An edge-computing-based pole-mounted switch on-site fault self-healing ring power distribution method

Abstract

The present application relates to the technical field of power system automation, and discloses a pole-mounted switch on-site fault self-healing ring network power distribution method based on edge computing, comprising the following steps: step S01: obtaining monitoring area ring network communication data for communication state monitoring, step S02: ring network waveform symmetry sensing and on-site fault identification, step S03: fault point positioning based on traveling wave wave head detection, step S04: combining communication state and fault location to perform pole-mounted switch on-site self-healing control, and step S05: performing fault automatic checking switch action state and power supply state, through the above steps, the two operation scenes of normal ring network communication and communication failure are accurately distinguished, the exclusive self-healing control strategy is matched, and in the communication failure scene, the fault processing can still be completed relying on the local edge computing node, the self-healing function failure caused by communication interruption is avoided, and the adaptability and stability of the ring network power distribution fault self-healing are further improved.

Description

Technical Field

[0001] This invention relates to the field of power system automation technology, and more specifically to a method for self-healing local faults in pole-mounted switches in ring network power distribution based on edge computing. Background Technology

[0002] With the iterative upgrades of smart grid technology and the gradual popularization of distribution network automation technology, feeder automation (FA) has become the core technology for distribution network fault self-healing, realizing the transformation of distribution network fault handling from manual to automated handling. From the initial pure master station centralized self-healing architecture to the mid-term distributed collaborative self-healing scheme, and then to conventional local self-healing technology, the automation level of distribution network fault location, isolation, and power restoration has been continuously improved, significantly shortening the power outage time. At present, pole-mounted switches have been fully equipped with measurement and control terminals, relying on power communication networks to realize data interaction and collaborative control, becoming the core execution equipment for fault self-healing in ring network distribution systems, and are widely used in urban and rural medium-voltage ring network distribution scenarios.

[0003] Currently, the fault self-healing system of medium-voltage ring network power distribution system in China is mainly divided into three categories: centralized, intelligent distributed, and conventional local. Among them, the centralized self-healing technology relies on the power distribution master station to collect the operation data and fault information of the entire network switches. After unified calculation and analysis by the master station, control commands are issued to complete fault isolation and power supply reconstruction. It has the advantage of global scheduling and is suitable for standardized distribution network scenarios with full communication coverage in urban areas.

[0004] Although existing distribution network fault self-healing technologies have achieved automated implementation, they still have technical shortcomings in complex ring network operation scenarios, communication fluctuation conditions, and accurate fault identification: They lack differentiation between self-healing logic for normal and communication failure conditions, resulting in poor adaptability. Existing self-healing solutions all use a single, fixed control logic, failing to design differentiated self-healing strategies for the two core operating conditions of normal and interrupted ring network communication. They lack the ability to perceive symmetrical ring network waveforms and perform local, refined fault identification, leading to low fault judgment accuracy. Existing pole-mounted switch self-healing technologies rely solely on steady-state thresholds such as overcurrent, overvoltage, and undervoltage for fault identification, without incorporating voltage and current waveform symmetrical feature sensing technology. This makes it impossible to accurately distinguish between permanent and transient faults, often resulting in unnecessary line outages and self-healing malfunctions. Furthermore, they are highly dependent on communication networks, lack robustness in self-healing operation, and reduce the stability of distribution network power supply. Summary of the Invention

[0005] In order to overcome the above-mentioned defects of the prior art, the present invention provides a method for self-healing local faults of pole-mounted switches in ring network power distribution based on edge computing, so as to solve the problems existing in the background art.

