Power distribution network fault section positioning method and device based on medium-voltage power line carrier, electronic equipment and storage medium

Abstract

A power distribution network fault section positioning method and device based on medium-voltage power line carrier, an electronic device and a storage medium, the method comprising: a node terminal sets up a corresponding medium-voltage power line carrier module, and establishes a communication link of each associated node of a power distribution network; each node terminal monitors the operating state of each corresponding node in real time, and judges whether the node has a fault based on the monitoring information; if there is a fault, a signal relay mode or a regional protection mode is selected according to different scenes, fault positioning is performed, and a fault section is isolated; after the fault section is successfully isolated, a tie switch is closed to restore power supply to a non-fault section. The present application realizes the minimization of positioning and isolation of the fault section of the power distribution network under the condition of limited communication, and improves the reliability and stability of the power system operation.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of medium-voltage power distribution network fault handling, and in particular to a power distribution network fault section positioning method and device based on medium-voltage power line carrier, an electronic device, and a storage medium. BACKGROUND

[0002] Fault section positioning is directly related to power distribution network power supply reliability, economic loss control, power equipment safety, smart grid development, and the improvement of power system management level, reduces the length and range of power outage, avoids the intensification of equipment damage, and helps the smart grid to realize self-healing control.

[0003] At present, power distribution automation terminals generally rely on optical fiber or wireless communication to interact with the power distribution master station, but the laying of optical fiber has high cost and great construction difficulty, and it is even more difficult in mountainous areas and the like, which limits its large-scale application. Moreover, wireless communication signals are easily disturbed, and in complex terrain areas such as mountainous areas, signals are blocked by mountains and the like, and the quality is unstable, and even interrupted. Moreover, the cost of building and maintaining base stations is high. These problems result in unsatisfactory power distribution automation coverage and online rate, insufficient monitoring and communication means. Once a fault occurs, it is difficult to quickly determine the location, and manual step-by-step investigation is inefficient, not only prolonging the power outage time, but also easily expanding the power outage range, affecting social production and life, and causing economic losses.

[0004] Prior art document 1 (CN101871988A) discloses a medium-voltage power distribution network positioning system and method using power line carrier communication, the system includes a plurality of nodes, each node has a number and fault information, and further includes a carrier communication network connected to the nodes and a host control and processing system connected to the carrier communication network. Prior art document 2 (CN107069676A) discloses a power distribution network fault positioning and rapid isolation recovery control method. Prior art document 3 (CN109347093A) discloses a power distribution network self-healing control method combining a master station with on-site control, which can utilize existing resources of on-site feeder automation terminal information to realize self-healing control of the power distribution network master station and voltage time type feeder automation cooperation, and realize rapid fault positioning suitable for various power distribution network topologies.

[0005] However, the existing technical document 1 does not conduct regional application scenarios and is only applicable to single-line ground fault handling. At the same time, each node of the system needs to be connected to the carrier communication network. Considering the interaction with the host control and processing system, the fault handling speed is slow, and the construction investment does not match the power supply reliability. The existing technical document 2 relies on the substation outgoing line protection action to trigger the distributed FA function. When the protection setting value is mismatched, it directly causes the fault to be unable to be isolated. At the same time, it causes unnecessary power outages in the non-fault section upstream of the fault point, affecting the power supply reliability, increasing the number of outgoing line switch actions, and affecting the life of the switch. The existing technical document 3 is only applicable to optical fiber or wireless coverage areas, relying on the information interaction between the terminal and the main station. When there is a fault in the area without signal coverage, it is impossible to achieve minimized isolation of the fault section. At the same time, the local voltage time-type feeder automation action time is long, and the upstream section of the fault point will be short-term power outage, and the fault isolation process will frequently open and close, and the impact current affects the stability of the system. Summary of the Invention

[0006] To address the deficiencies in the prior art, the present invention provides a method and device for locating a distribution network fault section based on a medium-voltage power line carrier, an electronic device, and a storage medium, which achieve minimized positioning and isolation of the distribution network fault section under conditions where optical fiber, wireless, and other communication are restricted, thereby improving the reliability and stability of power system operation.

[0007] This invention deploys medium-voltage power line carrier modules at wide-area nodes, enabling inter-node information exchange and local fault identification. Deployment at key nodes enables collaboration with the distribution automation master station to locate faulty sections, improving signal quality, enhancing fault handling efficiency, and increasing distribution automation coverage and uptime. Furthermore, while balancing cost and performance, this system achieves efficient fault location at a low cost, significantly enhancing the reliability and stability of power system operation.

[0008] The present invention adopts the following technical solutions.

[0009] A first aspect of the present invention provides a method for locating a fault section in a distribution network based on a medium voltage power line carrier, comprising:

[0010] Set up corresponding medium voltage power line carrier modules at the node terminals to establish communication links between the associated nodes of the distribution network;

[0011] Each node terminal monitors the operating status of each corresponding node in real time and obtains monitoring information;

[0012] Each node terminal determines whether a fault has occurred at that node based on its own monitoring information. If a fault occurs, regional protection mode is used to locate and isolate the fault. Specifically, the fault information is transmitted to the associated node terminal via the corresponding medium-voltage power line carrier module in conjunction with the communication link. This information is then exchanged between the node terminals, and the fault is located based on the exchanged information, isolating the faulty section.

[0013] After the fault section is successfully isolated, power supply to the non-fault section is restored by closing the interconnecting switch.

[0014] The method further comprises:

[0015] Depending on different scenarios, the signal relay mode or regional protection mode is selected for fault location and isolation. The signal relay mode includes: the node terminal transmits the fault information to the distribution automation master station, and the distribution automation master station locates the fault based on the fault information and isolates the fault section.

[0016] Optionally, the medium-voltage power line carrier module includes a communication unit and a capacitor coupler connected in sequence, the node terminal is connected to the communication unit, and is connected to the medium-voltage power line through the capacitor coupler; the communication unit transmits the monitoring information obtained by the node terminal to the capacitor coupler, which converts the monitoring information into a carrier signal through the capacitor coupler and then couples it to the medium-voltage power line for transmission to the corresponding associated node terminal.

[0017] Optionally, in regional protection mode, the fault information is transmitted to the associated node terminal via the corresponding medium voltage power line carrier module, including:

[0018] According to the communication links of the associated nodes of the distribution network, the area surrounded by the action node and the terminal node, which no longer contains any action node, is regarded as the minimum isolation section;

[0019] The fault information is transmitted to all node terminals within the minimum isolation section where the fault point is located through the corresponding medium voltage power line carrier module.

[0020] Optionally, locate the fault based on the interaction information and isolate the faulty section, including:

[0021] Each node terminal within the minimum isolation segment obtains the interaction information transmitted by the corresponding associated node;

[0022] Determine the fault section where the fault point is located according to the event signal in the interactive information;

[0023] When the fault point is located within the minimum isolation section, all nodes in the minimum isolation section where the fault point is located will perform a tripping action, and all nodes in the minimum isolation section where the non-fault point is located will be locked.

