CN111323677B - Power distribution network fault positioning method, device and system - Google Patents
Power distribution network fault positioning method, device and system Download PDFInfo
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- CN111323677B CN111323677B CN202010146629.2A CN202010146629A CN111323677B CN 111323677 B CN111323677 B CN 111323677B CN 202010146629 A CN202010146629 A CN 202010146629A CN 111323677 B CN111323677 B CN 111323677B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/08—Locating faults in cables, transmission lines, or networks
- G01R31/081—Locating faults in cables, transmission lines, or networks according to type of conductors
- G01R31/086—Locating faults in cables, transmission lines, or networks according to type of conductors in power transmission or distribution networks, i.e. with interconnected conductors
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
- Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
- Y04S10/00—Systems supporting electrical power generation, transmission or distribution
- Y04S10/50—Systems or methods supporting the power network operation or management, involving a certain degree of interaction with the load-side end user applications
- Y04S10/52—Outage or fault management, e.g. fault detection or location
Abstract
The disclosure relates to a power distribution network fault positioning method, device and system. The method comprises the following steps: circuit information is exchanged between the master intelligent power distribution terminal and the plurality of slave intelligent power distribution terminals; any slave intelligent power distribution terminal carries out circuit differential monitoring based on circuit information; when any slave intelligent power distribution terminal monitors that a circuit differential exists between the slave intelligent power distribution terminal and other slave intelligent power distribution terminals, fault information is sent to the master intelligent power distribution terminal; and the main intelligent power distribution terminal carries out fault positioning according to the fault information and the network topology structure of the power distribution network. According to the power distribution network fault positioning method, device and system, feeder line faults in the power distribution network can be accurately and quickly positioned and isolated; the problems of complex setting matching and poor selectivity of the traditional power distribution network relay protection can be solved, and the large-area power failure risk caused by large-scale transfer of fault tide can be reduced.
Description
Technical Field
The disclosure relates to the technical field of distribution network automation, in particular to a distribution network fault positioning method, device and system.
Background
Due to the development of energy science and technology, a large number of distributed power supplies with intermittent characteristics are connected into a power distribution network at present, and the operation modes of the distributed power supplies are flexible and changeable, so that relay protection setting matching of the traditional power distribution network is complex and poor in selectivity, fault trend is easily transferred in a large range when a power grid fault occurs, further, the actions of backup protection interlocking misoperation and the like can be caused easily, and large power failure can never be caused.
If the traditional current protection or distance protection is adopted for the short-distance medium-low voltage short circuit in the power distribution network, the short circuit is difficult to match in the setting value and the action time, and the circuit risk and fault location in the power distribution network cannot be effectively found. The multi-terminal differential protection method has the advantages that the communication technology and the multi-terminal differential protection concept are integrated, the development principle is simple and reliable, the action sensitivity is high, the setting and matching are easy, the problems existing in the traditional protection can be effectively solved, the basic work of ensuring low-carbon, intelligent, safe and reliable operation of the power distribution network in the future is realized, and the method has important theoretical and practical significance for realizing the development target of the intelligent power distribution network.
The above information disclosed in this background section is only for enhancement of understanding of the background of the disclosure and therefore it may contain information that does not form the prior art that is already known to a person of ordinary skill in the art.
Disclosure of Invention
In view of the above, the present disclosure provides a method, an apparatus, and a system for power distribution network fault location, which can implement accurate and fast location and fault isolation of feeder faults in a power distribution network, and can isolate a fault power outage area to the minimum; the problems of complex relay protection setting matching and poor selectivity of the traditional power distribution network can be solved, and the large power outage risk caused by back-up protection linkage misoperation caused by large-range transfer of fault tide can be reduced.
Additional features and advantages of the disclosure will be set forth in the detailed description which follows, or in part will be obvious from the description, or may be learned by practice of the disclosure.
According to one aspect of the disclosure, a power distribution network fault positioning method is provided, and the method includes: circuit information is exchanged between the master intelligent power distribution terminal and the plurality of slave intelligent power distribution terminals; any slave intelligent power distribution terminal carries out circuit differential monitoring based on circuit information; when any slave intelligent power distribution terminal monitors that a circuit differential exists between the slave intelligent power distribution terminal and other slave intelligent power distribution terminals, fault information is sent to the master intelligent power distribution terminal; and the main intelligent power distribution terminal carries out fault positioning according to the fault information and the network topology structure of the power distribution network.
In an exemplary embodiment of the present disclosure, further comprising: taking an intelligent power distribution terminal on a feeder outlet circuit breaker as a main intelligent power distribution terminal; the intelligent power distribution terminals at the interconnection switches are used as slave intelligent power distribution terminals; and connecting the master intelligent power distribution terminal and the plurality of slave intelligent power distribution terminals through a network to generate a network topology structure of the power distribution network.
