than or equal to first predeterminated voltage The duration of threshold value；
It is described to exit unit, if being also used to second electric current is greater than the predetermined current threshold, and third duration Greater than first preset time threshold, the series connection inverter and the series transformer are exited；Wherein, the third continues Time is the duration that second electric current is greater than the predetermined current threshold.
Optionally, after the first processing units further include: the second comparing unit and the second processing unit；Wherein:
The first acquisition unit, if second electric current is also used to less than or equal to the predetermined current threshold, or If person's second electric current is greater than the predetermined current threshold and the third duration is less than or equal to described first in advance If time threshold, the voltage of route corresponding with the first voltage is obtained, second voltage is obtained；
Second comparing unit, for the pass between the second voltage and first predetermined voltage threshold System；
Described the second processing unit, if if being greater than first predetermined voltage threshold or described for the second voltage Second voltage is equal to first predetermined voltage threshold, and the effect of the output voltage of the series connection inverter is to reduce the benefit When the voltage for repaying the bus of device access is first predetermined voltage threshold, the electricity of the bus for the compensator access of removing controls Pressure is first predetermined voltage threshold, and executes the series connection inverter in the route or compensator that the acquisition compensator accesses Electric current, obtain the first electric current.
Optionally, before second comparing unit further include: setting unit；Wherein:
The setting unit, if the output voltage for the series connection inverter is the specified electricity of the series connection inverter Pressure, and the second voltage is less than or equal to first predetermined voltage threshold, keeps the output electricity of the series connection inverter Pressure is the voltage rating of the series connection inverter.
Optionally, after the first processing units further include: third processing unit and fourth processing unit；Wherein:
The first acquisition unit, if second electric current is also used to less than or equal to the predetermined current threshold, or If person's second electric current is greater than the predetermined current threshold and the third duration is less than or equal to described first in advance If time threshold, the voltage of route corresponding with the first voltage is obtained, second voltage is obtained；
First comparing unit, the relationship being also used between second voltage described in comparison and the second predetermined voltage threshold；
The third processing unit, if being less than second predetermined voltage threshold for the second voltage, and the 4th holds The continuous time is more than or equal to third preset time threshold, and the output voltage that the series connection inverter is arranged is zero, acquisition and institute The voltage for stating the corresponding route of first voltage, obtains tertiary voltage；Wherein, the 4th duration is that the second voltage is small In or equal to second predetermined voltage threshold duration；
The third processing unit, if being also used to the tertiary voltage is greater than second predetermined voltage threshold, and the 5th Duration is more than or equal to the third preset time threshold, and the output voltage for cancelling the setting series connection inverter is Zero, and the voltage of route corresponding with the first voltage is obtained, obtain the 4th voltage；Wherein, the 5th duration is The tertiary voltage is greater than the duration of second predetermined voltage threshold；
The fourth processing unit, if if being greater than first predetermined voltage threshold or described for the 4th voltage 4th voltage is equal to first predetermined voltage threshold, and the effect of the output voltage of the series connection inverter is to reduce the benefit When the voltage for repaying the bus of device access is first predetermined voltage threshold, the electricity of the bus for the compensator access of removing controls Pressure is first predetermined voltage threshold, and executes the series connection inverter in the route or compensator that the acquisition compensator accesses Electric current, obtain the first electric current；
The first acquisition unit, if being also used to the second voltage greater than second predetermined voltage threshold, Huo Zheruo The second voltage is less than or equal to second predetermined voltage threshold and the 4th duration is pre- less than the third If time threshold, the voltage of route corresponding with the first voltage is obtained, the 5th voltage is obtained；
The fourth processing unit, if being also used to the 5th voltage greater than first predetermined voltage threshold, Huo Zheruo 5th voltage is equal to first predetermined voltage threshold, and the effect of the output voltage of the series connection inverter is reduction institute When the voltage for stating the bus of compensator access is first predetermined voltage threshold, the bus for the compensator access of removing controls Voltage be first predetermined voltage threshold, and execute it is described acquisition compensator access route or compensator in series connection change The electric current for flowing device, obtains the first electric current.
Optionally, the unit that exits includes: first processing module and Second processing module；Wherein:
The first processing module for being latched the series connection inverter, and triggers in parallel with the series transformer Quick by-pass switch conducting；
The Second processing module, for being closed the mechanical bypass switch in parallel with the series transformer.
Optionally, described to exit after unit further include: second acquisition unit and first enables unit；Wherein:
The second acquisition unit, the electric current of the route for when preset time arrives, obtaining the compensator access And voltage；
It is described first enable unit, if for the compensator access route electric current within the scope of predetermined current, and The voltage of the route of the compensator access enables the series connection inverter and the series-transformer in predetermined voltage range Device.
Optionally, after the first processing units further include: the first transmission unit and third acquiring unit；Wherein:
First transmission unit is less than or equal to the predetermined current threshold for working as second electric current, or If second electric current is greater than the predetermined current threshold and the third duration is less than or equal to described first and presets When time threshold, sends first and execute instruction to line protective device；Wherein, the line protective device is for protecting the benefit The route of device access is repaid, described first executes instruction and be used to indicate the line protective device according to the first preset rules to compensation The distance protection impedance definite value of the route of device access is updated；
The third acquiring unit, for since send described first execute instruction after timing, be spaced preset time period Afterwards, the second voltage is obtained；
First transmission unit is also used to be greater than second predetermined voltage threshold, and the 6th when the second voltage When duration is greater than third preset time threshold, sends second and execute instruction to the line protective device；Wherein, described Six duration were the duration that the second voltage is greater than second predetermined voltage threshold, and described second executes instruction use Restore the distance protection impedance definite value of the route of the compensator access in the instruction line protective device to update the benefit Repay the value before the distance protection impedance definite value of the route of device access.
Optionally, quick by-pass switch is in parallel with the series transformer, mechanical bypass switch and the series transformer Parallel connection, it is described to exit after unit further include: the second transmission unit, the 4th acquiring unit and second enable unit；Wherein:
Second transmission unit, for sending third and executing instruction to described when the mechanical bypass switch disconnects Line protective device；Wherein, the third, which executes instruction, is used to indicate the line protective device according to the second preset rules pair The distance protection impedance definite value of the route of compensator access is updated；
Since the 4th acquiring unit be spaced preset time period for timing after sending the third and executing instruction Afterwards, the electric current and voltage of the route of the compensator access are obtained；
It is described second enable unit, if for the compensator access route electric current within the scope of predetermined current, and The voltage of the route of the compensator access enables the series connection inverter and the series-transformer in predetermined voltage range Device；
Second transmission unit is also used to send notification signal to the line when the mechanical bypass switch is closed Protect equipment in road；Wherein, the route that the notification signal is used to that the line protective device to be notified to restore the compensator access Distance protection impedance definite value be the distance protection impedance definite value for updating the route of compensator access before value.
Optionally, first preset time threshold is less than at the first time；Wherein, the first time is that the route is protected Time needed for the I sections of progress analytical calculations of distance protection for the route that shield equipment accesses the compensator and the distance protection The sum of I sections protection act delay time；
Alternatively, first preset time threshold is less than the difference of the first time and the response time of quick by-pass switch Value.
A kind of line protective device, the line protective device include: the first receiving unit, the 5th processing unit and update Unit；Wherein:
First receiving unit, first for receiving compensator transmission executes instruction；
5th processing unit is executed instruction for responding described first, obtains the distance of the route of compensator access Protection impedance definite value is simultaneously set as the first impedance；
The updating unit updates the route of compensator access for being based on first impedance and the first preset rules Distance protection impedance definite value；
First receiving unit is executed instruction for receiving the compensator is sent second；
5th processing unit is executed instruction for responding described second, the route that the compensator is accessed away from First impedance is set as from protection impedance definite value.
Optionally, the updating unit includes: first processing module, computing module and update module；Wherein:
The first processing module, the impedance in the line side for being accessed based on the compensator, to series connection inverter Impedance carries out equivalent process, obtains the second impedance；
The computing module, for by the leakage reactance of first impedance, second impedance and the series transformer It is added, obtains third impedance；
The update module is the third for updating the distance protection impedance definite value of route of the compensator access Impedance.
A kind of line protective device, the line protective device include: the second receiving unit, the 6th processing unit and setting Unit；Wherein:
Second receiving unit, the third for receiving compensator transmission execute instruction；
6th processing unit is executed instruction for responding the third, by the leakage of the first impedance and series transformer Reactance is added to obtain the 4th impedance；Wherein, first impedance is the distance protection impedance definite value of the route of compensator access；
The setting unit, the distance protection impedance definite value of the route for accessing the compensator are set as described Four impedances；
Second receiving unit is also used to receive the notification signal that the compensator is sent；
6th processing unit, is also used to respond the notification signal, and the route that the compensator is accessed away from First impedance is set as from protection impedance definite value.
A kind of compensator, the compensator include: detection unit, third comparing unit, the 7th processing unit, the 8th processing Unit and the 5th acquiring unit；Wherein:
The detection unit, when route for accessing when compensator works normally, the route of detection compensator access or The electric current of series connection inverter in compensator obtains the bus of the first electric current and compensator access or the route of compensator access Voltage, obtain first voltage；
The third comparing unit, for the relationship between first electric current and predetermined current threshold；
7th processing unit, if for first electric current be greater than the predetermined current threshold, and first continue when Between be greater than the first preset time threshold, be latched the series connection inverter, trigger the quick bypass in parallel with the series transformer Switch conduction, and it is closed the mechanical bypass switch in parallel with the series transformer；Wherein, first duration is described First electric current is greater than the duration of the predetermined current threshold；
The third comparing unit, the relationship being also used between first voltage described in comparison and the first predetermined voltage threshold；
8th processing unit, if being less than or equal to first predetermined voltage threshold for the first voltage, And second the duration be greater than the second preset time threshold, based on it is described series connection inverter output voltage control described in compensator The voltage of the bus of access is first predetermined voltage threshold, and obtains the electric current of element corresponding with first electric current, Obtain the second electric current；Wherein, second duration is that the first voltage is less than or equal to first predeterminated voltage The duration of threshold value；
7th processing unit, if being also used to second electric current greater than the predetermined current threshold, and third continues Time is greater than first preset time threshold, is latched the series connection inverter, triggers in parallel with the series transformer fast Fast by-pass switch conducting, and it is closed the mechanical bypass switch in parallel with the series transformer；Wherein, the third duration It is the duration that second electric current is greater than the predetermined current threshold；
5th acquiring unit, if it is less than or equal to the predetermined current threshold for second electric current, or If second electric current is greater than the predetermined current threshold and the third duration is less than or equal to described first and presets Time threshold obtains the voltage of route corresponding with the first voltage, obtains second voltage；
8th processing unit, if if being also used to the second voltage greater than first predetermined voltage threshold or institute Second voltage is stated equal to first predetermined voltage threshold, and the effect of the output voltage of the series connection inverter is described in reduction When the voltage of the bus of compensator access is first predetermined voltage threshold, the bus of the compensator access of removing controls Voltage is first predetermined voltage threshold, and executes the series connection change of current in the route or compensator that the acquisition compensator accesses The electric current of device obtains the first electric current.
The method and apparatus that influence of the compensator to route distance protection is reduced provided by the embodiment of the present invention, obtain First electric current of the series connection inverter in the route or compensator of compensator access, obtains the bus or compensator of compensator access After the voltage of the route of access obtains first voltage, it is greater than predetermined current threshold in the first electric current, and the first duration was greater than First preset time threshold exits series connection inverter and series transformer, is less than or equal to the first default electricity in first voltage When threshold value and the second duration being pressed to be greater than the second preset time threshold, the output voltage setting compensator based on series connection inverter The output voltage for accessing bus is the first predetermined voltage threshold, and the electric current for obtaining element corresponding with the first electric current obtains second Electric current is greater than predetermined current threshold in the second electric current and the third duration is greater than the first preset time threshold, exits series connection and change Flow device and series transformer；In this way, in line protective device work, when the series connection inverter for the compensator that electric system uses Or the electric current of the route of compensator access meets preset condition, or the series connection inverter of compensator that uses when electric system or The electric current of the route of compensator access is unsatisfactory for preset condition, when the route that the series connection inverter or compensator of compensator access Voltage meets preset condition, exits series connection inverter and series transformer in compensator, makes connect inverter and series-transformer Device does not work, and influence of the operation characteristic of series connection inverter and series transformer to line protective device is reduced, convenient for control The working condition of series connection inverter and series transformer in compensator, solves protection of the prior art to line protective device The problem of function has an impact, it is ensured that line protective device carries out the performance of distance protection to route, has ensured electric system Safe and stable operation ensure that engineering practicability.