[0024] Optionally, the event signal in the interaction information includes an internal fault and an external fault. Determining the fault section where the fault point is located according to the event signal in the interaction information includes:

[0025] Each node terminal analyzes the event signal in the interaction information;

[0026] Traverse each minimum isolation section, when there is and only one in-zone fault in the minimum isolation section and there is an out-zone fault, then the current minimum isolation section is the fault section where the fault point is located, if there are two in-zone faults in the minimum isolation section or all are out-zone faults, then the current minimum isolation section is a non-fault section.

[0027] Optionally, in the signal relay mode, the power distribution automation master station performs fault positioning and isolates the fault section according to the fault information, and the method comprises the following steps of:

[0028] Obtaining power distribution network topology information;

[0029] Determining the fault section where the fault point is located based on preset processing logic and the fault information;

[0030] Finding the nearest nodes on both sides of the fault point in the power distribution network topology information according to the fault section;

[0031] The power distribution automation master station issues a first remote control command to the nearest nodes on both sides of the fault;

[0032] The nearest nodes on both sides of the fault switch action to isolate the fault section after receiving the first remote control command.

[0033] Optionally, a capacitor coupler is additionally installed on each side of the tie switch, and the two capacitor couplers are connected to the same communication unit, when the tie switch is closed, the carrier signal is directly transmitted through the switch, and when the tie switch is opened, the carrier signal is transmitted through the internal bridging of the capacitor couplers on both sides.

[0034] Optionally, in the area protection mode, when the medium-voltage power line carrier link is abnormal, the fault information is transmitted to the associated node terminal through the corresponding medium-voltage power line carrier module to form interaction information of each node terminal, the node terminal transmits the interaction information to the power distribution automation master station, and the power distribution automation master station performs fault positioning and isolates the fault section according to the interaction information.

[0035] Optionally, the power supply of the non-fault section is restored by closing the tie switch, and the method comprises the following steps of:

[0036] In the signal relay mode, the power distribution automation master station issues a second remote control command to the corresponding tie switch to control the corresponding tie switch to close to restore the power supply of the non-fault section;

[0037] In the area protection mode, the node of the isolated minimum section where the fault point is located transmits a fault section isolation success signal to the corresponding tie switch to control the corresponding tie switch to close to restore the power supply of the non-fault section.

[0038] The second aspect of the application provides a power distribution network fault section positioning device based on a medium-voltage power line carrier, and the device comprises:

[0039] The establishment module is configured to establish a communication link of each associated node of the power distribution network.

[0040] The fault locating and isolating module is configured to locate and isolate the fault in the case of a fault by using a zone protection mode, and specifically includes: transmitting the fault information to the associated node terminal via the corresponding medium voltage power line carrier module in combination with the communication link, forming interactive information of each node terminal, locating the fault according to the interactive information, and isolating the fault section.

[0041] The recovery module is configured to restore power supply to the non-fault section by closing the tie switch after the fault section is successfully isolated.

[0042] Optionally, the fault locating and isolating module selects to locate and isolate the fault by using a signal relay mode or a zone protection mode according to different scenarios, and locating and isolating the fault by using the signal relay mode includes: transmitting the fault information to the power distribution automation master station by the node terminal, and locating the fault and isolating the fault section according to the fault information by the power distribution automation master station.

[0043] Optionally, the medium voltage power line carrier module includes a communication unit and a capacitor coupler connected in sequence, the node terminal is connected with the communication unit, and the communication unit is connected with the medium voltage power line through the capacitor coupler; the communication unit transmits the monitoring information obtained by the node terminal to the capacitor coupler, and the capacitor coupler converts the monitoring information into a carrier signal and couples the carrier signal to the medium voltage power line to transmit the carrier signal to the corresponding associated node terminal.

[0044] Optionally, when the fault locating and isolating module locates and isolates the fault by using the zone protection mode, transmitting the fault information to the associated node terminal via the corresponding medium voltage power line carrier module includes:

[0045] According to the communication link of each associated node of the power distribution network, an area surrounded by the action node and the terminal node and not containing the action node is taken as the minimum isolation section.

[0046] The fault information is transmitted to all node terminals in the minimum isolation section where the fault point is located via the corresponding medium voltage power line carrier module.

[0047] Optionally, when the power distribution automation master station locates the fault and isolates the fault section according to the interactive information, it includes:

[0048] Each node terminal in the minimum isolation section acquires the interactive information transmitted by the corresponding associated node;

[0049] According to the event signal in the interactive information, the fault section where the fault point is located is determined;

[0050] When the fault point is located in the minimum isolation section, all nodes in the minimum isolation section where the fault point is located perform tripping actions, and all nodes in the minimum isolation section where the non-fault point is located are locked.

[0051] Optionally, the event signal in the interaction information comprises an in-zone fault and an out-zone fault, and the power distribution automation master station comprises the following when determining the fault section where the fault point is located according to the event signal in the interaction information:

[0052] Each node terminal analyzes the event signal in the interaction information;

[0053] Each minimum isolation section is traversed, and when there is only one in-zone fault in the minimum isolation section and there is an out-zone fault, the current minimum isolation section is the fault section where the fault point is located; if there are two in-zone faults in the minimum isolation section or all are out-zone faults, the current minimum isolation section is a non-fault section.

[0054] Optionally, when the fault locating and isolating module adopts the signal relay mode, the power distribution automation master station comprises the following when locating the fault according to the fault information and isolating the fault section:

[0055] Obtaining power distribution network topology information;

[0056] Determining the fault section where the fault point is located based on preset processing logic and the fault information;

[0057] Finding the nearest nodes on both sides of the fault point in the fault section according to the power distribution network topology information;

[0058] The power distribution automation master station issues a first remote control command to the nearest nodes on both sides of the fault;

[0059] The nearest nodes on both sides of the fault switch action to isolate the fault section after receiving the first remote control command.

[0060] Optionally, the device further comprises a capacitor coupler installed on both sides of the tie switch, and the two capacitor couplers are connected to the same communication unit; when the tie switch is closed, the carrier signal is directly transmitted through the switch; and when the tie switch is opened, the carrier signal is transmitted through the internal bridging of the capacitor couplers on both sides.

[0061] Optionally, when the fault locating and isolating module adopts the area protection mode, the fault information is transmitted to the associated node terminal through the corresponding medium-voltage power line carrier module when the medium-voltage power line carrier link is abnormal, forming the interaction information of each node terminal; the node terminal transmits the interaction information to the power distribution automation master station; and the power distribution automation master station locates the fault according to the interaction information and isolates the fault section.

[0062] Optionally, when the recovery module restores power supply to the non-fault section by closing the tie switch, the recovery module comprises the following:

[0063] When the fault locating and isolating module adopts the signal relay mode, the power distribution automation master station issues a second remote control command to the corresponding tie switch to control the corresponding tie switch to close to restore power supply to the non-fault section.

[0064] When the fault location and isolation module adopts the zone protection mode, the node of the smallest section of the isolation of the fault point transmits a fault section isolation success signal to the corresponding tie switch to control the closing of the corresponding tie switch to restore power supply of the non-fault section.