[0006] This invention provides the following technical solution: a method for self-healing local faults in pole-mounted switches in ring network power distribution based on edge computing, comprising the following steps: Step S01: Acquire ring network communication data in the monitoring area for communication status monitoring: Real-time acquisition of dynamic ring network communication data in the monitoring area through the built-in edge computing FTU, and judgment of communication status; Step S02: Ring network waveform symmetry sensing and local fault identification: Synchronously collect the three-phase voltage of the ring network in the monitoring area, obtain the ring network voltage waveform diagram, and perform local fault identification of the ring network in the monitoring area based on the ring network voltage waveform diagram; Step S03: Fault location based on traveling wave front detection: Based on the local fault identification results of the ring network, the location of the fault point is determined when a ring network fault occurs; Step S04: Execute local self-healing control of pole-mounted switch based on communication status and fault location: Based on the communication status obtained in step S01, distinguish between normal self-healing logic of ring network communication and failure self-healing logic of ring network communication, and output the corresponding pole-mounted switch opening and closing control command based on the fault location result. Step S05: Perform automatic fault verification of switch operation status and power supply status: Execute control commands to isolate the faulty section and automatically verify the switch operation status and power supply status.

[0007] Preferably, in step S01, the specific content of acquiring the dynamic ring network communication data of the pole-mounted switch for communication status monitoring is as follows: By continuously sampling the physical layer signal of the ring network communication link through the built-in edge computing FTU, the ring network communication link acquires real-time optical power sampling frames and generates a time-continuous optical power sampling frame sequence. A fixed sliding statistical window of 200ms is set up to check the continuity of the sampling frames in the optical power sampling frame sequence. If there are no gaps in the timing of the sampling frames within the sliding window, the check result is that the sampling frames are continuous; otherwise, if there are gaps in the timing of the sampling frames within the sliding window, the check result is that the sampling frames are discontinuous. When the verification result is that the sampling frames are continuous, the average optical power of all sampling frames within the sliding window is calculated and compared with the preset received optical power threshold range. If the average optical power does not meet the threshold range, the ring network communication status is determined to be invalid; otherwise, the ring network communication status is determined to be normal. When the verification result is that the sampling frames are discontinuous, the ring network communication status is directly determined to be invalid.

[0008] Preferably, in step S02, the specific content of ring network waveform symmetry sensing and local fault identification is as follows: The three-phase voltage of the ring network in the monitoring area is synchronously collected by the voltage sampling transformer to obtain the three-phase voltage waveforms of A, B, and C over a continuous time period. If the voltage waveforms of phases A, B, and C are all standard sine waves and the amplitudes of the three phases are equal, the identification result is that the ring network is normal; otherwise, the identification result is that the ring network is faulty.

[0009] Preferably, in step S03, the specific content of fault point localization based on traveling wave front detection is as follows: Based on the local fault identification results of the ring network waveform symmetry sensing in step S02, when the identification result is a ring network obstacle, the upstream and downstream of the faulty section of the pole-mounted switch is accurately located. The specific location logic is as follows: Transient current traveling wave signals are acquired by high-frequency current sensors in the built-in edge computing FTU. When a ring network obstacle is identified, the waveform is frozen and buffered as a traveling wave waveform sequence, and then the fault analysis process is initiated. Traveling wave front detection and extraction of candidate wave front times: Wavelet transform modulus maxima method is used to identify waveform singularities and determine the singularities as candidate traveling wave fronts. The arrival time, wave front polarity and amplitude of each candidate wave front are recorded. Arrange them in chronological order of arrival to obtain the wavefront sequence. The first wavefront in the wavefront sequence to exceed the amplitude threshold is identified as the initial positive traveling wave, and a wavefront is selected that is consistent with... The first subsequent wavefront with the same wavefront polarity is used as the reflected wave at the fault point. ; based on Arrival time at the measuring end and Returning to the measurement end, a round-trip time difference analysis is performed, wherein the round-trip time difference is... Return measurement time and The difference in arrival times at the measurement end; The fault distance is calculated based on the pre-defined traveling wave propagation speed and the round-trip propagation time difference; The device moves along the direction of the traveling wave, and the displacement is the fault distance, thus completing the fault location determination.

