CN111371077B - Protection control method suitable for elastic intelligent power distribution network with multiple fault types - Google Patents
Protection control method suitable for elastic intelligent power distribution network with multiple fault types Download PDFInfo
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- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
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Abstract
The protection control method is suitable for elastic intelligent power distribution networks with various fault types, current mutation amount detection is carried out on a main network side and a distributed power supply side of a distribution line, once the current is found to be changed greatly, a distribution line protection device is started, and meanwhile, starting signals are sent to all protection devices on the downstream of a subsection line; acquiring power frequency split-phase total current amplitudes of a main network side and a distributed power supply side of a distribution line, substituting the power frequency split-phase total current amplitudes into a fault current comparison criterion to judge the fault type, and tripping off switches on two sides of a fault line if the line current is zero to prove that a line break fault occurs; if the line current has overcurrent to prove that short-circuit fault occurs, if the power frequency split-phase total current amplitude meets the amplitude difference comparison criterion, protecting the action and tripping the circuit breakers on the two sides; the influence of multiple fault types on the protection of the power distribution network in extreme weather is solved, and the elasticity of the intelligent power distribution network in extreme weather is improved.
Description
Technical Field
The disclosure relates to the technical field of elastic intelligent power distribution network protection, in particular to a protection control method applicable to elastic intelligent power distribution networks with multiple fault types.
Background
The statements in this section merely provide background information related to the present disclosure and may not necessarily constitute prior art.
In recent years, due to global climate change and global warming, outbreaks of extreme weather such as hurricanes, ice storms, etc. have been increasingly frequent and their intensity has been increasing. The large-scale power failure accidents caused by extreme weather are continuously generated in the world, thereby bringing huge economic loss. In recent years, with the access of distributed power sources and large-scale construction and transformation, intelligent power distribution networks have been developed greatly. As an electric power system directly connected with users, the normal operation of a power distribution network in extreme weather has important significance for people's life and social production. In order to evaluate the disaster coping capability of the power distribution network, scholars at home and abroad put forward an elastic concept, namely the capability of preventing and resisting disturbance, bearing disturbance and recovering power supply after disturbance.
The inventor of the present disclosure finds that, in order to narrow the large-scale power outage range caused by extreme weather and reduce the loss caused by the large-scale power outage, it is necessary to take corresponding measures to improve the elasticity of the power distribution network. At present, certain research on improving the elasticity of the power distribution network in extreme weather has been developed at home and abroad. However, at present, research on elastic lifting measures of the power distribution network mainly focuses on strategies of equipment underground treatment, power distribution network element reinforcement, power supply recovery capacity improvement and the like, and research on protection of the elastic intelligent power distribution network in extreme weather is lacked. The distribution network faults caused by extreme weather are different from the traditional distribution network faults, the probability of occurrence of disconnection faults of the distribution network under the extreme weather is greatly increased, the situation of complex multiple fault faults is complex mostly, the disconnection faults increase the complexity of the faults, and challenges are brought to the realization of protection reliability, rapidity, selectivity and sensitivity. The existing power distribution network protection can only deal with short-circuit faults, cannot judge and isolate disconnection faults, and can only depend on modes such as user feedback and manual line patrol, so that the elasticity of the power distribution network is greatly reduced.
Disclosure of Invention
In order to solve the defects of the prior art, the protection control method for the elastic intelligent power distribution network applicable to multiple fault types is provided, short-circuit faults can be detected and isolated, disconnection faults can be processed, only current amplitude data are needed, requirements for data synchronization are low, a voltage transformer is not needed, the influence of multiple fault types on power distribution network protection in extreme weather is avoided, and the elasticity of the intelligent power distribution network in extreme weather is improved.
In order to achieve the purpose, the following technical scheme is adopted in the disclosure:
the first aspect of the disclosure provides a protection control method applicable to elastic intelligent power distribution networks with multiple fault types.