[0065] The third aspect of the present application provides an electronic device comprising a memory, a processor and a computer program stored in the memory and executable on the processor, wherein the computer program implements the above-mentioned fault section locating method for power distribution network based on medium voltage power line carrier wave when loaded into the processor.

[0066] The fourth aspect of the present application provides a computer readable storage medium, wherein the computer readable storage medium stores a computer program, and the computer program implements the above-mentioned fault section locating method for power distribution network based on medium voltage power line carrier wave when executed by a processor.

[0067] Compared with the prior art, the present application has at least the following beneficial effects:

[0068] 1) The present application realizes multi-communication mode collaborative mode by fusing power line carrier wave with optical fiber / wireless communication, takes the carrier module as a "communication relay", solves the problems of insufficient coverage of optical fiber / wireless communication and low terminal online rate in remote areas, and realizes fault on-site isolation by preferentially adopting regional protection mode, thereby improving the rapidity and reliability of on-site fault disposal, and being applicable to short-circuit fault and single-phase grounding fault, and being capable of switching to a relay mode when a communication link of a part of nodes is abnormal, and having redundancy.

[0069] 2) The present application improves the adaptability and compatibility in different scenarios by combining the signal relay mode and the local autonomy mode in the dual-mode collaborative mechanism of the master station centralized control, and only needs to perform one switching operation on the switch during the fault section isolation process of the relay mode or the regional protection mode, does not affect the power supply of the upstream section of the fault point, and can improve the system operation stability, the switch operation life and the fault disposal rapidity.

[0070] 3) The present application realizes rapid fault location and isolation by constructing a minimum isolation region of a fault section by using action nodes and terminal nodes, and improves the fault disposal rapidity. Whether in the signal relay mode or the regional protection mode, the fault section is directly cut off by the switches near the fault point, and the present application does not need to cooperate with the out-of-station protection, thereby reducing the power supply recovery time, and improving the reliability and rapidity of fault disposal, and when the communication link is abnormal or the fault isolation fails, the master station can be used as a backup to minimize the isolation of the fault section.

[0071] 4) The application realizes transmission through the switch when closed and transmission through bridging when opened by configuring the capacitor coupler on both sides of the switch, solving the problem of signal interruption of traditional carrier wave when the switch is opened.

[0072] 5) The application realizes that each node only establishes a communication link with an associated node by configuring a unique identification code, reduces redundant connections, and at the same time, uses a hardware encryption chip at the data transmission layer to improve communication efficiency and security.

[0073] The above merely describes preferred embodiments of the application and is not intended to limit the application, and any modifications, equivalent replacements, and improvements made within the spirit and principle of the application shall be included in the protection scope of the application. BRIEF DESCRIPTION OF DRAWINGS

[0074] In order to more clearly illustrate the technical solutions of the embodiments of the application, the drawings needed in the embodiment description will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the application, and for those skilled in the art, other drawings can also be obtained without creative labor. Among them:

[0075] Figure 1 A medium-voltage power line carrier-based power distribution network fault section positioning method flowchart for a specific embodiment of the application;

[0076] Figure 2 A medium-voltage power line carrier-based power distribution network fault section positioning method application diagram for another specific embodiment of the application;

[0077] Figure 3 A medium-voltage power line carrier-based power distribution network fault section positioning method application diagram for another specific embodiment of the application. DETAILED DESCRIPTION

[0078] Reference will now be made to the drawings to describe the exemplary embodiments of the application in detail. However, the application can be implemented in many different forms and is not limited to the embodiments described herein. These embodiments are provided to fully and completely disclose the application and to fully convey the scope of the application to those skilled in the art. The terms used in the exemplary embodiments shown in the drawings are not limited to the application. In the drawings, the same elements / elements are denoted by the same reference numerals.

[0079] Unless otherwise defined, the terms used herein (including technical terms) have the meanings commonly understood by those skilled in the art. In addition, it can be understood that the terms defined in commonly used dictionaries should be understood in the context of their related art, and should not be understood in an idealized or overly formal sense.

[0080] As Figure 1 shown in the figure, embodiment 1 of the present application provides a power distribution network fault section positioning method based on medium voltage power line carrier, each node of the power distribution network is configured with a power distribution automation feeder terminal, the method comprises the following steps:

[0081] S1: setting a corresponding medium voltage power line carrier module at the node terminal, establishing a communication link of each associated node of the power distribution network. Configuring a corresponding identification code for each node terminal of the line in the power distribution network, and establishing a communication link of each node terminal according to the corresponding identification code.

[0082] Optionally, the node terminal identification code comprises a node identification code and an associated node identification code, and the node terminal identification code is determined according to the line number of the node, the node position type and the node device number. The node position type includes section, branch and boundary. The section type node includes transformer substation outgoing switch, section switch and tie switch.

[0083] Specifically, the unique identification code configuration method is shown in Table 1:

[0084] Table 1

[0085]

[0086] In Table 1, Lxxx represents the line number, L represents the line, and three digits represent the line number; Tx represents the current node position type, T represents the type, and the number 1 represents the section, the number 2 represents the branch, and the number 3 represents the boundary; Sxxx represents the current node device number, S represents the serial number, and three digits represent the device number.

[0087] By configuring the node and associated node identification code, each node only establishes a communication link with the associated node. In this way, it can reduce redundant connection, reduce communication network congestion, reduce conflict or packet loss caused by redundant connection, improve communication quality, and reduce communication overhead.

[0088] S2: each node terminal monitors the running state of each corresponding node in real time, and obtains monitoring information.

[0089] The running state includes power parameter information, device state information and link quality information. The power parameter information includes node voltage, current, power and the like, the device state information includes node switch state and the like; the link quality information includes node communication state and the like.

[0090] S3: Each node terminal judges whether the node terminal has a fault based on the self monitoring information; if there is a fault, a signal relay mode and / or a regional protection mode are selected according to different scenarios; in the regional protection mode, the fault information is transmitted to the associated node terminal through the corresponding medium voltage power line carrier module in combination with the communication link to form the interaction information of each node terminal, the fault is located according to the interaction information, and the fault section is isolated; in the signal relay mode, the node terminal transmits the fault information to the distribution automation master station, the distribution automation master station locates the fault according to the fault information, and the fault section is isolated.

[0091] Optionally, the medium voltage power line carrier module comprises a communication unit and a capacitive coupler connected in sequence, the node terminal is connected with the communication unit, and the node terminal is connected with the medium voltage power line through the capacitive coupler; the communication unit transmits the monitoring information obtained by the node terminal to the capacitive coupler, and the monitoring information is converted into a carrier signal by the capacitive coupler and then coupled to the medium voltage power line to be transmitted to the corresponding associated node terminal.

[0092] In this embodiment, the monitoring information is converted into a carrier signal for transmission on the power line to determine the fault section, which can improve the real-time performance and speed of fault determination. Moreover, the fault isolation is realized in the case of limited communication with the master station, which improves the reliability and stability of the power system operation.

[0093] The monitoring information also includes telemetry, telecontrol, remote control data and event signals, the event signals in the monitoring information contain fault information when there is a fault, and the fault information includes but is not limited to overcurrent protection alarm, ground protection alarm and the like.