[0010] Preferably, in step S04, the specific content of executing the local self-healing control of the pole-mounted switch in combination with the communication status and fault location is as follows: Based on the communication status obtained in step S01, distinguish between the normal self-healing logic and the failure self-healing logic of the ring network communication: when the ring network communication status is normal, execute the normal self-healing logic of the ring network communication; when the ring network communication status fails, execute the failure self-healing logic of the ring network communication. Based on the fault location results, output the corresponding pole-mounted switch opening and closing control commands: output pole-mounted switch opening and closing control commands based on the normal self-healing logic of ring network communication; output pole-mounted switch opening and closing control commands based on the failure self-healing logic of ring network communication.

[0011] Preferably, the specific content of the pole-mounted switch opening and closing control command output based on the normal self-healing logic of ring network communication is as follows: When the ring network communication is normal, the fault point is isolated through the communication network. The fault location result is synchronized to the built-in edge computing FTU in the ring network. Each pole-mounted switch outputs a trip command to the pole-mounted switches on both sides of the fault point according to the received fault section information, thus completing the isolation of the fault section. It also outputs a closing command to the pole-mounted switches in the non-fault section, thus restoring the power supply connection of the non-fault section.

[0012] Preferably, the specific content of the output pole-mounted switch opening and closing control command based on the ring network communication failure self-healing logic is as follows: The ring network line is installed with pole-mounted switches a, b, c, d, ..., n in sequence from the power supply side to the load side. Among them, pole-mounted switch a is the first switch closest to the power supply side. The fault section is determined based on the location of the fault point. When the fault point is located between b and c, the fault section is segment bc. a and b are upstream of the fault point, and c, d, ..., n are downstream of the fault point. When a fault occurs, the pole-mounted switch automatically disconnects, and the circuit is tested step by step starting from the power supply side: Switch A: Upon detecting incoming power, start the X-time limit timer. If the voltage stabilizes within 7 seconds, output the A closing command. Switch b: When switch a closes, switch b detects the incoming power, starts the X time limit timer, and outputs a switch b closing command within 7 seconds after the voltage stabilizes. After switch b closes, power is supplied to the fault section. At this time, switch b is within the Y time limit after closing. When the closing voltage loss is detected, switch b opens and outputs a command to open. Switch C outputs a trip command based on the closing command of switch B; A closing command is sent to the switch downstream of the fault point to restore power supply.

[0013] Preferably, in step S05, the specific content of performing automatic fault verification of the switch operation status and power supply status is as follows: Receives and executes control commands for opening and closing pole-mounted switches based on the normal self-healing logic of ring network communication and the failure self-healing logic of ring network communication. The fault section is isolated based on the tripping command; After the switch is opened or closed, the system terminal collects the switch position status and line energization status in real time and transmits them back to the distribution master station in real time; the distribution master station verifies the switch operation status and line power supply status one by one.

[0014] The technical effects and advantages of this invention are as follows: This invention precisely distinguishes between two operating scenarios: normal ring network communication and communication failure, and matches them with a dedicated self-healing control strategy. When communication is normal, it relies on network-wide data collaboration to achieve precise fault isolation and power supply reconfiguration, ensuring self-healing accuracy. Under abnormal conditions such as communication interruption, packet loss, and delay, it automatically switches to local step-by-step self-healing logic when there is no communication. Through step-by-step closing verification of power supply side switches and precise blocking of fault sections, it achieves autonomous fault handling in the network outage state. This solves the problem of the self-healing function being paralyzed when communication is abnormal in traditional technologies, which can only rely on manual repairs. It greatly improves the environmental adaptability and operational stability of the ring network power distribution self-healing system. By synchronously acquiring the three-phase voltage waveform of the ring network through the current transformer, the local fault is accurately identified based on the symmetry and amplitude consistency of the three-phase waveform. This avoids the problems of missed fault detection, misjudgment, and judgment lag that are easy to occur in traditional technologies, effectively avoids unnecessary line outages and switch malfunctions, and greatly improves the precision of distribution network fault identification and power supply stability. After completing the fault isolation and power restoration self-healing actions, the switch opening and closing status and the line energization status can be collected in real time and transmitted back to the distribution master station. The master station completes dual verification of the action status and power supply status, forming a closed-loop control system of local self-healing execution + cloud verification and supervision. It can promptly detect abnormal self-healing actions, ensure the integrity and accuracy of fault self-healing, and comprehensively improve the power supply reliability and intelligent operation and maintenance level of the medium-voltage ring network distribution system. Attached Figure Description