A protection control method suitable for an elastic intelligent power distribution network with multiple fault types comprises the following steps:
obtaining current mutation detection quantity of a main network side and a distributed power supply side of a distribution line;
when the current is found to be changed greatly, starting the distribution line protection device, and simultaneously sending starting signals to all protection devices at the downstream of the segmented line;
acquiring power frequency split-phase total current amplitudes of a main network side and a distributed power supply side of a distribution line, substituting the power frequency split-phase total current amplitudes into a fault current comparison criterion to judge the fault type, and judging whether the fault is a short-circuit fault or a broken line fault;
if the line current is zero, the line breaking fault is proved to occur, a fault section is determined according to the condition that the fault line current is zero and the non-fault line current is not zero, and switches on two sides of the fault line are tripped;
if the line current is over-current, the short-circuit fault is proved, and if the power frequency split-phase total current amplitude meets the amplitude difference comparison criterion, the circuit breakers on the two sides are tripped out by protection actions.
And as some possible implementation modes, comparing the extracted power frequency split-phase total current amplitude with a fault current setting value, and judging whether the fault is a broken line or a short-circuit fault.
As some possible implementations, the fault current comparison criterion is specifically:
wherein the content of the first and second substances,
is a current setting value close to zero,
for the current data of the adjacent protection of the faulty line,
representing A, B, C three phases, Isets＝KrelIL.maxSetting by avoiding the maximum load current, KrelThe value range is 1.15-1.25 for reliable coefficient.
As some possible implementations, if it is a line break fault, the protection device detects a current break amount of a certain line, compares the current flowing through the line with the current of the protection device adjacent to the line, if it is detected that a certain phase current of the line in the current segment is zero and the adjacent protection device still has a current flowing through it, it is determined that the circuit breakers on both sides of the line in the current segment have a fault, and if it is detected that the certain phase currents of the line in the current segment and the adjacent protection device are all zero, the detection is continued.
As possible implementation manners, if the power frequency split-phase total current amplitude meets the amplitude difference comparison criterion, as long as one phase meets the amplitude comparison action condition, the action is protected, and the circuit breakers on the two sides are tripped.
As some possible implementations, the amplitude difference comparison criterion is specifically:
η＝(1-εmax)
in the formula (I), the compound is shown in the specification,
the branch phase current amplitude value of the main network side is obtained;
the amplitude of the split-phase current at the side of the distributed power supply is obtained;
for the larger phase-splitting electricity in the current on both sides of the lineA flow amplitude;
the amplitude of the split-phase current is smaller in the currents at two sides of the line; rho is the split-phase current amplitude ratio of two sides of the distribution line; eta is an amplitude ratio threshold value; and epsilon is the transmission error of the mutual inductor.
A second aspect of the present disclosure provides a protection control system for a resilient smart distribution network for multiple fault types.
A protection control system for a resilient smart distribution network for multiple fault types, comprising:
a data acquisition module configured to: obtaining current mutation detection quantity of a main network side and a distributed power supply side of a distribution line;
a current determination module configured to: when the current is found to be changed greatly, starting the distribution line protection device, and simultaneously sending starting signals to all protection devices at the downstream of the segmented line;
a fault type determination module configured to: acquiring power frequency split-phase total current amplitudes of a main network side and a distributed power supply side of a distribution line, substituting the power frequency split-phase total current amplitudes into a fault current comparison criterion to judge the fault type, and judging whether the fault is a short-circuit fault or a broken line fault;
a disconnection fault control module configured to: if the line current is zero, the line breaking fault is proved to occur, a fault section is determined according to the condition that the fault line current is zero and the non-fault line current is not zero, and switches on two sides of the fault line are tripped;
a short-circuit fault generation control module configured to: if the line current is over-current, the short-circuit fault is proved, and if the power frequency split-phase total current amplitude meets the amplitude difference comparison criterion, the circuit breakers on the two sides are tripped out by protection actions.
A third aspect of the present disclosure provides a medium having a program stored thereon, the program implementing, when executed by a processor, the steps in the protection control method for a resilient smart distribution network applicable to a plurality of fault types according to the first aspect of the present disclosure.
