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

Abstract

The invention discloses a power distribution network fault section positioning method and device based on medium-voltage power line carrier, electronic equipment and a storage medium, and the method comprises the steps: setting a corresponding medium-voltage power line carrier module at a node terminal, and building a communication link of each associated node of a power distribution network; each node terminal locally monitors the operation state of each corresponding node in real time, and judges whether the node has a fault or not based on self monitoring information; if a fault occurs, selecting a signal relay mode or a regional protection mode according to different scenes, carrying out fault positioning, and isolating a fault section; and after the fault section is successfully isolated, power supply of the non-fault section is recovered through connection switch closing. The method achieves the minimum positioning and isolation of the fault section of the power distribution network under the condition of communication limitation, and improves the operation reliability and stability of a power system.

Description

Technical Field

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

[0002] Fault section location is directly related to the power supply reliability of the distribution network, economic loss control, power equipment safety, smart grid development, and the improvement of power system management level. It reduces the duration and scope of power outages, avoids further equipment damage, and helps smart grids achieve self-healing control.

[0003] Currently, distribution automation terminals typically rely on optical fiber or wireless communication to communicate with the main distribution station. However, laying optical fiber is costly and difficult, especially in mountainous areas, which limits its widespread adoption. Furthermore, wireless communication signals are susceptible to interference. In areas with complex terrain, such as mountainous areas, signal quality is unstable and even interrupted by obstacles such as mountains. Furthermore, building and maintaining base stations is expensive. These issues lead to suboptimal distribution automation coverage and uptime, and insufficient monitoring and communication methods. Once a fault occurs, it is difficult to quickly locate it, and manual troubleshooting is inefficient, extending the duration and potentially expanding the scope of outages, impacting social production and life, and causing economic losses.

[0004] Prior Art Document 1 (CN101871988A) discloses a medium-voltage distribution network positioning system and method using power line carrier communication. The system includes several nodes, each with a number and fault information, 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 distribution network fault positioning and rapid isolation and recovery control method. Prior Art Document 3 (CN109347093A) discloses a distribution network self-healing control method that combines master station and local control. This method utilizes existing local power feed automation terminal information resources to achieve self-healing control that coordinates the distribution network master station with voltage-time-based power feed automation, enabling rapid fault location applicable to various 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: 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; 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 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. After the fault section is successfully isolated, power supply to the non-fault section is restored by closing the interconnecting switch.

[0010] 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.

[0011] 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.

[0012] 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: 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.

[0013] Optionally, 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 a tripping action, and all nodes in the minimum isolation section where the non-fault point is located will be locked.

[0014] 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: 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.

[0015] Optionally, in signal relay mode, the distribution automation master station locates the fault based on the fault information and isolates the faulty 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.

[0016] Optionally, capacitor couplers are installed on both sides of the interconnecting switch, and the two capacitor couplers are connected to the same communication unit. When the interconnecting switch is closed, the carrier signal is directly transmitted through the switch. When the interconnecting switch is opened, the carrier signal is transmitted through the internal bridge of the capacitor couplers on both sides.

[0017] Optionally, in 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.

[0018] Optionally, power supply to the non-fault section is restored by closing the tie breaker, including: 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.

[0019] A second aspect of the present invention provides a device for locating a fault section in a distribution network based on a medium voltage power line carrier, the device comprising: Establishing module for establishing communication links between various associated nodes of the distribution network; The fault location and isolation module is used to locate and isolate the fault in the regional protection mode in the event of a fault. Specifically, it includes: combining the communication link to transmit the fault information to the associated node terminal via the corresponding medium-voltage power line carrier module, forming interactive information of 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.

[0020] Optionally, the fault location and isolation module selects the signal relay mode or the area 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.

[0021] 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.

[0022] Optionally, the fault location and isolation module adopts a 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.

[0023] Optionally, the distribution automation master station locates the fault based on the interaction information and isolates the fault 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 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 interactive information includes an internal fault and an external fault. The distribution automation master station determines the fault section where the fault point is located according to the event signal in the interactive information, including: 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.

