CN106849147B - A kind of control method reducing direct current transportation commutation failure probability - Google Patents
A kind of control method reducing direct current transportation commutation failure probability Download PDFInfo
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- CN106849147B CN106849147B CN201710085551.6A CN201710085551A CN106849147B CN 106849147 B CN106849147 B CN 106849147B CN 201710085551 A CN201710085551 A CN 201710085551A CN 106849147 B CN106849147 B CN 106849147B
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/36—Arrangements for transfer of electric power between ac networks via a high-tension dc link
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/60—Arrangements for transfer of electric power between AC networks or generators via a high voltage DC link [HVCD]
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Abstract
The invention proposes a kind of control methods for reducing direct current transportation commutation failure probability, install THE UPFC in the adjacent Exchange Station of DC transmission system Inverter Station, the THE UPFC and DC transmission system access the same AC system.Using the above structure, after detecting that DC transmission system Inverter Station alternating voltage reduces, it is quickly injecting voltage control model by the control mode switch of THE UPFC, and control the voltage for improving THE UPFC access bus, to improve the voltage of DC transmission system Inverter Station access ac bus, reduce the probability that commutation failure occurs for DC transmission system.Compared to other reactive compensations and voltage-operated device, this structure has more preferable economy, this control method has more significant effect for reducing direct current transportation commutation failure probability.
Description
Technical field
The present invention relates to a kind of alternating current-direct currents to mix technology of transmission of electricity, and in particular to a kind of reduction direct current transportation commutation failure probability
Control method.
Background technique
Line commutation HVDC transmission system based on thyristor has transmission line capability big, route low cost, asynchronous
Networked capabilities are strong, long-distance and large-capacity power transmission and it is big in terms of tool have great advantage.DC transmission system is close greatly
Degree access AC network is brought huge so that it is increasingly complicated to influence each other between AC and DC system to the safe and stable operation of power grid
Challenge.The commutation failure failure of high power DC system is relatively common, is mostly caused by receiving end fault in ac transmission system.Commutation failure
Period dc power declines to a great extent, and the synchronous generator of direct current sending end power grid accelerates, if the commutation failure duration is short, direct current function
The fast quick-recovery of rate energy, influences less the stable operation of system, but continuous influence of the commutation failure to system stability is tighter
Weight, the repeated stock of continuous commutation failure may cause sending end unit and exchange contact section off-the-line with important with respect to generator rotor angle unstability.
The reason of leading to commutation failure failure, has very much, but when thyristor and its triggering system work normally, occurs
The main reason for commutation failure is caused grid voltage sags or fluctuation when receiving end grid collapses.Direct current transportation at present
Engineer application and published patent mainly inhibit commutation failure by the optimization to direct current transportation control strategy, most of
To increase shutdown angle or reducing DC current, the auxiliary preventive means of commutation failure can be used as, but can not fundamentally avoid changing
The mutually generation of failure.
Large capacity STATCOM and large capacity phase modulation are installed in someone's research in recent years near DC transmission system Inverter Station
Machine compensates the reactive power of Inverter Station, the voltage of Inverter Station is improved in the system failure, so that reducing Inverter Station occurs commutation
The probability of failure, but this method is suitable only for the lighter operating condition of receiving end electric network fault, when grid voltage sags are more serious, compensation electricity
Reactive capability required for pressure is fallen is very big, and existing reactive power compensator cannot cope with.
Therefore, it is necessary to study one kind to improve the stronger structure of system voltage efficiency power and control method in failure, solution
Certainly existing reactive power compensator cannot cope with Voltage Drop when power grid catastrophe failure, change to more effectively reduce direct current transportation
The mutually probability of failure.THE UPFC, also known as UPFC (Unified Power Flow Controller), are to be at present
The only best tidal current controller of versatility, with the different control function such as shunt compensation, series compensation and phase shift, in addition to
It can optimize outside electric network swim when stable state, can improve its by its quick voltage compensation ability and access busbar voltage when transient state.
Summary of the invention
The purpose of the present invention is to provide a kind of control method for reducing direct current transportation commutation failure probability, can be
The alternating voltage of DC transmission system Inverter Station is quickly and effectively improved when failure of uniting, to reduce direct current transportation commutation failure
Probability.Control method of the present invention based on structure there is preferable warp compared to the structure of present inhibition direct current transportation commutation failure
Ji property, the controlling party rule have better inhibitory effect and control flexibility.