A fourth aspect of the present disclosure provides an electronic device, which includes a memory, a processor, and a program stored in the memory and executable on the processor, and when the processor executes the program, the processor implements the steps in the protection control method for the flexible intelligent power distribution network applicable to multiple fault types according to the first aspect of the present disclosure.
Compared with the prior art, the beneficial effect of this disclosure is:
1. the content disclosed by the disclosure not only can detect and isolate short-circuit faults, but also can process disconnection faults, only needs current amplitude data, has low requirement on data synchronization, does not need a voltage transformer, solves the influence of various fault types on the protection of the power distribution network in extreme weather, and improves the elasticity of the intelligent power distribution network in extreme weather.
2. The intelligent power distribution network fault isolation method and system can effectively isolate fault points when the power distribution network has short circuit and disconnection faults, reduce the power failure range and effectively improve the elasticity of the intelligent power distribution network.
3. This is disclosed when considering intelligent power distribution network short circuit fault, fault line distributed power source side fault current probably appears weak presenting the phenomenon and leads to overflowing the detection and can't start, does not have weak presenting the phenomenon with one side of major network connection, consequently detects the current sudden change when certain one side line current sudden change, not only starts this side line protection device but also sends the start signal to the opposite side circuit, very big improvement the control accuracy and the stability of system, prevent the situation that protection device can't start.
Drawings
Fig. 1 is a schematic flowchart of a protection control method applicable to an elastic smart distribution network with multiple fault types according to embodiment 1 of the present disclosure.
Fig. 2 is a schematic diagram of a fault of a distribution line provided in embodiment 1 of the present disclosure.
Detailed Description
It should be noted that the following detailed description is exemplary and is intended to provide further explanation of the disclosure. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this disclosure belongs.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments according to the present disclosure. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof, unless the context clearly indicates otherwise.
The embodiments and features of the embodiments in the present disclosure may be combined with each other without conflict.
Example 1:
as shown in fig. 1, an embodiment 1 of the present disclosure provides a protection control method for an elastic smart distribution network applicable to multiple fault types, including the following steps:
step 1: carrying out current mutation detection on the main network side and the distributed power supply side of the distribution line;
step 2: and starting the protection device of the distribution line once the sudden change of the current is found, and simultaneously sending a starting signal to all protection devices downstream of the subsection line.
Considering that when the smart distribution network has a short-circuit fault, as shown in point f1 in fig. 2, a fault current at the distributed power supply side of a fault line may have a weak feedback phenomenon, which results in that overcurrent detection cannot be started, and one side connected with a main line does not have the weak feedback phenomenon, when a line current mutation at a certain side detects a current mutation, not only the line protection device at the side is started, but also a start signal is sent to a line at the other side.
And step 3: each protection device obtains power frequency split-phase full current amplitudes of a main network side and a distributed power supply side of a distribution line through communication;
and 4, step 4: and comparing the extracted power frequency split-phase total current amplitude with a fault current setting value, and judging whether the fault is a broken line or a short-circuit fault. If the protection detects that a certain phase current is zero, the disconnection fault is generated; if the protection detects that a certain phase current is over-current, it indicates that a short-circuit fault occurs.
And 5: if the fault is a disconnection fault, taking a fault at a point f1 as an example, the protection at K3 and K4 detects that the abrupt change quantity starts to compare the current flowing through the K3-K4 line and the current of the adjacent protection (the current flowing through K2 and the current flowing through K5), and if the current of a certain phase of the line in the section is detected to be zero and the current of the adjacent protection flows according to the current, the circuit breakers at two sides of the line in the section with the fault are determined to trip; if the current phase of the current section of the circuit and the adjacent protection thereof is detected to be zero, the detection is continued. If the fault is a short-circuit fault, substituting the fault into an amplitude difference comparison criterion for fault judgment, and if the power frequency split-phase full current amplitude meets the amplitude difference comparison criterion, namely protecting the action as long as one phase meets the amplitude comparison action condition, and tripping the circuit breakers on the two sides.