[0094] Each node terminal judges whether the node terminal has a fault based on the self monitoring information, and actively transmits data to the associated node terminal if there is a fault. Specifically, it includes:

[0095] Each node terminal uses voltage and current electrical quantity information to determine short-circuit faults, ground faults and the like; a fiber / wireless communication coverage node or a neighboring carrier node is used as an associated node, and data is actively transmitted to the associated node when there is a fault; the signal relay mode or the regional protection mode is selected for data transmission according to different scenarios. In the signal relay transmission mode, the node terminal periodically transmits data to the associated node, a signal coverage area node terminal is selected as a collection point, the data is collected locally and then uploaded to the distribution automation master station for decryption through an encryption chip; when the fault is determined, the fault information is immediately transmitted; in the regional protection transmission mode, the node terminal data is transmitted to all nodes in the minimum isolation section through an encryption algorithm.

[0096] Optionally, the fault isolation mode includes a signal relay mode and a regional protection mode, and the data transmission format is set according to different fault isolation modes, specifically including:

[0097] 1) In the signal relay mode, the data transmission format between the node and the power distribution automation master station is as shown in Table 2:

[0098] Table 2

[0099]

[0100] In the signal relay mode, the node periodically transmits data to the associated node, and after local collection, it is sent to the power distribution automation master station for decryption.

[0101] 2) In the area protection mode, the data transmission format between the nodes is as shown in Table 3:

[0102] Table 3

[0103]

[0104] In the area protection transmission mode, the node data is transmitted to all nodes in the minimum isolation section through an encryption algorithm such as SM2 / SM4 national encryption algorithm.

[0105] Optionally, in S3, in the area protection mode, the fault information is transmitted to the associated node terminal through the corresponding medium-voltage power line carrier module, including:

[0106] According to the communication link of each associated node of the power distribution network, the internal area surrounded by the action node and the terminal node without the action node is taken as the minimum isolation section;

[0107] The fault information is transmitted to all node terminals in the minimum isolation section where the fault point is located through the corresponding medium-voltage power line carrier module.

[0108] It can be understood that the minimum isolation section where the fault point is located is the terminal at the switch directly connected to the fault point, and the surrounding area.

[0109] It can be understood that the action node is a node that has the condition of controlling the switch to isolate the fault, and the fault point is generally a short circuit fault or the like that affects equipment and personal safety.

[0110] Further, in S3, according to the interaction information, the fault is located and the fault section is isolated, including:

[0111] Each node terminal in the minimum isolation section obtains the interaction information transmitted by the corresponding associated node;

[0112] According to the event signal in the interaction information, the fault section where the fault point is located is determined;

[0113] When the fault point is located in the minimum isolation section, the node in the minimum isolation section where the fault point is located trips, and all nodes in the minimum isolation section where the non-fault point is located are locked.

[0114] Further, the fault section where the fault point is located is determined according to the event signal in the interaction information, including:

[0115] The terminal interaction fault information includes an in-zone fault and an out-zone fault, and the information is transmitted to a neighboring node terminal, each node terminal analyzes the interaction information, when there is only one in-zone fault in the minimum isolation section and there is an out-zone fault, the current section is the fault section and the fault point is located in the fault section; when there are two in-zone faults or all are out-zone faults, the current section is a non-fault section.

[0116] The in-zone fault and the out-zone fault are determined by the node terminal according to the position of the fault point relative to the terminal, if the fault point is located downstream of the node terminal, it is an in-zone fault, otherwise it is an out-zone fault.

[0117] In this embodiment, when the fault point is located in the minimum isolation section, the trip isolates the fault point, the upstream of the fault point is still connected with the power supply and will not lose power, so the power loss range is minimized; the switch downstream of the fault point is tripped, in order to provide conditions for subsequent tie transfer restoration and speed up the power supply recovery of the load downstream of the fault point. When the fault point is not in the minimum isolation section, all nodes in the minimum isolation section where the non-fault point is located are locked, which can prevent misoperation from expanding the isolation section or the power loss range and reduce the impact on the subsequent tie transfer restoration.

[0118] Optionally, in the signal relay mode, the power distribution automation master station performs fault positioning according to the fault information and isolates the fault section, including:

[0119] Obtaining power distribution network topology information;

[0120] Determining the fault section where the fault point is located based on a preset processing logic and the fault information;

[0121] Finding the nearest nodes on both sides of the fault point in the power distribution network topology information according to the fault section;

[0122] The power distribution automation master station issues a first remote control command to the nearest nodes on both sides of the fault point;

[0123] The nearest nodes on both sides of the fault point act on the switch to isolate the fault section after receiving the first remote control command.

[0124] Specifically, the fault section where the fault point is located is determined based on a preset processing logic and the fault information, specifically including:

[0125] The switching state of the power distribution network is converted into a matrix model, and a logic equation is constructed through a switching combination through which the fault current flows, the switching combination including "0" and "1" states, "1" representing overcurrent and "0" representing no overcurrent, when a section fault judgment vector is greater than 0, the section is a fault section, otherwise, the section is a non-fault section, and the method is mainly applicable to a radial simple network.

[0126] It can be understood that the fault section in which the fault point is located can also be determined based on many existing technical solutions according to preset processing logic and fault information, and the embodiment is not limited.

[0127] In this embodiment, only one switching operation is required for the switching in the fault section isolation process, regardless of the signal relay mode or the area protection mode, which does not affect the power supply of the upstream section of the fault point, and can improve the system operation stability, switching operation life and fault handling speed. Moreover, regardless of the signal relay mode or the area protection mode, the fault section is directly removed by the switching near the fault point, which is different from the traditional method of isolating the fault by the substation outlet switch. The present application does not need to cooperate with the substation outlet protection, which reduces the power supply recovery time, and therefore improves the reliability and speed of fault handling.

[0128] In this embodiment, the minimum isolation area is set, the fault point is found in the minimum isolation area, and the corresponding operation is performed, so that the power outage range is small, the load power supply of the non-fault section can be maximally recovered, and the power supply reliability is improved.

[0129] Further, in the area protection mode, when the medium-voltage power line carrier link is abnormal, the fault information is transmitted to the associated node terminal through the corresponding medium-voltage power line carrier module, the interaction information of each node terminal is formed, the node terminal transmits the interaction information to the power distribution automation master station, the power distribution automation master station locates the fault according to the interaction information, and isolates the fault section.

[0130] It can be understood that whether the medium-voltage power line carrier link is normal can be determined by the heartbeat message between the terminals. When the heartbeat message meets the preset requirements, it is considered that the real-time performance and rate of the medium-voltage power line carrier channel meet the preset requirements, and it is considered that the medium-voltage power line carrier link is normal, otherwise, it is abnormal. It can be understood that when the medium-voltage power line carrier link is abnormal, the real-time performance is weak or interrupted. At this time, only the fault information can be transmitted to the adjacent terminal, and the power distribution network automation master station is cooperated to isolate the fault.

