CN114172130A - Domain relay protection method for power distribution network and related device - Google Patents
Domain relay protection method for power distribution network and related device Download PDFInfo
- Publication number
- CN114172130A CN114172130A CN202111495995.XA CN202111495995A CN114172130A CN 114172130 A CN114172130 A CN 114172130A CN 202111495995 A CN202111495995 A CN 202111495995A CN 114172130 A CN114172130 A CN 114172130A
- Authority
- CN
- China
- Prior art keywords
- fault
- information
- protection
- station
- distribution network
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 238000000034 method Methods 0.000 title claims abstract description 43
- 238000002955 isolation Methods 0.000 claims abstract description 45
- 238000012545 processing Methods 0.000 claims abstract description 15
- 238000004458 analytical method Methods 0.000 claims abstract description 11
- 241000272814 Anser sp. Species 0.000 claims description 23
- 238000004891 communication Methods 0.000 claims description 13
- 238000001514 detection method Methods 0.000 claims description 9
- 230000002159 abnormal effect Effects 0.000 claims description 8
- 230000009471 action Effects 0.000 abstract description 12
- 230000007246 mechanism Effects 0.000 abstract description 12
- 230000016507 interphase Effects 0.000 description 6
- 238000005516 engineering process Methods 0.000 description 5
- 230000006870 function Effects 0.000 description 5
- 238000012360 testing method Methods 0.000 description 5
- 230000005540 biological transmission Effects 0.000 description 3
- 238000004422 calculation algorithm Methods 0.000 description 3
- 230000008878 coupling Effects 0.000 description 3
- 238000010168 coupling process Methods 0.000 description 3
- 238000005859 coupling reaction Methods 0.000 description 3
- 230000003068 static effect Effects 0.000 description 3
- 238000011161 development Methods 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 238000011144 upstream manufacturing Methods 0.000 description 2
- 206010000369 Accident Diseases 0.000 description 1
- 101150109818 STU1 gene Proteins 0.000 description 1
- 101100204269 Saccharomyces cerevisiae (strain ATCC 204508 / S288c) STU2 gene Proteins 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012806 monitoring device Methods 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 230000035772 mutation Effects 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 239000013307 optical fiber Substances 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
- 238000004088 simulation Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
- 238000012795 verification Methods 0.000 description 1
Images
Classifications
-
- 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
-
- 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
- H02H7/28—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 for meshed systems
Landscapes
- Remote Monitoring And Control Of Power-Distribution Networks (AREA)
Abstract
The application discloses a power distribution website domain type relay protection method and a related device, wherein the method comprises the following steps: acquiring fault information of an out-station line of the power distribution network through an intelligent feeder terminal, and acquiring electrical quantity information of an in-station outgoing line by using an information acquisition module; processing and analyzing the electrical quantity information, and determining a fault section positioning result by comprehensively judging fault information and protection application topology information; and sending a sectional fault isolation instruction through the station-domain protection device based on the fault information, the preset time range and the fault section positioning result. The flexibility and the reliability of the protection system are improved through rapid fault analysis positioning and a station domain type protection mechanism; the trip protection is carried out without a large-scale or step-by-step matching mode, and the integral performance of the in-station protection can be improved by adopting the station domain type protection. The method and the device solve the technical problem that the existing protection mechanism cannot effectively balance selectivity and quick action, so that the protection mechanism of the system is lack of flexibility and reliability.
Description
Technical Field
The application relates to the technical field of power distribution network relay protection, in particular to a power distribution network domain type relay protection method and a related device.
Background
The urban distribution network in China forms a multi-section multi-contact grid structure among lines, and the power supply quality and the power supply reliability can be guaranteed to the greatest extent by flexibly changing the operation mode of the distribution network. However, as the distribution line is short, the number of the section switches and the number of the cascade switches are large, the short-circuit current level difference of each measuring point is small when the line fails, the protection setting matching is difficult, and the problems of step-by-step tripping, long action time and the like often occur depending on the current fixed value and time limit matching, so that the mean fault removal time of the distribution network is prolonged, and the power failure range is enlarged. And aiming at the high-resistance grounding fault of a small-resistance grounding power distribution system, the fault information is weak, the fault detection is difficult, the protection is refused to operate, and the personal electric shock or fire accident is easily caused.
At present, the traditional concept of gradual matching is still used in the aspects of basic principles, setting, configuration schemes and the like of power distribution network line protection. The upper and lower protection devices are matched through current fixed value and action time limit only by using local current measurement information, and the selectivity and the rapidity of protection action are hardly considered. Along with the development and the requirement of an urban power distribution network, the self-healing capacity of a power grid is continuously improved, the operation mode of the system is more flexible and changeable, and the relay protection problem is more prominent.
