A distribution network fault self-healing control method, system and distribution network terminal

Abstract

The present invention discloses a distribution network fault self-healing control method, system and distribution network terminal, which relate to the field of distribution network automatic control technology. The key points of its technical solution are: the self-healing control strategy in the present invention only includes the distribution area where power supply is restored and the fault location where power continues to be cut off, thereby improving the working efficiency of fault analysis; in addition, the distribution terminal analyzes the degree of correlation between the distribution area and the fault location based on the received self-healing control strategy, thereby determining whether the distribution area performs safety verification when power supply is restored, effectively improving the safety and reliability of the distribution network fault self-healing control; in addition, the distribution terminal combines the self-healing control strategy and the switch status information of the switching device in the first distribution area to generate the switch control instruction of the corresponding first distribution area, thereby meeting the dynamic changes of the self-healing control strategy caused by the safety verification, and reducing the complexity of the switch control instruction generation process.

Description

Technical Field

[0001] The present invention relates to the technical field of automatic control of distribution networks, and more particularly to a distribution network fault self-healing control method, system and distribution network terminal. Background Art

[0002] As distribution terminals continue to evolve toward automation, they leverage advanced communications, control, and computing technologies to enable power systems to automatically identify, locate, and isolate faults, as well as restore power supply. The self-healing capabilities of distribution automation terminals play a significant role in improving power supply reliability and user experience.

[0003] Currently, distribution self-healing technologies primarily utilize centralized control and decentralized control approaches. Centralized control primarily involves centralized control via a distribution master station (DMS). The DMS analyzes and processes faults based on data uploaded by distribution terminals, then issues control commands. However, distribution self-healing relies on a reliable communication system to transmit fault information and control commands. Problems such as communication network failures, signal interference, and communication delays can prevent timely and accurate transmission of fault information to the DMS. Precise fault location calculations often require data collection from multiple distribution terminals to account for fault propagation, making fault analysis at the DMS inefficient. Furthermore, after a fault occurs, the status of sectionalized switches in some distribution areas within the outage may not remain completely consistent, with some remaining open and others closed. Therefore, the DMS requires receiving switch status information uploaded by all distribution terminals to generate detailed self-healing control strategies, which can reduce the efficiency of distribution network self-healing control. Furthermore, if the DMS's fault analysis is biased due to incomplete data, executing self-healing control strategies at distribution terminals can easily trigger widespread secondary failures.

[0004] Therefore, how to research and design a distribution network fault self-healing control method, system and distribution network terminal that can overcome the above-mentioned defects is a problem that we urgently need to solve. Summary of the Invention

[0005] In order to address the deficiencies in the prior art, the purpose of the present invention is to provide a distribution network fault self-healing control method, system and distribution network terminal, which improves the work efficiency of the distribution master station in performing fault analysis, while effectively improving the safety and reliability of the distribution network fault self-healing control, and can meet the dynamic changes of the self-healing control strategy caused by safety verification, thereby reducing the complexity of the switch control instruction generation process.

[0006] The above technical objectives of the present invention are achieved through the following technical solutions:

[0007] In a first aspect, a distribution network fault self-healing control method is provided, comprising the following steps:

[0008] The power distribution terminal collects the operating information of the first equipment in the covered power distribution area and transmits it to the distribution network master station;

[0009] The distribution network master station performs a fault analysis on the received first device operation information, determines a self-healing control strategy, and transmits the strategy to the power distribution terminal;

[0010] The power distribution terminal analyzes the degree of correlation between the power distribution area and the fault location according to the received self-healing control strategy;

[0011] The power distribution terminal generates a switch control instruction for the first power distribution area by combining the self-healing control strategy and the switch status information of the switch device in the first power distribution area, and transmits the instruction to the switch device; the first power distribution area is the power distribution area for which the correlation degree is less than the correlation threshold;

[0012] The switch device responds to the switch control instruction to restore power supply to the first power distribution area;

[0013] The power distribution terminal collects the operating information of the second device in the first power distribution area where power supply has been restored, updates the self-healing control strategy according to the operating information of the second device, and updates the correlation degree when the operating information of the second device is within a normal range;

[0014] The power distribution terminal generates feedback information when the self-healing control strategy is executed or the correlation levels of all the power distribution areas are not less than the correlation threshold, and transmits the feedback information to the distribution network master station.