[0015] Figure 1 This is a flowchart illustrating a self-healing ring network power distribution method for local faults of pole-mounted switches based on edge computing. Detailed Implementation

[0016] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings. In addition, the forms of the various structures described in the following embodiments are merely illustrative. The self-healing ring network power distribution method for pole-mounted switches based on edge computing involved in the present invention is not limited to the structures described in the following embodiments. All other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0017] like Figure 1 As shown, this invention provides a method for self-healing local faults in pole-mounted switches in ring network power distribution based on edge computing, comprising the following steps: Step S01: Acquire ring network communication data in the monitoring area for communication status monitoring: Real-time acquisition of dynamic ring network communication data in the monitoring area through the built-in edge computing FTU, and judgment of communication status; Step S02: Ring network waveform symmetry sensing and local fault identification: Synchronously collect the three-phase voltage of the ring network in the monitoring area, obtain the ring network voltage waveform diagram, and perform local fault identification of the ring network in the monitoring area based on the ring network voltage waveform diagram; Step S03: Fault location based on traveling wave front detection: Based on the local fault identification results of the ring network, the location of the fault point is determined when a ring network fault occurs; Step S04: Execute local self-healing control of pole-mounted switch based on communication status and fault location: Based on the communication status obtained in step S01, distinguish between normal self-healing logic of ring network communication and failure self-healing logic of ring network communication, and output the corresponding pole-mounted switch opening and closing control command based on the fault location result. Step S05: Perform automatic fault verification of switch operation status and power supply status: Execute control commands to isolate the faulty section and automatically verify the switch operation status and power supply status.

[0018] In this embodiment, it should be specifically explained that the specific content of obtaining the dynamic ring network communication data of the pole-mounted switch for communication status monitoring in step S01 is as follows: The physical layer signal of the ring network communication link is continuously sampled by the built-in edge computing FTU (feeder terminal unit). The physical layer signal is the real-time received optical power signal of the ring network communication link. The ring network communication link acquires real-time optical power sampling frames and generates a time-continuous optical power sampling frame sequence. A fixed sliding statistical window of 200ms is set up to check the continuity of the sampling frames in the optical power sampling frame sequence. If there are no gaps in the timing of the sampling frames within the sliding window, the check result is that the sampling frames are continuous; otherwise, if there are gaps in the timing of the sampling frames within the sliding window, the check result is that the sampling frames are discontinuous. When the verification result shows that the sampling frames are continuous, the average optical power of all sampling frames within the sliding window is calculated and compared with the preset received optical power threshold range. If the average optical power does not meet the threshold range, the ring network communication status is determined to be invalid; otherwise, the ring network communication status is determined to be normal. When the verification result shows that the sampling frames are discontinuous, the ring network communication status is directly determined to be invalid, and the determination result is stored in the local cache of the edge computing FTU for subsequent self-healing control. According to the "Technical Specification for Power Optical Transmission Network Engineering" and the nominal parameters of the industrial-grade optical module, the general effective range of normal received optical power for industrial optical modules is -12dBm to -3dBm, where -3dBm is the upper limit of the threshold and -12dBm is the lower limit of the threshold. Therefore, in this embodiment, the preset received optical power threshold range is -12dBm to -3dBm.

[0019] In this embodiment, it should be specifically explained that the details of ring network waveform symmetry sensing and local fault identification in step S02 are as follows: Synchronously collect the three-phase voltages of the ring network in the monitoring area through a voltage sampling transformer, and obtain the A, B, C three-phase voltage waveforms within a continuous time period; If all the A, B, C three-phase voltage waveforms are standard sine waves and the three-phase amplitudes are equal, the identification result is that the ring network is normal; otherwise, the identification result is that the ring network has a fault.