Detailed description of the invention
Fig. 1 is a kind of process of the method for influence of the reduction compensator provided in an embodiment of the present invention to route distance protection Schematic diagram；
Fig. 2 is the stream of the method for influence of another reduction compensator provided in an embodiment of the present invention to route distance protection Journey schematic diagram；
Fig. 3 is the stream of the method for another influence of the reduction compensator to route distance protection provided in an embodiment of the present invention Journey schematic diagram；
Fig. 4 is the stream of the method for another influence of the reduction compensator to route distance protection provided in an embodiment of the present invention Journey schematic diagram；
Fig. 5 be another embodiment of the present invention provides a kind of influence of reduction compensator to route distance protection method Flow diagram；
Fig. 6 is a kind of structural schematic diagram of UPFC provided in an embodiment of the present invention；
Fig. 7 is a kind of circuit equivalent figure of the structural schematic diagram of UPFC provided in an embodiment of the present invention；
Fig. 8 is a kind of structural schematic diagram of compensator provided in an embodiment of the present invention；
Fig. 9 is the structural schematic diagram of another compensator provided in an embodiment of the present invention.
Specific embodiment
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete Site preparation description.
The embodiment of the present invention provides a kind of method of influence of the reduction compensator to route distance protection, referring to Fig.1 shown in, Method includes the following steps:
The electric current for the series connection inverter in route or compensator that step 101, acquisition compensator access, obtains the first electricity Stream.
Wherein, compensator is used to control the electric current of the route of compensator access, and compensator includes Static Synchronous Series compensation Flow controller and convertible static compensator between device, THE UPFC, line.
Specifically, step 101 obtains the electric current of the series connection inverter in the route or compensator of compensator access, the is obtained One electric current can be realized by compensator.The device for reducing influence of the compensator to route distance protection can be compensator, mend Repaying device can be flow controller and convertible static compensator between static synchronous series compensator, THE UPFC, line Etc. equipment.
The present embodiment is the route failure in compensator access, line protective device (such as relay protection device) need pair The route of compensator access carries out implementation when relay protection operation；And when the line work of compensator access, compensator energy The electric current of series connection inverter in enough routes or compensator accessed to compensator, the bus of compensator access or compensator access Route voltage carry out real-time monitoring, can find in time in this way compensator access route whether break down.
The voltage of the route of step 102, the bus for obtaining compensator access or compensator access, obtains first voltage.
Specifically, step 102 obtains the voltage of the bus of compensator access or the route of compensator access, the first electricity is obtained Pressure can be realized by compensator.
Step 103 compares relationship between the first electric current and predetermined current threshold.
Specifically, step 103 compares the relationship between the first electric current and predetermined current threshold can be realized by compensator. Wherein, predetermined current threshold, which can be, carries out actual measurement to the overcurrent that electric system is able to bear and analyzes one obtained Current value, or carry out the current value that theory analysis obtains or the electricity that actual measurement analysis and theory analysis combination obtain Flow valuve.It should be noted that predetermined current threshold can be according to actual use scene change.
If step 104, the first electric current are greater than predetermined current threshold, and the first duration was greater than the first preset time threshold Value exits series connection inverter and series transformer.
Wherein, series transformer is the equipment in compensator, and the first duration was that the first electric current is greater than predetermined current threshold The duration of value.
If specifically, first electric current of step 104 be greater than predetermined current threshold, and the first duration be greater than first it is default when Between threshold value, exit series connection inverter and series transformer can be realized by compensator.First preset time threshold can be pair When electric current in compensator is greater than predetermined current threshold, the duration that can be worked normally measures one that analysis obtains Time value, or carry out the obtained time value of theory analysis, or combine actual measurement and it is theoretical analyzed when Between be worth.
Step 105 compares relationship between first voltage and the first predetermined voltage threshold.
Specifically, step 105 compare the relationship between first voltage and the first predetermined voltage threshold can by compensator Lai It realizes.First predetermined voltage threshold, which can be, carries out a large amount of actual conditions surveys by the minimum voltage being able to bear to electric system The voltage value for measuring and analyzing acquisition is also possible to carry out the voltage value of theory analysis acquisition, can also be that a large amount of actual conditions are surveyed The voltage value that amount and theory analysis obtain can be modified predetermined voltage threshold according to actual use scene.
If step 106, first voltage are less than or equal to the first predetermined voltage threshold, and the second duration was greater than second The voltage of preset time threshold, the bus of the output voltage control compensator access based on series connection inverter is the first predeterminated voltage Threshold value, and the electric current of element corresponding with the first electric current is obtained, obtain the second electric current.
Wherein, the second duration was the duration that first voltage is less than or equal to the first predetermined voltage threshold.
If specifically, step 106 first voltage is less than or equal to the first predetermined voltage threshold, and the second duration is big In the second preset time threshold, the voltage of the bus of the output voltage control compensator access based on series connection inverter is first pre- If voltage threshold, and the electric current of element corresponding with the first electric current is obtained, obtaining the second electric current can be realized by compensator.
It is less than or equal to the first predetermined voltage threshold in first voltage, and the second duration was greater than the second preset time The voltage of threshold value, the bus of the output voltage control compensator access based on series connection inverter is the first predetermined voltage threshold, this Sample can guarantee that the impedance of the bus of compensator access will not be too small.If first voltage is less than predetermined voltage threshold, repeat to select Step 101-107 is executed, in this way when the route of compensator access breaks down again, the series connection that can be exited in compensator is changed Device and series transformer are flowed, the output voltage of setting series connection inverter is the first predeterminated voltage, reduces compensator to route protection The influence of equipment.Second preset time threshold can be the time value analyzed by actual measurement, or be managed By the time value that analysis obtains, or combine actual measurement and the theoretical time value analyzed.
If step 107, the second electric current are greater than predetermined current threshold, and the third duration is greater than the first preset time threshold Value exits series connection inverter and series transformer.
Wherein, the third duration is the duration that the second electric current is greater than predetermined current threshold.
If specifically, second electric current of step 107 be greater than predetermined current threshold, and the third duration be greater than first it is default when Between threshold value, exit series connection inverter and series transformer can be realized by compensator.
It is further it should be noted that, execution sequence between step 103-104 and step 105-107 without successively it Point, step 103-104 can choose with step 105-107 and be performed simultaneously.
The method that influence of the compensator to route distance protection is reduced provided by the embodiment of the present invention obtains compensator and connects First electric current of the series connection inverter in the route or compensator entered obtains the bus of compensator access or the line of compensator access After the voltage on road obtains first voltage, it is greater than predetermined current threshold in the first electric current, and the first duration was greater than first and presets Time threshold exits series connection inverter and series transformer, first voltage be less than or equal to the first predetermined voltage threshold and When second duration was greater than the second preset time threshold, the output voltage setting compensator based on series connection inverter accesses bus Output voltage be the first predetermined voltage threshold, and the electric current for obtaining corresponding with the first electric current element obtains the second electric current, Second electric current is greater than predetermined current threshold and the third duration is greater than the first preset time threshold, exits series connection inverter and string Join transformer；In this way, in line protective device work, when the series connection inverter or compensator of the compensator that electric system uses The electric current of the route of access meets preset condition, or the series connection inverter or compensator of the compensator used when electric system connect The electric current of the route entered is unsatisfactory for preset condition, when the voltage of the route of series connection inverter or the compensator access of compensator meets Preset condition exits series connection inverter and series transformer in compensator, and series connection inverter and series transformer is made not to work, Influence of the operation characteristic of series connection inverter and series transformer to line protective device is reduced, convenient in control compensator The working condition of series connection inverter and series transformer solves the prior art and generates shadow to the defencive function of line protective device Loud problem, it is ensured that line protective device carries out the performance of distance protection to route, has ensured the safety and stability fortune of electric system Row, ensure that engineering practicability.
The embodiment of the present invention provides a kind of method of influence of the reduction compensator to route distance protection, referring to shown in Fig. 2, Method includes the following steps:
Step 201, compensator obtain the electric current of the series connection inverter in the route or compensator of compensator access, obtain the One electric current.
Wherein, compensator is used to control the electric current of the route of compensator access, and compensator includes Static Synchronous Series compensation Flow controller and convertible static compensator between device, THE UPFC, line
Specifically, the electric current that compensator obtains can be alternating current, the voltage of acquisition can be alternating voltage.With compensation Device is UPFC, the electric current of acquisition be the series connection inverter in UPFC alternating current for be illustrated, when the electricity of UPFC control When force transmission system works normally perhaps failure when available UPFC in series connection inverter alternating current or compensator The alternating current of the route of access obtains the first electric current.
Step 202, compensator obtain the voltage of the bus of compensator access or the route of compensator access, obtain the first electricity Pressure.
Specifically, being illustrated so that the voltage that compensator obtains is the alternating voltage of the bus of UPFC access as an example, obtain The alternating voltage of the bus of UPFC access is that first voltage is analyzed.
Step 203, compensator compare the relationship between the first electric current and predetermined current threshold.
Specifically, the corresponding predetermined current threshold of alternating current of series connection inverter and exchanging for the route that accesses of compensator The corresponding predetermined current threshold of electric current may be the same or different, and can be determined according to actual use scene.When UPFC is controlled Electric system break down when, compensator compare in UPFC series connection inverter electric current and predetermined current threshold between it is big Small relationship.
If step 204, the first electric current are greater than predetermined current threshold, and the first duration was greater than the first preset time threshold Value, compensator locking series connection inverter, and trigger and be connected with the quick by-pass switch of series transformer parallel connection.
Wherein, series transformer is the equipment in compensator, and the first duration was that the first electric current is greater than predetermined current threshold The duration of value；First preset time threshold is less than at the first time, when being line protective device work at the first time, compensator On I of the distance protection times and distance protection I sections of delay time carried out needed for influencing to reduce of the route of compensator access The sum of；Alternatively, the first preset time threshold is less than the difference with the response time of quick by-pass switch at the first time.
Specifically, the alternating current of the series connection inverter in UPFC is greater than predetermined current threshold, and the first duration When greater than the first preset time threshold, compensator locking series connection inverter, and trigger the quick bypass in parallel with series transformer Switch conduction can be realized the function of overcurrent protection.
Step 205, compensator are closed the mechanical bypass switch in parallel with series transformer.
Specifically, if the alternating current of the series connection inverter in UPFC is greater than predetermined current threshold, and the series connection in UPFC The duration that the alternating current of inverter is greater than predetermined current threshold is greater than the first preset time threshold, compensator locking series connection Inverter, and trigger and be connected with the quick by-pass switch of series transformer parallel connection, compensator is closed mechanical bypass switch, also can Realize the function of overcurrent protection.
Step 206, when preset time arrive when, compensator obtain compensator access route electric current and voltage.
Specifically, preset time can be a period, be also possible to a time point, can according to the actual situation in Line protective device, which is executed, with it carries out route protection function corresponding protection act required time or theory analysis obtains Time value is set, such as can be 5 minutes etc.；After the series connection inverter and series transformer exited in UPFC, When preset time arrives, the alternating current and alternating voltage of the route of the compensator access in UPFC are obtained, wherein preset time The actually required time can be debugged according to user to set.
If the electric current of the route of step 207, compensator access is within the scope of predetermined current, and the route of compensator access For voltage in predetermined voltage range, compensator enables series connection inverter and series transformer.
Specifically, predeterminated voltage can be the voltage value analyzed by actual measurement, or carry out theoretical point Obtained voltage value is analysed, or combines actual measurement and the theoretical voltage value analyzed.Enabling series connection inverter can To be realized by unlock series connection inverter, enabling series transformer can be other by disconnecting the machinery in parallel with series transformer Way switch realizes that in practical engineering applications, after mechanical bypass switch closure, the quick by-pass switch of conducting can close automatically Lock.
Step 208, compensator compare the relationship between first voltage and the first predetermined voltage threshold.
Specifically, line attachment in corresponding first predetermined voltage threshold of alternating voltage and UPFC of the bus of UPFC access Corresponding first predetermined voltage threshold of alternating voltage may be the same or different, specifically can according to actual use situation It determines.
If step 209, first voltage are less than or equal to the first predetermined voltage threshold, and the second duration was greater than second The voltage of preset time threshold, the bus of the output voltage control compensator access based on series connection inverter is the first predeterminated voltage Threshold value, and the electric current of element corresponding with the first electric current is obtained, obtain the second electric current.
Wherein, the second duration was the duration that first voltage is less than or equal to the first predetermined voltage threshold.