In order to improve the relay protection performance of a power distribution network, the conventional research idea is mainly carried out from three aspects. Firstly, the fault point is accurately positioned to replace the traditional step-by-step matching method to obtain selectivity, so that the fault can be isolated in the minimum range, for example, the distributed protection principle based on the fault-related area self-adaptive division. The protection device can be used for centralized judgment after obtaining fault current data in a fault related area, and meanwhile, the selectivity and the quick action performance of protection are achieved. However, the method is limited to theoretical analysis and simple experimental verification, and the integrity and field applicability of the protection strategy need to be further researched by combining with engineering practice; secondly, the fast main protection of the feeder line is realized, and any fault can be fast removed. For example, a wide-area differential protection algorithm mainly divides an associated domain of each Intelligent power monitoring Device (IED), and differential protection can be provided for different areas by performing current differential calculation between a certain IED and different IEDs. Aiming at the increase of the complexity of the power distribution network and the access of a distributed power supply, a power distribution network centralized differential protection method based on generalized nodes is further provided, and the concept of the generalized nodes is applied according to the real-time structure of the power distribution network and the measurement availability change condition to determine the minimum differential interval of the differential protection to realize the protection. However, the current differential protection is affected by unbalanced current, transition resistance and the like, the sensitivity is low, and the reliability of the protection completely depends on the communication technology; and thirdly, based on the robust communication system architecture and the multi-Agent technology supported by the advanced computer technology, the station area protection is realized, and the relay protection function is provided for the total station equipment by utilizing local information. The method not only improves the overall performance of protection in the substation, but also enables the coordination between the protection to be more flexible, obviously enhances the fault-tolerant capability, and is only used as backup protection for each device in the substation at present.
Disclosure of Invention
The application provides a distribution network domain type relay protection method and a related device, which are used for solving the technical problem that the existing protection mechanism cannot effectively balance selectivity and quick action, so that the protection mechanism of a system is lack of flexibility and reliability.
In view of this, a first aspect of the present application provides a power distribution network domain relay protection method, including:
the method comprises the steps that fault information of an out-of-station line of a power distribution network is obtained through an intelligent feeder terminal, and meanwhile, electric quantity information of an in-station outgoing line is obtained through an information acquisition module, wherein the fault information comprises a GOOSE message, and the electric quantity information comprises phase current and zero sequence current;
processing and analyzing the electrical quantity information, and comprehensively judging by combining the fault information and the protection application topology information to determine a fault section positioning result;
and sending a sectional type fault isolation instruction through a station domain type protection device based on the fault information, a preset time range and the fault section positioning result, wherein the fault isolation instruction comprises tripping operation.
Preferably, the processing and analyzing the electrical quantity information, and determining a fault section positioning result by combining the fault information and the protection application topology information, includes:
receiving and analyzing topology information issued by a master station to obtain the protection application topology information;
if the phase current and the zero sequence current in the electrical quantity information are larger than a preset maximum current, determining that a line fault exists;
and analyzing messages of the GOOSE messages of the fault information corresponding to the line faults, and determining the positioning result of the fault section with the line faults by combining the line faults and the protection application topology information.
Preferably, based on the fault information, the preset time range and the fault section positioning result, sending a section-type fault isolation instruction through a station-area protection device, where the fault isolation instruction includes a trip operation, and includes:
and when the station domain type protection device continuously receives the fault information and exceeds a preset time range, comprehensively sending a sectional type fault isolation instruction by combining all the fault information and the fault section positioning results, wherein the fault isolation instruction comprises tripping operation.
Preferably, based on the fault information, the preset time range and the fault section positioning result, sending a section-type fault isolation instruction through a station-area protection device, where the fault isolation instruction includes a trip operation, and further including:
and when the communication is abnormal, carrying out the backup protection of the feeder line through the local relay protection device of the intelligent feeder line terminal.
The second aspect of the present application provides a power distribution network domain relay protection device, including:
the system comprises an information acquisition module, a fault detection module and a fault detection module, wherein the information acquisition module is used for acquiring fault information of an out-of-station line of the power distribution network through an intelligent feeder terminal and acquiring electric quantity information of an in-station outgoing line by using an information acquisition module, the fault information comprises a GOOSE message, and the electric quantity information comprises phase current and zero sequence current;
the fault analysis module is used for processing and analyzing the electrical quantity information, comprehensively judging by combining the fault information and the protection application topology information, and determining a fault section positioning result;
and the station domain protection module is used for sending a sectional type fault isolation instruction through a station domain type protection device based on the fault information, the preset time range and the fault section positioning result, wherein the fault isolation instruction comprises tripping operation.
Preferably, the fault analysis module is specifically configured to:
receiving and analyzing topology information issued by a master station to obtain the protection application topology information;
if the phase current and the zero sequence current in the electrical quantity information are larger than a preset maximum current, determining that a line fault exists;
and analyzing messages of the GOOSE messages of the fault information corresponding to the line faults, and determining the positioning result of the fault section with the line faults by combining the line faults and the protection application topology information.