[0020] In this embodiment, it should be specifically noted that in step S03, the specific content of fault point location based on traveling wave head detection is as follows: Based on the local fault identification result of the ring network waveform symmetry perception in step S02, when the identification result is a ring network fault, the precise positioning of the upstream and downstream of the fault section of the pole-mounted switch is completed, and the specific positioning logic is as follows: Collect transient current traveling wave signals through the high-frequency current sensor built in the edge computing FTU. When a ring network fault is identified, the waveform cache is frozen as a traveling wave waveform sequence, and the process enters the fault analysis process; Traveling wave head detection, extracting candidate wave head moments: use the wavelet transform modulus maximum method to identify waveform singular points, determine the singular points as candidate traveling wave heads, and record the arrival time, wave head polarity and amplitude of each candidate wave head; The specific content of identifying waveform singular points by the wavelet transform modulus maximum method is as follows: perform conventional denoising processing on the cached traveling wave waveform sequence, select db4 to perform multi-layer dyadic wavelet decomposition on the traveling wave waveform sequence to obtain wavelet coefficient sequences at different scales. If the absolute value of the wavelet coefficient at a certain point is greater than that of the left and right adjacent points, the point is a modulus maximum point and is identified as a waveform singular point; The specific decomposition content is: call the fixed orthogonal low-pass and high-pass decomposition filters matched with the db4 wavelet, reverse and flip the filter array to slide and fit on the traveling wave waveform sequence. During the sliding process, each value of the filter is multiplied one by one with the waveform value at the corresponding overlapping position, then all the products are added to obtain an output value. The filter slides backward point by point, repeats the multiplication and summation operation, traverses the entire traveling wave sequence, and finally generates a whole continuous convolution result sequence. Then, the convolution result is subjected to two-times point-interval downsampling, the high-frequency downsampling output data is the wavelet coefficient sequence of this scale, and the low-frequency downsampling data is used as the input for the next layer of decomposition; the convolution and dyadic extraction operations are continuously repeated only for the low-frequency component of the previous layer, and the preset number of layers of dyadic decomposition is completed layer by layer. Each layer can output a set of wavelet coefficient sequences corresponding to the scale, and the set of all layer output sequences is the multi-scale wavelet coefficient sequence; Sort according to the arrival time to obtain the wave head sequence, The first wave head in the wave head sequence that exceeds the amplitude threshold is determined as the initial forward traveling wave, and the one with the same The first subsequent wave head with the same wave head polarity is selected as the fault point reflected wave ; Based on Arrival time at the measuring end and Returning to the measurement end, a round-trip time difference analysis is performed, wherein the round-trip time difference is... Return measurement time and The difference in arrival times at the measurement end; The fault distance is calculated based on the pre-defined traveling wave propagation velocity and the round-trip time difference. The formula for calculating the fault distance is as follows: ,in Indicates the distance to the fault. This indicates the pre-defined traveling wave propagation speed (approximately 2.9 × 10⁸ m / s for overhead lines and approximately 1.4 to 1.6 × 10⁸ m / s for power cables). This represents the round-trip propagation time difference; The device moves along the direction of the traveling wave, and the displacement is the fault distance, thus completing the fault location determination.

[0021] In this embodiment, it should be specifically explained that the specific content of the local self-healing control of the pole-mounted switch in step S04, which combines the communication status and the fault location, is as follows: Based on the communication status obtained in step S01, distinguish between the normal self-healing logic and the failure self-healing logic of the ring network communication: when the ring network communication status is normal, execute the normal self-healing logic of the ring network communication; when the ring network communication status fails, execute the failure self-healing logic of the ring network communication. Based on the fault location results, output the corresponding pole-mounted switch opening and closing control commands: output pole-mounted switch opening and closing control commands based on the normal self-healing logic of ring network communication; output pole-mounted switch opening and closing control commands based on the failure self-healing logic of ring network communication.