In order to achieve the above object, solution of the invention is:
A kind of control method reducing direct current transportation commutation failure probability, it is characterised in that:
The structure of above-mentioned reduction direct current transportation commutation failure probability include: DC transmission system, THE UPFC and
AC transmission system；Above-mentioned exchange is accessed with the THE UPFC in the exchange side of the DC transmission system Inverter Station
Transmission system；The THE UPFC is arranged near the DC transmission system Inverter Station；
Above-mentioned THE UPFC includes side in parallel and series side two parts；The series side of the THE UPFC
Including series transformer and series connection inverter, side in parallel includes shunt transformer and parallel inverter；The Unified Power Flow control
The series transformer side winding of device is connect with the exchange side of the series connection inverter, and other side winding split-phase seals in the exchange
The three-phase AC line of system；The friendship of the shunt transformer side winding and the parallel inverter of the THE UPFC
Side connection is flowed, other side winding accesses the ac bus of the AC transmission system.
The control method of above-mentioned reduction direct current transportation commutation failure probability:
1), the series side of above-mentioned THE UPFC operates in line power control model, direct current described in real-time detection
The alternating voltage of transmission system Inverter Station, and above-mentioned alternating voltage minimum when one power control operational mode of setting
Ubus_Lim；
2), it is lower than above-mentioned alternating voltage minimum in the alternating voltage for detecting the DC transmission system Inverter Station
After Ubus_Lim, by the series side control model of THE UPFC from line power control mode switch be injecting voltage control
Molding formula；3 are entered step later；
3), on the basis of the head end voltage direction that THE UPFC series side 4 controls route, above-mentioned unified tide is controlled
The series side of stream controller injects a voltage identical with above-mentioned DC transmission system Inverter Station ac bus direction, quickly mentions
The voltage of high THE UPFC access bus, maintains the alternating voltage of DC transmission system Inverter Station in above-mentioned alternating voltage
Minimum Ubus_Lim reduces the probability that commutation failure occurs for DC transmission system；4 are entered step later；
4), when the alternating voltage for detecting DC transmission system Inverter Station maintains above-mentioned alternating voltage minimum Ubus_
Lim, and the effect of the voltage of the series side injection of above-mentioned THE UPFC is to reduce above-mentioned THE UPFC access
When the voltage of bus, by the series side control model of THE UPFC from injecting voltage control mode switch be line power
Control model.
After the voltage of above-mentioned THE UPFC series side injection reaches the load voltage value of series transformer, still cannot
Maintain the alternating voltage of the DC transmission system Inverter Station in the alternating voltage minimum Ubus_Lim of the setting, then it is described
The voltage that THE UPFC keeps series side to inject remains the load voltage value of series transformer.
Above-mentioned THE UPFC is arranged in the Inverter Station alternating-current field of the DC transmission system, the Unified Power Flow control
The series side control route of device control processed and the converter power transformer of the DC transmission system Inverter Station access same ac bus.
Above-mentioned THE UPFC is arranged in the Exchange Station near the Inverter Station of the DC transmission system, then described to subtract
The alternating voltage minimum Ubus_Lim set described in the control method of small direct current transportation commutation failure probability is Unified Power Flow
The minimum for the ac bus voltage that the three-phase AC line that controller series transformer split-phase seals in is connected.
The ac bus series transformer split-phase of above-mentioned THE UPFC shunt transformer access seals in
Other ac bus of ac bus or the AC transmission system that three-phase AC line is connected.