Preferably, the station domain protection module is specifically configured to:
and when the station domain type protection device continuously receives the fault information and exceeds a preset time range, comprehensively sending a sectional type fault isolation instruction by combining all the fault information and the fault section positioning results, wherein the fault isolation instruction comprises tripping operation.
Preferably, the method further comprises the following steps:
and the backup protection module is used for carrying out the backup protection of the feeder line through the local relay protection device of the intelligent feeder line terminal when the communication is abnormal.
The third aspect of the application provides a power distribution website domain type relay protection device, which comprises a processor and a memory;
the memory is used for storing program codes and transmitting the program codes to the processor;
the processor is configured to execute the power distribution network regional relay protection method according to the instruction in the program code.
A fourth aspect of the present application provides a computer-readable storage medium, which is configured to store program codes, where the program codes are configured to execute the power distribution network domain relay protection method according to the first aspect.
According to the technical scheme, the embodiment of the application has the following advantages:
the application provides a power distribution website domain type relay protection method, which comprises the following steps: the method comprises the steps that fault information of an out-of-station line of a power distribution network is obtained through an intelligent feeder terminal, and meanwhile, electric quantity information of an in-station outgoing line is obtained through an information acquisition module, wherein the fault information comprises a GOOSE message, and the electric quantity information comprises phase current and zero sequence current; processing and analyzing the electrical quantity information, and comprehensively judging by combining the fault information and the protection application topology information to determine a fault section positioning result; and sending a sectional type fault isolation instruction through a station domain type protection device based on the fault information, a preset time range and the fault section positioning result, wherein the fault isolation instruction comprises tripping operation.
According to the power distribution website domain type relay protection method, the flexibility and the reliability of a protection system are improved through rapid fault analysis positioning and a domain type protection mechanism; the method comprises the steps that not only electric quantity information of outgoing lines in a station is obtained, but also fault information of lines outside the station is obtained, fault sections are accurately judged based on the information inside and outside the station, and then a station domain type protection device is adopted to send fault isolation instructions with high pertinence according to the fault sections, so that tripping isolation is achieved; trip protection is carried out in a large-scale or step-by-step matching mode, so that the system is quicker and more efficient; not only can the selectivity be ensured, but also the rapidity can be considered; and the integral performance of protection in the station can be improved by adopting the station domain type protection, the cooperation is more flexible, and the fault tolerance rate can be improved. Therefore, the method and the device can solve the technical problem that the existing protection mechanism cannot effectively balance selectivity and quick action performance, so that the protection mechanism of the system is lack of flexibility and reliability.
Drawings
Fig. 1 is a schematic flowchart of a power distribution network domain relay protection method according to an embodiment of the present disclosure;
fig. 2 is a schematic structural diagram of a power distribution network domain type relay protection device according to an embodiment of the present application;
fig. 3 is a schematic view of a topology structure of a fault section of a local power distribution network according to an embodiment of the present application;
fig. 4 is a schematic view of a topology structure of a static simulation system of an active power distribution network provided in this application example.
Detailed Description
In order to make the technical solutions of the present application better understood, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
For easy understanding, please refer to fig. 1, an embodiment of a power distribution network domain relay protection method provided in the present application includes:
step 101, acquiring fault information of an outdoor line of a power distribution network through an intelligent feeder terminal, and acquiring electrical quantity information of an outgoing line in the station by using an information acquisition module, wherein the fault information comprises a GOOSE message, and the electrical quantity information comprises phase current and zero sequence current.
In the embodiment, a fault accurate positioning mode is adopted to replace a traditional step-by-step matching method to obtain selectivity, so that the fault can be isolated in the minimum range. The substation area type protection device can be used for centralized judgment after obtaining fault information and partial electric quantity information in a protection area, and meanwhile, the selectivity and the quick action performance of protection are achieved. Therefore, it is necessary to simultaneously acquire fault information of the line outside the station and information of the electrical quantity of the outgoing line inside the station. Other fault information and electric quantity information can be selected based on specific power distribution network conditions, and GOOSE messages, phase currents and zero sequence currents are selected in the embodiment, so that fault analysis can be conveniently performed subsequently.
And 102, processing and analyzing the electrical quantity information, and determining a fault section positioning result by combining the fault information and the protection application topology information for comprehensive judgment.
Further, step 102 includes:
receiving and analyzing topology information issued by a master station to obtain the protection application topology information;
if the phase current and the zero sequence current in the electrical quantity information are larger than a preset maximum current, determining that a line fault exists;
and analyzing messages of the GOOSE messages of the fault information corresponding to the line faults, and determining the positioning result of the fault section with the line faults by combining the line faults and the protection application topology information.
In the embodiment, the fault section location is based on the phase current, the zero sequence current and the GOOSE message, so that one of the two fault examples is an interphase short-circuit fault and the other is a ground fault.