Specifically, if first voltage is greater than the first predetermined voltage threshold or first voltage is less than or equal to first in advance If voltage threshold and the second duration are less than or equal to the second preset time threshold, compensator repeats step 201- 222, in this way when the route of compensator access breaks down again, the series connection inverter and series connection that can be exited in compensator become Depressor, and when preset time arrives, series connection inverter and the series transformer in compensator are reactivated, compensator is connect The trend of the route entered is controlled.
Wherein, if step 209 first voltage is less than or equal to the first predetermined voltage threshold, and the second duration was greater than The output voltage of second preset time threshold, compensator setting series connection inverter is the first predeterminated voltage, and is obtained and the first electricity The electric current for flowing corresponding element after obtaining the second electric current, can choose and execute step 210~213 or step 214~222；If Second electric current be greater than predetermined current threshold, and the third duration be greater than the first preset time threshold selection execute step 210~ 213, if the second electric current is less than or equal to predetermined current threshold, if the second electric current is greater than predetermined current threshold and third is held The continuous time is less than or equal to the selection of the first preset time threshold and executes step 214~222；
If step 210, the second electric current are greater than predetermined current threshold, and the third duration is greater than the first preset time threshold Value, compensator locking series connection inverter, and trigger and be connected with the quick by-pass switch of series transformer parallel connection.
Wherein, the third duration is the duration that the second electric current is greater than predetermined current threshold.
Step 211, compensator are closed the mechanical bypass switch in parallel with series transformer.
The series transformer is set to exit work specifically, compensator is closed the mechanical bypass switch in parallel with series transformer Make.
Step 212, when preset time arrive when, compensator obtain compensator access route electric current and voltage.
If the electric current of the route of step 213, compensator access is within the scope of predetermined current, and the route of compensator access For voltage in predetermined voltage range, compensator enables series connection inverter and series transformer.
If step 214, the second electric current be less than or equal to predetermined current threshold, if the second electric current be greater than predetermined current Threshold value and third duration are less than or equal to the first preset time threshold, and compensator obtains route corresponding with first voltage Voltage, obtain second voltage.
If step 215, connect inverter output voltage be series connection inverter voltage rating, and second voltage be less than or Person is equal to the first predetermined voltage threshold, and the output voltage of compensator holding series connection inverter is the voltage rating of series connection inverter.
Specifically, the voltage rating of series connection inverter can be obtained from the specification or nameplate of series connection inverter.Show Example property, it is assumed that the voltage rating for inverter of connecting is 190V, and the second voltage of acquisition is 190V, and the first predetermined voltage threshold is 200V, then when the output voltage of series connection inverter is its voltage rating 190V, and second voltage 190V is less than the first predeterminated voltage Threshold value 200V, keeping the output voltage of series connection inverter at this time is device voltage rating 190V.
Step 216, compensator compare the relationship between second voltage and the first predetermined voltage threshold.
If step 217, second voltage are greater than the first predetermined voltage threshold or if second voltage is equal to the first predeterminated voltage Threshold value, and the effect of the output voltage for inverter of connecting is that reduce the voltage of bus of compensator access be the first predeterminated voltage threshold When value, the remove controls voltage of bus of compensator access of compensator is the first predetermined voltage threshold, and executes acquisition compensator The electric current of the route of access or the series connection inverter in compensator, obtains the first electric current.
Specifically, if second voltage less than the first predetermined voltage threshold, keeps the output electricity of the series connection inverter in UPFC Pressure is the first predetermined voltage threshold.Compensator remove controls compensator access bus voltage be the first predetermined voltage threshold, If being equal to the first predetermined voltage threshold when if second voltage is greater than the first predetermined voltage threshold or second voltage, and series connection is changed When the effect for flowing the output voltage of device is that reduce the voltage of bus of compensator access be the first predetermined voltage threshold, no longer to benefit The voltage for repaying the bus of device access is controlled, and the bus for accessing compensator exports the voltage that should currently export.
Based on the above embodiment, step 216 compensator compares the relationship between second voltage and the first predetermined voltage threshold Afterwards, following steps can also be performed:
Wherein, it after step 216 compensator compares the relationship between second voltage and the first predetermined voltage threshold, can choose Execute step 218-220 or step 221-222, if second voltage less than the second predetermined voltage threshold, and the 4th duration It selects to execute step 218-220 more than or equal to third preset time threshold, if second voltage is greater than the second predeterminated voltage threshold Value, if second voltage is less than or equal to the second predetermined voltage threshold and the 4th duration was less than third preset time threshold Value selection executes step 221-222；
If step 218, second voltage are less than the second predetermined voltage threshold, and the 4th duration was more than or equal to third The output voltage of preset time threshold, compensator setting series connection inverter is zero, obtains the electricity of route corresponding with first voltage Pressure, obtains tertiary voltage.
Wherein, the 4th duration was the duration that second voltage is less than or equal to the second predetermined voltage threshold.
Specifically, and the 4th duration was more than or equal to third if second voltage is less than the second predetermined voltage threshold The output voltage of preset time threshold, UPFC setting series connection inverter is zero, determines that the series connection in UPFC is changed by obtaining in this way Device is flowed to the influence factor of line protective device.
If step 219, tertiary voltage are greater than the second predetermined voltage threshold, and the 5th duration was more than or equal to third Preset time threshold, the output voltage that compensator cancels setting series connection inverter is zero, and obtains line corresponding with first voltage The voltage on road obtains the 4th voltage.
Wherein, the 5th duration was the duration that tertiary voltage is greater than the second predetermined voltage threshold.
Specifically, if tertiary voltage be less than or equal to the second predetermined voltage threshold, if tertiary voltage be greater than second Predetermined voltage threshold and the second duration are less than third preset time threshold, and the output voltage of holding series connection inverter is zero.
If if step 220, the 4th voltage are greater than the first predetermined voltage threshold or the 4th voltage is equal to the first predeterminated voltage Threshold value, and the effect of the output voltage for inverter of connecting is that reduce the voltage of bus of compensator access be the first predeterminated voltage threshold When value, the remove controls voltage of bus of compensator access of compensator is the first predetermined voltage threshold, and executes acquisition compensator The electric current of the route of access or the series connection inverter in compensator, obtains the first electric current.
If step 221, second voltage be greater than the second predetermined voltage threshold, if second voltage be less than or equal to second Predetermined voltage threshold and the 4th duration are less than third preset time threshold, and compensator obtains route corresponding with first voltage Voltage, obtain the 5th voltage.
If step 222, the 5th voltage be greater than the first predetermined voltage threshold, if the 5th voltage be equal to the first predeterminated voltage Threshold value, and the effect of the output voltage for inverter of connecting is that reduce the voltage of bus of compensator access be the first predeterminated voltage threshold When value, the remove controls voltage of bus of compensator access of compensator is the first predetermined voltage threshold, and executes acquisition compensator The electric current of the route of access or the series connection inverter in compensator, obtains the first electric current.
It should be noted that the explanation in the present embodiment with same steps in other embodiments or concept, is referred to Description in other embodiments, details are not described herein again.
The method that influence of the compensator to route distance protection is reduced provided by the embodiment of the present invention obtains compensator and connects First electric current of the series connection inverter in the route or compensator entered obtains the bus of compensator access or the line of compensator access After the voltage on road obtains first voltage, it is greater than predetermined current threshold in the first electric current, and the first duration was greater than first and presets Time threshold exits series connection inverter and series transformer, first voltage be less than or equal to the first predetermined voltage threshold and When second duration was greater than the second preset time threshold, the output voltage setting compensator based on series connection inverter accesses bus Output voltage be the first predetermined voltage threshold, and the electric current for obtaining corresponding with the first electric current element obtains the second electric current, Second electric current is greater than predetermined current threshold and the third duration is greater than the first preset time threshold, exits series connection inverter and string Join transformer；In this way, in line protective device work, when the series connection inverter or compensator of the compensator that electric system uses The electric current of the route of access meets preset condition, or the series connection inverter or compensator of the compensator used when electric system connect The electric current of the route entered is unsatisfactory for preset condition, when the voltage of the route of series connection inverter or the compensator access of compensator meets Preset condition exits series connection inverter and series transformer in compensator, and series connection inverter and series transformer is made not to work, Influence of the operation characteristic of series connection inverter and series transformer to line protective device is reduced, convenient in control compensator The working condition of series connection inverter and series transformer solves the prior art and generates shadow to the defencive function of line protective device Loud problem, it is ensured that line protective device carries out the performance of distance protection to route, has ensured the safety and stability fortune of electric system Row, ensure that engineering practicability.
The embodiment of the present invention provides a kind of method of influence of the reduction compensator to route distance protection, referring to shown in Fig. 3, Method includes the following steps:
Step 301, compensator obtain the electric current of the series connection inverter in the route or compensator of compensator access, obtain the One electric current.
Wherein, compensator is used to control the electric current of the route of compensator access, and compensator includes Static Synchronous Series compensation Flow controller and convertible static compensator between device, THE UPFC, line.Compensator is reduced to route distance protection The device of influence can be compensator.
Step 302, compensator obtain the voltage of the bus of compensator access or the route of compensator access, obtain the first electricity Pressure.
It should be noted that the execution sequence between step 301 and step 302 is without successive point, step 301 and step 302 may be performed simultaneously.
Step 303, compensator compare the relationship between the first electric current and predetermined current threshold.
If step 304, the first electric current are greater than predetermined current threshold, and the first duration was greater than the first preset time threshold Value, compensator locking series connection inverter, and trigger and be connected with the quick by-pass switch of series transformer parallel connection.
Wherein, the first preset time threshold is less than first time, is the line of circuit compensation device access to be protected at the first time The time of I sections of distance protection of the adaptive setting on road and distance protection I sections of the sum of delay time；Alternatively, the first preset time Threshold value is less than the difference with the response time of quick by-pass switch at the first time.
Step 305, compensator send third and execute instruction to line protective device.
Wherein, third, which executes instruction, is used to indicate the line that line protective device accesses compensator according to the second preset rules The distance protection impedance definite value on road is updated.
Specifically, the device for reducing influence of the compensator to route distance protection can be line protective device, route is protected Shield equipment can be the protection equipment such as relay protection device.It can establish communication process between compensator and line protective device, After exiting series transformer and series connection inverter, sends third and execute instruction to line protective device, announcement trunk protection is set The distance protection line resistance definite value of the standby route for updating compensator access, and execute corresponding protection operation.Wherein, third is held Row instruction can be after triggering is connected with the quick by-pass switch of series transformer parallel connection, and mechanical bypass switch is sent to before being closed Line protective device.
Step 306, line protective device receive the third that compensator is sent and execute instruction.
Step 307, line protective device response third execute instruction, by the leakage reactance phase of the first impedance and series transformer Add to obtain the 4th impedance.
Wherein, the first impedance is the distance protection impedance definite value of the route of compensator access.
Specifically, the leakage reactance of series transformer can be obtained from the specification or nameplate of series transformer.
The distance protection impedance definite value for the route that compensator accesses is set the 4th resistance by step 308, line protective device It is anti-.
Step 309, compensator since send third execute instruction after timing, be spaced preset time period after, obtain compensation The electric current and voltage of the route of device access.
If the electric current of the route of step 310, compensator access is within the scope of predetermined current, and the route of compensator access For voltage in predetermined voltage range, compensator enables series connection inverter and series transformer.
Step 311, compensator are closed the mechanical bypass switch in parallel with series transformer.
Wherein, there is time delay due to being closed the mechanical bypass switch in parallel with series transformer, step 311 is mended Repaying device and being closed the mechanical bypass switch in parallel with series transformer can be performed simultaneously with step 304, and step 305 is and change of connecting What the mechanical bypass switch of depressor parallel connection executed when being also closed not successfully.
Step 312, after mechanical bypass switch closure in parallel with series transformer, compensator sends notification signal to line Protect equipment in road.
Wherein, notification signal is fixed for the distance protection impedance of the route of announcement trunk protection equipment restoration and compensation device access Value before distance protection impedance definite value of the value to update the route of compensator access.
It should be noted that the operation order between step 309-310 and step 312 does not have successive point, step 309-310 It can execute, or can be operated simultaneously with step 312 after step 312, specific implementation procedure can be according to reality The application scenarios on border determine.
Step 313, line protective device receive the notification signal that compensator is sent.
Step 314, line protective device respond notification signal, and the distance protection impedance of the route of compensator access is determined Value is set as the first impedance.
Step 315, compensator compare the relationship between first voltage and the first predetermined voltage threshold.