[0131] In this way, when the medium-voltage carrier link signal is abnormal, the power distribution automation master station isolates the fault based on the event signals uploaded by each node, minimizes the isolation of the fault section by taking the power distribution network automation as a backup, the master station collects the fault event signals uploaded by the terminal to the master station, analyzes through a fault locating algorithm combined with the power grid topology structure, which is equivalent to the signal relay mode, and through the dual-mode cooperation mechanism, the reliability and speed of fault handling are improved.

[0132] Further, the contact switch is respectively provided with a capacitor coupler on both sides, and the two capacitor couplers are connected to the same communication unit; when the contact switch is closed, the carrier signal is directly transmitted through the switch; and when the contact switch is opened, the carrier signal is transmitted through the internal bridging of the capacitor couplers on both sides.

[0133] In this way, by configuring the capacitor couplers on both sides of the switch, the transmission through the switch when closed and the transmission through the bridging when opened are realized, the problem of signal interruption of the traditional carrier when the switch is opened is solved, and the speed of fault positioning is further improved.

[0134] In some embodiments, the regional protection mode is preferentially adopted to realize fault isolation in place, since the power line carrier has high real-time performance and fast transmission speed under normal conditions, the fault in place can be disposed quickly and reliably, and the regional protection mode is suitable for short-circuit faults and single-phase grounding faults; when the communication link of a part of nodes is abnormal, the relay mode can be switched to, and the relay mode has redundancy.

[0135] Further, if the nodes determine that the minimum isolation zones where the fault points are located are different, one minimum isolation zone segment above or below the minimum isolation zone segment is merged for judgment.

[0136] In this way, the fault isolation and power supply recovery can be preferentially completed, and the main station can further finely isolate by combining the event information sent up, the topology and the system operation state.

[0137] S4: after the fault zone isolation is successful, the power supply of the non-fault zone segment is restored through the closing of the contact switch.

[0138] In S4, the power supply of the non-fault zone segment is restored through the closing of the contact switch, including:

[0139] In the signal relay mode, the power distribution automation main station sends a second remote control command to the corresponding contact switch to control the corresponding contact switch to close to restore the power supply of the non-fault zone segment;

[0140] In the regional protection mode, the node in the minimum isolation zone where the fault point is located transmits a fault zone isolation success signal to the corresponding contact switch to control the corresponding contact switch to close in place to restore the power supply of the non-fault zone segment.

[0141] The application of the method provided in Embodiment 1 in different scenarios will be introduced below.

[0142] As shown in FIG. 1, the embodiment of the present application provides an application schematic diagram of a power distribution network fault zone positioning method based on a medium-voltage power line carrier. Figure 2

[0143] Figure 2 ​In the middle, substation outgoing switch CB1, CB2, section switch FS1, FS2, contact switch LSW through optical fiber / wireless communication with distribution automation master station to establish vertical communication link, section switch FS3 is located in the no communication coverage area, at this time, the nearest associated node of optical fiber or wireless communication coverage is FS2, therefore, the node and in the no communication coverage area and the nearest associated node are all set medium voltage carrier communication module, construct horizontal communication link, carrier equipment includes capacitor coupler and communication unit, respectively configure unique identification code, as follows:

[0144] Section switch FS2 is shown in Table 4:

[0145] Table 4

[0146]

[0147] Section switch FS3 is shown in Table 5:

[0148] Table 5

[0149]

[0150] The terminal at FS3 is directly connected with the communication unit, periodically transmits data to the capacitor coupler, and then couples to the medium voltage power line after converting the carrier signal to transmit to the associated node FS2, and then uploads to the distribution automation master station after local collection and encryption chip decryption.

[0151] Taking the backbone line fault between section switches FS2 and FS3 as an example, FS2 and FS3 both detect the fault locally, so the periodic transmission mode is switched to the active upload mode. FS3 is located downstream of the fault point and has no overcurrent event signal; CB1, FS1 and FS2 are located upstream of the fault point and all have overcurrent protection alarms, wherein CB1 and FS1 directly upload the event signal to the distribution automation master station, and FS2 receives the data transmitted by FS3 and uploads to the master station after collection.

[0152] The distribution automation master station locates the fault point between section switches FS2 and FS3 based on the network topology through the overcurrent protection alarm signal, and issues remote control commands to FS2 and FS3, wherein the remote control command of FS3 is received by FS2 and converted into a carrier signal, and then coupled to the power line for transmission, and FS3 receives the carrier signal and executes after analysis and decryption, and finally completes the fault section isolation.

[0153] The distribution automation master station monitors the system operation state in real time, and issues an encrypted remote control command to the contact switch LSW after confirming the successful isolation of the fault, and restores the power supply of the non-fault section after closing.

[0154] In this embodiment, when the communication is limited and the carrier module is insufficient, the node terminal in the communication-free area interacts with the node terminal in the area covered by optical fiber or wireless communication through the carrier module, cooperates with the power distribution automation master station to locate and isolate faults, and improves the reliability and stability of power system operation.

[0155] As Figure 3 shown in the application embodiment of the present application, another application schematic diagram of the power distribution network fault section positioning method based on medium voltage power line carrier.

[0156] Figure 3 In this embodiment, the transformer outlet switch CB1, CB2, the sectionalizing switch FS1, FS2, FS3, and the tie switch LSW are connected to the power distribution automation master station through optical fiber / wireless communication to establish a longitudinal communication link.

[0157] Based on the principle that the area surrounded by the action node and the terminal node without the action node in the interior is the minimum isolation section, the horizontal communication link is constructed between the outlet switch CB1 and the sectionalizing switch FS1, between the sectionalizing switches FS1, FS2 and the branch switches FZS1, FZS2, between the sectionalizing switches FS2, FS3 and the branch switch FZS3, and between the sectionalizing switch FS3 and the tie switch LSW based on the medium voltage power line carrier, that is, the above-mentioned switches are equipped with medium voltage carrier communication devices, including a capacitive coupler and a communication unit. In addition, a capacitive coupler is additionally installed on both sides of the tie switch LSW and connected to the same communication unit, which directly transmits through the switch when closed and transmits through the internal bridge of the capacitive coupler on both sides when opened.

[0158] The above-mentioned switches are configured with unique identification codes, which are as follows:

[0159] The transformer outlet switch CB1 is shown in Table 6:

[0160] Table 6

[0161]

[0162] The sectionalizing switch FS1 is shown in Table 7:

[0163] Table 7

[0164]

[0165] The sectionalizing switch FS2 is shown in Table 8:

[0166] Table 8

[0167]

[0168] The sectionalizing switch FS3 is shown in Table 9:

[0169] Table 9

[0170]

[0171] The sectional switch FZS1 is shown in Table 10:

[0172] Table 10

[0173]

[0174] The sectional switch FZS2 is shown in Table 11:

[0175] Table 11

[0176]

[0177] The sectional switch FZS3 is shown in Table 12:

[0178] Table 12

[0179]

[0180] The tie switch LSW is shown in Table 13:

[0181] Table 13

[0182]

[0183] Taking the trunk line fault between the sectional switches FS2 and FS3 as an example, the FS2 and FS3 both detect the fault locally, the FS3 is located downstream of the fault point, and there is no overcurrent event signal; the CB1, FS1 and FS2 are located upstream of the fault point, and all overcurrent protection alarms, the terminals in each regional protection perform horizontal information interaction through the power line, and simultaneously send the event signal to the distribution automation master station.