The fault current comparison criterion expression is as follows:
wherein the content of the first and second substances,
a very small current setting value close to 0;
for the current data of the adjacent protection of the faulty line,
representing A, B, C three phases;
Isets＝KrelIL.max
setting by avoiding the maximum load current, KrelThe reliability coefficient is 1.15-1.25;
the expression of the amplitude difference comparison criterion is as follows:
η＝(1-εmax)
wherein the content of the first and second substances,
the branch phase current amplitude value of the main network side is obtained;
the amplitude of the split-phase current at the side of the distributed power supply is obtained;
the amplitude of the split-phase current is larger in the currents at two sides of the line;
the amplitude of the split-phase current is smaller in the currents at two sides of the line; rho is the split-phase current amplitude ratio of two sides of the distribution line; eta is an amplitude ratio threshold value; and epsilon is the transmission error of the mutual inductor.
The protection control method provided by the embodiment can effectively isolate fault points when the power distribution network has short circuit and disconnection faults, reduces the power failure range, and can effectively improve the elasticity of the intelligent power distribution network.
Example 2:
the embodiment 2 of the present disclosure provides a protection control system suitable for an elastic intelligent power distribution network with multiple fault types, including:
a data acquisition module configured to: obtaining current mutation detection quantity of a main network side and a distributed power supply side of a distribution line;
a current determination module configured to: when the current is found to be changed greatly, starting the distribution line protection device, and simultaneously sending starting signals to all protection devices at the downstream of the segmented line;
a fault type determination module configured to: acquiring power frequency split-phase total current amplitudes of a main network side and a distributed power supply side of a distribution line, substituting the power frequency split-phase total current amplitudes into a fault current comparison criterion to judge the fault type, and judging whether the fault is a short-circuit fault or a broken line fault;
a disconnection fault control module configured to: if the line current is zero, the line breaking fault is proved to occur, a fault section is determined according to the condition that the fault line current is zero and the non-fault line current is not zero, and switches on two sides of the fault line are tripped;
a short-circuit fault generation control module configured to: if the line current is over-current, the short-circuit fault is proved, if the amplitude of the power frequency split-phase total current meets the amplitude difference comparison criterion, if one phase meets the amplitude comparison action condition, the circuit breakers on two sides are tripped out by protection action.
Comparing the extracted power frequency split-phase total current amplitude with a fault current setting value, and judging whether the fault is a broken line or a short-circuit fault;
the specific fault current comparison criterion is as follows:
wherein the content of the first and second substances,
is a current setting value close to zero,
for the current data of the adjacent protection of the faulty line,
representing A, B, C three phases, Isets＝KrelIL.maxSetting by avoiding the maximum load current, Krel is a reliable coefficient, and the value range is 1.15-1.25;
if the line is broken, the protection device detects the current break amount of a certain line, the current flowing through the line is compared with the current of the protection device adjacent to the line, if the current of the certain phase of the line in the section is detected to be zero and the current of the adjacent protection device still flows, the circuit breakers at two sides of the line with the fault in the section are determined to be tripped, and if the current of the certain phase of the line in the section and the current of the adjacent protection device are detected to be zero, the detection is continued.
The amplitude difference comparison criterion specifically comprises the following steps:
η＝(1-εmax)
in the formula (I), the compound is shown in the specification,
the branch phase current amplitude value of the main network side is obtained;
the amplitude of the split-phase current at the side of the distributed power supply is obtained;
for larger amplitude of split-phase current in currents on both sides of the line
The amplitude of the split-phase current is smaller in the currents at two sides of the line; rho is the split-phase current amplitude ratio of two sides of the distribution line; eta is an amplitude ratio threshold value; and epsilon is the transmission error of the mutual inductor.
Example 3:
the embodiment 3 of the present disclosure provides a medium on which a program is stored, and the program implements, when being executed by a processor, the steps in the protection control method for the flexible intelligent distribution network applicable to multiple fault types according to the embodiment 1 of the present disclosure.
Example 4:
a fourth aspect of the present disclosure provides an electronic device, which includes a memory, a processor, and a program stored in the memory and executable on the processor, and when the processor executes the program, the processor implements the steps in the protection control method for the flexible intelligent power distribution network applicable to multiple fault types according to embodiment 1 of the present disclosure.
The above description is only a preferred embodiment of the present disclosure and is not intended to limit the present disclosure, and various modifications and changes may be made to the present disclosure by those skilled in the art. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present disclosure should be included in the protection scope of the present disclosure.
Claims (9)
1. A protection control method suitable for an elastic intelligent power distribution network with multiple fault types is characterized by comprising the following steps:
obtaining current mutation detection quantities of a main network side and a distributed power supply side of a distribution line;
when the current is found to be changed greatly, starting the distribution line protection device, and simultaneously sending starting signals to all protection devices at the downstream of the segmented line;
acquiring power frequency split-phase total current amplitudes of a main network side and a distributed power supply side of a distribution line, substituting the power frequency split-phase total current amplitudes into a fault current comparison criterion to judge the fault type, and judging whether the fault is a short-circuit fault or a broken line fault;
if the line current is zero, the line breaking fault is proved to occur, a fault section is determined according to the condition that the fault line current is zero and the non-fault line current is not zero, and switches on two sides of the fault line are tripped;
if the line current has overcurrent to prove that short-circuit fault occurs, if the power frequency split-phase total current amplitude meets the amplitude difference comparison criterion, protecting the action and tripping the circuit breakers on the two sides; the amplitude difference comparison criterion specifically comprises the following steps:
η＝(1-εmax)
in the formula (I), the compound is shown in the specification,
the branch phase current amplitude value of the main network side is obtained;
the amplitude of the split-phase current at the side of the distributed power supply is obtained;
the amplitude of the split-phase current is larger in the currents at two sides of the line;
the amplitude of the split-phase current is smaller in the currents at two sides of the line; rho is the distribution line two-side branchPhase current amplitude ratio; eta is an amplitude ratio threshold value; and epsilon is the transmission error of the mutual inductor.
2. The protection control method for the elastic intelligent power distribution network with multiple fault types according to claim 1, wherein the extracted power frequency split-phase full current amplitude is compared with a fault current setting value to judge whether the fault is a broken line or a short circuit fault.
3. The protection control method applicable to the elastic intelligent power distribution network with multiple fault types according to claim 1, wherein the fault current comparison criterion is specifically:
wherein the content of the first and second substances,
is a current setting value close to zero,
for the current data of the adjacent protection of the faulty line,
representing A, B, C three phases, Isets＝KrelIL.maxSetting by avoiding the maximum load current, KrelThe value range is 1.15-1.25 for reliable coefficient.
4. The method as claimed in claim 1, wherein if the fault is a disconnection fault, the protection device detects a sudden change of current in a line, compares the current flowing through the line with the current flowing through the protection device adjacent to the line, determines that the circuit breaker on both sides of the fault occurs in the line if a current of the line on the current section is zero and a current of the adjacent protection device still flows through the adjacent protection device, and continues the detection if the current of the line on the current section and the adjacent protection device is zero.
5. The protection control method suitable for the elastic intelligent power distribution network with multiple fault types according to claim 1, wherein if the amplitude of the power frequency split-phase total current meets the amplitude difference comparison criterion, if one phase meets the amplitude comparison action condition, the protection action is carried out, and the circuit breakers on two sides are tripped.
6. A protection control system suitable for a flexible intelligent power distribution network with multiple fault types is characterized by comprising:
a data acquisition module configured to: obtaining current mutation detection quantities of a main network side and a distributed power supply side of a distribution line;
a current determination module configured to: when the current is found to be changed greatly, starting the distribution line protection device, and simultaneously sending starting signals to all protection devices at the downstream of the segmented line;
a fault type determination module configured to: acquiring power frequency split-phase total current amplitudes of a main network side and a distributed power supply side of a distribution line, substituting the power frequency split-phase total current amplitudes into a fault current comparison criterion to judge the fault type, and judging whether the fault is a short-circuit fault or a broken line fault;
a disconnection fault control module configured to: if the line current is zero, the line breaking fault is proved to occur, a fault section is determined according to the condition that the fault line current is zero and the non-fault line current is not zero, and switches on two sides of the fault line are tripped;
a short-circuit fault control module configured to: if the line current has overcurrent to prove that short-circuit fault occurs, if the power frequency split-phase total current amplitude meets the amplitude difference comparison criterion, protecting the action and tripping the circuit breakers on the two sides; the amplitude difference comparison criterion specifically comprises the following steps:
η＝(1-εmax)
in the formula (I), the compound is shown in the specification,
the branch phase current amplitude value of the main network side is obtained;
the amplitude of the split-phase current at the side of the distributed power supply is obtained;
the amplitude of the split-phase current is larger in the currents at two sides of the line;
the amplitude of the split-phase current is smaller in the currents at two sides of the line; rho is the split-phase current amplitude ratio of two sides of the distribution line; eta is an amplitude ratio threshold value; and epsilon is the transmission error of the mutual inductor.
7. The protection control system applicable to the elastic intelligent power distribution network with multiple fault types according to claim 6, wherein the extracted power frequency split-phase full current amplitude is compared with a fault current setting value to judge whether the fault is a broken line or a short-circuit fault;
the fault current comparison criterion specifically comprises the following steps:
wherein the content of the first and second substances,
is a current setting value close to zero,
for the current data of the adjacent protection of the faulty line,
representing A, B, C three phases, Isets＝KrelIL.maxSetting by avoiding the maximum load current, KrelThe value range is 1.15-1.25;
if the line is broken, the protection device detects the current break amount of a certain line, the current flowing through the line is compared with the current of the protection device adjacent to the line, if the current of the certain phase of the line in the section is detected to be zero and the current of the adjacent protection device still flows through the adjacent protection device, the circuit breakers at two sides of the line with the fault in the section are determined to trip, and if the current of the certain phase of the line in the section and the current of the adjacent protection device are detected to be zero, the detection is continued;
if the power frequency split-phase total current amplitude meets the amplitude difference comparison criterion, protecting the action and tripping the circuit breakers on the two sides as long as one phase meets the amplitude comparison action condition;
the amplitude difference comparison criterion specifically comprises the following steps:
η＝(1-εmax)
in the formula (I), the compound is shown in the specification,
the branch phase current amplitude value of the main network side is obtained;
the amplitude of the split-phase current at the side of the distributed power supply is obtained;
the amplitude of the split-phase current is larger in the currents at two sides of the line;
the amplitude of the split-phase current is smaller in the currents at two sides of the line; rho is the split-phase current amplitude ratio of two sides of the distribution line; eta is an amplitude ratio threshold value; and epsilon is the transmission error of the mutual inductor.
8. A medium having a program stored thereon, wherein the program, when executed by a processor, implements the steps in the protection control method for a resilient smart distribution network for multiple fault types according to any one of claims 1 to 5.
9. An electronic device comprising a memory, a processor and a program stored on the memory and executable on the processor, wherein the processor executes the program to implement the steps of the method for protection control of a resilient smart distribution network for multiple fault types according to any one of claims 1 to 5.
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| CN113067315B (en) * | 2021-03-09 | 2022-08-05 | 国网江苏省电力有限公司无锡供电分公司 | Power distribution network line protection method based on opposite-end multi-type digital overcurrent signals |
| CN114640093B (en) * | 2022-02-23 | 2023-03-24 | 北京天能继保电力科技有限公司 | Method and device for protecting broken line of distributed power transmission and distribution line |
| CN115498593B (en) * | 2022-11-11 | 2023-04-28 | 浙江万胜智能科技股份有限公司 | Control method and system of intelligent electricity utilization multiple protector |
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