The ac bus series transformer split-phase of above-mentioned THE UPFC shunt transformer access seals in
The ac bus that three-phase AC line is connected then sets another voltage-operated minimum Ubus_ of ac bus
Low, the voltage-operated minimum Ubus_low of ac bus are greater than Ubus_Lim；Correspondingly, the reduction direct current transportation
The control method of commutation failure probability is the method for two-stage coordinated control；
The first order of the two-stage control method for coordinating controls are as follows:
A) after detecting the voltage of the ac bus lower than above-mentioned alternating voltage minimum Ubus_low, the unification
The side in parallel of flow controller, which controls to increase rapidly, injects the reactive power that the ac bus provides, to maintain ac bus
Voltage reduces the probability that commutation failure occurs for DC transmission system.2 are entered step later
B) when the voltage for detecting the ac bus cannot be maintained at above-mentioned alternating voltage minimum lower than Ubus_low
Afterwards, the idle holding output of the side injected system in parallel of the THE UPFC is its maximum capacity；Enter second later
Grade control；
The second level control of the two-stage control method for coordinating is the aforementioned control for reducing direct current transportation commutation failure probability
Method and step 1)~4):
1), the series side of above-mentioned THE UPFC operates in line power control model, direct current described in real-time detection
The alternating voltage of transmission system Inverter Station, and above-mentioned alternating voltage minimum when one power control operational mode of setting
Ubus_Lim；
2), it is lower than above-mentioned alternating voltage minimum in the alternating voltage for detecting the DC transmission system Inverter Station
After Ubus_Lim, by the series side control model of THE UPFC from line power control mode switch be injecting voltage control
Molding formula；3 are entered step later；
3), on the basis of the head end voltage direction that THE UPFC series side 4 controls route, above-mentioned unified tide is controlled
The series side of stream controller injects a voltage identical with above-mentioned DC transmission system Inverter Station ac bus direction, quickly mentions
The voltage of high THE UPFC access bus, maintains the alternating voltage of DC transmission system Inverter Station in above-mentioned alternating voltage
Minimum Ubus_Lim reduces the probability that commutation failure occurs for DC transmission system；4 are entered step later；
4), when the alternating voltage for detecting DC transmission system Inverter Station maintains above-mentioned alternating voltage minimum Ubus_
Lim, and the effect of the voltage of the series side injection of above-mentioned THE UPFC is to reduce above-mentioned THE UPFC access
When the voltage of bus, by the series side control model of THE UPFC from injecting voltage control mode switch be line power
Control model.
The above method is it is to be understood that the series side in the THE UPFC operates in line power control mould
Formula, the implementation steps of the control method for reducing direct current transportation commutation failure probability also increase preposition coordinated control step before
Suddenly, the first order that the preposition coordinated control step corresponds to two-stage control method for coordinating controls.Aforementioned reduction direct current transportation is changed
Mutually failure probability control method step 4) to 5) be Two-stage control.
When above-mentioned THE UPFC parallel connection side is broken down, series side inverter can isolated operation, accordingly
Reduce the control method of direct current transportation commutation failure probability are as follows:
1), the series side of above-mentioned THE UPFC operates in line power control model, direct current described in real-time detection
The alternating voltage of transmission system Inverter Station, and above-mentioned alternating voltage minimum when one power control operational mode of setting
Ubus_Lim；
2), it is lower than above-mentioned alternating voltage minimum in the alternating voltage for detecting the DC transmission system Inverter Station
After Ubus_Lim, by the series side control model of THE UPFC from line power control mode switch be constant impedance control
Mode；3 are entered step later；
3) series side one reactance of equivalent injection of above-mentioned THE UPFC, equivalent raising Unified Power Flow control, are controlled
The electrical distance of device injection route processed maintains DC transmission system to improve the voltage of THE UPFC access bus
The alternating voltage of Inverter Station reduces the machine that commutation failure occurs for DC transmission system in above-mentioned alternating voltage minimum Ubus_Lim
Rate；4 are entered step later；
4), when the alternating voltage for detecting DC transmission system Inverter Station is greater than above-mentioned alternating voltage minimum Ubus_Lim
When, by the series side control model of THE UPFC from injecting voltage control mode switch be line power control model.
The route of above-mentioned THE UPFC series side control is double-circuit line, is required to pass through on the double-circuit line
Configure a set of series side inverter and series side transformer.Above-mentioned double-circuit line power control operational mode alternating voltage most
Low value Ubus_Lim is identical, minimum lower than above-mentioned alternating voltage in the alternating voltage for detecting the DC transmission system Inverter Station
After value Ubus_Lim, the series side control model of the double-circuit line is required to from line power control mode switch be injection electricity
Press control model.
After adopting the above scheme, ac bus of the DC transmission system Inverter Station in the system failure can be improved in the present invention
Voltage reduces the probability of commutation failure, improves the stability of DC transmission system and entire AC system.Press down compared to others
The measure of commutation failure processed, inhibitory effect of the invention and economy, flexibility are more preferable.