If step 316, first voltage are less than or equal to the first predetermined voltage threshold, and the second duration was greater than second The voltage of preset time threshold, the bus of output voltage control compensator access of the compensator based on series connection inverter is first pre- If voltage threshold, and the electric current of element corresponding with the first electric current is obtained, obtain the second electric current.
Wherein, the second duration was the duration that first voltage is less than or equal to the first predetermined voltage threshold.
It should be noted that if step 316 first voltage be less than or equal to the first predetermined voltage threshold, and second continue when Between be greater than the second preset time threshold, compensator based on series connection inverter output voltage control compensator access bus electricity Pressure is the first predetermined voltage threshold, and obtains the electric current of element corresponding with the first electric current, is obtained in the second electric current, implicit to include The step of being compared to the second electric current with predetermined current threshold, step 316 post-compensators, which can choose, executes step 317 and step Rapid 305-314, or can choose and execute step 318-335；If the second electric current be greater than predetermined current threshold, and third continue when Between be greater than the first preset time threshold selection execute step 317 after, continue to execute step 305-314；If the second electric current be less than or Person is equal to predetermined current threshold, if the second electric current be greater than predetermined current threshold and third duration and be less than or equal to the The selection of one preset time threshold executes step 318-335；
If step 317, the second electric current are greater than predetermined current threshold, and the third duration is greater than the first preset time threshold Value, compensator locking series connection inverter, and trigger and be connected with the quick by-pass switch of series transformer parallel connection.
Wherein, the third duration is the duration that the second electric current is greater than predetermined current threshold.
If step 318, the second electric current be less than or equal to predetermined current threshold, if the second electric current be greater than predetermined current Threshold value and third duration are less than or equal to the first preset time threshold, and compensator obtains route corresponding with first voltage Voltage, obtain second voltage.
It should be noted that after the voltage that step 318 compensator obtains route corresponding with first voltage obtains second voltage, It can choose and execute step 319-321, as shown in Figure 3；Also it can choose and execute step 322-327, as shown in Figure 4；
If step 319, connect inverter output voltage be series connection inverter voltage rating, and second voltage be less than or Person is equal to the first predetermined voltage threshold, and the output voltage of compensator holding series connection inverter is the voltage rating of series connection inverter.
Step 320, compensator compare the relationship between second voltage and the first predetermined voltage threshold.
Wherein, it after step 320 compensator compares the relationship between second voltage and the first predetermined voltage threshold, can choose Step 321 is executed, perhaps can choose execution step 322-324 or step 325-335 can be executed；
If step 321, second voltage are greater than the first predetermined voltage threshold or if second voltage is equal to the first predeterminated voltage Threshold value, and the effect of the output voltage for inverter of connecting is that reduce the voltage of bus of compensator access be the first predeterminated voltage threshold When value, the remove controls voltage of bus of compensator access of compensator is the first predetermined voltage threshold, and executes acquisition compensator The electric current of the route of access or the series connection inverter in compensator, obtains the first electric current.
Specifically, when if second voltage is greater than the first predetermined voltage threshold or second voltage equal to the first predeterminated voltage threshold Value, and the effect of the output voltage for inverter of connecting is that reduce the voltage of bus of compensator access be the first predetermined voltage threshold When, compensator remove controls compensator access bus voltage be the first predetermined voltage threshold after, continue to execute step 301.
Step 322, compensator compare the relationship between second voltage and the second predetermined voltage threshold.
If step 323, second voltage are less than the second predetermined voltage threshold, and the 4th duration was more than or equal to third The output voltage of preset time threshold, compensator setting series connection inverter is zero, obtains the electricity of route corresponding with first voltage Pressure, obtains tertiary voltage.
Wherein, the 4th duration was the duration that second voltage is less than or equal to the second predetermined voltage threshold.
If step 324, tertiary voltage are greater than the second predetermined voltage threshold, and the 5th duration was more than or equal to third Preset time threshold, the output voltage that compensator cancels setting series connection inverter is zero, and obtains line corresponding with first voltage The voltage on road obtains the 4th voltage.
Wherein, the 5th duration was the duration that tertiary voltage is greater than the second predetermined voltage threshold.
If if step 325, the 4th voltage are greater than the first predetermined voltage threshold or the 4th voltage is equal to the first predeterminated voltage Threshold value, and the effect of the output voltage for inverter of connecting is that reduce the voltage of bus of compensator access be the first predeterminated voltage threshold When value, the remove controls voltage of bus of compensator access of compensator is the first predetermined voltage threshold, and executes acquisition compensator The electric current of the route of access or the series connection inverter in compensator, obtains the first electric current.
If step 326, second voltage be greater than the second predetermined voltage threshold, if second voltage be less than or equal to second Predetermined voltage threshold and the 4th duration are less than third preset time threshold, and compensator obtains route corresponding with first voltage Voltage, obtain the 5th voltage.
If step 327, the 5th voltage be greater than the first predetermined voltage threshold, if the 5th voltage be equal to the first predeterminated voltage Threshold value, and the effect of the output voltage for inverter of connecting is that reduce the voltage of bus of compensator access be the first predeterminated voltage threshold When value, the remove controls voltage of bus of compensator access of compensator is the first predetermined voltage threshold, and executes acquisition compensator The electric current of the route of access or the series connection inverter in compensator, obtains the first electric current.
Specifically, if the 5th voltage be greater than the first predetermined voltage threshold, if the 5th voltage be equal to the first predeterminated voltage Threshold value, and the effect of the output voltage for inverter of connecting is that reduce the voltage of bus of compensator access be the first predeterminated voltage threshold When value, compensator remove controls compensator access bus voltage be the first predetermined voltage threshold after, execute step 301.
Step 328, when the second electric current be less than or equal to predetermined current threshold, if the second electric current be greater than predetermined current When threshold value and third duration are less than or equal to the first preset time threshold, compensator sends first and executes instruction to route Protect equipment.
Wherein, line protective device be used for protect compensator access route, first execute instruction be used to indicate route guarantor Shield equipment is updated according to distance protection impedance definite value of first preset rules to the route that compensator accesses.
Specifically, the execution sequence between step 328 and step 318 is without successive point, step 328 can be with step 318 are performed simultaneously.
Step 329, line protective device receive compensator is sent first and execute instruction.
Step 330, line protective device response first execute instruction, and obtain the distance protection resistance of the route of compensator access Anti- definite value is simultaneously set as the first impedance.
Step 331, line protective device are based on the first impedance and the first preset rules, update the route of compensator access Distance protection impedance definite value.
Wherein, step 331 line protective device is based on the first impedance and the first preset rules, updates the line of compensator access The distance protection impedance definite value on road, can be realized by following steps:
The impedance in the line side that line protective device is accessed based on compensator carries out equivalent place to the impedance of series connection inverter Reason, obtains the second impedance.
First impedance, the second impedance are added by line protective device with the leakage reactance of series transformer, obtain third impedance.
The distance protection impedance definite value that line protective device updates the route of compensator access is third impedance.
Step 332, compensator after transmission first executes instruction timing, be spaced preset time period after, obtain second Voltage.
Specifically, preset time period can be a time cycle, such as can be 1 minute；When compensator receives sound After 1 minute should be instructed, start the alternating current and alternating voltage that obtain the route of compensator access.
Step 333, when second voltage be greater than the second predetermined voltage threshold, and the 6th duration be greater than third preset time When threshold value, compensator sends second and executes instruction to line protective device.
Wherein, the 6th duration was the duration that second voltage is greater than the second predetermined voltage threshold, and the second execution refers to The distance protection impedance definite value for the route for being used to indicate the access of line protective device restoration and compensation device is enabled to update compensator access Route distance protection impedance definite value before value.
Step 334, line protective device receive compensator is sent second and execute instruction.
Step 335, line protective device response second execute instruction, by the distance protection impedance of the route of compensator access Definite value is set as the first impedance.
It should be noted that the execution sequence between step 316-325 and step 326-335 is without successive point, step 316-325 may be performed simultaneously with step 326-335；
Further it should be noted that, the execution sequence between step 303-314 and step 315-335 is divided without successive, Step 303-314 may be performed simultaneously with step 315-335.
Based on Fig. 3 and embodiment shown in Fig. 4, the present invention also provides a kind of reduction compensators to the shadow of route distance protection Loud method executes corresponding operation, with line as shown in figure 5, compensator exists independently of line protective device in the method There is no information interactive process between road protection equipment, method includes the following steps:
Step 401, compensator obtain the electric current of the series connection inverter in the route or compensator of compensator access, obtain the One electric current.
Wherein, compensator is used to control the electric current of the route of compensator access, and compensator includes Static Synchronous Series compensation Flow controller and convertible static compensator between device, THE UPFC, line.
Step 402, compensator obtain the voltage of the bus of compensator access or the route of compensator access, obtain the first electricity Pressure.
It should be noted that the execution sequence between step 401 and step 402 is without successive point, step 401 and step 402 may be performed simultaneously；Execution sequence between step 403~405 and step 406~415 is without successive point, step 403 ~405 and step 406~415 may be performed simultaneously；
If step 403, the first electric current are greater than predetermined current threshold and the first duration was greater than the first preset time threshold, Compensator locking series connection inverter, and trigger and be connected with the quick by-pass switch of series transformer parallel connection, closure and series-transformer The mechanical bypass switch of device parallel connection.
Wherein, the first preset time threshold is less than first time, is the line of circuit compensation device access to be protected at the first time The time of I sections of distance protection of the adaptive setting on road and distance protection I sections of the sum of delay time；Alternatively, the first preset time Threshold value is less than the difference with the response time of quick by-pass switch at the first time.
After step 404, interval preset time period, compensator obtains the electric current and voltage of the route of compensator access.
If the electric current of the route of step 405, compensator access is within the scope of predetermined current, and the route of compensator access For voltage in predetermined voltage range, compensator enables series connection inverter and series transformer.
If step 406, first voltage are less than or equal to the first predetermined voltage threshold, and the second duration was greater than second The voltage of preset time threshold, the bus of output voltage control compensator access of the compensator based on series connection inverter is first pre- If voltage threshold, and the electric current of element corresponding with the first electric current is obtained, obtain the second electric current.
Wherein, the second duration was the duration that first voltage is less than or equal to the first predetermined voltage threshold.
Specifically, can choose after executing step 406 and execute step 407 or step 408~415, if the second electric current Greater than predetermined current threshold, and the third duration is greater than the selection of the first preset time threshold and executes step 407, if the second electric current Less than or equal to predetermined current threshold, if the second electric current be greater than predetermined current threshold and third duration be less than or It selects to execute step 408~415 equal to the first preset time threshold；
If step 407, the second electric current are greater than predetermined current threshold, and the third duration is greater than the first preset time threshold It is worth, compensator locking series connection inverter, and triggers and be connected with the quick by-pass switch of series transformer parallel connection, is closed and change of connecting The mechanical bypass switch of depressor parallel connection.
Wherein, the third duration is the duration that the second electric current is greater than predetermined current threshold.
If step 408, the second electric current be less than or equal to predetermined current threshold, if the second electric current be greater than predetermined current Threshold value and third duration are less than or equal to the first preset time threshold, and compensator obtains route corresponding with first voltage Voltage, obtain second voltage.
Wherein, execute step 408 after, can choose execute step 409~410, also can choose execute step 411~ 415；
If step 409, connect inverter output voltage be series connection inverter voltage rating, and second voltage be less than or Person is equal to the first predetermined voltage threshold, and the output voltage of compensator holding series connection inverter is the voltage rating of series connection inverter.
If step 410, second voltage are greater than the first predetermined voltage threshold or if second voltage is equal to the first predeterminated voltage Threshold value, and the effect of the output voltage for inverter of connecting is that reduce the voltage of bus of compensator access be the first predeterminated voltage threshold When value, the remove controls voltage of bus of compensator access of compensator is the first predetermined voltage threshold, and executes acquisition compensator The electric current of the route of access or the series connection inverter in compensator, obtains the first electric current.
Wherein, after compensator executes step 410, it can choose and execute step 411~413, also can choose and execute step Rapid 414~415；If second voltage is less than the second predetermined voltage threshold, and the 4th duration is default more than or equal to third Time threshold, which can choose, executes step 411~413, if second voltage is greater than the second predetermined voltage threshold, if the second electricity Pressure is less than or equal to the second predetermined voltage threshold and the 4th duration was less than third preset time threshold and can choose execution Step 414~415；
If step 411, second voltage are less than the second predetermined voltage threshold, and the 4th duration was more than or equal to third The output voltage of preset time threshold, compensator setting series connection inverter is zero, obtains the electricity of route corresponding with first voltage Pressure, obtains tertiary voltage.