In an exemplary embodiment of the present disclosure, further comprising: the main intelligent power distribution terminal determines at least two target switches based on the fault area and the network topology; and sending a tripping instruction to the at least two target switches to carry out fault isolation on the power distribution network.
In an exemplary embodiment of the present disclosure, the master intelligent power distribution terminal determining at least two target switches based on the fault region and the network topology, comprising: the main intelligent power distribution terminal determines a differential mode based on the fault area and the network topological structure, wherein the differential mode comprises a current differential mode and a circuit differential mode; determining trip control logic based on the current differential mode or the circuit differential mode; and determining the at least two target switches based on the trip control logic.
In an exemplary embodiment of the present disclosure, after circuit information is exchanged between the master intelligent power distribution terminal and the plurality of slave intelligent power distribution terminals, the method further includes: and the master intelligent power distribution terminal and the plurality of slave intelligent power distribution terminals are synchronously adjusted based on clock signals of a ping-pong principle.
In an exemplary embodiment of the present disclosure, circuit information is exchanged between a master intelligent power distribution terminal and a plurality of slave intelligent power distribution terminals, including: the method comprises the steps that a master intelligent power distribution terminal obtains a plurality of slave circuit information from a plurality of slave intelligent power distribution terminals; the master intelligent power distribution terminal sends master circuit information and the plurality of slave circuit information to the plurality of slave intelligent power distribution terminals.
In an exemplary embodiment of the present disclosure, any slave intelligent power distribution terminal performs circuit differential monitoring based on circuit information, including: any slave intelligent power distribution terminal is in circuit change with other adjacent slave intelligent power distribution terminals based on the circuit information; when the circuit change condition exceeds a threshold, a circuit differential is determined to be present.
In an exemplary embodiment of the present disclosure, the performing fault location by the master intelligent power distribution terminal according to the fault information and a network topology of a power distribution network includes: the master intelligent power distribution terminal receives fault information from the slave intelligent power distribution terminal; and determining a fault area according to the fault information and the position of the slave intelligent power distribution terminal in the network topology structure.
According to an aspect of the present disclosure, a power distribution network fault location device is provided, the device including: the information module is used for exchanging circuit information between the master intelligent power distribution terminal and the plurality of slave intelligent power distribution terminals; the monitoring module is used for carrying out circuit differential monitoring on any slave intelligent power distribution terminal based on circuit information; the fault module is used for sending fault information to the main intelligent power distribution terminal when any slave intelligent power distribution terminal monitors that circuit differential motion exists between the slave intelligent power distribution terminal and other slave intelligent power distribution terminals; and the positioning module is used for positioning the fault by the main intelligent power distribution terminal according to the fault information and the network topology structure of the power distribution network.
According to an aspect of the present disclosure, a power distribution network fault location system is provided, the system comprising: the master intelligent power distribution terminal is used for exchanging circuit information among the plurality of slave intelligent power distribution terminals; receiving fault information, and positioning faults according to the fault information and a network topology structure of the power distribution network; the slave intelligent power distribution terminals are used for carrying out circuit differential monitoring based on circuit information; and when the circuit differential motion exists between the monitored intelligent power distribution terminal and other slave intelligent power distribution terminals, fault information is sent to the master intelligent power distribution terminal.
According to the power distribution network fault positioning method, device and system, circuit information is exchanged between a master intelligent power distribution terminal and a plurality of slave intelligent power distribution terminals; any slave intelligent power distribution terminal carries out circuit differential monitoring based on circuit information; when any slave intelligent power distribution terminal monitors that a circuit differential exists between the slave intelligent power distribution terminal and other slave intelligent power distribution terminals, fault information is sent to the master intelligent power distribution terminal; the main intelligent power distribution terminal carries out fault positioning according to the fault information and the network topology structure of the power distribution network, so that feeder line faults in the power distribution network can be accurately and quickly positioned and isolated, and a fault power failure area can be isolated to the minimum; the problems of complex setting matching and poor selectivity of traditional power distribution network relay protection can be solved, and the large power failure risk caused by backup protection interlocking misoperation due to large-range fault trend transfer can be reduced.
It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the disclosure.
Drawings
The above and other objects, features and advantages of the present disclosure will become more apparent by describing in detail exemplary embodiments thereof with reference to the attached drawings. The drawings described below are merely some embodiments of the present disclosure, and other drawings may be derived from those drawings by those of ordinary skill in the art without inventive effort.
Fig. 1 is a schematic system structure diagram illustrating a power distribution network fault location method according to an exemplary embodiment.
Fig. 2 is a network topology diagram illustrating a method for locating a fault in a power distribution network according to an exemplary embodiment.
Fig. 3 is a flow chart illustrating a method for power distribution network fault location in accordance with an exemplary embodiment.
Fig. 4 is a flow chart illustrating a method of power distribution network fault location according to another exemplary embodiment.
Fig. 5 is a synchronization diagram illustrating a method for power distribution network fault location according to another exemplary embodiment.