When an interphase short-circuit fault occurs in a distribution line, the phase current can be obviously increased, the phase current and the zero sequence current at the moment are acquired and sent to the station-based protection device, in the embodiment, the phase current and the zero sequence current are acquired, the fault information of an intelligent feeder terminal can be acquired at the same time, and the acquisition of the two kinds of information adopts a half-wave algorithm, namely a data window of 10Ms, so that the station-based protection rapid exit within 60Ms after the feeder fault can be realized. For a network in open-loop operation of a radial distribution network or a closed-loop network, when a line has a fault, the phase current and the zero-sequence current of a wire outlet are greater than the maximum load current, and the fault of the line is judged; and if the phase current and the zero sequence current in the outside line are larger than the maximum load current, judging that the node is in fault, and instantaneously triggering the node fault GOOSE to output a fault message. The station domain type rapid protection device determines a fault section by using GOOSE fault messages detected by intelligent feeder terminal STUs at upper and lower-stage circuit breakers and line fault judgment results, and realizes that a trunk line selectively and rapidly cuts off isolation faults.
Referring to fig. 3, QF is a substation outgoing switch, QL is a ring main unit incoming and outgoing switch (where QL32 is a tie switch), STU is an intelligent feeder terminal, and K1 is an interphase short-circuit fault occurrence location. When a fault occurs at the point K1, the intelligent feeder terminals (STU1, STU2, STU3 and STU4) corresponding to the switches QF1, QL11, QL12, QL21 and QL22 respectively send GOOSE fault messages, and meanwhile, the outlet current collected in the station is also larger than a setting value. The station domain type rapid protection device can judge that the fault occurs at the downstream of the switch QL22 according to the network topology, the collected GOOSE fault message and the outlet electric quantity information, therefore, the station domain type rapid protection device immediately sends out a QL22 tripping command and a QL31 tripping command, and the fault isolation of the section is realized.
When a ground fault occurs in the small-resistance grounded urban distribution network and the ground resistance is smaller than 100 omega, the zero-sequence current mutation characteristic is obvious, the zero-sequence overcurrent fault detection function is put into use, the GOOSE fault message is gathered to the station domain type quick protection device, then zero-sequence current fault tripping can be achieved, the ground fault section is isolated, and the fault processing mode is the same as the interphase short circuit fault processing mode. If the grounding resistance is larger than 100 omega, the zero sequence current amplitude is smaller, and then a zero sequence current amplitude comparison method can be adopted as main protection. And setting the zero sequence current alarm threshold of the intelligent feeder line terminal and the outgoing line to be 2A (actually reflecting the fault below 2500 omega). When a fault occurs, alarming that the zero sequence current of each terminal at the upstream of the fault point exceeds a threshold, and uploading the zero sequence current amplitude of each terminal to a site area type rapid protection device. After the station domain type rapid protection device collects the fault information, the zero sequence current amplitude of each terminal is compared, the measuring point with the largest zero sequence current amplitude is selected and judged as the upstream terminal closest to the fault point, and meanwhile, the downstream terminal of the fault point has no fault information. Therefore, the station domain type rapid protection device can issue a fault isolation command to isolate a fault point, and the high-resistance grounding fault processing logic is finished.
103, sending a sectional fault isolation instruction through a station-domain protection device based on the fault information, the preset time range and the fault section positioning result, wherein the fault isolation instruction comprises tripping operation.
Further, step 103 includes:
and when the station domain type protection device continuously receives the fault information and exceeds a preset time range, comprehensively sending a sectional type fault isolation instruction by combining all the fault information and the fault section positioning results, wherein the fault isolation instruction comprises tripping operation.
It will be appreciated that the site-wide protection detects fault information over multiple segments, and thus allows for highly reliable, highly fault-tolerant line protection, i.e. allows for ensuring that the protection device is correctly and quickly exported without complete information or in the event of an error in the information. The preset time range can be set according to actual conditions, the station area type protection device can continuously receive the fault information within the range until the fault information exceeds the preset time range, and then the received fault information and the fault section are analyzed in a unified mode, and therefore comprehensive instruction sending is achieved. Obviously, the tripping action of the intelligent feeder terminal must meet the monitoring of the fault at the same time, and a fault isolation instruction of the station-domain protection device is received; to minimize the risk of errors.
In addition, in the case provided above, in fig. 3, a phase short circuit fault occurs at the point K1, and at this time, if the GOOSE fault message of the STU3 intelligent feeder terminal is not sent or the content of the fault message is wrong due to some reason, the scheme identifies all fault information according to the real-time topology (the timeout time for collecting the GOOSE message is up), and because the adjacent upper and lower stages receive the fault information, it can be determined that the communication of the STU3 is abnormal, and the fault occurs downstream of the switch QL22, so the station domain type fast protection device sends a QL22 trip command and a QL31 trip command. Therefore, the protection mechanism in the embodiment can effectively avoid the error of individual information and improve the fault-tolerant capability of distribution network protection.