Wherein, the 4th duration was the duration that second voltage is less than or equal to the second predetermined voltage threshold.
If step 412, tertiary voltage are greater than the second predetermined voltage threshold, and the 5th duration was more than or equal to third Preset time threshold, the output voltage that compensator cancels setting series connection inverter is zero, and obtains line corresponding with first voltage The voltage on road obtains the 4th voltage.
Wherein, the 5th duration was the duration that tertiary voltage is greater than the second predetermined voltage threshold.
If if step 413, the 4th voltage are greater than the first predetermined voltage threshold or the 4th voltage is equal to the first predeterminated voltage Threshold value, and the effect of the output voltage for inverter of connecting is that reduce the voltage of bus of compensator access be the first predeterminated voltage threshold When value, the remove controls voltage of bus of compensator access of compensator is the first predetermined voltage threshold, and executes acquisition compensator The electric current of the route of access or the series connection inverter in compensator, obtains the first electric current.
If step 414, second voltage be greater than the second predetermined voltage threshold, if second voltage be less than or equal to second Predetermined voltage threshold and the 4th duration are less than third preset time threshold, and compensator obtains route corresponding with first voltage Voltage, obtain the 5th voltage.
If step 415, the 5th voltage be greater than the first predetermined voltage threshold, if the 5th voltage be equal to the first predeterminated voltage Threshold value, and the effect of the output voltage for inverter of connecting is that reduce the voltage of bus of compensator access be the first predeterminated voltage threshold When value, the remove controls voltage of bus of compensator access of compensator is the first predetermined voltage threshold, and executes acquisition compensator The electric current of the route of access or the series connection inverter in compensator, obtains the first electric current.
The circuit connecting mode of the UPFC used in embodiments of the present invention a kind of can be as shown in Figure 6, the UPFC's Circuit may include: current transformer 53, the Quick side of series connection inverter 51, series transformer 52, inverter output end of connecting Way switch 54, compensator access bus 55, bus-bar potential transformer 56, series transformer output end voltage transformer 57 With the current transformer 58, mechanical bypass switch 59, parallel inverter 510 of series transformer output end.The corresponding UPFC of Fig. 6 The equivalent circuit diagram of circuit can be as shown in Figure 7, wherein further include in the corresponding circuit structure of Fig. 7 in Fig. 6 it is unshowned simultaneously Join the current transformer 511 of inverter outlet side and the voltage transformer 512 of parallel inverter outlet side.Specifically, series connection is changed The current transformer 53 of stream device output end is used to obtain the electric current of series connection inverter, and bus-bar potential transformer 56 is for obtaining compensation The voltage of the bus 55 of device access, the voltage transformer 57 of series transformer output end are used to obtain the route of compensator access Voltage, the current transformer 58 of series transformer output end is used to obtain the electric current of the route of compensator access, and parallel connection is changed The current transformer 511 of stream device outlet side is used to obtain the electric current of parallel inverter, the mutual induction of voltage of parallel inverter outlet side Device 512 is used to obtain the voltage of parallel inverter.Quick by-pass switch 54 is in parallel with series transformer 52, is connected to series-transformer Device inputs end side, and mechanical bypass switch 59 is also in parallel with series transformer 52, is connected to series transformer output end, Quick side The connection type of way switch 54 and mechanical bypass switch 59 and series transformer can be as shown in Figure 6.It should be noted that Quick side Way switch 54 is in parallel with series transformer 52, is connected to series transformer output end, i.e., in parallel with mechanical bypass switch 59 to connect Connect the output end (being not shown in Fig. 6) in series transformer 52.
It should be noted that the explanation in the present embodiment with same steps in other embodiments or concept, is referred to Description in other embodiments, details are not described herein again.
The method that influence of the compensator to route distance protection is reduced provided by the embodiment of the present invention obtains compensator and connects First electric current of the series connection inverter in the route or compensator entered obtains the bus of compensator access or the line of compensator access After the voltage on road obtains first voltage, it is greater than predetermined current threshold in the first electric current, and the first duration was greater than first and presets Time threshold exits series connection inverter and series transformer, first voltage be less than or equal to the first predetermined voltage threshold and When second duration was greater than the second preset time threshold, the output voltage setting compensator based on series connection inverter accesses bus Output voltage be the first predetermined voltage threshold, and the electric current for obtaining corresponding with the first electric current element obtains the second electric current, Second electric current is greater than predetermined current threshold and the third duration is greater than the first preset time threshold, exits series connection inverter and string Join transformer；In this way, in line protective device work, when the series connection inverter or compensator of the compensator that electric system uses The electric current of the route of access meets preset condition, or the series connection inverter or compensator of the compensator used when electric system connect The electric current of the route entered is unsatisfactory for preset condition, when the voltage of the route of series connection inverter or the compensator access of compensator meets Preset condition exits series connection inverter and series transformer in compensator, and series connection inverter and series transformer is made not to work, Influence of the operation characteristic of series connection inverter and series transformer to line protective device is reduced, convenient in control compensator The working condition of series connection inverter and series transformer solves the prior art and generates shadow to the defencive function of line protective device Loud problem, it is ensured that line protective device carries out the performance of distance protection to route, has ensured the safety and stability fortune of electric system Row, ensure that engineering practicability.
Based on the above embodiment, the side of the influence the present invention also provides a kind of reduction compensator to route distance protection Method, method includes the following steps:
A, when the route of compensator access works normally, compensator is detected in the route or compensator of compensator access The electric current of series connection inverter, obtains the first electric current, and detects the voltage of the bus of compensator access or the route of compensator access, Obtain first voltage.
B, compensator compares the relationship between the first electric current and predetermined current threshold.
If c, the first electric current is greater than predetermined current threshold, and the first duration was greater than the first preset time threshold, locking Series connection inverter, compensator triggering is connected with the quick by-pass switch of series transformer parallel connection, and is closed with series transformer simultaneously The mechanical bypass switch of connection.
Wherein, the first duration was the duration that the first electric current is greater than predetermined current threshold.
D, compensator compares the relationship between first voltage and the first predetermined voltage threshold.
If e, first voltage be less than or equal to the first predetermined voltage threshold, and the second duration be greater than second it is default when Between threshold value, compensator based on series connection inverter output voltage control compensator access bus voltage be the first predeterminated voltage Threshold value, and the electric current of element corresponding with the first electric current is obtained, obtain the second electric current.
Wherein, the second duration was the duration that first voltage is less than or equal to the first predetermined voltage threshold.
If f, the second electric current is greater than predetermined current threshold, and the third duration is greater than the first preset time threshold, locking Series connection inverter, compensator triggering is connected with the quick by-pass switch of series transformer parallel connection, and is closed with series transformer simultaneously The mechanical bypass switch of connection.
Wherein, the third duration is the duration that the second electric current is greater than predetermined current threshold.
If g, the second electric current be less than or equal to predetermined current threshold, if the second electric current be greater than predetermined current threshold and The third duration is less than or equal to the first preset time threshold, and compensator obtains the electricity of route corresponding with first voltage Pressure, obtains second voltage.
If h, second voltage is greater than the first predetermined voltage threshold or if second voltage is equal to the first predetermined voltage threshold, and When the effect of output voltage of inverter of connecting is that reduce the voltage of bus of compensator access be the first predetermined voltage threshold, mend Repay device remove controls compensator access bus voltage be the first predetermined voltage threshold, and execute obtain compensator access line The electric current of series connection inverter in road or compensator, obtains the first electric current.
The embodiment of the invention provides a kind of compensators 6, can be applied to Fig. 1~3, one kind that 5 corresponding embodiments provide In the method for reducing influence of the compensator to route distance protection, referring to shown in Fig. 8, compensator include: first acquisition unit 61, First comparing unit 62 exits unit 63 and first processing units 64, in which:
First acquisition unit 61, for obtaining the electric current of the series connection inverter in the route or compensator that compensator accesses, Obtain the first electric current.
Wherein, compensator is used to control the electric current of the route of compensator access, and compensator includes Static Synchronous Series compensation Flow controller and convertible static compensator between device, THE UPFC, line.
First acquisition unit 61 is also used to obtain the voltage of the bus of compensator access or the route of compensator access, obtains To first voltage.
First comparing unit 62, for comparing the relationship between the first electric current and predetermined current threshold.
First comparing unit 62, is also used to compare the relationship between first voltage and the first predetermined voltage threshold.
Wherein, the first preset time threshold is less than at the first time；It is that line protective device accesses compensator at the first time I sections of distance protection of route carry out analytical calculations needed for time and distance protection I sections of the sum of protection act delay time； Alternatively, the first preset time threshold is less than the difference with the response time of quick by-pass switch at the first time.
Unit 63 is exited, if being greater than predetermined current threshold for the first electric current, and the first duration was greater than first and presets Time threshold exits series connection inverter and series transformer.
Wherein, series transformer is the equipment in compensator, and the first duration was that the first electric current is greater than predetermined current threshold The duration of value.
First processing units 64, if being less than or equal to the first predetermined voltage threshold for first voltage, and second continues Time is greater than the second preset time threshold, and the voltage of the bus of the output voltage control compensator access based on series connection inverter is First predetermined voltage threshold, and the electric current of element corresponding with the first electric current is obtained, obtain the second electric current.
Wherein, the second duration was the duration that first voltage is less than or equal to the first predetermined voltage threshold.
Unit 63 is exited, if being also used to the second electric current greater than predetermined current threshold, and the third duration is greater than first in advance If time threshold, series connection inverter and series transformer are exited.
Wherein, the third duration is the duration that the second electric current is greater than predetermined current threshold.
Compensator provided by the embodiment of the present invention obtains the series connection change of current in the route or compensator of compensator access First electric current of device, obtain the bus of compensator access or the route of compensator access voltage obtain first voltage after, the One electric current is greater than predetermined current threshold, and the first duration was greater than the first preset time threshold, exits series connection inverter and string Join transformer, is less than or equal to the first predetermined voltage threshold in first voltage and the second duration was greater than the second preset time When threshold value, the output voltage of the output voltage setting compensator access bus based on series connection inverter is the first predeterminated voltage threshold Value, and the electric current for obtaining corresponding with the first electric current element obtains the second electric current, the second electric current greater than predetermined current threshold and The third duration is greater than the first preset time threshold, exits series connection inverter and series transformer；In this way, being set in route protection When standby work, when the electric current of the route of series connection inverter or the compensator access for the compensator that electric system uses meets default item Part, or when electric system use compensator series connection inverter or compensator access route electric current be unsatisfactory for preset item Part exits the string in compensator when the voltage of route that the series connection inverter or compensator of compensator access meets preset condition Join inverter and series transformer, series connection inverter and series transformer is made not to work, reduces series connection inverter and series connection becomes Influence of the operation characteristic of depressor to line protective device, convenient for the series connection inverter and series transformer in control compensator Working condition solves the problems, such as that the prior art has an impact the defencive function of line protective device, it is ensured that route protection is set The standby performance that distance protection is carried out to route, has ensured the safe and stable operation of electric system, ensure that engineering practicability.
Specifically, after first processing units further include: the second comparing unit and the second processing unit, in which:
First acquisition unit, if being also used to the second electric current less than or equal to predetermined current threshold, if the second electric current Greater than predetermined current threshold and the third duration is less than or equal to the first preset time threshold, obtains corresponding with first voltage Route voltage, obtain second voltage.
Second comparing unit, for comparing the relationship between second voltage and the first predetermined voltage threshold.
The second processing unit, if if being greater than the first predetermined voltage threshold or second voltage equal to first for second voltage Predetermined voltage threshold, and the effect of the output voltage for inverter of connecting is that reduce the voltage of the bus of compensator access be first pre- If when voltage threshold, the voltage of the bus of compensator of removing controls access is the first predetermined voltage threshold, and executes acquisition compensation The electric current of series connection inverter in the route or compensator of device access, obtains the first electric current.
Specifically, exiting unit includes: first processing module and Second processing module, in which:
First processing module for being latched series connection inverter, and triggers the quick by-pass switch in parallel with series transformer Conducting.
Second processing module, for being closed the mechanical bypass switch in parallel with series transformer.
Specifically, before the second comparing unit further include: setting unit, in which:
Setting unit, if the output voltage for inverter of connecting is the voltage rating of inverter of connecting, and second voltage Less than or equal to the first predetermined voltage threshold, the output voltage of holding series connection inverter is the voltage rating of series connection inverter.