[0022] In this embodiment, it should be specifically explained that the specific content of the on-pole switch opening and closing control command output based on the normal self-healing logic of ring network communication is as follows: When the ring network communication is normal, the fault point is isolated through the communication network. The fault location result is synchronized to the built-in edge computing FTU in the ring network. Each pole-mounted switch outputs a trip command to the pole-mounted switches on both sides of the fault point according to the received fault section information, thus completing the isolation of the fault section. It also outputs a closing command to the pole-mounted switches in the non-fault section, thus restoring the power supply connection of the non-fault section.

[0023] In this embodiment, it should be specifically explained that the specific content of the output pole-mounted switch opening and closing control command based on the ring network communication failure self-healing logic is as follows: The ring network line is installed with pole-mounted switches a, b, c, d, ..., n in sequence from the power supply side to the load side. Among them, pole-mounted switch a is the first switch closest to the power supply side. The fault section is determined based on the location of the fault point. When the fault point is located between b and c, the fault section is segment bc. a and b are upstream of the fault point, and c, d, ..., n are downstream of the fault point. When a fault occurs, the pole-mounted switch automatically disconnects, and the circuit is tested step by step starting from the power supply side: Switch a: Upon detecting incoming power, start timing for time X. If the voltage stabilizes within 7 seconds, output the closing command a. Here, X is the power-on confirmation delay time, ranging from 2 to 7 seconds. This scheme uses a fixed value of 7 seconds to avoid instantaneous voltage fluctuations and transient interference from reclosing. Switch b: When switch a closes, switch b detects the incoming power, starts the X time limit timer, and outputs a switch b closing command within 7 seconds after the voltage stabilizes. After switch b is closed, power is supplied to the fault section. At this time, switch b is within the Y time limit after closing. It detects the loss of closing voltage and outputs the b trip command. Here, Y is the fault instantaneous detection opening time limit, which is the short-term fault discrimination window after closing. It is set to 0.5 seconds and is used to accurately identify the permanent fault section. Switch C outputs a trip command based on the closing command of switch B; A closing command is sent to the switch downstream of the fault point to restore power supply.

[0024] In this embodiment, it should be specifically explained that the specific content of performing automatic fault verification of the switch operation status and power supply status in step S05 is as follows: Receives and executes control commands for opening and closing pole-mounted switches based on the normal self-healing logic of ring network communication and the failure self-healing logic of ring network communication. The fault section is isolated based on the tripping command; After the switch is opened or closed, the system terminal collects the switch position status and line energization status in real time and transmits them back to the distribution master station in real time; the distribution master station verifies the switch operation status and line power supply status one by one.

[0025] The main difference between this implementation and existing technologies lies in the fact that this embodiment accurately distinguishes between two operating scenarios: normal ring network communication and communication failure, and matches a dedicated self-healing control strategy accordingly. When communication is normal, it relies on network-wide data collaboration to achieve precise fault isolation and power supply reconfiguration, ensuring self-healing accuracy. Under abnormal conditions such as communication interruption, packet loss, and delay, it automatically switches to local step-by-step self-healing logic when there is no communication. Through step-by-step closing verification of power supply side switches and precise interlocking of fault sections, it achieves autonomous fault handling in the network outage state. This solves the problem of paralysis of self-healing function and reliance on manual repair when communication is abnormal in traditional technologies, greatly improving the environmental adaptability and operational stability of the ring network power distribution self-healing system. By synchronously acquiring the three-phase voltage waveform of the ring network through the current transformer, the local fault is accurately identified based on the symmetry and amplitude consistency of the three-phase waveform. This avoids the problems of missed fault detection, misjudgment, and judgment lag that are easy to occur in traditional technologies, effectively avoids unnecessary line outages and switch malfunctions, and greatly improves the precision of distribution network fault identification and power supply stability. After completing the fault isolation and power restoration self-healing actions, the switch opening and closing status and the line energization status can be collected in real time and transmitted back to the distribution master station. The master station completes dual verification of the action status and power supply status, forming a closed-loop control system of local self-healing execution + cloud verification and supervision. It can promptly detect abnormal self-healing actions, ensure the integrity and accuracy of fault self-healing, and comprehensively improve the power supply reliability and intelligent operation and maintenance level of the medium-voltage ring network distribution system.