Further, step 103 further includes:
and when the communication is abnormal, carrying out the backup protection of the feeder line through a local relay protection device of the intelligent feeder line terminal.
Local protection in the intelligent feeder terminal is used as near backup protection of the feeder, and reliable fault removal is guaranteed when communication is abnormal. The local protection is configured with three-section current protection and three-section zero-sequence current protection, and a level difference processing mode is adopted. The outgoing line local protection device is configured with 0.3s time delay II section current protection and 0.6s time delay III section current protection as backup protection of outgoing line interphase short circuit. Aiming at the high-resistance grounding fault, a self-adaptive zero-sequence overcurrent fault detection function is adopted as backup protection, the core of the backup protection is that proportional current braking quantity is generated according to the magnitude of zero-sequence voltage, a zero-sequence overcurrent protection fixed value is self-adaptively adjusted, and a level difference processing mode is adopted for matching.
In order to facilitate understanding, the application example is further provided for testing the protection function of the distribution network system constructed by the distribution network domain type relay protection method provided by the application. Referring to fig. 4, a station-area type fast protection function test is performed by using a static analog system of an active power distribution network and using a station-area type protection device PZK-800, two feeder terminals PZK-56G, a relay protection test source, and other devices. The configuration of the device is shown in table 1.
TABLE 1 device configuration Table
Table 2 shows the fault isolation times for faults at different locations in the line.
TABLE 2 Fault isolation time summaries
Table 3 shows the protection operation when S16 indicates a tie switch and a phase-to-phase short fault occurs in the line.
TABLE 3 protection action situation in interphase short-circuit fault
In table 4, S16 indicates the protection operation when the line has a single-phase ground fault due to the interconnection switch.
TABLE 4 protective action conditions in single-phase earth fault
As can be seen from table 2, the protection exit time is less than 50ms when a fault occurs at a different location of the line. In fact, the station-domain protection device and the feeder terminal in the static model test are directly connected by a network cable, so that the uploading and issuing time of the GOOSE message information is neglected, and the time delay is required to be considered in field application. In addition, in practical application, the application topology comprises a plurality of feeder lines and a plurality of measuring points, and information delay transmission is ensured. By adopting the rapid transmission technology of the optical fiber intelligent switch of Beijing Enyi Tong company, under the condition of 800M Beijing traffic, the time delay of each hop can be within 3us, and low-time-delay transmission can be ensured. Tables 3 and 4 show that the protection can be selectively tripped when different types of faults occur at different positions of the line, and the feasibility of protection logic and protection principles is illustrated.
Therefore, the regional rapid protection of the power distribution network not only utilizes single electric quantity information of a detection point, but also utilizes centralized optimal decision of electric quantity information of a feeder line in the station and fault information of a feeder line out of the station, and rapidly determines a fault section through multi-point information comparison, thereby solving the problems of influence of a branch line on the outgoing line protection, override trip, long time of downstream cooperation action and the like, improving the power supply reliability of the power distribution network, reducing the power failure range, simultaneously solving the contradiction between the protection speed and the protection selectivity of the power distribution line, and improving the protection performance. The outlet is protected within 60ms after the feeder line fault, and the line fault is selectively removed in a full-line quick-acting mode. Aiming at the problem of high resistance fault detection of the urban distribution network with low resistance grounding, a centralized protection algorithm can form a low-constant-value high-sensitivity protection strategy, and the problem of high resistance grounding fault is effectively solved. The high fault-tolerant performance of the station-domain protection ensures that the protection can still selectively remove the fault under the condition of information loss, and the effective cooperation of the backup protection ensures that the fault can still be reliably removed when the communication is interrupted. Meanwhile, the protection is not influenced by the system operation mode, the setting is simple, and the successful model machine development and test also means that the operability and reliability of the protection technology can be ensured.
According to the power distribution website domain type relay protection method provided by the embodiment of the application, the flexibility and the reliability of a protection system are improved through rapid fault analysis positioning and a domain type protection mechanism; the method comprises the steps that not only electric quantity information of outgoing lines in a station is obtained, but also fault information of lines outside the station is obtained, fault sections are accurately judged based on the information inside and outside the station, and then a station domain type protection device is adopted to send fault isolation instructions with high pertinence according to the fault sections, so that tripping isolation is achieved; trip protection is carried out in a large-scale or step-by-step matching mode, so that the system is quicker and more efficient; not only can the selectivity be ensured, but also the rapidity can be considered; and the integral performance of protection in the station can be improved by adopting the station domain type protection, the cooperation is more flexible, and the fault tolerance rate can be improved. Therefore, the method and the device for protecting the system can solve the technical problem that the existing protection mechanism cannot effectively balance selectivity and quick action performance, so that the protection mechanism of the system is lack of flexibility and reliability.