Specifically, exiting after unit further include: second acquisition unit and first enables unit, in which:
Second acquisition unit, for obtaining the electric current and voltage of the route of compensator access when preset time arrives.
First enables unit, if the electric current of the route for compensator access is within the scope of predetermined current, and compensator is connect The voltage of the route entered enables series connection inverter and series transformer in predetermined voltage range.
Specifically, after first processing units further include: the first transmission unit and third acquiring unit, in which:
First transmission unit, for when the second electric current be less than or equal to predetermined current threshold, if the second electric current it is big In predetermined current threshold and when the third duration is less than or equal to the first preset time threshold, send first execute instruction to Line protective device.
Wherein, line protective device be used for protect compensator access route, first execute instruction be used to indicate route guarantor Shield equipment is updated according to distance protection impedance definite value of first preset rules to the route that compensator accesses.
Third acquiring unit after being spaced preset time period, obtains for timing after transmission first executes instruction Two voltages.
First transmission unit is also used to be greater than the second predetermined voltage threshold when second voltage, and the 6th duration was greater than When third preset time threshold, sends second and execute instruction to line protective device.
Wherein, the 6th duration was the duration that second voltage is greater than the second predetermined voltage threshold, and the second execution refers to The distance protection impedance definite value for the route for being used to indicate the access of line protective device restoration and compensation device is enabled to update compensator access Route distance protection impedance definite value before value.
Specifically, quickly by-pass switch is in parallel with series transformer, mechanical bypass switch is in parallel with series transformer, exits After unit further include: the second transmission unit, the 4th acquiring unit and second enable unit, in which:
Second transmission unit, for sending third and executing instruction to line protective device when mechanical bypass switch disconnects.
Wherein, third, which executes instruction, is used to indicate the line that line protective device accesses compensator according to the second preset rules The distance protection impedance definite value on road is updated.
4th acquiring unit, for when mechanical bypass switch closure when, since send third execute instruction after timing, After preset time period, the electric current and voltage of the route of compensator access are obtained.
Second enables unit, if the electric current of the route for compensator access is within the scope of predetermined current, and compensator is connect The voltage of the route entered enables series connection inverter and series transformer in predetermined voltage range.
Second transmission unit is also used to send notification signal to line protective device.
Wherein, notification signal is fixed for the distance protection impedance of the route of announcement trunk protection equipment restoration and compensation device access Value before distance protection impedance definite value of the value to update the route of compensator access.
Specifically, after first processing units further include: third processing unit and fourth processing unit, in which:
First acquisition unit, if being also used to the second electric current less than or equal to predetermined current threshold, if the second electric current Greater than predetermined current threshold and the third duration is less than or equal to the first preset time threshold, obtains corresponding with first voltage Route voltage, obtain second voltage.
First comparing unit, for comparing the relationship between second voltage and the second predetermined voltage threshold.
Third processing unit, if for second voltage less than the second predetermined voltage threshold, and the 4th duration be greater than or Person is equal to third preset time threshold, and the output voltage of setting series connection inverter is zero, obtains route corresponding with first voltage Voltage, obtain tertiary voltage.
Wherein, the 4th duration was the duration that second voltage is less than or equal to the second predetermined voltage threshold.
Third processing unit, if being also used to tertiary voltage greater than the second predetermined voltage threshold, and the 5th duration was greater than Or it is equal to third preset time threshold, the output voltage for cancelling setting series connection inverter is zero, and is obtained and first voltage pair The voltage for the route answered obtains the 4th voltage.
Wherein, the 5th duration was the duration that tertiary voltage is greater than the second predetermined voltage threshold.
Fourth processing unit, if if being greater than the first predetermined voltage threshold or the 4th voltage equal to first for the 4th voltage Predetermined voltage threshold, and the effect of the output voltage for inverter of connecting is that reduce the voltage of the bus of compensator access be first pre- If when voltage threshold, the voltage of the bus of compensator of removing controls access is the first predetermined voltage threshold, and executes acquisition compensation The electric current of series connection inverter in the route or compensator of device access, obtains the first electric current.
First acquisition unit, if being also used to second voltage greater than the second predetermined voltage threshold, if second voltage be less than Or be equal to the second predetermined voltage threshold and the 4th duration and be less than third preset time threshold, it obtains corresponding with first voltage Route voltage, obtain the 5th voltage.
Fourth processing unit, if being also used to the 5th voltage greater than the first predetermined voltage threshold, if the 5th voltage be equal to First predetermined voltage threshold, and the effect of the output voltage for inverter of connecting is that reduce the voltage of the bus of compensator access be the When one predetermined voltage threshold, the voltage of the bus of compensator of removing controls access is the first predetermined voltage threshold, and executes acquisition The electric current of series connection inverter in the route or compensator of compensator access, obtains the first electric current.
It should be noted that the interactive process in the present embodiment between each unit and module, is referred to Fig. 1~3 pair Interactive process in a kind of method of influence of the reduction compensator that the embodiment answered provides to route distance protection, herein no longer It repeats.
Compensator provided by the embodiment of the present invention obtains the series connection inverter in the route or compensator of compensator access The first electric current, obtain compensator access bus or compensator access route voltage obtain first voltage after, first Electric current is greater than predetermined current threshold, and the first duration was greater than the first preset time threshold, exits series connection inverter and series connection Transformer is less than or equal to the first predetermined voltage threshold in first voltage and the second duration was greater than the second preset time threshold When value, the output voltage of the output voltage setting compensator access bus based on series connection inverter is the first predetermined voltage threshold, And the electric current for obtaining element corresponding with the first electric current obtains the second electric current, is greater than predetermined current threshold and third in the second electric current Duration is greater than the first preset time threshold, exits series connection inverter and series transformer；In this way, in line protective device work When making, when the electric current of route that the series connection inverter or compensator of the compensator that electric system uses access meets preset condition, Or the electric current of route that the series connection inverter or compensator of the compensator used when electric system access is unsatisfactory for preset condition, When the voltage for the route that the series connection inverter or compensator of compensator access meets preset condition, the series connection exited in compensator is changed Device and series transformer are flowed, series connection inverter and series transformer is made not to work, reduces series connection inverter and series transformer Influence of the operation characteristic to line protective device, convenient for the work of series connection inverter and series transformer in control compensator State solves the problems, such as that the prior art has an impact the defencive function of line protective device, it is ensured that line protective device pair Route carries out the performance of distance protection, has ensured the safe and stable operation of electric system, ensure that engineering practicability.
The embodiment of the invention provides a kind of line protective devices 7, can be applied to a kind of reduction provided by the above embodiment In the method for influence of the compensator to route distance protection, referring to shown in Fig. 9, which includes: the first receiving unit the 71, the 5th Processing unit 72 and updating unit 73, in which:
First receiving unit 71, first for receiving compensator transmission executes instruction.
5th processing unit 72 is executed instruction for responding first, obtains the distance protection resistance of the route of compensator access Anti- definite value is simultaneously set as the first impedance.
Updating unit 73 updates the distance of the route of compensator access for being based on the first impedance and the first preset rules Protect impedance definite value.
First receiving unit 71, second for receiving compensator transmission executes instruction.
5th processing unit 72 is executed instruction for responding second, by the distance protection impedance of the route of compensator access Definite value is set as the first impedance.
Based on above-mentioned line protective device, updating unit includes: first processing module, computing module and update module, In:
First processing module, the impedance in the line side for being accessed based on compensator carry out the impedance of series connection inverter Equivalent process obtains the second impedance.
Computing module obtains third resistance for the first impedance, the second impedance to be added with the leakage reactance of series transformer It is anti-.
Update module, the distance protection impedance definite value of the route for updating compensator access are third impedance.
The embodiment of the invention also provides a kind of line protective devices, can be applied to a kind of reduction provided by the above embodiment In the method for influence of the compensator to route distance protection, which includes: the second receiving unit, the 6th processing unit and setting Unit, in which:
Second receiving unit, the third for receiving compensator transmission execute instruction.
6th processing unit is executed instruction for responding third, and the first impedance is added with the leakage reactance of series transformer Obtain the 4th impedance.
The distance protection impedance definite value of setting unit, the route for accessing compensator is set as the 4th impedance.
Second receiving unit is also used to receive the notification signal of compensator transmission.
6th processing unit is also used to respond notification signal, and the distance protection impedance of the route of compensator access is determined Value is set as the first impedance.
The embodiment of the invention also provides a kind of compensators, can be applied to a kind of reduction compensator provided by the above embodiment In the method for influence to route distance protection, the compensator include: detection unit, third comparing unit, the 7th processing unit, 8th processing unit and the 5th acquiring unit, in which:
Detection unit, when the route for accessing when compensator works normally, the route of detection compensator access or compensation The electric current of series connection inverter in device, obtains the first electric current, and detects the bus of compensator access or the route of compensator access Voltage, obtain first voltage.
Third comparing unit, for comparing the relationship between the first electric current and predetermined current threshold.
7th processing unit, if being greater than predetermined current threshold for the first electric current, and the first duration was greater than first in advance If time threshold, locking series connection inverter, triggering is connected with the quick by-pass switch of series transformer parallel connection, and is closed and connects The mechanical bypass switch of transformers connected in parallel.
Wherein, the first duration was the duration that the first electric current is greater than predetermined current threshold.
Third comparing unit is also used to compare the relationship between first voltage and the first predetermined voltage threshold.
8th processing unit, if for first voltage be less than or equal to the first predetermined voltage threshold, and second continue when Between be greater than the second preset time threshold, the voltage of the bus of the output voltage control compensator access based on series connection inverter is the One predetermined voltage threshold, and the electric current of element corresponding with the first electric current is obtained, obtain the second electric current.
Wherein, the second duration was the duration that first voltage is less than or equal to the first predetermined voltage threshold.
7th processing unit, if being also used to the second electric current greater than predetermined current threshold, and the third duration is greater than first Preset time threshold, locking series connection inverter, triggering is connected with the quick by-pass switch of series transformer parallel connection, and is closed and string Join the mechanical bypass switch of transformers connected in parallel.
Wherein, the third duration is the duration that the second electric current is greater than predetermined current threshold.
5th acquiring unit, if for the second electric current be less than or equal to predetermined current threshold, if the second electric current it is big In predetermined current threshold and the third duration is less than or equal to the first preset time threshold, obtains corresponding with first voltage The voltage of route, obtains second voltage.
8th processing unit, if being equal to the greater than the first predetermined voltage threshold or second voltage if being also used to second voltage One predetermined voltage threshold, and the effect of the output voltage for inverter of connecting is that reduce the voltage of bus of compensator access be first When predetermined voltage threshold, the voltage of the bus of compensator of removing controls access is the first predetermined voltage threshold, and executes acquisition and mend The electric current for repaying the series connection inverter in the route or compensator of device access, obtains the first electric current.
In practical applications, first acquisition unit 61, the first comparing unit 62, exit unit 63, first processing units 64, First receiving unit 71, the 5th processing unit 72 and updating unit 73 can be by the centres in wireless data sending device Manage device (Central Processing Unit, CPU), microprocessor (Micro Processor Unit, MPU), digital signal Processor (Digital Signal Processor, DSP) or field programmable gate array (Field Programmable Gate Array, FPGA) etc. realize.
It should be understood by those skilled in the art that, the embodiment of the present invention can provide as method, system or computer program Product.Therefore, the shape of hardware embodiment, software implementation or embodiment combining software and hardware aspects can be used in the present invention Formula.Moreover, the present invention, which can be used, can use storage in the computer that one or more wherein includes computer usable program code The form for the computer program product implemented on medium (including but not limited to magnetic disk storage and optical memory etc.).
The present invention be referring to according to the method for the embodiment of the present invention, the process of equipment (system) and computer program product Figure and/or block diagram describe.It should be understood that every one stream in flowchart and/or the block diagram can be realized by computer program instructions The combination of process and/or box in journey and/or box and flowchart and/or the block diagram.It can provide these computer programs Instruct the processor of general purpose computer, special purpose computer, Embedded Processor or other programmable data processing devices to produce A raw machine, so that being generated by the instruction that computer or the processor of other programmable data processing devices execute for real The device for the function of being specified in present one or more flows of the flowchart and/or one or more blocks of the block diagram.
These computer program instructions, which may also be stored in, is able to guide computer or other programmable data processing devices with spy Determine in the computer-readable memory that mode works, so that it includes referring to that instruction stored in the computer readable memory, which generates, Enable the manufacture of device, the command device realize in one box of one or more flows of the flowchart and/or block diagram or The function of being specified in multiple boxes.