[0026] In conclusion, 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, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

[0027] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A method for self-healing local faults in pole-mounted switches in ring network power distribution based on edge computing, characterized in that: Includes the following steps: Step S01: Acquire ring network communication data in the monitoring area for communication status monitoring: Real-time acquisition of dynamic ring network communication data in the monitoring area through the built-in edge computing FTU, and judgment of communication status; Step S02: Ring network waveform symmetry sensing and local fault identification: Synchronously collect the three-phase voltage of the ring network in the monitoring area, obtain the ring network voltage waveform diagram, and perform local fault identification of the ring network in the monitoring area based on the ring network voltage waveform diagram; Step S03: Fault location based on traveling wave front detection: Based on the local fault identification results of the ring network, the location of the fault point is determined when a ring network fault occurs; Step S04: Execute local self-healing control of pole-mounted switch based on communication status and fault location: Based on the communication status obtained in step S01, distinguish between normal self-healing logic of ring network communication and failure self-healing logic of ring network communication, and output the corresponding pole-mounted switch opening and closing control command based on the fault location result. Step S05: Perform automatic fault verification of switch operation status and power supply status: Execute control commands to isolate the faulty section and automatically verify the switch operation status and power supply status.

2. The method for self-healing ring network power distribution with local faults of pole-mounted switches based on edge computing according to claim 1, characterized in that: In step S01, the specific details of acquiring dynamic ring network communication data of the pole-mounted switch for communication status monitoring are as follows: By continuously sampling the physical layer signal of the ring network communication link through the built-in edge computing FTU, the ring network communication link acquires real-time optical power sampling frames and generates a time-continuous optical power sampling frame sequence. A fixed sliding statistical window of 200ms is set up to check the continuity of the sampling frames in the optical power sampling frame sequence. If there are no gaps in the timing of the sampling frames within the sliding window, the check result is that the sampling frames are continuous; otherwise, if there are gaps in the timing of the sampling frames within the sliding window, the check result is that the sampling frames are discontinuous. When the verification result is that the sampling frames are continuous, the average optical power of all sampling frames within the sliding window is calculated and compared with the preset received optical power threshold range. If the average optical power does not meet the threshold range, the ring network communication status is determined to be invalid; otherwise, the ring network communication status is determined to be normal. When the verification result is that the sampling frames are discontinuous, the ring network communication status is directly determined to be invalid.

3. The method for self-healing ring network power distribution with local faults of pole-mounted switches based on edge computing according to claim 1, characterized in that: In step S02, the specific details of ring network waveform symmetry sensing and local fault identification are as follows: The three-phase voltage of the ring network in the monitoring area is synchronously collected by the voltage sampling transformer to obtain the three-phase voltage waveforms of A, B, and C over a continuous time period. If the voltage waveforms of phases A, B, and C are all standard sine waves and the amplitudes of the three phases are equal, the identification result is that the ring network is normal; otherwise, the identification result is that the ring network is faulty.

4. The method for self-healing ring network power distribution with local faults of pole-mounted switches based on edge computing according to claim 1, characterized in that: In step S03, the specific details of fault point localization based on traveling wave front detection are as follows: Based on the local fault identification results of the ring network waveform symmetry sensing in step S02, when the identification result is a ring network obstacle, the upstream and downstream of the faulty section of the pole-mounted switch is accurately located. The specific location logic is as follows: Transient current traveling wave signals are acquired by high-frequency current sensors in the built-in edge computing FTU. When a ring network obstacle is identified, the waveform is frozen and buffered as a traveling wave waveform sequence, and then the fault analysis process is initiated. Traveling wave front detection and extraction of candidate wave front times: Wavelet transform modulus maxima method is used to identify waveform singularities and determine the singularities as candidate traveling wave fronts. The arrival time, wave front polarity and amplitude of each candidate wave front are recorded. Arrange them in chronological order of arrival to obtain the wavefront sequence. The first wavefront in the wavefront sequence to exceed the amplitude threshold is identified as the initial positive traveling wave, and a wavefront is selected that is consistent with... The first subsequent wavefront with the same wavefront polarity is used as the reflected wave at the fault point. ; based on Arrival time at the measuring end and Returning to the measurement end, a round-trip time difference analysis is performed, wherein the round-trip time difference is... Return measurement time and The difference in arrival times at the measurement end; The fault distance is calculated based on the pre-defined traveling wave propagation speed and the round-trip propagation time difference; The device moves along the direction of the traveling wave, and the displacement is the fault distance, thus completing the fault location determination.