[0184] According to the principle that the fault point is located in the protection area only when there is one terminal overcurrent protection alarm, it is determined that the fault point is between the sectional switches FS2 and FS3, the FS2 and FS3 actuate tripping, and the fault section isolation is completed.

[0185] The sectional switch FS2 transmits the "isolation success" signal to the FS3, and then the FS3 transmits the signal to the tie LSW, the LSW restores the non-fault power supply by checking the no-voltage closing, and the no-voltage closing is not allowed to close when there is pressure on one side, thereby avoiding causing non-synchronous closing and affecting the system operation stability.

[0186] At the same time, considering the case that the power line carrier channel is abnormal, so that the fault section positioning and isolation cannot be performed locally, at this time, the distribution automation master station locates the fault section based on the network topology according to the overcurrent protection alarm signal, issues a remote control command to the corresponding switches FS2 and FS3 to complete the fault isolation, and after confirming the success of the fault isolation, issues an encrypted remote control command to the tie switch LSW, and after closing, restores the power supply of the non-fault section.

[0187] In this embodiment, when the carrier module covers the whole area, each adjacent node terminal realizes in-situ positioning and isolation of the fault section through carrier module information interaction; meanwhile, through the installation of a capacitive coupler on both sides of the tie switch, the signal can still be reliably transmitted when the switch is disconnected. The application realizes the minimization of positioning and isolation of the fault section of the distribution network under the condition of limited communication, and improves the reliability and stability of the power system operation.

[0188] Embodiment 2 of the application provides a distribution network fault section positioning device based on a medium-voltage power line carrier, which runs the distribution network fault section positioning method based on the medium-voltage power line carrier as described in Embodiment 1, and the device comprises

[0189] A building module is configured to build a communication link of each associated node of the distribution network;

[0190] A fault positioning and isolation module is configured to select a signal relay mode or a regional protection mode according to different scenarios in the case of a fault, in the regional protection mode, the fault information is transmitted to the associated node terminal through the corresponding medium-voltage power line carrier module in combination with the communication link, the interactive information of each node terminal is formed, the fault positioning is performed according to the interactive information, and the fault section is isolated; in the signal relay mode, the node terminal transmits the fault information to the distribution automation master station, the distribution automation master station performs fault positioning according to the fault information, and the fault section is isolated;

[0191] A recovery module is configured to restore the power supply of the non-fault section through the closing of the tie switch after the isolation of the fault section is successful.

[0192] Optionally, the fault positioning and isolation module selects to adopt the signal relay mode or the regional protection mode for fault positioning and isolation according to different scenarios, and the signal relay mode comprises: the node terminal transmits the fault information to the distribution automation master station, and the distribution automation master station performs fault positioning according to the fault information and isolates the fault section.

[0193] Optionally, the medium-voltage power line carrier module comprises a communication unit and a capacitive coupler connected in sequence, the node terminal is connected with the communication unit, and the node terminal is connected with the medium-voltage power line through the capacitive coupler; the communication unit transmits the monitoring information obtained by the node terminal to the capacitive coupler, and the capacitive coupler converts the monitoring information into a carrier signal and couples the carrier signal to the medium-voltage power line to transmit the carrier signal to the corresponding associated node terminal.

[0194] Optionally, the fault positioning and isolation module adopts the regional protection mode for fault positioning and isolation, and when the fault information is transmitted to the associated node terminal through the corresponding medium-voltage power line carrier module, the method comprises:

[0195] According to the communication link of each associated node of the distribution network, the region surrounded by the action node and the terminal node and not containing the action node is taken as the minimum isolation section.

[0196] The fault information is transmitted to all node terminals in the minimum isolation section where the fault point is located through the corresponding medium voltage power line carrier module.

[0197] Optionally, the power distribution automation master station, when performing fault locating and isolating a fault section according to the interaction information, comprises:

[0198] Each node terminal in the minimum isolation section acquires the interaction information transmitted by the corresponding associated node;

[0199] The fault section where the fault point is located is determined according to the event signal in the interaction information;

[0200] When the fault point is located in the minimum isolation section, all nodes in the minimum isolation section where the fault point is located perform tripping actions, and all nodes in the minimum isolation section where the non-fault point is located are locked out.

[0201] Optionally, the event signal in the interaction information comprises an in-zone fault and an out-zone fault, and the power distribution automation master station, when determining the fault section where the fault point is located according to the event signal in the interaction information, comprises:

[0202] Each node terminal analyzes the event signal in the interaction information;

[0203] Each minimum isolation section is traversed, and when there is only one in-zone fault in the minimum isolation section and there is an out-zone fault, the current minimum isolation section is the fault section where the fault point is located, and if there are two in-zone faults in the minimum isolation section or all are out-zone faults, the current minimum isolation section is a non-fault section.

[0204] Optionally, when the fault locating and isolating module adopts a signal relay mode, the power distribution automation master station, when performing fault locating and isolating a fault section according to the fault information, comprises:

[0205] Acquiring power distribution network topology information;

[0206] Determining the fault section where the fault point is located based on preset processing logic and the fault information;

[0207] Finding the nearest nodes on both sides of the fault point in the power distribution network topology information according to the fault section;

[0208] The power distribution automation master station issues a first remote control command to the nearest nodes on both sides of the fault point;

[0209] The nearest nodes on both sides of the fault point perform switching actions to remove the fault section after receiving the first remote control command.

[0210] Optionally, the device further comprises a capacitor coupler installed on both sides of the tie switch, and the two capacitor couplers are connected to the same communication unit; when the tie switch is closed, the carrier signal is directly transmitted through the switch; and when the tie switch is opened, the carrier signal is transmitted through the internal bridge of the two capacitor couplers.

[0211] Optionally, when the fault locating and isolating module adopts the area protection mode, when the medium-voltage power line carrier link is abnormal, the fault information is transmitted to the associated node terminal through the corresponding medium-voltage power line carrier module, the interaction information of each node terminal is formed, the node terminal transmits the interaction information to the distribution automation master station, the distribution automation master station locates the fault according to the interaction information, and the fault section is isolated.

[0212] Optionally, when the recovery module restores power supply of the non-fault section through closing of the tie switch, the recovery module comprises the following steps:

[0213] When the fault locating and isolating module adopts the signal relay mode, the distribution automation master station issues a second remote control command to the corresponding tie switch to control the corresponding tie switch to close to restore power supply of the non-fault section.

[0214] When the fault locating and isolating module adopts the area protection mode, the node in the smallest section isolated by the fault point transmits a fault section isolation success signal to the corresponding tie switch to control the corresponding tie switch to close to restore power supply of the non-fault section.