Fig. 6 is a block diagram illustrating a power distribution network fault locating device in accordance with an exemplary embodiment.
Fig. 7 is a block diagram illustrating a power distribution network fault locating device in accordance with another exemplary embodiment.
FIG. 8 is a block diagram illustrating an electronic device in accordance with an example embodiment.
FIG. 9 is a block diagram illustrating a computer-readable medium in accordance with an example embodiment.
Detailed Description
Example embodiments will now be described more fully with reference to the accompanying drawings. Example embodiments may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the concept of example embodiments to those skilled in the art. The same reference numerals denote the same or similar parts in the drawings, and thus, a repetitive description thereof will be omitted.
Furthermore, the described features, structures, or characteristics may be combined in any suitable manner in one or more embodiments. In the following description, numerous specific details are provided to give a thorough understanding of embodiments of the disclosure. One skilled in the relevant art will recognize, however, that the subject matter of the present disclosure can be practiced without one or more of the specific details, or with other methods, components, devices, steps, and so forth. In other instances, well-known methods, devices, implementations, or operations have not been shown or described in detail to avoid obscuring aspects of the disclosure.
The block diagrams shown in the figures are functional entities only and do not necessarily correspond to physically separate entities. I.e. these functional entities may be implemented in the form of software, or in one or more hardware modules or integrated circuits, or in different networks and/or processor means and/or microcontroller means.
The flow charts shown in the drawings are merely illustrative and do not necessarily include all of the contents and operations/steps, nor do they necessarily have to be performed in the order described. For example, some operations/steps may be decomposed, and some operations/steps may be combined or partially combined, so that the actual execution sequence may be changed according to the actual situation.
It will be understood that, although the terms first, second, third, etc. may be used herein to describe various components, these components should not be limited by these terms. These terms are used to distinguish one element from another. Thus, a first component discussed below may be termed a second component without departing from the teachings of the disclosed concept. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.
It is to be understood by those skilled in the art that the drawings are merely schematic representations of exemplary embodiments, and that the blocks or processes shown in the drawings are not necessarily required to practice the present disclosure and are, therefore, not intended to limit the scope of the present disclosure.
Fig. 1 is a system block diagram illustrating a method, apparatus, and system for power distribution network fault location according to an exemplary embodiment.
As shown in fig. 1, system architecture 10 may include slave intelligent power distribution terminals 101, 102, 103, a network 104, and a master intelligent power distribution terminal 105. The network 104 is used to provide the medium of communication links between the slave intelligent power distribution terminals 101, 102, 103 and the master intelligent power distribution terminal 105. Network 104 may include various connection types, such as wireless communication links or fiber optic cables, among others. Information interaction can be performed between the slave intelligent power distribution terminals 101, 102 and 103 and the master intelligent power distribution terminal 105 through the network 104.
Circuit information is exchanged between the master intelligent power distribution terminal 105 and the slave intelligent power distribution terminals 101, 102 and 103; any slave intelligent power distribution terminal 102 (or 101 or 103) performs circuit differential monitoring based on the circuit information; when any slave intelligent power distribution terminal 102 (or 101 or 103) monitors that a circuit differential exists between the slave intelligent power distribution terminal and other slave intelligent power distribution terminals, fault information is sent to the master intelligent power distribution terminal 105; and the main intelligent power distribution terminal 105 performs fault location according to the fault information and the network topology structure of the power distribution network.
The master intelligent power distribution terminal 105 determines at least two target switches based on the fault region and the network topology; and sending a tripping instruction to the at least two target switches to carry out fault isolation on the power distribution network.
It should be noted that the power distribution network fault location method provided by the embodiment of the present disclosure may be executed by the master intelligent power distribution terminal 105 and the slave intelligent power distribution terminals 101, 102, 103, and accordingly, a power distribution network fault location device may be disposed in the master intelligent power distribution terminal 105 and the slave intelligent power distribution terminals 101, 102, 103.
The distribution network feeder line fault positioning method disclosed by the invention adopts current differential motion and direction differential motion to realize accurate and rapid positioning and fault isolation of the distribution network feeder line fault.
Fig. 2 is a network topology diagram illustrating a method for locating a fault in a power distribution network according to an exemplary embodiment. In one embodiment, further comprising: taking an intelligent power distribution terminal on a feeder outlet circuit breaker as a main intelligent power distribution terminal; the intelligent power distribution terminals at the interconnection switches are used as slave intelligent power distribution terminals; and connecting the master intelligent power distribution terminal and the plurality of slave intelligent power distribution terminals through a network to generate a network topology structure of the power distribution network. As shown in fig. 2, in the distribution network topology system diagram, the substation outgoing line switch is CB, the feeder section switches are S1, S2, S3, S4 and S5, the intelligent power distribution terminals are M0, M1, M2, M3, M4 and M5, and each intelligent terminal transmits electrical quantity information through an EPON network.