5. A method for self-healing ring network power distribution with local faults of pole-mounted switches based on edge computing as described in claim 1, characterized in that: In step S04, the specific details of executing the local self-healing control of the pole-mounted switch in conjunction with the communication status and fault location are as follows: Based on the communication status obtained in step S01, distinguish between the normal self-healing logic and the failure self-healing logic of the ring network communication: when the ring network communication status is normal, execute the normal self-healing logic of the ring network communication; when the ring network communication status fails, execute the failure self-healing logic of the ring network communication. Based on the fault location results, output the corresponding pole-mounted switch opening and closing control commands: output pole-mounted switch opening and closing control commands based on the normal self-healing logic of ring network communication; output pole-mounted switch opening and closing control commands based on the failure self-healing logic of ring network communication.

6. A method for self-healing ring network power distribution with local faults of pole-mounted switches based on edge computing as described in claim 5, characterized in that: The specific content of the output pole-mounted switch opening and closing control command based on the normal self-healing logic of ring network communication is as follows: When the ring network communication is normal, the fault point is isolated through the communication network. The fault location result is synchronized to the built-in edge computing FTU in the ring network. Each pole-mounted switch outputs a trip command to the pole-mounted switches on both sides of the fault point according to the received fault section information, thus completing the isolation of the fault section. It also outputs a closing command to the pole-mounted switches in the non-fault section, thus restoring the power supply connection of the non-fault section.

7. A method for self-healing ring network power distribution with local faults of pole-mounted switches based on edge computing as described in claim 5, characterized in that: The specific content of the output pole-mounted switch opening and closing control command based on the ring network communication failure self-healing logic is as follows: The ring network line is installed with pole-mounted switches a, b, c, d, ..., n in sequence from the power supply side to the load side. Among them, pole-mounted switch a is the first switch closest to the power supply side. The fault section is determined based on the location of the fault point. When the fault point is located between b and c, the fault section is segment bc. a and b are upstream of the fault point, and c, d, ..., n are downstream of the fault point. When a fault occurs, the pole-mounted switch automatically disconnects, and the circuit is tested step by step starting from the power supply side: Switch A: Upon detecting incoming power, start the X-time limit timer. If the voltage stabilizes within 7 seconds, output the A closing command. Switch b: When switch a closes, switch b detects the incoming power, starts the X time limit timer, and outputs a switch b closing command within 7 seconds after the voltage stabilizes. After switch b closes, power is supplied to the fault section. At this time, switch b is within the Y time limit after closing. When the closing voltage loss is detected, switch b opens and outputs a command to open. Switch C outputs a trip command based on the closing command of switch B; A closing command is sent to the switch downstream of the fault point to restore power supply.

8. A method for self-healing ring network power distribution with local faults of pole-mounted switches based on edge computing as described in claim 1, characterized in that: In step S05, the specific details of performing automatic fault verification of the switch's operating status and power supply status are as follows: Receives and executes control commands for opening and closing pole-mounted switches based on the normal self-healing logic of ring network communication and the failure self-healing logic of ring network communication. The fault section is isolated based on the tripping command; After the switch is opened or closed, the system terminal collects the switch position status and line energization status in real time and transmits them back to the distribution master station in real time; the distribution master station verifies the switch operation status and line power supply status one by one.

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