[0025] Optionally, 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.

[0026] Optionally, the device further includes capacitive couplers installed on both sides of the connecting switch, and 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 disconnected, the carrier signal is transmitted through the internal bridge of the capacitive couplers on both sides.

[0027] Optionally, 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.

[0028] Optionally, 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.

[0029] The third aspect of the present invention provides an electronic device, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein when the computer program is loaded into the processor, the method for locating a fault section of a distribution network based on a medium voltage power line carrier is implemented.

[0030] A fourth aspect of the present invention provides a computer-readable storage medium storing a computer program, which, when executed by a processor, implements the above-mentioned method for locating a fault section in a distribution network based on a medium-voltage power line carrier.

[0031] Compared with the prior art, the beneficial effects of the present invention include at least: 1) This invention integrates power line carrier (PLC) with fiber-optic / wireless communications to achieve a collaborative multi-communication mode. Using the carrier module as a "communication relay," this approach addresses the issues of insufficient fiber-optic / wireless coverage and low terminal online rates in remote areas. By prioritizing local regional protection, this invention isolates faults locally, improving the speed and reliability of local fault resolution. It is also applicable to short-circuit faults and single-phase grounding faults. When communication links at some nodes are abnormal, the system can switch to relay mode, providing redundancy. 2) This invention utilizes a dual-mode collaborative mechanism combining centralized control (i.e., signal relay mode) with local autonomy (i.e., regional protection mode) to enhance adaptability and compatibility across diverse scenarios. Furthermore, in either relay or regional protection mode, isolating a faulty section requires only a single tripping operation of the switch, without impacting power supply to upstream sections of the fault point. This improves system operational stability, switch lifespan, and rapid fault resolution.

[0032] 3) This invention establishes a minimum isolation zone for the faulty section by combining action nodes and terminal nodes, enabling rapid fault location and isolation, and improving the speed of fault resolution. Regardless of signal relay mode or regional protection mode, the faulty section is directly isolated by the nearest switches on both sides of the fault point. Unlike traditional fault isolation through substation outgoing line switches, this invention eliminates the need for coordination with substation outgoing line protection, reducing power restoration time. This improves the reliability and speed of fault resolution. In the event of local communication link anomalies or fault isolation failure, the master station can serve as a backup to minimize the isolation of the faulty section.

[0033] 4) The present invention configures capacitive couplers on both sides of the switch to achieve transmission through the switch when closed and transmission through bridging when open, solving the problem of signal interruption of traditional carrier when the switch is open.

[0034] 5) The present invention configures a unique identification code to enable each node to establish a communication link only with the associated node, reducing redundant connections. At the same time, a hardware encryption chip is used in the data transmission layer to improve communication efficiency and security.

[0035] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the scope of protection of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for describing the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. Those skilled in the art can also derive other drawings based on these drawings without inventive effort. Among them: Figure 1 This is a flow chart of a method for locating a fault section in a distribution network based on a medium voltage power line carrier according to a specific embodiment of the present invention; Figure 2 This is a schematic diagram of an application of a method for locating a fault section in a distribution network based on a medium voltage power line carrier according to a specific embodiment of the present invention; Figure 3 This is a schematic diagram of another application of a method for locating a fault section in a distribution network based on a medium voltage power line carrier according to a specific embodiment of the present invention. DETAILED DESCRIPTION

[0037] Exemplary embodiments of the present invention will now be described with reference to the accompanying drawings. However, the present invention may be embodied in many different forms and is not limited to the embodiments described herein. These embodiments are provided to provide a thorough and complete disclosure of the present invention and to fully convey the scope of the present invention to those skilled in the art. The terminology used in the exemplary embodiments shown in the accompanying drawings is not intended to limit the present invention. In the accompanying drawings, identical elements are denoted by the same reference numerals.