More specifically, a master intelligent distribution terminal M0 may be installed at the feeder outlet breaker, and slave intelligent distribution terminals M1, M2, M3, M4, M5, etc., may be installed at the tie switches. And the master intelligent power distribution terminal and the slave intelligent power distribution terminal are networked through EPON optical fibers. The method comprises the steps that a network topological graph association list is stored on a main intelligent power distribution terminal, the list comprises all slave intelligent power distribution terminal lists which form current differential at two ends with the main intelligent power distribution terminal, the list comprises a multi-branch structure direction differential slave list and a node adjacent node list.
The power distribution network fault positioning method is simple and reliable in principle, high in action sensitivity and easy in setting and matching, can realize rapid positioning and isolation of distribution network faults, meets the development target of the intelligent power distribution network, can effectively solve the problems existing in the traditional distribution network protection, is a basic work for ensuring low-carbon and intelligent safe and reliable operation of the future power distribution network, and has important theoretical and practical significance for realizing the development target of the intelligent power distribution network.
Fig. 3 is a flow chart illustrating a method for power distribution network fault location in accordance with an exemplary embodiment. The power distribution network fault location method 30 includes at least steps S302 to S308.
As shown in fig. 3, in S302, circuit information is exchanged between a master intelligent power distribution terminal and a plurality of slave intelligent power distribution terminals. The method comprises the following steps: the method comprises the steps that a master intelligent power distribution terminal obtains a plurality of slave circuit information from a plurality of slave intelligent power distribution terminals; the master intelligent power distribution terminal sends master circuit information and the plurality of slave circuit information to the plurality of slave intelligent power distribution terminals.
Each intelligent power distribution terminal can send voltage vectors, current vectors, switch states, directions and trip information collected at the switch position to the main intelligent power distribution terminal M0; the master intelligent distribution terminal M0 may broadcast to each slave intelligent distribution terminal the voltage samples, current samples, switch status, direction, trip information collected at M0, and each switch status, direction, trip information collected by M0 and sent from all the slave intelligent distribution terminals.
In S304, any slave intelligent power distribution terminal performs circuit differential monitoring based on the circuit information. Can include the following steps: any slave intelligent power distribution terminal is in circuit change with other adjacent slave intelligent power distribution terminals based on the circuit information; when the circuit change condition exceeds a threshold, a circuit differential is determined to be present.
By way of example in fig. 2, M0-M1, M0-M2, M0-M3 may form a current differential, which is a two-terminal differential, and when there are branches on the switch at multiple terminals, the monitoring may be performed in a direction differential manner.
In S306, when any slave intelligent power distribution terminal monitors that a circuit differential exists between the slave intelligent power distribution terminal and another slave intelligent power distribution terminal, fault information is sent to the master intelligent power distribution terminal.
In one embodiment, a directional differential may be formed, for example, by adjacent switches: M0-M1 form a pair, and the M0 and M1 carry out direction differential logic judgment; M1-M2 form a pair, direction differential logic judgment is carried out by M1 and M2, and information between M1 and M2 is transferred and interacted through M0; m2 and M3 form a pair, direction differential logic judgment is carried out by M2 and M3, and information between M2 and M3 is transferred and interacted through M0; m3, M4 and M5 form a group and carry out direction differential logic judgment;
in one embodiment, the current differential trip control logic may, for example: if a short-circuit fault occurs between S2 and S3, M0-M3 is in current differential action, M0-M1 is in current differential non-action, M0-M2 is not in action, and M0 trips to enable M2 and M3 to trip S2 and S3. If the switch S2 fails or the fault current exceeds the cut-off capability, the M2 sends a signal that the S2 does not trip to the M0, and the M0 sends a signal to the M1 to jump to the S1 according to the judgment of the topological structure. If the switch S3 fails or the fault current exceeds the cut-off capability, the M3 sends a signal that the S3 does not trip, and the M0 sends the signal to the M4 and the M5 to jump to the S4 and the S5 according to the judgment of the topological structure.
In one embodiment, the directional differential trip control logic may, for example: when a short-circuit fault occurs between S2 and S3, M2 acts in the positive direction, M3 acts in the negative direction or no current flows, the fault is judged to be between S2 and S3, and M2 and M3 skip switches S2 and S3; if the switch S2 fails or the fault current exceeds the cut-off capability, the M2 sends a signal that the S2 does not trip to the M0, and the M0 sends a signal to the M1 to jump to the S1 according to the judgment of the topological structure. If the switch S3 fails or the fault current exceeds the cut-off capability, the M3 sends a signal that the S3 does not trip, the M0 makes a topology judgment, and then sends the signal to the M4 and the M5 to jump to the S4 and the S5.
In one embodiment, for example, a branch structure exists between two adjacent switches, and the direction differential control logic is adopted without performing current differential: when a short-circuit fault occurs among S3, S4, and S5, the directional differential operation of M3, M4, and M5 trips S3, S4, and S5, respectively.