Detailed description of the invention
Fig. 1 is the structure chart that DC transmission system, AC transmission system are connected with THE UPFC；
In figure, 1 is the converting plant of DC transmission system, and 2 be the Inverter Station of DC transmission system, and 3 control for Unified Power Flow
The side in parallel of device, 4 be the series side of THE UPFC；
Fig. 2 is that the ac bus of THE UPFC shunt transformer access is other exchanges mother of AC transmission system
Line schematic diagram；
Fig. 3 is the schematic diagram that THE UPFC parallel connection side is broken down；
Fig. 4 is the main control flow chart proposed by the present invention for reducing direct current transportation commutation failure probability；
Fig. 5 is the first order control flow chart for the two poles of the earth control that the present invention reduces direct current transportation commutation failure probability；
Fig. 6 is control flow chart of the present invention when THE UPFC parallel connection side is out of service.
Specific embodiment
Detailed description of the preferred embodiments with reference to the accompanying drawing.
The present invention proposes that a kind of control method for reducing direct current transportation commutation failure probability, the method are applied in such as Fig. 1
Shown in structure, comprising: DC transmission system, THE UPFC and AC transmission system；The DC transmission system
The exchange side of Inverter Station 2 and the THE UPFC access above-mentioned AC transmission system；The THE UPFC
It is arranged near the DC transmission system Inverter Station；
Aforementioned THE UPFC includes side 3 in parallel and 4 two parts of series side；The series connection of the THE UPFC
Side 4 includes series transformer and series connection inverter, and side 3 in parallel includes shunt transformer and parallel inverter；The Unified Power Flow
The series transformer side winding of controller is connect with the exchange side of the series connection inverter, and other side winding split-phase seals in described
The three-phase AC line of AC system；The shunt transformer side winding and the parallel inverter of the THE UPFC
The connection of exchange side, other side winding accesses the ac bus of the AC transmission system.
The aforementioned control method for reducing direct current transportation commutation failure probability is as follows, and flow chart is as shown in Fig. 4:
1) series side of above-mentioned THE UPFC operates in line power control model, and direct current described in real-time detection is defeated
The alternating voltage of electric system Inverter Station, and above-mentioned alternating voltage minimum Ubus_ when one line power control model of setting
Lim；
2) it is lower than above-mentioned alternating voltage minimum in the alternating voltage for detecting the DC transmission system Inverter Station 2
After Ubus_Lim, by 4 control model of series side of THE UPFC from line power control mode switch be injecting voltage
Control model；It enters step later 3)；
3) on the basis of the head end voltage direction that THE UPFC series side 4 controls route, above-mentioned unified tide is controlled
The series side 4 of stream controller injects a voltage identical with above-mentioned 2 ac bus direction of DC transmission system Inverter Station, quickly
The voltage for improving THE UPFC access bus, maintains the alternating voltage of DC transmission system Inverter Station 2 in above-mentioned exchange
Voltage minimum Ubus_Lim reduces the probability that commutation failure occurs for DC transmission system；4 are entered step later；
4) when the alternating voltage for detecting DC transmission system Inverter Station 2 maintains above-mentioned alternating voltage minimum Ubus_
Lim, and the effect of the voltage of the injection of series side 4 of above-mentioned THE UPFC is to reduce above-mentioned THE UPFC access
When the voltage of bus, by 4 control model of series side of THE UPFC from injecting voltage control mode switch be route function
Rate control model.
The effect for the voltage that the series side 4 of above-mentioned THE UPFC injects is to reduce above-mentioned THE UPFC to connect
Enter the voltage of bus, the method is as follows: on the basis of the head end voltage direction that THE UPFC series side 4 controls route, such as
4 injected system voltage of THE UPFC series side and line termination voltage are contrary (phase difference is between 90~180 degree),
It may determine that the work of THE UPFC series side 4 at this time in the state for reducing ac bus voltage, it is believed that at this time
System has been restored normally, can be by the control model switchback line power control model of the series side 4 of THE UPFC.
After the voltage of aforementioned THE UPFC series side injection reaches the load voltage value of series transformer, still cannot
Maintain the alternating voltage of the DC transmission system Inverter Station 2 in the alternating voltage minimum Ubus_Lim of the setting, then institute
The voltage for stating the injection of THE UPFC series side 4 remains the load voltage value of series transformer.
Aforementioned THE UPFC is arranged in the alternating-current field of the Inverter Station 2 of the DC transmission system, the unified tide
The series side 4 of stream controller control controls route and the converter power transformer of the DC transmission system Inverter Station 2 accesses same friendship
Flow bus.