These computer program instructions also can be loaded onto a computer or other programmable data processing device, so that counting Series of operation steps are executed on calculation machine or other programmable devices to generate computer implemented processing, thus in computer or The instruction executed on other programmable devices is provided for realizing in one or more flows of the flowchart and/or block diagram one The step of function of being specified in a box or multiple boxes.
The foregoing is only a preferred embodiment of the present invention, is not intended to limit the scope of the present invention.

Claims (26)

1. a kind of method of influence of reduction compensator to route distance protection, which is characterized in that the described method includes:
The electric current for obtaining the series connection inverter in the route or compensator of compensator access, obtains the first electric current；Wherein, the benefit The electric current of route of the device for controlling compensator access is repaid, the compensator includes static synchronous series compensator, Unified Power Flow Flow controller and convertible static compensator between controller, line；
The voltage for obtaining the bus of the compensator access or the route of compensator access, obtains first voltage；
Compare the relationship between first electric current and predetermined current threshold；
Compare the relationship between the first voltage and the first predetermined voltage threshold；
If first electric current is greater than the predetermined current threshold, and the first duration was greater than the first preset time threshold, moved back The series connection inverter and series transformer out；Wherein, the series transformer is the equipment in the compensator, described first Duration is the duration that first electric current is greater than the predetermined current threshold；
If the first voltage is less than or equal to first predetermined voltage threshold, and the second duration was greater than second and presets The voltage of time threshold, the bus based on the access of compensator described in the output voltage control of inverter of connecting is described first Predetermined voltage threshold, and the electric current of element corresponding with first electric current is obtained, obtain the second electric current；Wherein, described second Duration is the duration that the first voltage is less than or equal to first predetermined voltage threshold；
If second electric current is greater than the predetermined current threshold, and the third duration is greater than the first preset time threshold Value, exits the series connection inverter and the series transformer；Wherein, the third duration is that second electric current is greater than The duration of the predetermined current threshold.
2. the method according to claim 1, wherein the electricity for obtaining element corresponding with first electric current Stream, after obtaining the second electric current, further includes:
If second electric current is less than or equal to the predetermined current threshold, if second electric current be greater than it is described default Current threshold and the third duration are less than or equal to first preset time threshold, acquisition and the first voltage The voltage of corresponding route, obtains second voltage；
Compare the relationship between the second voltage and first predetermined voltage threshold；
If if the second voltage is greater than first predetermined voltage threshold or the second voltage is equal to described first and presets Voltage threshold, and it is institute that the effect of the output voltage of the series connection inverter, which is the voltage of the bus of reduction compensator access, When stating the first predetermined voltage threshold, the voltage of the bus for the compensator access of removing controls is the first predeterminated voltage threshold Value, and the electric current of the series connection inverter in the route or compensator that the acquisition compensator accesses is executed, obtain the first electric current.
3. according to the method described in claim 2, it is characterized in that, the second voltage and the first predeterminated voltage threshold Before relationship between value, further includes:
If it is described series connection inverter output voltage be it is described series connection inverter voltage rating, and the second voltage be less than or Person is equal to first predetermined voltage threshold, and keeping the output voltage of the series connection inverter is the specified of the series connection inverter Voltage.
4. the method according to claim 1, wherein the electricity for obtaining element corresponding with first electric current Stream, after obtaining the second electric current, further includes:
If second electric current is less than or equal to the predetermined current threshold, if second electric current be greater than it is described default Current threshold and the third duration are less than or equal to first preset time threshold, acquisition and the first voltage The voltage of corresponding route, obtains second voltage；
Compare the relationship between the second voltage and the second predetermined voltage threshold；
If the second voltage is less than second predetermined voltage threshold, and the 4th duration is default more than or equal to third Time threshold, the output voltage that the series connection inverter is arranged is zero, obtains the voltage of route corresponding with the first voltage, Obtain tertiary voltage；Wherein, the 4th duration is that the second voltage is less than or equal to second predeterminated voltage The duration of threshold value；
If the tertiary voltage is greater than second predetermined voltage threshold, and the 5th duration was more than or equal to the third Preset time threshold, the output voltage for cancelling the setting series connection inverter is zero, and is obtained corresponding with the first voltage The voltage of route obtains the 4th voltage；Wherein, the 5th duration is that the tertiary voltage is greater than the described second default electricity Press the duration of threshold value；
If if the 4th voltage is greater than first predetermined voltage threshold or the 4th voltage is equal to described first and presets Voltage threshold, and it is institute that the effect of the output voltage of the series connection inverter, which is the voltage of the bus of reduction compensator access, When stating the first predetermined voltage threshold, the voltage of the bus for the compensator access of removing controls is the first predeterminated voltage threshold Value, and the electric current of the series connection inverter in the route or compensator that the acquisition compensator accesses is executed, obtain the first electric current；
If the second voltage is greater than second predetermined voltage threshold, if the second voltage be less than or equal to it is described Second predetermined voltage threshold and the 4th duration are less than the third preset time threshold, acquisition and the first voltage The voltage of corresponding route obtains the 5th voltage；
If the 5th voltage is greater than first predetermined voltage threshold, if the 5th voltage to be equal to described first default Voltage threshold, and it is institute that the effect of the output voltage of the series connection inverter, which is the voltage of the bus of reduction compensator access, When stating the first predetermined voltage threshold, the voltage of the bus for the compensator access of removing controls is the first predeterminated voltage threshold Value, and the electric current of the series connection inverter in the route or compensator that the acquisition compensator accesses is executed, obtain the first electric current.
5. the method according to claim 1, wherein described exit the series connection inverter and the series-transformer Device, comprising:
It is latched the series connection inverter, and triggers and is connected with the quick by-pass switch of the series transformer parallel connection；
It is closed the mechanical bypass switch in parallel with the series transformer.
6. the method according to claim 1, wherein described exit the series connection inverter and the series-transformer After device, further includes:
When preset time arrives, the electric current and voltage of the route of the compensator access are obtained；
If the electric current of the route of the compensator access is within the scope of predetermined current, and the voltage of the route of compensator access In predetermined voltage range, the series connection inverter and the series transformer are enabled.
7. the method according to claim 1, wherein the electricity for obtaining element corresponding with first electric current Stream, after obtaining the second electric current, further includes:
When second electric current is less than or equal to the predetermined current threshold, if second electric current be greater than it is described default When current threshold and the third duration are less than or equal to first preset time threshold, send first and execute instruction To line protective device；Wherein, the line protective device is used to protect the route of the compensator access, and described first executes Instruction is used to indicate the distance protection impedance for the route that the line protective device accesses compensator according to the first preset rules Definite value is updated；
Timing after transmission described first executes instruction after being spaced preset time period, obtains second voltage；
When the second voltage be greater than second predetermined voltage threshold, and the 6th duration be greater than third preset time threshold When, it sends second and executes instruction to the line protective device；Wherein, the 6th duration is that the second voltage is greater than The duration of second predetermined voltage threshold, second executes instruction and is used to indicate the line protective device and restores the benefit The distance protection impedance definite value for repaying the route of device access is to update the distance protection impedance definite value of the route of the compensator access Value before.
8. the method according to claim 1, wherein quickly by-pass switch it is in parallel with the series transformer, machine Tool by-pass switch is in parallel with the series transformer, described to exit after the series connection inverter and the series transformer, also Include:
When the mechanical bypass switch disconnects, sends third and execute instruction to line protective device；Wherein, the third executes Instruction is used to indicate the distance protection impedance definite value for the route that line protective device accesses compensator according to the second preset rules It is updated；
Since timing after sending the third and executing instruction after being spaced preset time period, obtain the line of the compensator access The electric current and voltage on road；
If the electric current of the route of the compensator access is within the scope of predetermined current, and the voltage of the route of compensator access In predetermined voltage range, the series connection inverter and the series transformer are enabled；
When mechanical bypass switch closure, notification signal is sent to the line protective device；Wherein, the notification signal For notifying the line protective device to restore the distance protection impedance definite value of the route of the compensator access as described in update Value before the distance protection impedance definite value of the route of compensator access.
9. the method according to claim 1, wherein
First preset time threshold is less than at the first time；Wherein, the first time is line protective device to the benefit Time and distance protection I sections of the protection act needed for repaying I sections of distance protection progress analytical calculations of the route of device access The sum of delay time；
Alternatively, first preset time threshold is less than the difference of the first time and the response time of quick by-pass switch.
10. a kind of method of influence of reduction compensator to route distance protection, which is characterized in that the described method includes:
Compensator is sent first is received to execute instruction；
It responds described first to execute instruction, obtain the distance protection impedance definite value of the route of compensator access and is set as the first resistance It is anti-；
Based on first impedance and the first preset rules, the distance protection impedance definite value of the route of compensator access is updated；
The compensator is sent second is received to execute instruction；
It responds described second to execute instruction, sets described for the distance protection impedance definite value for the route that the compensator accesses One impedance.
11. according to the method described in claim 10, it is characterized in that, being updated based on first impedance and the first preset rules The distance protection impedance definite value of the route of compensator access, comprising:
The impedance in the line side based on compensator access carries out equivalent process to the impedance of series connection inverter, obtains second Impedance；
First impedance, second impedance are added with the leakage reactance of series transformer, obtain third impedance；
The distance protection impedance definite value for updating the route of the compensator access is the third impedance.
12. a kind of method of influence of reduction compensator to route distance protection, which is characterized in that the described method includes:
The third that compensator is sent is received to execute instruction；
It responds the third to execute instruction, the first impedance is added to obtain the 4th impedance with the leakage reactance of series transformer；Wherein, First impedance is the distance protection impedance definite value of the route of compensator access；
The 4th impedance is set by the distance protection impedance definite value for the route that the compensator accesses；
Receive the notification signal that the compensator is sent；
The notification signal is responded, and sets described first for the distance protection impedance definite value for the route that the compensator accesses Impedance.
13. a kind of method of influence of reduction compensator to route distance protection, which is characterized in that the described method includes:
When the route of compensator access works normally, the series connection inverter in the route or compensator of compensator access is detected Electric current obtains the first electric current, and detects the voltage of the bus of compensator access or the route of compensator access, obtains the first electricity Pressure；
Compare the relationship between first electric current and predetermined current threshold；
If first electric current is greater than the predetermined current threshold, and the first duration was greater than the first preset time threshold, closed The series connection inverter is locked, triggering is connected with the quick by-pass switch of series transformer parallel connection, and is closed and the series-transformer The mechanical bypass switch of device parallel connection；Wherein, first duration is that first electric current is greater than the predetermined current threshold Duration；
Compare the relationship between the first voltage and the first predetermined voltage threshold；
If the first voltage is less than or equal to first predetermined voltage threshold, and the second duration was greater than second and presets The voltage of time threshold, the bus based on the access of compensator described in the output voltage control of inverter of connecting is described first Predetermined voltage threshold, and the electric current of element corresponding with first electric current is obtained, obtain the second electric current；Wherein, described second Duration is the duration that the first voltage is less than or equal to first predetermined voltage threshold；
If second electric current is greater than the predetermined current threshold, and the third duration is greater than the first preset time threshold Value, is latched the series connection inverter, and triggering is connected with the quick by-pass switch of the series transformer parallel connection, and closure with it is described The mechanical bypass switch of series transformer parallel connection；Wherein, the third duration is that second electric current is greater than described preset The duration of current threshold；
If second electric current is less than or equal to the predetermined current threshold, if second electric current be greater than it is described default Current threshold and the third duration are less than or equal to first preset time threshold, acquisition and the first voltage The voltage of corresponding route, obtains second voltage；
If if the second voltage is greater than first predetermined voltage threshold or the second voltage is equal to described first and presets Voltage threshold, and it is institute that the effect of the output voltage of the series connection inverter, which is the voltage of the bus of reduction compensator access, When stating the first predetermined voltage threshold, the voltage of the bus for the compensator access of removing controls is the first predeterminated voltage threshold Value, and the electric current of the series connection inverter in the route or compensator that obtain compensator access is executed, obtain the first electric current.