In S308, the master intelligent power distribution terminal performs fault location according to the fault information and the network topology of the power distribution network. Can include the following steps: the master intelligent power distribution terminal receives fault information from the slave intelligent power distribution terminal; and determining a fault area according to the fault information and the position of the slave intelligent power distribution terminal in the network topology structure. And after judging that the differential motion exists, each slave intelligent power distribution terminal collects the fault information to the master intelligent power distribution terminal M0, and the M0 judges the minimum fault area according to the topological structure.
According to the power distribution network fault positioning method, circuit information is exchanged between a master intelligent power distribution terminal and a plurality of slave intelligent power distribution terminals; any slave intelligent power distribution terminal carries out circuit differential monitoring based on circuit information; when any slave intelligent power distribution terminal monitors that a circuit differential exists between the slave intelligent power distribution terminal and other slave intelligent power distribution terminals, fault information is sent to the master intelligent power distribution terminal; the main intelligent power distribution terminal carries out fault positioning according to the fault information and the network topology structure of the power distribution network, so that feeder line faults in the power distribution network can be accurately and quickly positioned and isolated, and a fault power failure area can be isolated to the minimum; the problems of complex setting matching and poor selectivity of traditional power distribution network relay protection can be solved, and the large power failure risk caused by backup protection interlocking misoperation due to large-range fault trend transfer can be reduced.
It should be clearly understood that this disclosure describes how to make and use particular examples, but the principles of this disclosure are not limited to any details of these examples. Rather, these principles can be applied to many other embodiments based on the teachings of the present disclosure.
Fig. 4 is a flow chart illustrating a method of power distribution network fault location according to another exemplary embodiment. The flow shown in fig. 4 is a supplementary description of the flow shown in fig. 2.
As shown in fig. 4, in S402, the main intelligent power distribution terminal determines a differential mode based on the fault region and the network topology, where the differential mode includes a current differential mode and a circuit differential mode.
In S404, trip control logic is determined based on the current differential mode or the circuit differential mode.
In S406, the at least two target switches are determined based on the trip control logic.
In S408, a trip instruction is sent to the at least two target switches for fault isolation of the power distribution network.
As shown in fig. 2, M0-M1, M0-M2 and M0-M3 form a current differential, differential logic is not made on the side of the master intelligent power distribution terminal M0 in consideration of CPU load, the differential logic is processed by each slave intelligent power distribution terminal M1, M2 and M3, after the differential is judged by each slave intelligent power distribution terminal, information is gathered to the master intelligent power distribution terminal M0, and M0 judges a minimum fault area according to a topological structure and triggers devices on two sides of the corresponding fault area to perform fault isolation.
Furthermore, when the command is tripped, the switch fails, the failure information is sent to the main intelligent power distribution terminal M0 from the intelligent power distribution terminal where the switch is located, and the adjacent switch of the failure switch is tripped after the M0 receives the signal, so that failure protection is realized, and fault isolation is limited to the minimum range.
In one embodiment, after circuit information is exchanged between the master intelligent power distribution terminal and the plurality of slave intelligent power distribution terminals, the method further comprises the following steps: and the master intelligent power distribution terminal and the plurality of slave intelligent power distribution terminals are synchronously adjusted based on clock signals of a ping-pong principle.
As shown in fig. 5, a sampling synchronization adjustment scheme for clock signal synchronization of the ping-pong principle. Wherein: synM is a synchronous clock signal of the M station, and the interval is 1 s; synN is a synchronous clock signal of the N stations, and the interval is 1 s;
synchronizing clock signal time difference between the M station and the N station; TMA and TNA refer to the time when the differential protection device of the station receives the synchronous signal frame of the differential protection device of the opposite side relative to the last timeTime of the synchronous clock; TMB and TNB are the time of the opposite side differential protection device 'synchronization confirmation frame' received by the local station differential protection device relative to the last synchronous clock.
Furthermore, M0 is used as a main intelligent power distribution terminal to synchronously adjust M1, M2 and M3. The synchronous adjustment adopts a sampling synchronous adjustment scheme of clock signal synchronization based on a ping-pong principle; taking the differential protection from the intelligent power distribution terminal M as an example, when a device receives a synchronization signal synM of the local station, a "synchronization signal frame" is added to a data frame transmitted to the intelligent power distribution terminal N; and simultaneously, when a synchronizing signal frame transmitted from the N side is received, recording the time difference TMA of the time relative to the synchronizing clock of the side, and simultaneously sending back a synchronizing confirmation frame of one frame of the N side. The "synchronization confirmation frame" contains TMA. The transmitting and receiving processes of the devices on the N side are the same. When the M-side differential protection receives the "synchronization confirmation frame" transmitted from the N station, the time difference TNB of the current time with respect to the own-side synchronization clock is recorded. After one round trip, the M-station protection devices know that the time difference between the synchronous clocks of the local side protection device and the opposite side protection device is Δ t = TNB/2-TMA. Similarly, the time difference between the synchronous clocks of the protection device at the side detected by the N station and the protection device at the opposite side is t = TMB/2-TNA.