For easy understanding, please refer to fig. 2, the present application provides an embodiment of a power distribution network domain type relay protection device, including:
the information acquisition module 201 is configured to acquire fault information of an external line of the power distribution network through an intelligent feeder terminal, and acquire electrical quantity information of an internal outgoing line by using an information acquisition module, where the fault information includes a GOOSE message and the electrical quantity information includes phase current and zero sequence current;
the fault analysis module 202 is configured to process and analyze the electrical quantity information, and determine a fault section positioning result by combining the fault information and the protection application topology information to perform comprehensive judgment;
and the station area protection module 203 is configured to send a sectional type fault isolation instruction through a station area type protection device based on the fault information, a preset time range and the fault section positioning result, where the fault isolation instruction includes a trip operation.
Further, the fault analysis module 202 is specifically configured to:
receiving and analyzing topology information issued by a master station to obtain the protection application topology information;
if the phase current and the zero sequence current in the electrical quantity information are larger than a preset maximum current, determining that a line fault exists;
and analyzing messages of the GOOSE messages of the fault information corresponding to the line faults, and determining the positioning result of the fault section with the line faults by combining the line faults and the protection application topology information.
Further, the station domain protection module 203 is specifically configured to:
and when the station domain type protection device continuously receives the fault information and exceeds a preset time range, comprehensively sending a sectional type fault isolation instruction by combining all the fault information and the fault section positioning results, wherein the fault isolation instruction comprises tripping operation.
Further, still include:
and the backup protection module 204 is used for performing feeder backup protection through the local relay protection device of the intelligent feeder terminal when communication is abnormal.
The application also provides a power distribution website domain type relay protection device, which comprises a processor and a memory;
the memory is used for storing the program codes and transmitting the program codes to the processor;
the processor is used for executing the power distribution network domain relay protection method in the above method embodiment according to instructions in the program code.
The application also provides a computer readable storage medium for storing program codes, wherein the program codes are used for executing the power distribution network domain relay protection method in the above method embodiment.
In the several embodiments provided in the present application, it should be understood that the disclosed apparatus and method may be implemented in other ways. For example, the above-described apparatus embodiments are merely illustrative, and for example, the division of the units is only one logical division, and other divisions may be realized in practice, for example, a plurality of units or components may be combined or integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces, devices or units, and may be in an electrical, mechanical or other form.
The units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment.
In addition, functional units in the embodiments of the present application may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit. The integrated unit can be realized in a form of hardware, and can also be realized in a form of a software functional unit.
The integrated unit, if implemented in the form of a software functional unit and sold or used as a stand-alone product, may be stored in a computer readable storage medium. Based on such understanding, the technical solution of the present application may be substantially implemented or contributed to by the prior art, or all or part of the technical solution may be embodied in a software product, which is stored in a storage medium and includes instructions for executing all or part of the steps of the method described in the embodiments of the present application through a computer device (which may be a personal computer, a server, or a network device). And the aforementioned storage medium includes: a U disk, a removable hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk or an optical disk, and other various media capable of storing program codes.
The above embodiments are only used for illustrating the technical solutions of the present application, and not for limiting the same; although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions in the embodiments of the present application.
Claims (10)
1. A power distribution website domain type relay protection method is characterized by comprising the following steps:
the method comprises the steps that fault information of an out-of-station line of a power distribution network is obtained through an intelligent feeder terminal, and meanwhile, electric quantity information of an in-station outgoing line is obtained through an information acquisition module, wherein the fault information comprises a GOOSE message, and the electric quantity information comprises phase current and zero sequence current;
processing and analyzing the electrical quantity information, and comprehensively judging by combining the fault information and the protection application topology information to determine a fault section positioning result;
and sending a sectional type fault isolation instruction through a station domain type protection device based on the fault information, a preset time range and the fault section positioning result, wherein the fault isolation instruction comprises tripping operation.
2. The distribution network site domain relay protection method of claim 1, wherein the processing and analyzing of the electrical quantity information and the determination of the fault section positioning result by combining the fault information and the protection application topology information, comprises:
receiving and analyzing topology information issued by a master station to obtain the protection application topology information;
if the phase current and the zero sequence current in the electrical quantity information are larger than a preset maximum current, determining that a line fault exists;
and analyzing messages of the GOOSE messages of the fault information corresponding to the line faults, and determining the positioning result of the fault section with the line faults by combining the line faults and the protection application topology information.
3. The distribution network regional relay protection method of claim 1, wherein a regional fault isolation instruction is sent by a regional protection device based on the fault information, a preset time range and the fault region positioning result, wherein the fault isolation instruction comprises a trip operation, and comprises:
and when the station domain type protection device continuously receives the fault information and exceeds a preset time range, comprehensively sending a sectional type fault isolation instruction by combining all the fault information and the fault section positioning results, wherein the fault isolation instruction comprises tripping operation.
4. The distribution network site domain relay protection method according to claim 1, wherein a regional fault isolation instruction is sent by a regional protection device based on the fault information, a preset time range and the fault region positioning result, the fault isolation instruction includes a trip operation, and further comprising:
and when the communication is abnormal, carrying out the backup protection of the feeder line through the local relay protection device of the intelligent feeder line terminal.