[0215] Embodiment 3 of the present application provides a medium-voltage power line carrier-based distribution network fault section locating system, which comprises a node, a node terminal, a medium-voltage power line carrier module arranged in the node terminal, and the medium-voltage power line carrier-based distribution network fault section locating device provided in Embodiment 2; the node terminal is used to monitor the running state of each corresponding node in real time, obtain monitoring information, and determine whether the node has a fault based on the monitoring information; when there is a fault, the medium-voltage power line carrier-based distribution network fault section locating device is used for fault locating and isolation.

[0216] As to the system in the above embodiments, the specific manner in which each unit performs operations has been described in detail in the embodiments related to the method, and will not be described in detail here.

[0217] Embodiment 4 of the present application provides an electronic device, which comprises a memory, a processor, and a computer program stored in the memory and capable of running on the processor; when the computer program is loaded into the processor, the medium-voltage power line carrier-based distribution network fault section locating method described in Embodiment 1 is implemented.

[0218] Embodiment 5 of the present application provides a computer readable storage medium storing a computer program, the computer program, when executed by a processor, implements the medium voltage power line carrier based power distribution network fault section location method according to embodiment 1.

[0219] It should be understood that the size of the serial number of each step in the above embodiments does not mean the order of execution, the execution order of each process should be determined according to its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of the present application.

[0220] The present disclosure can be a system, a method, and / or a computer program product. The computer program product can include a computer readable storage medium (or media) having computer readable program instructions thereon for causing a processor to carry out aspects of the present disclosure.

[0221] The computer readable storage medium can be a tangible device that can retain and store instructions for use by an instruction execution device. The computer readable storage medium can be, for example, but is not limited to, an electronic storage device, a magnetic storage device, an optical storage device, an electromagnetic storage device, a semiconductor storage device, or any suitable combination of the foregoing. More specific examples (a non-exhaustive list) of the computer readable storage medium include the following: a portable computer diskette, a hard disk, a random access memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), a static random access memory (SRAM), a portable compact disc read-only memory (CD-ROM), a digital versatile disk (DVD), a memory stick, a floppy disk, a mechanically encoded device such as punch-cards or punched tape, and any suitable combination of the foregoing. A computer readable storage medium, as used herein, is not to be construed as being transitory signals per se, such as radio waves or other freely propagating electromagnetic waves, electromagnetic waves propagating through a waveguide or other transmission media (e.g., light pulses passing through a fiber-optic cable), or electrical signals transmitted through a wire.

[0222] Computer readable program instructions described herein can be downloaded to respective computing / processing devices from a computer readable storage medium or to an external computer or external storage device via a network, for example, the Internet, a local area network, a wide area network and / or a wireless network. The network can comprise copper transmission cables, optical transmission fibers, wireless transmission, routers, firewalls, switches, gateway computers and / or edge servers. A network adapter card or network interface in each computing / processing device receives computer readable program instructions from the network and forwards the computer readable program instructions for storage in a computer readable storage medium within the respective computing / processing device.

[0223] Computer readable program instructions for carrying out operations of the present disclosure can be assembly instructions, instruction set architecture (ISA) instructions, machine instructions, machine dependent instructions, microcode, firmware instructions, state-setting data, or either source code or object code written in any combination of one or more programming languages, including an object oriented programming language such as Smalltalk, C++ or the like, and conventional procedural programming languages such as the "C" programming language or similar programming languages. The computer readable program instructions can execute entirely on the user's computer, partly on the user's computer, as a stand-alone software package, partly on the user's computer and partly on a remote computer or entirely on the remote computer or server. In the latter scenario, the remote computer can be connected to the user's computer through any type of network, including a local area network (LAN) or a wide area network (WAN), or the connection can be made to an external computer (for example, through the Internet using an Internet Service Provider). In some embodiments, electronic circuitry including, for example, programmable logic circuitry, field-programmable gate array (FPGA), or programmable logic array (PLA) can execute the computer readable program instructions by utilizing state information of the computer readable program instructions to personalize the electronic circuitry, in order to perform aspects of the present disclosure.

[0224] Finally, it should be noted that the above-mentioned embodiments are merely used to illustrate the technical solutions of the present application, but not to limit it. Although the present application has been described in detail with reference to the above-mentioned embodiments, those skilled in the art should understand that the specific embodiments of the present application can be modified or replaced, and any modification or replacement without departing from the spirit and scope of the present application should be covered in the protection scope of the claims of the present application.

Claims

1. A method for locating a fault section in a distribution network based on a medium voltage power line carrier, characterized in that: include: A corresponding medium-voltage power line carrier module is set at the node terminal, a corresponding identification code is configured for each node terminal of the line in the distribution network, and a communication link is established between each associated node of the distribution network according to the corresponding identification code; Each node terminal monitors the operating status of each corresponding node in real time and obtains monitoring information; Each node terminal determines whether a fault occurs in the node based on its own monitoring information; If a fault occurs, regional protection mode is used to locate and isolate the fault. Specifically, the fault information is transmitted to the associated node terminal via the corresponding medium-voltage power line carrier module in conjunction with the communication link, forming interactive information between each node terminal, locating the fault based on the interactive information, and isolating the fault section. After the fault section is successfully isolated, power supply to the non-fault section is restored by closing the tie switch; In regional protection mode, the fault information is transmitted to the associated node terminal via the corresponding medium voltage power line carrier module, including: According to the communication links of the associated nodes of the distribution network, the area surrounded by the action node and the terminal node, which no longer contains any action node, is regarded as the minimum isolation section; The fault information is transmitted to all node terminals within the minimum isolation section where the fault point is located through the corresponding medium voltage power line carrier module; Locate the fault based on the interaction information and isolate the faulty section, including: Each node terminal within the minimum isolation segment obtains the interaction information transmitted by the corresponding associated node; Determine the fault section where the fault point is located according to the event signal in the interactive information; When the fault point is located within the minimum isolation section, all nodes in the minimum isolation section where the fault point is located will perform tripping action, and all nodes in the minimum isolation section where the fault point is not located will be locked; The event signals in the interactive information include both internal and external faults. The fault section where the fault point is located is determined based on the event signals in the interactive information. Each node terminal analyzes the event signal in the interaction information; Traverse each minimum isolation segment. When there is only one internal fault and an external fault in the minimum isolation segment, the current minimum isolation segment is the fault segment where the fault point is located. If there are two internal faults or all are external faults in the minimum isolation segment, the current minimum isolation segment is the non-fault segment.

2. The method for locating a fault section in a distribution network based on a medium voltage power line carrier according to claim 1, characterized in that: The method further comprises: Depending on different scenarios, the signal relay mode or regional protection mode is selected for fault location and isolation. The signal relay mode includes: the node terminal transmits the fault information to the distribution automation master station, and the distribution automation master station locates the fault based on the fault information and isolates the fault section.

3. The method for locating a fault section in a distribution network based on a medium voltage power line carrier according to claim 1, characterized in that: The medium-voltage power line carrier module includes a communication unit and a capacitive coupler connected in sequence. The node terminal is connected to the communication unit and connected to the medium-voltage power line through the capacitive coupler. The communication unit transmits the monitoring information obtained by the node terminal to the capacitive coupler, which converts the monitoring information into a carrier signal and then couples it to the medium-voltage power line for transmission to the corresponding associated node terminal.