Those skilled in the art will appreciate that all or part of the steps implementing the above embodiments are implemented as computer programs executed by a CPU. When executed by the CPU, performs the functions defined by the above-described methods provided by the present disclosure. The program may be stored in a computer readable storage medium, which may be a read-only memory, a magnetic or optical disk, or the like.
Furthermore, it should be noted that the above-mentioned figures are only schematic illustrations of the processes involved in the methods according to exemplary embodiments of the present disclosure, and are not intended to be limiting. It will be readily understood that the processes shown in the above figures are not intended to indicate or limit the chronological order of the processes. In addition, it is also readily understood that these processes may be performed synchronously or asynchronously, e.g., in multiple modules.
The following are embodiments of the disclosed apparatus that may be used to perform embodiments of the disclosed methods. For details not disclosed in the embodiments of the apparatus of the present disclosure, refer to the embodiments of the method of the present disclosure.
Fig. 6 is a block diagram illustrating a power distribution network fault locating device in accordance with an exemplary embodiment. As shown in fig. 6, the distribution network fault locating device 60 includes: an information module 602, a monitoring module 604, a fault module 606, and a location module 608.
The information module 602 is used for exchanging circuit information between the master intelligent power distribution terminal and the plurality of slave intelligent power distribution terminals; the method comprises the following steps: the method comprises the steps that a master intelligent power distribution terminal acquires a plurality of slave circuit information from a plurality of slave intelligent power distribution terminals; the master intelligent power distribution terminal sends master circuit information and the plurality of slave circuit information to the plurality of slave intelligent power distribution terminals.
The monitoring module 604 is used for performing circuit differential monitoring on any slave intelligent power distribution terminal based on circuit information; can include the following steps: any slave intelligent power distribution terminal is in circuit change with other adjacent slave intelligent power distribution terminals based on the circuit information; when the circuit change condition exceeds a threshold, a circuit differential is determined to be present.
The fault module 606 is configured to send fault information to the master intelligent power distribution terminal when any slave intelligent power distribution terminal monitors that a circuit differential exists between the slave intelligent power distribution terminal and another slave intelligent power distribution terminal;
the positioning module 608 is configured to perform fault positioning by the master intelligent power distribution terminal according to the fault information and a network topology structure of the power distribution network. Can include the following steps: the master intelligent power distribution terminal receives fault information from the slave intelligent power distribution terminal; and determining a fault area according to the fault information and the position of the slave intelligent power distribution terminal in the network topology structure.
According to the power distribution network fault positioning device disclosed by the invention, circuit information is exchanged between the master intelligent power distribution terminal and the plurality of slave intelligent power distribution terminals; any slave intelligent power distribution terminal carries out circuit differential monitoring based on circuit information; when any slave intelligent power distribution terminal monitors that a circuit differential exists between the slave intelligent power distribution terminal and other slave intelligent power distribution terminals, fault information is sent to the master intelligent power distribution terminal; the main intelligent power distribution terminal carries out fault positioning according to the fault information and the network topology structure of the power distribution network, so that feeder line faults in the power distribution network can be accurately and quickly positioned and isolated, and a fault power failure area can be isolated to the minimum; the problems of complex setting matching and poor selectivity of traditional power distribution network relay protection can be solved, and the large power failure risk caused by backup protection interlocking misoperation due to large-range fault trend transfer can be reduced.
Fig. 7 is a block diagram illustrating a power distribution network fault locating device in accordance with another exemplary embodiment. As shown in fig. 7, the distribution network fault location device 70 includes: a master intelligent power distribution terminal 702 and a plurality of slave intelligent power distribution terminals 704.
The master intelligent power distribution terminal 702 is used for exchanging circuit information among a plurality of slave intelligent power distribution terminals; receiving fault information, and positioning faults according to the fault information and a network topology structure of the power distribution network;
a plurality of slave intelligent power distribution terminals 704 for circuit differential monitoring based on circuit information; and when the circuit differential motion exists between the monitored intelligent power distribution terminal and other slave intelligent power distribution terminals, fault information is sent to the master intelligent power distribution terminal.
FIG. 8 is a block diagram illustrating an electronic device in accordance with an example embodiment.
An electronic device 800 according to this embodiment of the disclosure is described below with reference to fig. 8. The electronic device 800 shown in fig. 8 is only an example and should not bring any limitations to the functionality and scope of use of the embodiments of the present disclosure.
As shown in fig. 8, electronic device 800 is in the form of a general purpose computing device. The components of the electronic device 800 may include, but are not limited to: at least one processing unit 810, at least one memory unit 820, a bus 830 connecting the various system components (including the memory unit 820 and the processing unit 810), a display unit 840, and the like.