If aforementioned THE UPFC is arranged in the Exchange Station near the Inverter Station 2 of the DC transmission system,
The alternating voltage minimum Ubus_Lim set described in the control method for reducing direct current transportation commutation failure probability is system
The minimum for the ac bus voltage that the three-phase AC line that one flow controller series transformer split-phase seals in is connected.
The ac bus series transformer split-phase of aforementioned THE UPFC shunt transformer access seals in
Other ac bus of ac bus or the AC transmission system that three-phase AC line is connected.As shown in Fig. 2, one
The ac bus of flow controller shunt transformer access is other ac bus of the AC transmission system.
If the ac bus of aforementioned THE UPFC shunt transformer access is that the series transformer split-phase seals in
The ac bus that is connected of three-phase AC line, then set another voltage-operated minimum Ubus_ of ac bus
Low, the voltage-operated minimum Ubus_low of ac bus are greater than Ubus_Lim；Correspondingly, the Unified Power Flow control
The series side of device operates in line power control model, and the control method for reducing direct current transportation commutation failure probability is two-stage
The method of coordinated control；
The first order of the two-stage control method for coordinating controls as follows, flow chart such as attached drawing 5:
A) after detecting the voltage of the ac bus lower than above-mentioned alternating voltage minimum Ubus_low, the unification
The side in parallel of flow controller, which controls to increase rapidly, injects the reactive power that the ac bus provides, to maintain ac bus
Voltage reduces the probability that commutation failure occurs for DC transmission system.B is entered step later；
B) it is lower than Ubus_ when the voltage for detecting the ac bus cannot still be maintained at above-mentioned alternating voltage minimum
After low, the idle holding output of the side injected system in parallel of the THE UPFC is its maximum capacity；Enter the later
Two-stage control；
The above method is it is to be understood that the series side in the THE UPFC operates in line power control mould
Formula, the implementation steps of the control method for reducing direct current transportation commutation failure probability also increase preposition coordinated control step before
Suddenly, the first order that the preposition coordinated control step corresponds to two-stage control method for coordinating controls.The two-stage coordinated control side
The second level control of method reduces control method step 1)~4 of direct current transportation commutation failure probability for signature), flow chart such as attached drawing
4。
Coordinated by the two-step evolution of attached drawing 4 and attached drawing 5, is sent out in the high-power operation of direct current system or direct current system distal end
When raw failure, system voltage fall smaller, keep direct current defeated by the control of first order THE UPFC parallel connection side inverter
Electric system Inverter Station ac bus voltage is not less than Ubus_low；If failure occurs to fall in proximal end, system voltage larger, pass through
Inverter Station ac bus voltage can not be maintained Ubus_low by the control of the first order, when system voltage drops to Ubus_Lim
When, second level control action, control makes DC transmission system Inverter Station ac bus voltage in Ubus_Lim；After failure vanishes,
System voltage rises, and second level control at this time can still work system Inverter Station ac bus voltage in Ubus_Lim, but this
When 4 injected system voltage of THE UPFC series side direction with before on the contrary, by the way that THE UPFC is connected
4 injected system voltage of side is compared with ac bus voltage or line termination voltage, it can be determined that whether extensive goes out system voltage
It is multiple normal: as 4 injected system voltage of THE UPFC series side is contrary with line termination voltage, it can be determined that go out at this time
The work of THE UPFC series side 4 then can determine whether that system restores normal in the state for reducing ac bus voltage, unified
Flow controller series side 4 can be power control mode from injecting voltage control mode switch, restore to operate normally.
When THE UPFC parallel connection above-mentioned side is broken down, series side inverter can isolated operation, structure chart
Such as attached drawing 3, the corresponding control method for reducing direct current transportation commutation failure probability is as follows, flow chart such as attached drawing 6:
1) series side of above-mentioned THE UPFC operates in line power control model, and direct current described in real-time detection is defeated
The alternating voltage of electric system Inverter Station, and set an above-mentioned alternating voltage minimum when line power control model operation
Ubus_Lim；
2) it is lower than above-mentioned alternating voltage minimum Ubus_ in the alternating voltage for detecting the DC transmission system Inverter Station
After Lim, by the series side control model of THE UPFC from line power control mode switch be constant impedance control model；
3 are entered step later；
3) series side one reactance of equivalent injection of above-mentioned THE UPFC, equivalent raising Unified Power Flow control are controlled
Device injects the electrical distance of route, to improve the voltage of THE UPFC access bus, maintains DC transmission system inverse
Become the alternating voltage at station in above-mentioned alternating voltage minimum Ubus_Lim, reduces the machine that commutation failure occurs for DC transmission system
Rate；4 are entered step later；
4) when the alternating voltage for detecting DC transmission system Inverter Station is greater than above-mentioned alternating voltage minimum Ubus_Lim
When, by the series side control model of THE UPFC from constant impedance control mode switch be line power control model.