5. A power distribution network station domain type relay protection device is characterized by comprising:
the system comprises an information acquisition module, a fault detection module and a fault detection module, wherein the information acquisition module is used for acquiring fault information of an out-of-station line of the power distribution network through an intelligent feeder terminal and acquiring electric quantity information of an in-station outgoing line by using an information acquisition module, the fault information comprises a GOOSE message, and the electric quantity information comprises phase current and zero sequence current;
the fault analysis module is used for processing and analyzing the electrical quantity information, comprehensively judging by combining the fault information and the protection application topology information, and determining a fault section positioning result;
and the station domain protection module is used for sending a sectional type fault isolation instruction through a station domain type protection device based on the fault information, the preset time range and the fault section positioning result, wherein the fault isolation instruction comprises tripping operation.
6. The distribution network site domain relay protection device of claim 5, wherein the fault analysis module is specifically configured to:
receiving and analyzing topology information issued by a master station to obtain the protection application topology information;
if the phase current and the zero sequence current in the electrical quantity information are larger than a preset maximum current, determining that a line fault exists;
and analyzing messages of the GOOSE messages of the fault information corresponding to the line faults, and determining the positioning result of the fault section with the line faults by combining the line faults and the protection application topology information.
7. The distribution network domain relay protection device of claim 5, wherein the domain protection module is specifically configured to:
and when the station domain type protection device continuously receives the fault information and exceeds a preset time range, comprehensively sending a sectional type fault isolation instruction by combining all the fault information and the fault section positioning results, wherein the fault isolation instruction comprises tripping operation.
8. The electrical distribution network site territory relay protection device of claim 5, further comprising:
and the backup protection module is used for carrying out the backup protection of the feeder line through the local relay protection device of the intelligent feeder line terminal when the communication is abnormal.
9. The power distribution website domain type relay protection equipment is characterized by comprising a processor and a memory;
the memory is used for storing program codes and transmitting the program codes to the processor;
the processor is used for executing the power distribution network domain relay protection method of any one of claims 1 to 4 according to instructions in the program code.
10. A computer-readable storage medium for storing program code for executing the distribution network domain relay protection method according to any one of claims 1 to 4.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111495995.XA CN114172130A (en) | 2021-12-08 | 2021-12-08 | Domain relay protection method for power distribution network and related device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111495995.XA CN114172130A (en) | 2021-12-08 | 2021-12-08 | Domain relay protection method for power distribution network and related device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN114172130A true CN114172130A (en) | 2022-03-11 |
Family
ID=80484627
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202111495995.XA Pending CN114172130A (en) | 2021-12-08 | 2021-12-08 | Domain relay protection method for power distribution network and related device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN114172130A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115825655A (en) * | 2023-02-20 | 2023-03-21 | 国网山东省电力公司乳山市供电公司 | System and method for rapidly monitoring and positioning single-phase earth fault of distribution network |
| CN116466154A (en) * | 2023-03-23 | 2023-07-21 | 国能大渡河流域水电开发有限公司 | Fault diagnosis method and device, storage medium and electronic equipment |
| CN117074867A (en) * | 2023-10-12 | 2023-11-17 | 广州市扬新技术研究有限责任公司 | Urban rail transit power supply system fault positioning method based on inter-station GOOSE information |
| CN118523269A (en) * | 2024-07-24 | 2024-08-20 | 国网浙江省电力有限公司丽水供电公司 | Self-healing method and system for double-ring network type power distribution network under communication abnormal scene |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102832600A (en) * | 2012-07-31 | 2012-12-19 | 许继集团有限公司 | Regional failure protection method based on power grid topological structure |
| US20130262922A1 (en) * | 2012-03-27 | 2013-10-03 | State Grid Corporation Of China | Centralized and networked protection system and method of a regional distribution network |
| CN105093061A (en) * | 2015-06-11 | 2015-11-25 | 江苏安方电力科技有限公司 | Power distribution network line fault on-line monitoring and alarming system |
| CN105891673A (en) * | 2016-04-01 | 2016-08-24 | 济南大学 | PMU-based distribution network fault locating system and method thereof |
| CN106058831A (en) * | 2016-08-05 | 2016-10-26 | 江苏方天电力技术有限公司 | Intelligent distributed rapid protection and fault isolation method of self-adaptive power distribution network |