Wherein the storage unit stores program code executable by the processing unit 810 to cause the processing unit 810 to perform steps according to various exemplary embodiments of the present disclosure described in the electronic prescription flow processing method section described above in this specification. For example, the processing unit 810 may perform the steps shown in fig. 3 and 4.
The memory unit 820 may include readable media in the form of volatile memory units such as a random access memory unit (RAM) 8201 and/or a cache memory unit 8202, and may further include a read only memory unit (ROM) 8203.
The memory unit 820 may also include a program/utility 8204 having a set (at least one) of program modules 8205, such program modules 8205 including, but not limited to: an operating system, one or more application programs, other program modules, and program data, each of which, or some combination thereof, may comprise an implementation of a network environment.
The electronic device 800 may also communicate with one or more external devices 800' (e.g., keyboard, pointing device, bluetooth device, etc.), with one or more devices that enable a user to interact with the electronic device 800, and/or with any devices (e.g., router, modem, etc.) that enable the electronic device 800 to communicate with one or more other computing devices. Such communication may occur via input/output (I/O) interfaces 850. Also, the electronic device 800 may communicate with one or more networks (e.g., a Local Area Network (LAN), a Wide Area Network (WAN), and/or a public network, such as the internet) via the network adapter 860. The network adapter 860 may communicate with other modules of the electronic device 800 via the bus 830. It should be appreciated that although not shown, other hardware and/or software modules may be used in conjunction with the electronic device 800, including but not limited to: microcode, device drivers, redundant processing units, external disk drive arrays, RAID systems, tape drives, and data backup storage systems, among others.
Through the above description of the embodiments, those skilled in the art will readily understand that the exemplary embodiments described herein may be implemented by software, or by software in combination with necessary hardware. Therefore, as shown in fig. 9, the technical solution according to the embodiment of the present disclosure may be embodied in the form of a software product, which may be stored in a non-volatile storage medium (which may be a CD-ROM, a usb disk, a removable hard disk, etc.) or on a network, and includes several instructions to enable a computing device (which may be a personal computer, a server, or a network device, etc.) to execute the above method according to the embodiment of the present disclosure.
The software product may employ any combination of one or more readable media. The readable medium may be a readable signal medium or a readable storage medium. A readable storage medium may be, for example, but not limited to, an electronic, magnetic, optical, electromagnetic, infrared, or semiconductor system, apparatus, or device, or any combination of the foregoing. More specific examples (a non-exhaustive list) of the readable storage medium include: an electrical connection having one or more wires, a portable disk, a hard disk, a Random Access Memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber, a portable compact disc read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination of the foregoing.
The computer readable storage medium may include a propagated data signal with readable program code embodied therein, for example, in baseband or as part of a carrier wave. Such a propagated data signal may take many forms, including, but not limited to, electro-magnetic, optical, or any suitable combination thereof. A readable storage medium may also be any readable medium that is not a readable storage medium and that can communicate, propagate, or transport a program for use by or in connection with an instruction execution system, apparatus, or device. Program code embodied on a readable storage medium may be transmitted using any appropriate medium, including but not limited to wireless, wireline, optical fiber cable, RF, etc., or any suitable combination of the foregoing.
Program code for carrying out operations for the present disclosure may be written in any combination of one or more programming languages, including an object oriented programming language such as Java, C + + or the like and conventional procedural programming languages, such as the "C" programming language or similar programming languages. The program code may execute entirely on the user's computing device, partly on the user's device, as a stand-alone software package, partly on the user's computing device and partly on a remote computing device, or entirely on the remote computing device or server. In the case of a remote computing device, the remote computing device may be connected to the user computing device through any kind of network, including a Local Area Network (LAN) or a Wide Area Network (WAN), or may be connected to an external computing device (e.g., through the internet using an internet service provider).
The computer readable medium carries one or more programs which, when executed by a device, cause the computer readable medium to perform the functions of: circuit information is exchanged between the master intelligent power distribution terminal and the plurality of slave intelligent power distribution terminals; any slave intelligent power distribution terminal carries out circuit differential monitoring based on circuit information; when any slave intelligent power distribution terminal monitors that a circuit differential exists between the slave intelligent power distribution terminal and other slave intelligent power distribution terminals, fault information is sent to the master intelligent power distribution terminal; and the main intelligent power distribution terminal carries out fault positioning according to the fault information and the network topology structure of the power distribution network.
Those skilled in the art will appreciate that the modules described above may be distributed in the apparatus according to the description of the embodiments, or may be modified accordingly in one or more apparatuses unique from the embodiments. The modules of the above embodiments may be combined into one module, or further split into multiple sub-modules.
Through the above description of the embodiments, those skilled in the art will readily understand that the exemplary embodiments described herein may be implemented by software, or by software in combination with necessary hardware. Therefore, the technical solution according to the embodiments of the present disclosure may be embodied in the form of a software product, which may be stored in a non-volatile storage medium (which may be a CD-ROM, a usb disk, a removable hard disk, etc.) or on a network, and includes several instructions to enable a computing device (which may be a personal computer, a server, a mobile terminal, or a network device, etc.) to execute the method according to the embodiments of the present disclosure.
Exemplary embodiments of the present disclosure are specifically illustrated and described above. It is to be understood that the present disclosure is not limited to the precise arrangements, instrumentalities, or instrumentalities described herein; on the contrary, the disclosure is intended to cover various modifications and equivalent arrangements included within the spirit and scope of the appended claims.
Claims (7)
1. A power distribution network fault positioning method is characterized by comprising the following steps:
circuit information is exchanged between the master intelligent power distribution terminal and the plurality of slave intelligent power distribution terminals;
any slave intelligent power distribution terminal carries out circuit differential monitoring based on circuit information;
when any slave intelligent power distribution terminal monitors that a circuit differential exists between the slave intelligent power distribution terminal and other slave intelligent power distribution terminals, fault information is sent to the master intelligent power distribution terminal;
the main intelligent power distribution terminal carries out fault positioning according to the fault information and a network topology structure of the power distribution network;
the main intelligent power distribution terminal determines at least two target switches based on the fault area and the network topology;
sending a tripping instruction to the at least two target switches to perform fault isolation of the power distribution network;
the master intelligent power distribution terminal determines at least two target switches based on the fault region and the network topology, including:
the main intelligent power distribution terminal determines a differential mode based on the fault area and the network topological structure, wherein the differential mode comprises a current differential mode and a direction differential mode; the current differential is differential at two ends, and when the switch has branches at multiple ends, the direction differential mode is adopted for monitoring;
determining trip control logic based on the current differential mode or the direction differential mode; and
determining the at least two target switches based on the trip control logic;
any from intelligent power distribution terminal carries out circuit differential monitoring based on circuit information, includes:
any slave intelligent power distribution terminal is in circuit change with other adjacent slave intelligent power distribution terminals based on the circuit information;
when the circuit variation exceeds a threshold, it is determined that a circuit differential exists.
2. The method of claim 1, further comprising:
taking an intelligent power distribution terminal on a feeder outlet circuit breaker as a main intelligent power distribution terminal;
the intelligent power distribution terminals at the interconnection switches are used as slave intelligent power distribution terminals;
and connecting the master intelligent power distribution terminal and the plurality of slave intelligent power distribution terminals through a network to generate a network topology structure of the power distribution network.
3. The method of claim 1, wherein after exchanging circuit information between the master intelligent power distribution terminal and the plurality of slave intelligent power distribution terminals, further comprising:
and the master intelligent power distribution terminal and the plurality of slave intelligent power distribution terminals are synchronously adjusted based on clock signals of a ping-pong principle.
4. The method of claim 1, wherein exchanging circuit information between a master intelligent power distribution terminal and a plurality of slave intelligent power distribution terminals comprises:
the method comprises the steps that a master intelligent power distribution terminal acquires a plurality of slave circuit information from a plurality of slave intelligent power distribution terminals;
the master intelligent power distribution terminal sends master circuit information and the plurality of slave circuit information to the plurality of slave intelligent power distribution terminals.
5. The method of claim 1, wherein the master intelligent power distribution terminal performs fault location based on the fault information and a network topology of a power distribution network, comprising:
the master intelligent power distribution terminal receives fault information from the slave intelligent power distribution terminal;
and determining a fault area according to the fault information and the position of the slave intelligent power distribution terminal in the network topology structure.
6. The distribution network fault location device is suitable for the distribution network fault location method according to claim 1, and is characterized by comprising the following steps:
the information module is used for exchanging circuit information between the master intelligent power distribution terminal and the plurality of slave intelligent power distribution terminals;
the monitoring module is used for carrying out circuit differential monitoring on any slave intelligent power distribution terminal based on circuit information;
the fault module is used for sending fault information to the main intelligent power distribution terminal when any slave intelligent power distribution terminal monitors that circuit differential motion exists between the slave intelligent power distribution terminal and other slave intelligent power distribution terminals;
and the positioning module is used for positioning the fault by the main intelligent power distribution terminal according to the fault information and the network topology structure of the power distribution network.
7. A power distribution network fault location system, which is suitable for the power distribution network fault location method according to claim 1, and comprises:
the master intelligent power distribution terminal is used for exchanging circuit information among the plurality of slave intelligent power distribution terminals; receiving fault information, and positioning faults according to the fault information and a network topology structure of the power distribution network;
the slave intelligent power distribution terminals are used for carrying out circuit differential monitoring based on circuit information; and when the circuit differential motion exists between the monitored intelligent power distribution terminal and other slave intelligent power distribution terminals, fault information is sent to the master intelligent power distribution terminal.
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