The route of aforementioned THE UPFC series side control is double-circuit line, is required to configure on the double-circuit line
At least a set of series side inverter and series side transformer.Above-mentioned double-circuit line power control operational mode alternating voltage most
Low value Ubus_Lim is identical, minimum lower than above-mentioned alternating voltage in the alternating voltage for detecting the DC transmission system Inverter Station
After value Ubus_Lim, the series side control model of the double-circuit line is required to from line power control mode switch be injection electricity
Press control model.
Finally it should be noted that: only illustrate technical solution of the present invention rather than its limitations in conjunction with above-described embodiment.Institute
The those of ordinary skill in category field is to be understood that: those skilled in the art can repair a specific embodiment of the invention
Change or equivalent replacement, but these modifications or change are being applied within pending patent requirements protection scope.
Claims (9)
1. a kind of control method for reducing direct current transportation commutation failure probability, it is characterised in that:
The method is applied in the structure for including DC transmission system, THE UPFC and AC transmission system；It is described
The exchange side of DC transmission system Inverter Station and the THE UPFC access above-mentioned AC transmission system；The unification
Flow controller includes side in parallel and series side two parts, wherein series side includes series transformer and series connection inverter, parallel connection
Side includes shunt transformer and parallel inverter；Series transformer side winding connects with the side that exchanges of the series connection inverter
It connects, other side winding split-phase seals in the three-phase AC line of the AC system；Shunt transformer side winding with it is described
The exchange side of parallel inverter connects, and other side winding accesses the ac bus of the AC transmission system；
The control method includes:
1) series side of above-mentioned THE UPFC operates in line power control model, DC power transmission system described in real-time detection
The alternating voltage for Inverter Station of uniting, and above-mentioned alternating voltage minimum Ubus_Lim when one line power control model of setting；
2) it is lower than above-mentioned alternating voltage minimum Ubus_Lim in the alternating voltage for detecting the DC transmission system Inverter Station
Afterwards, by the series side control model of THE UPFC from line power control mode switch be injecting voltage control model；
3) series side for controlling above-mentioned THE UPFC injects one and above-mentioned DC transmission system Inverter Station ac bus
The identical voltage of voltage direction, quickly improve THE UPFC access bus voltage, maintain DC transmission system it is inverse
Become the alternating voltage at station in above-mentioned alternating voltage minimum Ubus_Lim, reduces the machine that commutation failure occurs for DC transmission system
Rate；
4) when the alternating voltage for detecting DC transmission system Inverter Station maintains above-mentioned alternating voltage minimum Ubus_Lim, and
The effect of the voltage of the series side injection of above-mentioned THE UPFC is to reduce above-mentioned THE UPFC access bus
When voltage, the series side control model of THE UPFC is controlled into mould from injecting voltage control mode switch for line power
Formula.
2. a kind of control method for reducing direct current transportation commutation failure probability as described in claim 1, it is characterised in that: if
After the voltage of the THE UPFC series side injection reaches the load voltage value of series transformer, it cannot still remain described
The alternating voltage of DC transmission system Inverter Station is in the alternating voltage minimum Ubus_Lim of the setting, then the Unified Power Flow
The voltage of controller series side injection remains the load voltage value of series transformer.
3. a kind of control method for reducing direct current transportation commutation failure probability as described in claim 1, it is characterised in that: described
THE UPFC is arranged in the Inverter Station exchange side of the DC transmission system, then the THE UPFC controls
Series side controls route and the converter power transformer of the DC transmission system Inverter Station accesses same ac bus.
4. a kind of control method for reducing direct current transportation commutation failure probability as described in claim 1, it is characterised in that: if
The position of the THE UPFC arrangement is adjacent with the Inverter Station of the DC transmission system, then the alternating current of the setting
The exchange that the three-phase AC line that pressure minimum Ubus_Lim is sealed in by THE UPFC series transformer split-phase connects
The minimum of busbar voltage.