| CN111431150A (en) * | 2020-05-09 | 2020-07-17 | 杨益 | Power distribution fault processing method |
| WO2020243951A1 (en) * | 2019-06-06 | 2020-12-10 | 北京四方继保自动化股份有限公司 | Millisecond rapid reconstruction method and system for power supply network after power network failure |
| CN113241855A (en) * | 2021-06-18 | 2021-08-10 | 广东电网有限责任公司 | Domain-based rapid protection system and method for power distribution network |
-
2021
- 2021-12-08 CN CN202111495995.XA patent/CN114172130A/en active Pending
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20130262922A1 (en) * | 2012-03-27 | 2013-10-03 | State Grid Corporation Of China | Centralized and networked protection system and method of a regional distribution network |
| CN102832600A (en) * | 2012-07-31 | 2012-12-19 | 许继集团有限公司 | Regional failure protection method based on power grid topological structure |
| CN105093061A (en) * | 2015-06-11 | 2015-11-25 | 江苏安方电力科技有限公司 | Power distribution network line fault on-line monitoring and alarming system |
| CN105891673A (en) * | 2016-04-01 | 2016-08-24 | 济南大学 | PMU-based distribution network fault locating system and method thereof |
| CN106058831A (en) * | 2016-08-05 | 2016-10-26 | 江苏方天电力技术有限公司 | Intelligent distributed rapid protection and fault isolation method of self-adaptive power distribution network |
| WO2020243951A1 (en) * | 2019-06-06 | 2020-12-10 | 北京四方继保自动化股份有限公司 | Millisecond rapid reconstruction method and system for power supply network after power network failure |
| CN111431150A (en) * | 2020-05-09 | 2020-07-17 | 杨益 | Power distribution fault processing method |
| CN113241855A (en) * | 2021-06-18 | 2021-08-10 | 广东电网有限责任公司 | Domain-based rapid protection system and method for power distribution network |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115825655A (en) * | 2023-02-20 | 2023-03-21 | 国网山东省电力公司乳山市供电公司 | System and method for rapidly monitoring and positioning single-phase earth fault of distribution network |
| CN115825655B (en) * | 2023-02-20 | 2023-06-16 | 国网山东省电力公司乳山市供电公司 | Distribution network single-phase grounding fault rapid monitoring and positioning system and method |
| CN116466154A (en) * | 2023-03-23 | 2023-07-21 | 国能大渡河流域水电开发有限公司 | Fault diagnosis method and device, storage medium and electronic equipment |
| CN116466154B (en) * | 2023-03-23 | 2023-12-29 | 国能大渡河流域水电开发有限公司 | Fault diagnosis method and device, storage medium and electronic equipment |
| CN117074867A (en) * | 2023-10-12 | 2023-11-17 | 广州市扬新技术研究有限责任公司 | Urban rail transit power supply system fault positioning method based on inter-station GOOSE information |
| CN118523269A (en) * | 2024-07-24 | 2024-08-20 | 国网浙江省电力有限公司丽水供电公司 | Self-healing method and system for double-ring network type power distribution network under communication abnormal scene |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN114172130A (en) | Domain relay protection method for power distribution network and related device | |
| US20200412167A1 (en) | Method and system for fast reconfiguration of power supply network in tens of milliseconds after power grid failure | |
| CN106370975B (en) | A kind of pinpoint method of electrical power distribution automatization system single-phase earthing section | |
| US20110144931A1 (en) | Method and apparatus for high-speed fault detection in distribution systems | |
| CN111337790A (en) | Distribution network real mirror test platform and detection method for primary and secondary fusion power distribution equipment | |
| CN108287295B (en) | Power line ground fault position finding method and system | |
| CN107561408B (en) | Method for improving accuracy rate of small current ground fault line selection | |
| US11489365B2 (en) | Non-three-phase fault isolation and restoration systems | |
| CN110768206B (en) | Single-phase earth fault protection method for small-resistance earth system | |
| CN109412124B (en) | Distribution line interphase short circuit protection configuration and setting method | |
| CN106684822A (en) | Transformer dead-zone fault protection method and breaker failure protection method | |
| CN113884816A (en) | Single-phase earth fault section positioning method, device, equipment and storage medium | |
| CN116316486B (en) | Power distribution network line protection method, system and equipment | |
| Lifan et al. | The Experiences of Decentralized Self-Healing Grid | |
| CN110048383B (en) | Distribution network distributed comprehensive protection system | |
| Tutvedt et al. | Smart fault handling in medium voltage distribution grids | |
| JP2004053554A (en) | Distribution line disconnection detection system | |
| Jankovski et al. | Novel busbar protection scheme for impedance-earthed distribution networks | |
| CN114137361B (en) | Single-phase earth fault line selection method for power distribution network | |
| CN112491016B (en) | Selective small-current self-adaptive protection method | |
| CN212111743U (en) | Single-phase earth fault detection system of line selection device for neutral point ungrounded system | |
| CN103915826A (en) | Automatic power distribution network fault judging and control method of full-breaker ring main unit power supply | |
| Mallikarjuna et al. | Real-time wide-area disturbance monitoring and protection methodology for EHV transmission lines | |
| CN113937741A (en) | Master-slave intelligent power distribution automation system | |
| CN113541109A (en) | Feeder fault processing system and method based on power wireless private network |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |