Middle and low voltage distribution network equipment fault monitoring and isolating method and system

Abstract

The invention discloses a medium and low voltage distribution network equipment fault monitoring and isolating method and system, and the method comprises the steps: determining a first core terminal based on the historical working state data of terminal equipment in a distribution network; dividing the terminal equipment into a plurality of target partitions based on the position information of the first core terminal and the second terminal; adjusting a fault positioning strategy and a fault isolation strategy of the power distribution network based on the fault information of the terminal equipment in each target partition; based on the edge calculation capability of the terminal equipment, performing preliminary analysis and positioning on the power distribution network fault; the partition master control platform of the power distribution network executes a fault positioning strategy of the power distribution network in a single target partition; and executing a fault isolation strategy of the power distribution network based on the fault positioning result of the power distribution network. According to the invention, fault analysis is carried out based on partition processing and edge calculation, the fault positioning isolation strategy is adjusted by using the fault information, and the timeliness and accuracy of distribution network fault positioning isolation are improved.

Description

Technical Field

[0001] This invention relates to the field of power distribution network fault monitoring technology, and in particular to a method and system for fault monitoring and isolation of medium and low voltage power distribution network equipment. Background Technology

[0002] With the continuous upgrading of distribution network technology and the increasing number of distributed power sources connected to the distribution network, traditional distribution network fault location methods face significant challenges, resulting in a substantial decrease in accuracy. Fault location methods based on machine learning, however, are independent of the distribution network topology and are therefore more adaptable to the characteristics of today's distribution networks. However, the difficulty in applying machine learning methods lies in data acquisition; obtaining accurate and reliable data in a complex and ever-changing distribution network is a key challenge. Distribution networks contain numerous terminal devices, such as Data Terminal Units (DTUs), Feeder Terminal Units (FTUs), and Fault Indicator Units (FIUs). These terminal units are located in different places and have different functions, but they all collect distribution network data, providing crucial data sources for fault location and isolation. However, due to the complex environment and numerous interferences in distribution networks, these terminal devices frequently fail, exhibiting malfunctions in data acquisition and switch control, leading to the inability to correctly execute fault location and isolation strategies. Therefore, how to implement fault location and isolation strategies in the event of terminal device failure, thereby improving the safety and reliability of the distribution network, is a crucial technical problem that must be solved.

[0003] Existing technology, invention patent application CN116754901A, proposes a distribution network fault analysis and management platform based on rapid location. This platform includes: a hierarchical, progressive approach to systematically investigate fault areas, detecting various equipment and lines within the fault area to gain a more comprehensive understanding of the distribution network situation, improving the comprehensiveness and accuracy of fault detection, and enabling timely repair or equipment replacement. It employs automated methods, combining historical data to analyze relevant data from various power equipment and lines, eliminating the need for manual intervention, reducing manpower and operational risks, and improving the timeliness of fault detection. It can quickly locate fault points and their causes, promptly identifying and resolving fault problems, thereby ensuring the normal operation of the power system, improving its reliability and stability, and reducing the risk of power outages. However, this invention does not solve the aforementioned problems. Summary of the Invention

[0004] Purpose of the invention: To address the above problems, this invention proposes a method and system for fault monitoring and isolation of medium and low voltage distribution network equipment. Technical solution

[0005] In a first aspect, the present invention provides a method for fault monitoring and isolation of medium and low voltage distribution network equipment, the method comprising: S1. Based on the historical operating status data of terminal equipment in the distribution network, determine the first core terminal among the terminal equipment; the terminal equipment includes DTU, FTU, and FIU. S2. Based on the location information of the first core terminal and the second terminal in the distribution network, the terminal equipment is divided into multiple target zones; S3. Based on the fault information of the terminal equipment in each target zone, adjust the fault location strategy and fault isolation strategy of the distribution network; S4. Based on the edge computing capabilities of terminal devices, perform preliminary analysis and location of power distribution network faults; S5. The distribution network's zone-level central control platform executes the fault location strategy for the distribution network within a single target zone. S6. Execute the fault isolation strategy of the distribution network based on the fault location results of the distribution network.

[0006] Preferably, S1 includes: S11. Select the DTU and FTU among the terminal equipment in the distribution network, and query the working status data of the DTU and FTU within the preset historical time period. S12. Divide the historical period into multiple time windows and obtain the historical work status data within each time window; S13. Analyze the terminal utilization rate of terminal devices based on historical working status data within a time window; the historical working status data includes the amount of data collected, the amount of processing computation, and the amount of instruction control of the terminal devices; the terminal utilization rate is the weighted average of the amount of data collected, the amount of processing computation, and the amount of instruction control. S14. Selecting the first core terminal based on the terminal usage rate of multiple time windows includes: for each terminal device, determining whether the usage rate in each time window exceeds a preset value; if it does, setting the corresponding time window as the first window; determining the number of first windows in a preset historical period; if it exceeds a first threshold, the corresponding terminal device is the first core terminal; and terminal devices other than the first core terminal are the second terminals.

[0007] Preferably, S2 includes: S21. Obtain the location information of each first core terminal; S22. Calculate the terminal distance between each pair of first core terminals. If the terminal distance is less than the distance threshold, select the one with the smaller number of first windows and cancel its identity as a first core terminal. S23. Based on the location information of the terminal devices, calculate the distance from each second terminal to each first core terminal; assign the second terminal to the target partition where the nearest first core terminal is located, that is, assign all terminal devices to several target partitions.

[0008] Preferably, S3 includes: S31. Obtain fault upload information from the terminal device; the fault upload information includes fault code, fault time, and data before and after the fault. S32. Determine the fault type of the terminal device based on the fault code. The fault type includes Class I fault, Class II fault, and Class III fault. The Class I fault is a data acquisition function fault of the terminal device, the Class II fault is a data processing and analysis function fault of the terminal device, and the Class III fault is a control function fault of the terminal device. S33. Adjust the fault location and isolation strategy of the distribution network in the target area based on the fault type; including: for terminal equipment with type I faults, the data source of terminal equipment with type I faults is no longer considered in the fault location analysis of the regional control platform; for terminal equipment with type II faults, the self-analysis calculation function of terminal equipment with type II faults is shielded in the edge computing analysis of terminal equipment; for terminal equipment with type III faults, upstream fault-free terminal equipment is selected for control in the fault isolation process of the distribution network.

[0009] Preferably, S4 includes: S41. Determine whether the second terminal in the target partition contains a second core terminal. The second core terminal is a second terminal without Class I faults and without Class II faults. If yes, set the second core terminal as the field analysis terminal and proceed to S44. Otherwise, proceed to S42. S42. Determine whether the second terminal in the target partition contains a third core terminal, wherein the third core terminal is a second terminal with one type of fault but no type II fault; if yes, then set the third core terminal as the field analysis terminal and proceed to S44; otherwise, proceed to S43. S43. Set the first core terminal as the field analysis terminal and proceed to S44; S44. Select data from terminal devices adjacent to the field analysis terminal that have no type of fault, perform field fault analysis based on the edge computing function of the field analysis terminal, and upload the analysis results to the zone control platform.

[0010] Preferably, S6 includes: S61. Determine the location of the fault in the power distribution network; S62. Determine the associated switchgear for locating faults in the distribution network; S63. Determine the first control device, which is a terminal device capable of controlling the opening and closing of the associated switching device; S64. Determine whether the first control device has any of the three types of faults; if not, send a disconnect command to the first control device; if yes, proceed to S65. S65. Determine the second control device, which is the nearest upstream device without any type III faults, and send a disconnect command to the second control device.

[0011] Secondly, the present invention also provides a fault monitoring and isolation system for medium and low voltage distribution network equipment, the system comprising: a central station server, a regional central station platform, and terminal equipment; The central station server is used for centralized monitoring of equipment and lines on the power distribution network; the terminal equipment includes DTU, FTU, and FIU, which are used for on-site collection and analysis of power distribution network data and on-site control. The regional control platform is used for fault location analysis of target zones in the distribution network; The main station server includes a core terminal determination module and a target partitioning module; The partition control platform includes a strategy adjustment module and a fault isolation module; The DTU and FTU in the terminal device include edge computing modules.

[0012] Preferably, the core terminal determination module is used to select a first core terminal and a second terminal among the terminal devices in the distribution network; the first core terminal is a terminal device selected based on terminal utilization rate; the second terminal is other terminal devices besides the first core terminal. The target partitioning module is used to calculate the distance from each second terminal to each first core terminal based on the location information of the terminal devices; and to assign the second terminals to the target partition where the nearest first core terminal is located, that is, to divide all terminal devices into several target partitions.

[0013] Preferably, the strategy adjustment module is used to determine the fault type of the terminal equipment based on the fault code, wherein the fault type includes Class I fault, Class II fault, and Class III fault; and to adjust the fault location and isolation strategy of the distribution network in the target area based on the fault type, including, for Class I fault terminal equipment, no longer considering the data source of Class I fault terminal equipment in the fault location analysis of the regional control platform; for Class II fault terminal equipment, disabling the self-analysis calculation function of Class II fault terminal equipment in the edge computing analysis of the terminal equipment; and for Class III fault terminal equipment, selecting upstream fault-free terminal equipment for control during the fault isolation process of the distribution network.

[0014] Preferably, the fault isolation module is used to determine the location of a fault in the power distribution network; determine the associated switching equipment at the location of the fault in the power distribution network; determine a first control device, which is a terminal device capable of controlling the opening and closing of the associated switching equipment; determine whether the first control device has three types of faults; if not, send a disconnect command to the first control device; if not, determine a second control device, which is the nearest upstream device without three types of faults, and send a disconnect command to the second control device.

[0015] Thirdly, the present invention also provides an electronic device, including a memory, a processor, and a computer program stored in the memory and capable of running on the processor. Preferably, when the processor executes the computer program, it implements the steps in the method for fault monitoring and isolation of medium and low voltage distribution network equipment.

[0016] Fourthly, the present invention also provides a computer-readable storage medium having a computer program stored thereon, preferably wherein the computer program, when executed by a processor, implements the steps in the method for fault monitoring and isolation of medium and low voltage distribution network equipment.

[0017] The present invention has the following advantages over the prior art: 1. The present invention first divides the power distribution network into zones based on the first core terminal in the terminal equipment, and performs fault location analysis on the power distribution network by zone, which can improve the timeliness of fault analysis and adjust the data source in a timely and efficient manner after equipment faults are detected. 2. In the process of fault location and analysis of the power distribution network, this invention considers the fault conditions of various terminal equipment and adjusts the fault location and fault isolation strategies of the power distribution network according to different fault types, thereby improving the safety and accuracy of power distribution network fault handling. 3. In the process of fault analysis of the distribution network, this invention not only uses the central control platform in the partition for comprehensive analysis, but also uses the edge computing capabilities of the DTU and FTU in the partition to improve accuracy and real-time performance. 4. In the process of fault isolation in the distribution network, this invention fully considers the control function failures of DTU and FTU equipment. By selecting upstream intermediate equipment without control function failures, the fault is isolated, thereby improving the safety of the distribution network. Attached Figure Description

[0018] Figure 1 A flowchart of a method for fault monitoring and isolation of medium and low voltage distribution network equipment provided in an embodiment of the present invention; Figure 2 A flowchart of a method for determining a first core terminal provided in an embodiment of the present invention; Figure 3A flowchart of a target partitioning method provided in an embodiment of the present invention; Figure 4 A flowchart illustrating a fault location strategy and fault isolation strategy adjustment method provided in an embodiment of the present invention; Figure 5 This is a schematic diagram of a fault monitoring and isolation system for medium and low voltage distribution network equipment provided in an embodiment of the present invention. Detailed Implementation

[0019] Obviously, many modifications and variations made by those skilled in the art based on the spirit of this invention fall within the scope of protection of this invention.

[0020] Those skilled in the art will understand that, unless specifically stated otherwise, the singular forms “a,” “an,” “the,” and “the” used herein may also include the plural forms. It should be further understood that the term “comprising” as used in this specification means the presence of the stated features, integers, steps, operations, elements, and / or components, but does not exclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and / or groups thereof. It should be understood that when an element or component is referred to as “connected” to another element or component, it may be directly connected to the other element or component, or there may be intermediate elements or components. The term “and / or” as used herein includes any and all combinations of one or more of the associated listed items.

[0021] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention. Example 1

[0022] With the continuous upgrading of distribution network technology and the increasing number of distributed power sources connected to the distribution network, traditional distribution network fault location methods face significant challenges, with their accuracy greatly reduced. Fault location methods based on machine learning, however, are independent of the distribution network topology and are therefore more adaptable to the characteristics of today's distribution networks. However, the focus of machine learning applications is on data rather than models; how to obtain accurate and reliable data in a complex and variable distribution network is a key challenge. Distribution networks contain numerous terminal devices, such as Data Terminal Units (DTUs), Feeder Terminal Units (FTUs), and Fault Indicator Units (FIUs). These terminal units are located in different places and have different functions, but they all collect distribution network data, providing crucial data sources for fault location and isolation. However, due to the complex environment and numerous interferences in distribution networks, these terminal devices often fail, exhibiting malfunctions in data acquisition and switch control, leading to the inability to correctly execute fault location and isolation strategies. Therefore, how to implement fault location and isolation strategies in the event of terminal device failure, thereby improving the safety and reliability of the distribution network, is a crucial technical problem that must be solved.

[0023] This invention provides a fault monitoring and isolation system for medium and low voltage distribution network equipment. Please refer to the following for details. Figure 1 , Figure 1 A flowchart of a method for fault monitoring and isolation of medium and low voltage distribution network equipment provided in this embodiment of the invention. The system includes: S1. Based on historical operating status data of terminal equipment in the distribution network, determine the first core terminal among the terminal equipment; the terminal equipment includes DTU, FTU, and FIU; please refer to [reference needed] for details. Figure 2 , Figure 2 A flowchart of a first core terminal determination method provided in an embodiment of the present invention includes: S11. Select the DTU and FTU among the terminal equipment in the distribution network, and query the working status data of the DTU and FTU within the preset historical time period. Among them, both DTU and FTU have certain edge computing capabilities and can automatically record working status data and upload it to the main station and / or cloud platform on a regular basis; since the FIU focuses on fault indication and judges faults by detecting fault current, its function is relatively simpler than that of DTU and FTU, so FIU is not considered when selecting the first core terminal. S12. Divide the historical period into multiple time windows and obtain the historical work status data within each time window; S13. Analyze the terminal utilization rate of terminal devices based on historical working status data within a time window; the historical working status data includes the amount of data collected, the amount of processing computation, and the amount of instruction control of the terminal devices; the terminal utilization rate is the weighted average of the amount of data collected, the amount of processing computation, and the amount of instruction control. Wherein, the amount of data collected = the average length of the data collected by the terminal device within the time window × the number of data; the amount of processing computation = the processor clock frequency of the terminal device × the number of floating-point operations × the time length of the time window; the amount of instruction control = the average length of the instructions sent by the terminal device within the time window × the number of instructions; wherein, the terminal utilization rate is the weighted average of the amount of data collected, the amount of processing computation, and the amount of instruction control; in an optional embodiment, let the terminal utilization rate = a × amount of data collected + b × amount of processing computation + c × amount of instruction control, where a + b + c = 1, and the values ​​of a, b, and c can be configured according to the staff; for example, in an optional embodiment, let a = 0.3, b = 0.5, c = 0.2.

[0024] S14. Selecting the first core terminal based on the terminal usage rate of multiple time windows includes: for each terminal device, determining whether the usage rate in each time window exceeds a preset value; if it does, setting the corresponding time window as the first window; determining the number of first windows in a preset historical period; if it exceeds a first threshold, the corresponding terminal device is the first core terminal; and terminal devices other than the first core terminal are the second terminals. The preset values ​​are obtained through experience. Since DTU and FTU have certain functional differences, different preset values ​​can be configured for DTU and FTU respectively to improve the accuracy of system judgment. Similarly, for ease of configuration, only a relatively broad and moderate preset value can be configured for DTU and FTU.

[0025] Furthermore, after determining the first core terminal and the second terminal, all terminal devices are divided into multiple target partitions. The goal of partitioning is to ensure that each first core terminal is assigned to one target partition, and that each target partition contains only one first core terminal.

[0026] S2. Based on the location information of the first core terminal and the second terminal in the distribution network, the terminal equipment is divided into multiple target zones; please refer to [reference needed] for details. Figure 3 , Figure 3 A flowchart of a target partitioning method provided in an embodiment of the present invention includes: S21. Obtain the location information of each first core terminal; Each terminal device is equipped with a positioning module, which can obtain the location information of each terminal device. S22. Calculate the terminal distance between each pair of first core terminals. If the terminal distance is less than the distance threshold, select the one with the smaller number of first windows and cancel its identity as a first core terminal. This step ensures that the multiple primary core terminals are relatively far apart, which facilitates the subsequent partitioning steps; S23. Based on the location information of the terminal devices, calculate the distance from each second terminal to each first core terminal; assign the second terminal to the target partition where the nearest first core terminal is located, that is, assign all terminal devices to several target partitions; Based on the above steps, the present invention first divides the power distribution network into zones based on the first core terminal in the terminal equipment, and performs fault location analysis on the power distribution network by zone, which can improve the timeliness of fault analysis and adjust the data source in a timely and efficient manner after the equipment fault is detected.

[0027] S3. Based on the fault information of the terminal equipment in each target zone, adjust the fault location strategy and fault isolation strategy of the distribution network; please refer to [reference needed] for details. Figure 4 , Figure 4 A flowchart of a fault location strategy and fault isolation strategy adjustment method provided in an embodiment of the present invention includes: S31. Obtain fault upload information from the terminal device; the fault upload information includes fault code, fault time, and data before and after the fault. S32. Determine the fault type of the terminal device based on the fault code. The fault type includes Class I fault, Class II fault, and Class III fault. The Class I fault is a data acquisition function fault of the terminal device, the Class II fault is a data processing and analysis function fault of the terminal device, and the Class III fault is a control function fault of the terminal device. Among them, DTU, FTU, and FIU all have data acquisition functions, so they are all likely to experience Class I faults; DTU and FTU have edge computing capabilities, so they are likely to experience Class II faults; while the data processing function of FIU is simply to indicate based on the fault current, which is relatively reliable and rarely fails, so this invention does not consider Class II faults of FIU; DTU and FTU have control functions for circuit breakers and other switches, so they are also likely to experience Class III faults. S33. Adjust the fault location and isolation strategy of the distribution network in the target area based on the fault type; including: for terminal equipment with type I faults, the data source of terminal equipment with type I faults will no longer be considered in the fault location analysis of the regional control platform; for terminal equipment with type II faults, the self-analysis calculation function of terminal equipment with type II faults will be shielded in the edge computing analysis of terminal equipment; for terminal equipment with type III faults, upstream fault-free terminal equipment will be selected for control in the fault isolation process of the distribution network. Based on the above steps, this invention considers the fault conditions of various terminal devices during the fault location and analysis of the distribution network, and adjusts the fault location and fault isolation strategies of the distribution network according to different fault types, thereby improving the safety and timeliness of distribution network fault handling.

[0028] S4. Based on the edge computing capabilities of terminal devices, perform preliminary analysis and location of power distribution network faults; S41. Determine whether the second terminal in the target partition contains a second core terminal. The second core terminal is a second terminal without Class I faults and without Class II faults. If yes, set the second core terminal as the field analysis terminal and proceed to S44. Otherwise, proceed to S42. Among them, since the first core terminal has a large data processing volume, the second core terminal is selected first to perform the fault analysis function. S42. Determine whether the second terminal in the target partition contains a third core terminal, wherein the third core terminal is a second terminal with one type of fault but no type II fault; if yes, then set the third core terminal as the field analysis terminal and proceed to S44; otherwise, proceed to S43. S43. Set the first core terminal as the field analysis terminal and proceed to S44; S44. Select data from terminal devices adjacent to the field analysis terminal that do not have any type of fault, perform field fault analysis based on the edge computing function of the field analysis terminal, and upload the analysis results to the zone control platform. The first core terminal is a terminal without any faults. This means that if the first core terminal in the target partition experiences any fault, another terminal is selected as the first core terminal. Furthermore, the first core terminals are selected sequentially based on the number of first windows in steps S1-S2. Preferably, the on-site fault analysis is performed using the edge computing capabilities of the terminal device. The specific analysis method can be matrix algorithms, machine learning algorithms, etc. Preferably, when using machine learning algorithms, the selected data is data from adjacent terminal devices without any type of fault.

[0029] Based on the above steps, in the process of fault analysis of the distribution network, this invention not only uses the central control platform in the partition for comprehensive analysis, but also uses the edge computing capabilities of the DTU and FTU in the partition to improve accuracy and real-time performance.

[0030] S5. The distribution network's zone-level central control platform executes the fault location strategy for the distribution network within a single target zone. This invention triggers the fault location algorithm of the partition control platform after a failure in edge computing, further improving accuracy; and improves timeliness through edge computing, avoiding an excessive computational burden on the partition control platform.

[0031] The fault location strategy used in the regional control platform is an artificial intelligence method in the prior art. The prior art has a variety of algorithms such as genetic algorithm, particle swarm algorithm, and annealing algorithm in the fault location of distribution network, as well as combinations and improvements of multiple algorithms. Those skilled in the art can select these algorithms according to the actual situation. These algorithms are not the focus of this invention.

[0032] S6. Execute the fault isolation strategy of the distribution network based on the fault location results of the distribution network; S61. Determine the location of the fault in the power distribution network; S62. Determine the associated switchgear for locating faults in the distribution network; S63. Determine the first control device, which is a terminal device capable of controlling the opening and closing of the associated switching device; S64. Determine whether the first control device has any of the three types of faults; if not, send a disconnect command to the first control device; if yes, proceed to S65. S65. Determine the second control device, which is the nearest upstream device without any type III faults, and send a disconnect command to the second control device.

[0033] In the process of fault isolation in the distribution network, this invention fully considers the control function failures of DTU and FTU equipment. By selecting upstream intermediate equipment without control function failures, the fault is isolated, thereby improving the safety of the distribution network. Example 2

[0034] This invention also provides a fault monitoring and isolation system for medium and low voltage distribution network equipment. Please refer to the following for details. Figure 5 , Figure 5 A schematic diagram of a fault monitoring and isolation system for medium and low voltage distribution network equipment provided in this embodiment of the invention. The system includes: Main station server, regional main station platform, terminal equipment; The central station server is used for centralized monitoring of equipment and lines on the power distribution network; The terminal equipment includes DTU, FTU, and FIU, which are used to collect and analyze power distribution network data on-site and to perform on-site control. The regional control platform is used for fault location analysis of target zones in the distribution network; The main station server includes a core terminal determination module and a target partitioning module; The partition control platform includes a strategy adjustment module and a fault isolation module; The DTU and FTU in the terminal device include edge computing modules.

[0035] Preferably, the core terminal determination module is used to select a first core terminal and a second terminal among the terminal devices in the distribution network; the first core terminal is a terminal device selected based on terminal utilization rate; the second terminal is other terminal devices besides the first core terminal. The target partitioning module is used to calculate the distance from each second terminal to each first core terminal based on the location information of the terminal devices; and to assign the second terminals to the target partition where the nearest first core terminal is located, that is, to divide all terminal devices into several target partitions.

[0036] Preferably, the strategy adjustment module is used to determine the fault type of the terminal equipment based on the fault code, wherein the fault type includes Class I fault, Class II fault, and Class III fault; and to adjust the fault location and isolation strategy of the distribution network in the target area based on the fault type, including, for Class I fault terminal equipment, no longer considering the data source of Class I fault terminal equipment in the fault location analysis of the regional control platform; for Class II fault terminal equipment, disabling the self-analysis calculation function of Class II fault terminal equipment in the edge computing analysis of the terminal equipment; and for Class III fault terminal equipment, selecting upstream fault-free terminal equipment for control during the fault isolation process of the distribution network.

[0037] Preferably, the fault isolation module is used to determine the location of a fault in the power distribution network; determine the associated switching equipment at the location of the fault in the power distribution network; determine a first control device, which is a terminal device capable of controlling the opening and closing of the associated switching equipment; determine whether the first control device has three types of faults; if not, send a disconnect command to the first control device; if not, determine a second control device, which is the nearest upstream device without three types of faults, and send a disconnect command to the second control device. Example 3

[0038] This invention also provides an electronic device, including a memory, a processor, and a computer program stored in the memory and capable of running on the processor. Preferably, when the processor executes the computer program, it implements the steps in the method for fault monitoring and isolation of medium and low voltage distribution network equipment. Example 4

[0039] This invention also provides a computer-readable storage medium storing a computer program thereon. Preferably, when the computer program is executed by a processor, it implements the steps in the method for fault monitoring and isolation of medium and low voltage distribution network equipment.

[0040] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on its differences from other embodiments. Similar or identical parts between embodiments can be referred to interchangeably. For the apparatus disclosed in the embodiments, since it corresponds to the method disclosed in the embodiments, the description is relatively simple; relevant parts can be referred to in the method section.

[0041] Those skilled in the art will further recognize that the units and algorithm steps of the various examples described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, computer software, or a combination of both. To clearly illustrate the interchangeability of hardware and software, the components and steps of the various examples have been generally described in terms of functionality in the foregoing description. Whether these functions are implemented in hardware or software depends on the specific application and design constraints of the technical solution. Those skilled in the art can use different methods to implement the described functions for each specific application, but such implementations should not be considered beyond the scope of this invention.

[0042] Finally, it should be noted that in this document, relationships such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

Claims

1. A method for fault monitoring and isolation of medium and low voltage distribution network equipment, characterized in that, The method includes: S1. Based on the historical operating status data of terminal equipment in the distribution network, determine the first core terminal among the terminal equipment; the terminal equipment includes DTU, FTU, and FIU. S2. Based on the location information of the first core terminal and the second terminal in the distribution network, the terminal equipment is divided into multiple target zones; S3. Based on the fault information of the terminal equipment in each target zone, adjust the fault location strategy and fault isolation strategy of the distribution network; S4. Based on the edge computing capabilities of terminal devices, perform preliminary analysis and location of power distribution network faults; S5. The distribution network's zone-level central control platform executes the fault location strategy for the distribution network within a single target zone. S6. Execute the fault isolation strategy of the distribution network based on the fault location results of the distribution network.

2. The method for fault monitoring and isolation of medium and low voltage distribution network equipment according to claim 1, characterized in that, S1 includes: S11. Select the DTU and FTU among the terminal equipment in the distribution network, and query the working status data of the DTU and FTU within the preset historical time period. S12. Divide the historical period into multiple time windows and obtain the historical work status data within each time window; S13. Analyze the terminal usage rate of the terminal device based on historical working status data within the time window; the historical working status data includes the amount of data collected, the amount of processing and computation, and the amount of instruction control by the terminal device. S14. Select the first core terminal based on the terminal usage rate of multiple time windows, and the terminal devices other than the first core terminal are the second terminals.

3. The method for fault monitoring and isolation of medium and low voltage distribution network equipment according to claim 2, characterized in that, S2 includes: S21. Obtain the location information of each first core terminal; S22. Calculate the terminal distance between each pair of first core terminals. If the terminal distance is less than the distance threshold, select the one with the smaller number of first windows and cancel its identity as a first core terminal. S23. Based on the location information of the terminal devices, calculate the distance from each second terminal to each first core terminal; assign the second terminal to the target partition where the nearest first core terminal is located, that is, assign all terminal devices to several target partitions.

4. The method for fault monitoring and isolation of medium and low voltage distribution network equipment according to claim 3, characterized in that, S3 includes: S31. Obtain fault upload information from the terminal device; the fault upload information includes fault code, fault time, and data before and after the fault. S32. Determine the fault type of the terminal device based on the fault code, wherein the fault type includes Class I fault, Class II fault, and Class III fault; S33. Adjust the fault location and isolation strategy of the target zone based on the fault type.

5. The method for fault monitoring and isolation of medium and low voltage distribution network equipment according to claim 4, characterized in that, S4 includes: S41. Determine whether the second terminal in the target partition contains a second core terminal. The second core terminal is a second terminal without Class I faults and without Class II faults. If yes, set the second core terminal as the field analysis terminal and proceed to S44. Otherwise, proceed to S42. S42. Determine whether the second terminal in the target partition contains a third core terminal, wherein the third core terminal is a second terminal with one type of fault but no type II fault; if yes, then set the third core terminal as the field analysis terminal and proceed to S44; otherwise, proceed to S43. S43. Set the first core terminal as the field analysis terminal and proceed to S44; S44. Select data from terminal devices adjacent to the field analysis terminal that have no type of fault, perform field fault analysis based on the edge computing function of the field analysis terminal, and upload the analysis results to the zone control platform.

6. The method for fault monitoring and isolation of medium and low voltage distribution network equipment according to claim 5, characterized in that, S6 includes: S61. Determine the location of the fault in the power distribution network; S62. Determine the associated switchgear for locating faults in the distribution network; S63. Determine the first control device, which is a terminal device capable of controlling the opening and closing of the associated switching device; S64. Determine whether the first control device has any of the three types of faults; if not, send a disconnect command to the first control device; if yes, proceed to S65. S65. Determine the second control device, which is the nearest upstream device without any type III faults, and send a disconnect command to the second control device.

7. A fault monitoring and isolation system for medium and low voltage distribution network equipment, using the fault monitoring and isolation method for medium and low voltage distribution network equipment according to any one of claims 1-6, the system comprising: The main station server, the regional main station platform, and the terminal equipment are characterized by: The central station server is used for centralized monitoring of equipment and lines in the distribution network; the terminal equipment includes DTU, FTU, and FIU, which are used for on-site collection and analysis of distribution network data and on-site control; the regional central control platform is used for fault location analysis of target zones in the distribution network. The main station server includes a core terminal determination module and a target partitioning module; The partition control platform includes a strategy adjustment module and a fault isolation module; The DTU and FTU in the terminal device include edge computing modules.

8. The fault monitoring and isolation system for medium and low voltage distribution network equipment according to claim 7, characterized in that, The core terminal determination module is used to select a first core terminal and a second terminal from the terminal equipment in the distribution network; the first core terminal is a terminal equipment selected based on terminal utilization rate; the second terminal is other terminal equipment besides the first core terminal. The target partitioning module is used to calculate the distance from each second terminal to each first core terminal based on the location information of the terminal devices; and to assign the second terminals to the target partition where the nearest first core terminal is located, that is, to divide all terminal devices into several target partitions.

9. The fault monitoring and isolation system for medium and low voltage distribution network equipment according to claim 8, characterized in that, The strategy adjustment module is used to determine the fault type of the terminal equipment based on the fault code; and to adjust the fault location and isolation strategy of the distribution network in the target area based on the fault type.

10. The fault monitoring and isolation system for medium and low voltage distribution network equipment according to claim 9, characterized in that, The fault isolation module is used to determine the location of a fault in the power distribution network and to determine the associated switching equipment at the location of the fault.

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