5. a kind of control method for reducing direct current transportation commutation failure probability as described in claim 1, it is characterised in that: described
The ac bus of THE UPFC shunt transformer access is the three-phase AC line that the series transformer split-phase seals in
Other ac bus of the ac bus or the AC transmission system that are connected.
6. a kind of control method for reducing direct current transportation commutation failure probability as claimed in claim 5, it is characterised in that: if
The ac bus of the THE UPFC shunt transformer access is the three-phase alternating current that the series transformer split-phase seals in
The ac bus that route is connected then sets another voltage-operated minimum Ubus_low of ac bus, the friendship
The minimum Ubus_low for flowing busbar voltage operation is greater than Ubus_Lim；
In these cases, line power control model, the reduction are operated in the series side of the THE UPFC
Also increase preposition coordinated control step, the preposition association before the implementation steps of the control method of direct current transportation commutation failure probability
Adjust rate-determining steps include:
A) after the voltage for detecting ac bus minimum Ubus_low voltage-operated lower than above-mentioned ac bus, institute
The side in parallel for stating THE UPFC controls rapidly the reactive power for increasing and injecting the ac bus, to maintain exchange female
Line voltage reduces the probability that commutation failure occurs for DC transmission system；
B) it is lower than Ubus_low when the voltage for detecting the ac bus cannot still be maintained at above-mentioned alternating voltage minimum
Afterwards, the reactive power that the ac bus is injected in the side in parallel of the THE UPFC remains its maximum output value.
7. a kind of control method for reducing direct current transportation commutation failure probability as described in claim 1, it is characterised in that: described
THE UPFC parallel connection side when breaking down, the series connection inverter of series side can isolated operation, it is corresponding reduce it is straight
The control method of stream transmission of electricity commutation failure probability are as follows:
1) series side of above-mentioned THE UPFC operates in line power control model, DC power transmission system described in real-time detection
The alternating voltage for Inverter Station of uniting, and set an above-mentioned alternating voltage minimum Ubus_ when line power control model operation
Lim；
2) it is lower than above-mentioned alternating voltage minimum Ubus_Lim in the alternating voltage for detecting the DC transmission system Inverter Station
Afterwards, by the series side control model of THE UPFC from line power control mode switch be constant impedance control model；
3) series side one reactance of equivalent injection of above-mentioned THE UPFC, equivalent raising THE UPFC note are controlled
Enter the electrical distance of route, to improve the voltage of THE UPFC access ac bus, maintains DC transmission system inverse
Become the alternating voltage at station in above-mentioned alternating voltage minimum Ubus_Lim, reduces the machine that commutation failure occurs for DC transmission system
Rate；
It 4), will when the alternating voltage for detecting DC transmission system Inverter Station is greater than above-mentioned alternating voltage minimum Ubus_Lim
The series side control model of THE UPFC from constant impedance control mode switch be line power control model.
8. a kind of control method for reducing direct current transportation commutation failure probability as described in claim 1, it is characterised in that: such as institute
The route for stating the control of THE UPFC series side is double-circuit line, and at least a set of string of configuration is required on the double-circuit line
Join the series connection inverter and series transformer of side.
9. a kind of control method for reducing direct current transportation commutation failure probability as claimed in claim 8, it is characterised in that: described
Double-circuit line is identical in the alternating voltage minimum Ubus_Lim of power control operational mode, is detecting the DC power transmission system
For the alternating voltage for Inverter Station of uniting lower than after above-mentioned alternating voltage minimum Ubus_Lim, the series side of the double-circuit line controls mould
Formula is required to from line power control mode switch be injecting voltage control model.
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| CN108110783B (en) * | 2017-12-28 | 2021-05-14 | 国家电网公司 | Method and device for coordination control between synchronous phase modulator and LCC-HVDC |
| CN108616136B (en) * | 2018-04-10 | 2020-07-28 | 华南理工大学 | Current type high-voltage direct-current power transmission system commutation failure suppression method based on series voltage injection |
| CN113472000B (en) * | 2021-08-02 | 2022-08-30 | 国网河南省电力公司电力科学研究院 | Commutation failure control method for multi-feed-in direct current transmission system |
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