4. The method for locating a fault section in a distribution network based on a medium voltage power line carrier according to claim 1, characterized in that: In signal relay mode, the distribution automation master station locates the fault based on the fault information and isolates the faulty sections, including: Obtain distribution network topology information; Determine the fault section where the fault point is located based on the preset processing logic and fault information; Find the nearest nodes on both sides of the fault point in the distribution network topology information according to the fault section; The distribution automation master station sends the first remote control command to the nearest nodes on both sides of the fault; After receiving the first remote control command, the nearest nodes on both sides of the fault will switch to cut off the fault section.

5. The method for locating a fault section in a distribution network based on a medium voltage power line carrier according to claim 1, characterized in that: Capacitor couplers are installed on both sides of the tie switch, and the two capacitor couplers are connected to the same communication unit. When the tie switch is closed, the carrier signal is directly transmitted through the switch. When the tie switch is open, the carrier signal is transmitted through the internal bridge of the capacitor couplers on both sides.

6. The method for locating a fault section in a distribution network based on a medium voltage power line carrier according to claim 1, characterized in that: In regional protection mode, when the medium-voltage power line carrier link is abnormal, the fault information is transmitted to the associated node terminal through the corresponding medium-voltage power line carrier module, forming interactive information of each node terminal. The node terminal transmits the interactive information to the distribution automation master station. The distribution automation master station locates the fault according to the interactive information and isolates the fault section.

7. The method for locating a fault section in a distribution network based on a medium voltage power line carrier according to claim 1, characterized in that: Restoring power to the non-fault section by closing the tie switch includes: In signal relay mode, the distribution automation master station sends a second remote control command to the corresponding tie switch, controlling the corresponding tie switch to close and restore power supply to the non-fault section; In the regional protection mode, the node of the smallest isolated section where the fault point is located transmits a signal indicating that the fault section has been successfully isolated to the corresponding interconnecting switch, controlling the corresponding interconnecting switch to close and restore power supply to the non-faulty section.

8. A distribution network fault section location device based on medium voltage power line carrier, characterized in that: include: Establishing module, used to configure corresponding identification code for each node terminal of the line in the distribution network, and establish communication links between each associated node of the distribution network according to the corresponding identification code; The fault location and isolation module is used to locate and isolate the fault in the event of a fault using the regional protection mode. Specifically, the fault information is transmitted to the associated node terminal via the corresponding medium-voltage power line carrier module in conjunction with the communication link, forming interactive information between each node terminal, locating the fault based on the interactive information, and isolating the fault section. The recovery module is used to restore power supply to the non-fault section by closing the tie switch after the fault section is successfully isolated; The fault location and isolation module adopts the regional protection mode to perform fault location and isolation, and transmits the fault information to the associated node terminal via the corresponding medium voltage power line carrier module, including: According to the communication links of the associated nodes of the distribution network, the area surrounded by the action node and the terminal node, which no longer contains any action node, is regarded as the minimum isolation section; The fault information is transmitted to all node terminals within the minimum isolation section where the fault point is located through the corresponding medium voltage power line carrier module; Locating a fault based on interaction information and isolating the faulty section involves: Each node terminal within the minimum isolation segment obtains the interaction information transmitted by the corresponding associated node; Determine the fault section where the fault point is located according to the event signal in the interactive information; When the fault point is located within the minimum isolation section, all nodes in the minimum isolation section where the fault point is located will perform tripping action, and all nodes in the minimum isolation section where the fault point is not located will be locked; The event signals in the interactive information include both internal and external faults. Determining the fault section where the fault point is located based on the event signals in the interactive information includes: Each node terminal analyzes the event signal in the interaction information; Traverse each minimum isolation segment. When there is only one internal fault and an external fault in the minimum isolation segment, the current minimum isolation segment is the fault segment where the fault point is located. If there are two internal faults or all are external faults in the minimum isolation segment, the current minimum isolation segment is the non-fault segment.

9. The distribution network fault section location device based on medium voltage power line carrier according to claim 8, characterized in that: The fault location and isolation module selects the signal relay mode or the regional protection mode for fault location and isolation according to different scenarios. The signal relay mode includes: the node terminal transmits the fault information to the distribution automation master station, and the distribution automation master station locates the fault according to the fault information and isolates the fault section.

10. The distribution network fault section location device based on medium voltage power line carrier according to claim 8, characterized in that: The medium-voltage power line carrier module includes a communication unit and a capacitive coupler connected in sequence. The node terminal is connected to the communication unit and connected to the medium-voltage power line through the capacitive coupler. The communication unit transmits the monitoring information obtained by the node terminal to the capacitive coupler, which converts the monitoring information into a carrier signal and then couples it to the medium-voltage power line for transmission to the corresponding associated node terminal.

11. The distribution network fault section location device based on medium voltage power line carrier according to claim 8, characterized in that: When the fault location and isolation module adopts the signal relay mode, the distribution automation master station locates the fault according to the fault information and isolates the fault section, including: Obtain distribution network topology information; Determine the fault section where the fault point is located based on the preset processing logic and fault information; Find the nearest nodes on both sides of the fault point in the distribution network topology information according to the fault section; The distribution automation master station sends the first remote control command to the nearest nodes on both sides of the fault; After receiving the first remote control command, the nearest nodes on both sides of the fault will switch to cut off the fault section.

12. The device for locating a fault section in a distribution network based on a medium voltage power line carrier according to claim 8, characterized in that: The device also includes capacitive couplers installed on both sides of the connecting switch. The two capacitive couplers are connected to the same communication unit. When the connecting switch is closed, the carrier signal is directly transmitted through the switch. When the connecting switch is open, the carrier signal is transmitted through the internal bridge of the capacitive couplers on both sides.

13. The distribution network fault section location device based on medium voltage power line carrier according to claim 8, characterized in that: When the fault location and isolation module adopts the regional protection mode, when the medium-voltage power line carrier link is abnormal, the fault information is transmitted to the associated node terminal via the corresponding medium-voltage power line carrier module to form interactive information of each node terminal. The node terminal transmits the interactive information to the distribution automation master station. The distribution automation master station locates the fault according to the interactive information and isolates the fault section.

14. The device for locating a fault section in a distribution network based on a medium voltage power line carrier according to claim 8, characterized in that: When the restoration module restores power supply to the non-fault section by closing the tie switch, the restoration module includes: When the fault location and isolation module adopts the signal relay mode, the distribution automation master station sends a second remote control command to the corresponding tie switch to control the corresponding tie switch to close and restore power supply to the non-fault section; When the fault location and isolation module adopts the regional protection mode, the node of the smallest isolated section where the fault point is located transmits a fault section isolation success signal to the corresponding interconnection switch, controlling the corresponding interconnection switch to close and restore power supply to the non-fault section.

15. An electronic device comprising a processor and a storage medium; characterized in that: The storage medium is used to store instructions; The processor is configured to operate according to the instructions to execute the steps of the method according to any one of claims 1 to 7.

16. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the program is executed by a processor, the steps of the method according to any one of claims 1 to 7 are implemented.

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