[0038] Unless otherwise specified, the terms used herein (including technical terms) have the meanings commonly understood by those skilled in the art. In addition, it is understood that terms defined in commonly used dictionaries should be understood to have the same meanings as those in the context of the relevant fields, and should not be understood as idealized or overly formal meanings.

[0039] like Figure 1 As shown, embodiment 1 of the present invention provides a method for locating a fault section of a distribution network based on a medium-voltage power line carrier, wherein each node of the distribution network is configured with a distribution automation feeder IoT terminal, and the method comprises the following steps: S1: 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. Configure corresponding identification codes for each node terminal in the distribution network line, and establish communication links for each node terminal based on the corresponding identification codes.

[0040] Optionally, the node terminal identification code includes the node identification code and the associated node identification code. The node terminal identification code is determined based on the line number of the node, the node location type, and the node device number. Node location types include segment, branch, and boundary. Segment-type nodes include substation outgoing line switches, section switches, and tie switches.

[0041] Specifically, the unique identification code configuration method is shown in Table 1: Table 1

[0042] In Table 1, Lxxx indicates the line number, L indicates the line, and the three-digit number indicates the line number; Tx indicates the current node location type, T indicates the type, 1 indicates a segment, 2 indicates a branch, and 3 indicates a boundary; Sxxx indicates the current node device number, S indicates the serial number, and the three-digit number indicates the device number.

[0043] By configuring the local node and its associated node identification codes, each node establishes communication links only with its associated node. This reduces redundant connections, reduces communication network congestion, reduces conflicts or packet loss caused by redundant connections, improves communication quality, and reduces communication overhead.

[0044] S2: Each node terminal monitors the operating status of each corresponding node in real time on site to obtain monitoring information.

[0045] The operating status includes power parameter information, device status information, and link quality information. Power parameter information includes node voltage, current, and power, device status information includes node switch status, and link quality information includes node communication status.

[0046] S3: Each node terminal determines whether a fault occurs at the node based on its own monitoring information; if a fault occurs, the signal relay mode and / or regional protection mode is selected according to different scenarios. In the regional protection mode, the fault information is transmitted to the associated node terminal via the corresponding medium-voltage power line carrier module in combination with the communication link to form interactive information of each node terminal, and the fault is located based on 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, and the distribution automation master station locates the fault based on the fault information and isolates the fault section.

[0047] 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.

[0048] In this embodiment, by converting monitoring information into a carrier signal and transmitting it over the power line, the fault section can be determined, improving the real-time and speed of fault diagnosis. Furthermore, fault isolation can be achieved even when communication with the master station is limited, improving the reliability and stability of power system operation.

[0049] The monitoring information also includes telemetry, shaking signals, remote control data and event signals. When there is a fault, the event signal in the monitoring information contains fault information, which includes but is not limited to overcurrent protection alarms, grounding protection alarms and other signals.

[0050] Each node terminal determines whether a fault has occurred in the node based on its own monitoring information, and actively transmits data to the associated node if a fault has occurred. Specifically, Each node terminal uses voltage and current electrical quantity information to identify short-circuit faults, ground faults, and other faults. Optical fiber / wireless communication coverage nodes or adjacent carrier nodes are used as associated nodes, actively transmitting data to the associated nodes when a fault occurs. Data transmission is performed in either signal relay mode or regional protection mode, depending on the scenario. In signal relay transmission mode, the node periodically transmits data to associated nodes, selecting a node terminal in the signal coverage area as the collection point. After local collection, data is sent to the distribution automation master station for decryption via an encryption chip. When a fault is detected, the fault information is immediately transmitted. In regional protection transmission mode, the node's data is encrypted and transmitted to all nodes within the minimum isolation segment.

[0051] Optionally, the fault isolation mode includes a signal relay mode and a regional protection mode. The data transmission format is set according to different fault isolation modes, including: 1) When using the signal relay mode, the data transmission format between the node and the distribution automation master station is as shown in Table 2: Table 2

[0052] In the signal relay mode, this node periodically transmits data to the associated nodes, which are collected locally and then sent to the distribution automation master station for decryption via the encryption chip.