14. a kind of compensator, which is characterized in that the compensator includes: first acquisition unit, the first comparing unit, exits list Member and first processing units；Wherein:
The first acquisition unit is obtained for obtaining the electric current of the series connection inverter in the route or compensator that compensator accesses To the first electric current；Wherein, the compensator is used to control the electric current of the route of compensator access, and the compensator includes static same Walk flow controller and convertible static compensator between series compensator, THE UPFC, line；
The first acquisition unit is also used to obtain the electricity of the bus of the compensator access or the route of compensator access Pressure, obtains first voltage；
First comparing unit, for the relationship between first electric current and predetermined current threshold；
First comparing unit, the relationship being also used between first voltage described in comparison and the first predetermined voltage threshold；
It is described to exit unit, if being greater than the predetermined current threshold for first electric current, and the first duration was greater than the One preset time threshold exits the series connection inverter and series transformer；Wherein, the series transformer is the compensator In equipment, first duration be first electric current be greater than the predetermined current threshold duration；
The first processing units, if being less than or equal to first predetermined voltage threshold, and for the first voltage Two duration were greater than the second preset time threshold, compensator access described in the output voltage control based on the series connection inverter The voltage of bus be first predetermined voltage threshold, and obtain the electric current of corresponding with first electric current element, obtain Second electric current；Wherein, second duration is that the first voltage is less than or equal to first predetermined voltage threshold Duration；
It is described to exit unit, if being also used to second electric current greater than the predetermined current threshold, and the third duration is greater than First preset time threshold exits the series connection inverter and the series transformer；Wherein, the third duration It is the duration that second electric current is greater than the predetermined current threshold.
15. compensator according to claim 14, which is characterized in that after the first processing units further include: second Comparing unit and the second processing unit；Wherein:
The first acquisition unit, if being also used to second electric current less than or equal to the predetermined current threshold, Huo Zheruo When second electric current is greater than the predetermined current threshold and the third duration default less than or equal to described first Between threshold value, obtain the voltage of corresponding with first voltage route, obtain second voltage；
Second comparing unit, for the relationship between the second voltage and first predetermined voltage threshold；
Described the second processing unit, if if being greater than first predetermined voltage threshold or described second for the second voltage Voltage is equal to first predetermined voltage threshold, and the effect of the output voltage of the series connection inverter is to reduce the compensator When the voltage of the bus of access is first predetermined voltage threshold, the voltage of the bus for the compensator access of removing controls is First predetermined voltage threshold, and execute the electricity of the series connection inverter in the route or compensator that the acquisition compensator accesses Stream, obtains the first electric current.
16. compensator according to claim 15, which is characterized in that before second comparing unit further include: setting Unit；Wherein:
The setting unit, if the output voltage for the series connection inverter is the voltage rating of the series connection inverter, and The second voltage is less than or equal to first predetermined voltage threshold, and keeping the output voltage of the series connection inverter is institute State the voltage rating of series connection inverter.
17. compensator according to claim 14, which is characterized in that after the first processing units further include: third Processing unit and fourth processing unit；Wherein:
The first acquisition unit, if being also used to second electric current less than or equal to the predetermined current threshold, Huo Zheruo When second electric current is greater than the predetermined current threshold and the third duration default less than or equal to described first Between threshold value, obtain the voltage of corresponding with first voltage route, obtain second voltage；
First comparing unit, the relationship being also used between second voltage described in comparison and the second predetermined voltage threshold；
The third processing unit, if for the second voltage be less than second predetermined voltage threshold, and the 4th continue when Between be more than or equal to third preset time threshold, the output voltage that the series connection inverter is arranged is zero, is obtained and described the The voltage of the corresponding route of one voltage, obtains tertiary voltage；Wherein, the 4th duration be the second voltage be less than or Person is equal to the duration of second predetermined voltage threshold；
The third processing unit, if being also used to the tertiary voltage greater than second predetermined voltage threshold, and the 5th continues Time is more than or equal to the third preset time threshold, and the output voltage for cancelling the setting series connection inverter is zero, and The voltage for obtaining route corresponding with the first voltage, obtains the 4th voltage；Wherein, the 5th duration is described Three voltages are greater than the duration of second predetermined voltage threshold；
The fourth processing unit, if if being greater than first predetermined voltage threshold or the described 4th for the 4th voltage Voltage is equal to first predetermined voltage threshold, and the effect of the output voltage of the series connection inverter is to reduce the compensator When the voltage of the bus of access is first predetermined voltage threshold, the voltage of the bus for the compensator access of removing controls is First predetermined voltage threshold, and execute the electricity of the series connection inverter in the route or compensator that the acquisition compensator accesses Stream, obtains the first electric current；
The first acquisition unit, if being also used to the second voltage greater than second predetermined voltage threshold, if described When second voltage is less than or equal to second predetermined voltage threshold and the 4th duration default less than the third Between threshold value, obtain the voltage of corresponding with first voltage route, obtain the 5th voltage；
The fourth processing unit, if being also used to the 5th voltage greater than first predetermined voltage threshold, if described 5th voltage is equal to first predetermined voltage threshold, and the effect of the output voltage of the series connection inverter is to reduce the benefit When the voltage for repaying the bus of device access is first predetermined voltage threshold, the electricity of the bus for the compensator access of removing controls Pressure is first predetermined voltage threshold, and executes the series connection inverter in the route or compensator that the acquisition compensator accesses Electric current, obtain the first electric current.
18. compensator according to claim 14, which is characterized in that it is described exit unit include: first processing module and Second processing module；Wherein:
The first processing module for being latched the series connection inverter, and triggers in parallel with the series transformer quick By-pass switch conducting；
The Second processing module, for being closed the mechanical bypass switch in parallel with the series transformer.
19. compensator according to claim 14, which is characterized in that described to exit after unit further include: second obtains Unit and first enables unit；Wherein:
The second acquisition unit, the electric current and electricity of the route for when preset time arrives, obtaining the compensator access Pressure；
Described first enables unit, and described if the electric current of the route for compensator access is within the scope of predetermined current The voltage of the route of compensator access enables the series connection inverter and the series transformer in predetermined voltage range.
20. compensator according to claim 14, which is characterized in that after the first processing units further include: first Transmission unit and third acquiring unit；Wherein:
First transmission unit, for being less than or equal to the predetermined current threshold when second electric current, if institute The second electric current is stated greater than the predetermined current threshold and the third duration is less than or equal to first preset time When threshold value, sends first and execute instruction to line protective device；Wherein, the line protective device is for protecting the compensator The route of access, described first executes instruction and is used to indicate the line protective device and is connect according to the first preset rules to compensator The distance protection impedance definite value of the route entered is updated；
The third acquiring unit, for since send described first execute instruction after timing, be spaced preset time period after, obtain Take second voltage；
First transmission unit is also used to be greater than second predetermined voltage threshold when the second voltage, and the 6th continues When time is greater than third preset time threshold, sends second and execute instruction to the line protective device；Wherein, it the described 6th holds The continuous time is the duration that the second voltage is greater than second predetermined voltage threshold, and described second executes instruction for referring to Show that the line protective device restores the distance protection impedance definite value of the route of the compensator access to update the compensator Value before the distance protection impedance definite value of the route of access.
21. compensator according to claim 14, which is characterized in that quick by-pass switch and the series transformer are simultaneously Connection, mechanical bypass switch is in parallel with the series transformer, described to exit after unit further include: the second transmission unit, the 4th Acquiring unit and second enables unit；Wherein:
Second transmission unit, for sending third and executing instruction to route protection when the mechanical bypass switch disconnects Equipment；Wherein, the third, which executes instruction, is used to indicate what line protective device accessed compensator according to the second preset rules The distance protection impedance definite value of route is updated；
4th acquiring unit, after sending the third and executing instruction timing, after being spaced preset time period, obtain institute State the electric current and voltage of the route of compensator access；
Described second enables unit, and described if the electric current of the route for compensator access is within the scope of predetermined current The voltage of the route of compensator access enables the series connection inverter and the series transformer in predetermined voltage range；
Second transmission unit, for sending notification signal to the route protection when mechanical bypass switch closure Equipment；Wherein, the distance for the route that the notification signal is used to that the line protective device to be notified to restore the compensator access Protect the value before the distance protection impedance definite value that impedance definite value is the route of the update compensator access.
22. compensator according to claim 14, which is characterized in that
First preset time threshold is less than at the first time；Wherein, the first time is line protective device to the benefit Time and distance protection I sections of the protection act needed for repaying I sections of distance protection progress analytical calculations of the route of device access The sum of delay time；
Alternatively, first preset time threshold is less than the difference of the first time and the response time of quick by-pass switch.
23. a kind of line protective device, which is characterized in that the line protective device includes: the first receiving unit, the 5th processing Unit and updating unit；Wherein:
First receiving unit, first for receiving compensator transmission executes instruction；
5th processing unit is executed instruction for responding described first, obtains the distance protection of the route of compensator access Impedance definite value is simultaneously set as the first impedance；
The updating unit, for be based on first impedance and the first preset rules, update compensator access route away from From protection impedance definite value；
First receiving unit is executed instruction for receiving the compensator is sent second；
5th processing unit is executed instruction for responding described second, and the distance for the route that the compensator is accessed is protected Shield impedance definite value is set as first impedance.
24. based on the equipment described in claim 23, which is characterized in that the updating unit includes: first processing module, calculates Module and update module；Wherein:
The first processing module, the impedance in the line side for being accessed based on the compensator, the impedance to series connection inverter Equivalent process is carried out, the second impedance is obtained；
The computing module is obtained for first impedance, second impedance to be added with the leakage reactance of series transformer Third impedance；
The update module, the distance protection impedance definite value of the route for updating the compensator access are third resistance It is anti-.
25. a kind of line protective device, which is characterized in that the line protective device includes: the second receiving unit, the 6th processing Unit and setting unit；Wherein:
Second receiving unit, the third for receiving compensator transmission execute instruction；
6th processing unit is executed instruction for responding the third, by the leakage reactance of the first impedance and series transformer Addition obtains the 4th impedance；Wherein, first impedance is the distance protection impedance definite value of the route of compensator access；
The setting unit, the distance protection impedance definite value of the route for accessing the compensator are set as the 4th resistance It is anti-；
Second receiving unit is also used to receive the notification signal that the compensator is sent；
6th processing unit is also used to respond the notification signal, and the distance for the route that the compensator is accessed is protected Shield impedance definite value is set as first impedance.
26. a kind of compensator, which is characterized in that the compensator includes: detection unit, third comparing unit, the 7th processing list Member, the 8th processing unit and the 5th acquiring unit；Wherein:
The detection unit, when the route for accessing when compensator works normally, the route of detection compensator access or compensation The electric current of series connection inverter in device obtains the electricity of the bus of the first electric current and compensator access or the route of compensator access Pressure, obtains first voltage；
The third comparing unit, for the relationship between first electric current and predetermined current threshold；
7th processing unit, if being greater than the predetermined current threshold for first electric current, and the first duration is big In the first preset time threshold, it is latched the series connection inverter, triggering is connected with the quick by-pass switch of series transformer parallel connection, And it is closed the mechanical bypass switch in parallel with the series transformer；Wherein, first duration is first electric current Greater than the duration of the predetermined current threshold；
The third comparing unit, the relationship being also used between first voltage described in comparison and the first predetermined voltage threshold；
8th processing unit, if being less than or equal to first predetermined voltage threshold, and for the first voltage Two duration were greater than the second preset time threshold, compensator access described in the output voltage control based on the series connection inverter The voltage of bus be first predetermined voltage threshold, and obtain the electric current of corresponding with first electric current element, obtain Second electric current；Wherein, second duration is that the first voltage is less than or equal to first predetermined voltage threshold Duration；
7th processing unit, if being also used to second electric current is greater than the predetermined current threshold, and third duration Greater than first preset time threshold, it is latched the series connection inverter, triggers the Quick side in parallel with the series transformer Way switch conducting, and it is closed the mechanical bypass switch in parallel with the series transformer；Wherein, the third duration is institute State the duration that the second electric current is greater than the predetermined current threshold；
5th acquiring unit, if being less than or equal to the predetermined current threshold for second electric current, if institute The second electric current is stated greater than the predetermined current threshold and the third duration is less than or equal to first preset time Threshold value obtains the voltage of route corresponding with the first voltage, obtains second voltage；
8th processing unit, if if being also used to the second voltage greater than first predetermined voltage threshold or described the Two voltages are equal to first predetermined voltage threshold, and the effect of the output voltage of the series connection inverter is to reduce the compensation When the voltage of the bus of device access is first predetermined voltage threshold, the voltage of the bus for the compensator access of removing controls For first predetermined voltage threshold, and execute the electricity of the series connection inverter in the route or compensator that obtain compensator access Stream, obtains the first electric current.
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CN107026432B (en) * 2017-05-26 2019-07-19 南京南瑞继保电气有限公司 A kind of method and apparatus inhibiting influence of the compensator to route distance protection
CN108365597B (en) * 2018-01-29 2021-11-26 中国电力科学研究院有限公司 Interturn fault diagnosis method and system for series transformer after thyristor bypass switch is quickly closed

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