[0053] 2) When using the regional protection mode, the data transmission format between nodes is as shown in Table 3: Table 3

[0054] In the regional protection transmission mode, the data of this node is transmitted to all nodes in the minimum isolation segment using an encryption algorithm, such as SM2 / SM4 and other national encryption algorithms.

[0055] Optionally, in S3, in the 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.

[0056] It can be understood that the minimum isolation section where the fault point is located is the terminal of the switch directly connected to the fault point, the encircled area.

[0057] It can be understood that the action node is a node that has the conditions for controlling the switch to isolate the fault. The fault point is generally a line short circuit or other fault that affects equipment and personal safety.

[0058] Furthermore, in S3, the fault is located based on the interaction information and the faulty section is isolated, 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, the nodes within the minimum isolation section where the fault point is located will trip, locking all nodes in the minimum isolation section where the fault point is not located.

[0059] Furthermore, determining the fault section where the fault point is located according to the event signal in the interaction information includes: The terminals exchange fault information, including intra-area faults and extra-area faults, and transmit the information to adjacent node terminals. Each node terminal parses the exchange information. When there is only one intra-area fault and an extra-area fault within the minimum isolation section, the current section is the fault section and the fault point is located within the fault section. When there are two intra-area faults or all are extra-area faults, the current section is the non-fault section.

[0060] In-zone faults and out-of-zone faults are determined locally by the node terminal based on the location 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-of-zone fault.

[0061] In this embodiment, when the fault point is within the minimum isolation section, the circuit breaker trips to isolate the fault point. Since the upstream power source remains connected, power outage prevention occurs, minimizing the scope of the outage. The downstream switch trips to facilitate subsequent power supply restoration, accelerating the restoration of power to the loads downstream of the fault point. When the fault point is not within the minimum isolation section, all nodes in the minimum isolation section other than the fault point are locked. This prevents malfunctions from expanding the isolation section or the power outage scope, minimizing the impact on subsequent power supply restoration.

[0062] Optionally, in signal relay mode, the distribution automation master station locates the fault based on the fault information and isolates the faulty 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.

[0063] Specifically, the fault section where the fault point is located is determined based on the preset processing logic and fault information, including: The switch states of the distribution network are converted into a matrix model, and a logic equation is constructed based on the switch combinations through which the fault current flows. The switch combinations include "0" and "1" states, where "1" represents overcurrent and "0" represents no overcurrent. When the section fault judgment vector is greater than 0, it is a fault section; otherwise, it is a non-fault section. This method is mainly applicable to simple radial networks.

[0064] It is understandable that many existing technical solutions can be used to determine the fault section where the fault point is located based on the preset processing logic and fault information, and this embodiment does not limit this.

[0065] In this embodiment, during the fault section isolation process, whether in signal relay mode or regional protection mode, only a single switch opening operation is required, which does not affect power supply to the upstream section of the fault point. This improves system operational stability, switch operating life, and rapid fault resolution. Furthermore, regardless of signal relay mode or regional protection mode, the faulty section is directly isolated by the nearest switches on both sides of the fault point. Unlike traditional methods of isolating the fault through substation outgoing line switches, this invention eliminates the need for coordination with substation outgoing line protection, reduces power restoration time, and thus improves the reliability and rapidity of fault resolution.

[0066] In this embodiment, by setting a minimum isolation area, finding the fault point within the minimum isolation area and performing corresponding operations, the power outage range is reduced, the power supply to the loads in the non-fault section can be restored to the maximum extent, and the power supply reliability is improved.

[0067] Furthermore, in 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.

[0068] It is understood that the health of the medium-voltage power line carrier link can be determined by heartbeat messages between terminals. If the heartbeat messages meet preset requirements, the medium-voltage power line carrier channel's real-time performance and rate meet preset requirements, and the medium-voltage power line carrier link is considered normal; otherwise, it is abnormal. It is understood that when the medium-voltage power line carrier link is abnormal, its real-time performance is weakened or interrupted. In this case, only the fault information can be transmitted to the adjacent terminal, and the distribution network automation master station can be coordinated to isolate the fault.

[0069] In this way, when the medium-voltage carrier link signal is abnormal, the distribution automation master station isolates the fault based on the event signal sent by each node, and uses the distribution network automation as a backup to minimize the isolation of the fault section. The master station collects the fault event signal sent by the terminal to the master station, and analyzes it through the fault location algorithm combined with the power grid topology structure, which is equivalent to the signal relay mode. Through the dual-mode collaboration mechanism, the reliability and speed of fault handling are improved.

[0070] Furthermore, capacitor couplers are installed on both sides of the interconnecting switch, and the two capacitor couplers are connected to the same communication unit. When the interconnecting switch is closed, the carrier signal is directly transmitted through the switch. When the interconnecting switch is opened, the carrier signal is transmitted through the internal bridge of the capacitor couplers on both sides.

[0071] In this way, by configuring capacitive couplers on both sides of the switch, transmission is achieved through the switch when closed and through bridging when open, solving the problem of signal interruption of traditional carrier when the switch is open, and further improving the speed of fault location.

[0072] In some embodiments, the local area protection mode will be used preferentially to achieve local isolation of faults. Since the power line carrier has high real-time performance and fast transmission speed under normal circumstances, it can improve the speed and reliability of local fault handling. It is also suitable for short-circuit faults and single-phase grounding faults. When the communication link of some nodes is abnormal, it can be switched to relay mode with redundancy.

[0073] Furthermore, if the minimum isolation areas where the fault points are located are determined to be different by each node terminal, the minimum isolation sections are merged upward or downward into one minimum isolation section for judgment.

[0074] In this way, fault isolation and power restoration can be completed first, and the master station can then perform further refined isolation based on the uploaded event information combined with the topology and system operating status.

[0075] S4: After the fault section is successfully isolated, power supply to the non-fault section is restored by closing the interconnecting switch.

[0076] In S4, power supply to the non-fault section is restored by closing the tie switch, including: 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 locally and restore power supply to the non-faulty section.

[0077] The following describes the application of the method provided in Example 1 in different scenarios.

[0078] like Figure 2 As shown, a specific embodiment of the present invention provides an application schematic diagram of a method for locating a fault section in a distribution network based on a medium voltage power line carrier.

[0079] Figure 2 In the example, the substation outgoing line switches CB1 and CB2, the section switches FS1 and FS2, and the tie switch LSW establish a vertical communication link with the distribution automation master station through optical fiber / wireless communication. The section switch FS3 is located in an area without communication coverage. At this time, the nearest associated node covered by optical fiber or wireless communication is FS2. Therefore, the nodes in the area without communication coverage and the nearest associated nodes are all equipped with medium-voltage carrier communication modules to build a horizontal communication link. The carrier equipment includes a capacitive coupler and a communication unit, each of which is configured with a unique identification code as follows: The segment switch FS2 is shown in Table 4: Table 4

[0080] The segment switch FS3 is shown in Table 5: Table 5

[0081] The terminal at FS3 is directly connected to the communication unit, periodically transmitting data to the capacitive coupler, which is then converted into a carrier signal and coupled to the medium-voltage power line for transmission to the associated node FS2. After being collected locally, it is sent to the distribution automation master station for decryption via the encryption chip.

[0082] For example, a main line fault between section switches FS2 and FS3 occurs. Both FS2 and FS3 detect the fault locally and switch from periodic transmission mode to active transmission mode. FS3, located downstream of the fault, does not experience an overcurrent event signal. CB1, FS1, and FS2, located upstream of the fault, all generate overcurrent protection alarms. CB1 and FS1 directly transmit event signals to the distribution automation master station. FS2, upon receiving data transmitted by FS3, aggregates and transmits them to the master station.

[0083] Based on the network topology, the distribution automation master station locates the fault point between the section switches FS2 and FS3 through the overcurrent protection alarm signal, and sends remote control commands to FS2 and FS3. Among them, the remote control command of FS3 is received by FS2, converted into a carrier signal, and then coupled to the power line for transmission. After receiving the carrier signal, FS3 parses and decrypts it and executes it, finally completing the isolation of the fault section.

[0084] The distribution automation master station monitors the system operating status in real time. After confirming that the fault is isolated successfully, it sends an encrypted remote control command to the interconnection switch LSW, and after closing the switch, the power supply to the non-fault section is restored.

[0085] In this embodiment, when communication is limited and the carrier module deployment is insufficient, the node terminal in the non-communication area exchanges information with the node terminal in the optical fiber or wireless communication coverage area through the carrier module, and cooperates with the distribution automation master station to locate and isolate the fault, thereby improving the reliability and stability of the power system operation.

[0086] like Figure 3 FIG. 1 is a schematic diagram showing another application of a method for locating a fault section in a distribution network based on a medium voltage power line carrier according to a specific embodiment of the present invention.

[0087] Figure 3 In the substation, outgoing line switches CB1 and CB2, section switches FS1, FS2 and FS3, and tie switch LSW establish a longitudinal communication link with the distribution automation master station through optical fiber / wireless communication.

[0088] Based on the principle that the minimum isolation section is defined as the area enclosed by the active and terminal nodes, which no longer contains active nodes, horizontal communication links based on the power line medium-voltage carrier are established between the outgoing switch CB1 and the sectionalizer FS1; between the sectionalizers FS1 and FS2 and the branch switches FZS1 and FZS2; between the sectionalizers FS2 and FS3 and the branch switch FZS3; and between the sectionalizer FS3 and the LSW. These switches are all equipped with medium-voltage carrier communication equipment, including capacitive couplers and communication units. Furthermore, capacitive couplers are installed on both sides of the tie switch LSW, connected to the same communication unit. When closed, transmission occurs directly through the switch; when open, transmission occurs through an internal bridge between the capacitive couplers on both sides.

[0089] The above switches are configured with unique identification codes, as follows: The outgoing line switch CB1 of the substation is shown in Table 6: Table 6

[0090] The segment switch FS1 is shown in Table 7: Table 7

[0091] The segment switch FS2 is shown in Table 8: Table 8

[0092] The segment switch FS3 is shown in Table 9: Table 9

[0093] The section switch FZS1 is shown in Table 10: Table 10

[0094] The section switch FZS2 is shown in Table 11: Table 11

[0095] The section switch FZS3 is shown in Table 12: Table 12

[0096] The tie switch LSW is shown in Table 13: Table 13

[0097] Taking the main line fault between section switches FS2 and FS3 as an example, both FS2 and FS3 detect the fault locally. 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 trigger overcurrent protection alarms. Terminals within each protection zone exchange information horizontally via the power lines and simultaneously send event signals to the distribution automation master station.

[0098] Based on the principle that the fault point is located within the protection area only when there is a terminal overcurrent protection alarm, the fault point is determined to be between the section switches FS2 and FS3. FS2 and FS3 are tripped to complete the isolation of the fault section.

[0099] The section switch FS2 transmits the "isolation success" signal to FS3, and then transmits it to the contact LSW through FS3. LSW closes the circuit breaker after checking for no voltage and restores the non-fault power supply. Closing the circuit breaker when there is voltage on one side is not allowed through checking for no voltage, to avoid asynchronous closing and affecting the stability of system operation.

[0100] At the same time, considering the situation where the fault section cannot be located and isolated on site due to abnormal power line carrier channel, the distribution automation master station locates the fault section based on the overcurrent protection alarm signal based on the network topology, and sends remote control commands to the corresponding switches FS2 and FS3 to complete fault isolation. After confirming that the fault isolation is successful, it sends an encrypted remote control command to the tie switch LSW, and after closing the switch, power supply to the non-fault section is restored.

[0101] In this embodiment, when the carrier module provides full coverage, adjacent node terminals exchange information via the carrier module to locally locate and isolate the faulty section. Furthermore, by installing capacitive couplers on both sides of the tie switch, reliable signal transmission is ensured even when the switch is disconnected. This invention minimizes the location and isolation of faulty sections in the distribution network under communication-restricted conditions, improving the reliability and stability of power system operation.

[0102] Embodiment 2 of the present invention provides a distribution network fault section location device based on medium voltage power line carrier, which runs the distribution network fault section location method based on medium voltage power line carrier as described in embodiment 1, and the device includes Establishing module for establishing communication links between various associated nodes of the distribution network; The fault location and isolation module is used to select the signal relay mode or regional protection mode according to different scenarios in the event of a fault. In the regional protection mode, the fault information is transmitted 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, and the fault is located based on 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, and the distribution automation master station locates the fault based on the fault information and isolates 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.

[0103] Optionally, the fault location and isolation module selects the signal relay mode or the area 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.

[0104] 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.

[0105] Optionally, the fault location and isolation module adopts a 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.

[0106] Optionally, the distribution automation master station locates the fault based on the interaction information and isolates the fault 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 a tripping action, and all nodes in the minimum isolation section where the non-fault point is located will be locked.

[0107] Optionally, the event signal in the interactive information includes an internal fault and an external fault. The distribution automation master station determines the fault section where the fault point is located according to the event signal in the interactive information, including: 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.

[0108] Optionally, 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.

[0109] Optionally, the device further includes capacitive couplers installed on both sides of the connecting switch, and 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 disconnected, the carrier signal is transmitted through the internal bridge of the capacitive couplers on both sides.

[0110] Optionally, 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.

[0111] Optionally, 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.

[0112] Embodiment 3 of the present invention provides a distribution network fault area locating system based on a medium-voltage power line carrier, the system including a node, a node terminal, a medium-voltage power line carrier module arranged at the node terminal, and a distribution network fault section locating device of the medium-voltage power line carrier provided in Embodiment 2. The node terminal is used to monitor the operating status of each corresponding node in real time, obtain monitoring information, and determine whether a fault occurs at the node based on its own monitoring information; when a fault occurs, the distribution network fault section locating device of the medium-voltage power line carrier is used to locate and isolate the fault.

[0113] Regarding the system in the above embodiment, the specific manner in which each unit performs operations has been described in detail in the embodiment of the method, and will not be elaborated here.

[0114] Embodiment 4 of the present invention provides an electronic device, including a memory, a processor, and a computer program stored in the memory and executable on the processor. When the computer program is loaded into the processor, the method for locating a fault section of a distribution network based on a medium-voltage power line carrier as described in embodiment 1 is implemented.

[0115] Embodiment 5 of the present invention provides a computer-readable storage medium storing a computer program. When the computer program is executed by a processor, the method for locating a fault section in a distribution network based on a medium-voltage power line carrier according to embodiment 1 is implemented.

[0116] It should be understood that the size of the serial numbers of the steps in the above embodiments does not mean the order of execution. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of the present invention.

[0117] The present disclosure may be a system, method and / or computer program product. The computer program product may include a computer-readable storage medium carrying computer-readable program instructions for causing a processor to implement various aspects of the present disclosure.

[0118] A computer-readable storage medium can be a tangible device that can hold and store instructions for use by an instruction execution device. A computer-readable storage medium can be, for example, but not limited to, an electrical storage device, a magnetic storage device, an optical storage device, an electromagnetic storage device, a semiconductor storage device, or any suitable combination thereof. More specific examples (a non-exhaustive list) of computer-readable storage media include: a portable computer disk, a hard disk, random access memory (RAM), read-only memory (ROM), erasable programmable read-only memory (EPROM or flash memory), 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 mechanical encoding device, such as a punched card or raised structure in a groove on which instructions are stored, and any suitable combination thereof. As used herein, a computer-readable storage medium is not to be construed as a transient signal per se, such as a radio wave or other freely propagating electromagnetic wave, an electromagnetic wave propagating through a waveguide or other transmission medium (e.g., a light pulse passing through a fiber optic cable), or an electrical signal transmitted through an electrical wire.

[0119] The computer-readable program instructions described herein can be downloaded from a computer-readable storage medium to each computing / processing device, or downloaded to an external computer or external storage device via a network, such as the Internet, a local area network, a wide area network, and / or a wireless network. The network can include copper transmission cables, fiber optic transmission, wireless transmission, routers, firewalls, switches, gateway computers, and / or edge servers. The network adapter card or network interface in each computing / processing device receives the computer-readable program instructions from the network and forwards the computer-readable program instructions to be stored in the computer-readable storage medium in each computing / processing device.

[0120] The computer program instructions for performing the operations of the present disclosure may be assembly instructions, instruction set architecture (ISA) instructions, machine instructions, machine-dependent instructions, microcode, firmware instructions, state setting data, or source code or object code written in any combination of one or more programming languages, including object-oriented programming languages such as Smalltalk, C++, and conventional procedural programming languages such as "C" or similar programming languages. The computer-readable program instructions may be executed entirely on the user's computer, partially on the user's computer, as a stand-alone software package, partially on the user's computer and partially on a remote computer, or entirely on a remote computer or server. In the case of a remote computer, the remote computer may be connected to the user's computer via any type of network, including a local area network (LAN) or a wide area network (WAN), or may be connected to an external computer (e.g., via the Internet using an Internet service provider). In some embodiments, the state information of the computer-readable program instructions is used to personalize an electronic circuit, such as a programmable logic circuit, a field programmable gate array (FPGA), or a programmable logic array (PLA), so that the electronic circuit can execute the computer-readable program instructions, thereby implementing various aspects of the present disclosure.

[0121] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the above embodiments, ordinary technicians in the field should understand that the specific implementation methods of the present invention can still be modified or replaced by equivalents. Any modification or equivalent replacement that does not depart from the spirit and scope of the present invention should be covered by the scope of protection of the claims of the present invention.

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: 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; 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 interconnecting switch.

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 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.

5. The method for locating a fault section in a distribution network based on a medium voltage power line carrier according to claim 4, characterized in that: 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 a tripping action, and all nodes in the minimum isolation section where the non-fault point is located will be locked.

6. The method for locating a fault section in a distribution network based on a medium voltage power line carrier according to claim 5, characterized in that: 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.

7. The method for locating a fault section in a distribution network based on a medium voltage power line carrier according to claim 2, 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.

8. 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.

9. 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.

10. The method for locating a fault section in a distribution network based on a medium voltage power line carrier according to claim 2, 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.

11. A distribution network fault section location device based on medium voltage power line carrier, characterized in that: include: Establishing module for establishing communication links between various associated nodes of the distribution network; 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.

12. The distribution network fault section location device based on medium voltage power line carrier according to claim 11, 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.

13. The device for locating a fault section in a distribution network based on a medium voltage power line carrier according to claim 11, 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.

14. The device for locating a fault section in a distribution network based on a medium voltage power line carrier according to claim 11, characterized in that: 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.

15. The device for locating a fault section in a distribution network based on a medium voltage power line carrier according to claim 14, characterized in that: The distribution automation master station locates the fault based on the interactive information and isolates the fault 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 a tripping action, and all nodes in the minimum isolation section where the non-fault point is located will be locked.

16. The distribution network fault section location device based on medium voltage power line carrier according to claim 15, characterized in that: The event signal in the interactive information includes an internal fault and an external fault. When the distribution automation master station determines the fault section where the fault point is located according to the event signal in the interactive information, it 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.

17. The device for locating a fault section in a distribution network based on a medium voltage power line carrier according to claim 12, 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.

18. The device for locating a fault section in a distribution network based on a medium voltage power line carrier according to claim 11, 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.

19. The device for locating a fault section in a distribution network based on a medium voltage power line carrier according to claim 11, 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.

20. The distribution network fault section location device based on medium voltage power line carrier according to claim 12, 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.

21. 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 10.

22. 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 10 are implemented.

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