[0015] Furthermore, the analysis process of the correlation degree is specifically as follows:

[0016] Extracting a first boundary node group of the power distribution area and a second boundary node group of the fault location from the self-healing control strategy;

[0017] analyzing a minimum number of power distribution areas required to associate the first boundary node group with the second boundary node group;

[0018] The correlation degree of the power distribution areas is determined according to the minimum number of power distribution areas. The smaller the minimum number of power distribution areas is, the greater the correlation degree is.

[0019] Furthermore, the value range of the correlation degree is (0,1];

[0020] When the first boundary node group and the second boundary node group contain the same boundary node, the minimum number of power distribution areas is 0, and the association degree is 1;

[0021] And, when the minimum number of distribution areas is N, the association degree is the reciprocal of N+1.

[0022] Furthermore, the generation process of the switch control instruction is specifically as follows:

[0023] Determining the regional status of the adjacent distribution network area corresponding to each boundary node in the first power distribution area and the switching status of the switch device corresponding to each boundary node;

[0024] If the regional status is that the power distribution area is in a normal operating state or in a waiting-for-self-healing state with a correlation degree less than a correlation threshold, the status value of the regional status is defined as 1;

[0025] If the regional status is that the power distribution area is in a fault state or a pending state with a correlation degree not less than a correlation threshold, the state value of the regional status is defined as 0;

[0026] If the switch state is an off state, the state value of the switch state is defined as 0;

[0027] If the switch state is a closed state, the state value of the switch state is defined as 1;

[0028] The state value corresponding to the final switch state of the switching device is calculated by taking the product of the state value of the area state and the state value of the switch state, and the switch control instruction is determined according to the state value corresponding to the final switch state.

[0029] Furthermore, the correlation threshold is calculated based on the fault response delay time;

[0030] When the fault response delay time is the only independent variable, the longer the fault response delay time is, the smaller the associated threshold value is;

[0031] The fault response delay time is the time difference between the fault occurrence time and the operation time of the circuit breaker of the substation outgoing line.

[0032] Furthermore, the correlation threshold is determined according to the fault type;

[0033] When the fault type is the only independent variable, the greater the severity of the fault type, the smaller the associated threshold;

[0034] The severity of the fault type is determined by evaluating the impact of the fault type on the safety and stability of the distribution network operation, the degree of damage to the equipment, and the economic losses.

[0035] Furthermore, the process of updating the self-healing control strategy according to the second device operation information is specifically as follows:

[0036] If the second device operation information is within a normal range, marking the area status of the first power distribution area corresponding to the self-healing control strategy as a normal operating state;

[0037] If the second device operation information exceeds a normal range, the area status of the corresponding first power distribution area in the self-healing control strategy is marked as a fault state.

[0038] In the second aspect, a distribution network fault self-healing control system is provided, including a distribution network master station, a distribution terminal and a switchgear;

[0039] The power distribution terminal collects the first equipment operation information of the covered power distribution area and transmits it to the distribution network master station;

[0040] The distribution network master station performs a fault analysis on the received first device operation information, determines a self-healing control strategy, and transmits the strategy to the power distribution terminal;

[0041] The power distribution terminal analyzes the degree of correlation between the power distribution area and the fault location according to the received self-healing control strategy;

[0042] The power distribution terminal generates a switch control instruction for the first power distribution area by combining the self-healing control strategy and the switch status information of the switch device in the first power distribution area, and transmits the instruction to the switch device; the first power distribution area is the power distribution area for which the correlation degree is less than the correlation threshold;

[0043] The switch device responds to the switch control instruction to restore power supply to the first power distribution area;

[0044] The power distribution terminal collects the operating information of the second device in the first power distribution area where power supply has been restored, updates the self-healing control strategy according to the operating information of the second device, and updates the correlation degree when the operating information of the second device is within a normal range;

[0045] The power distribution terminal generates feedback information when the self-healing control strategy is executed or the correlation levels of all the power distribution areas are not less than the correlation threshold, and transmits the feedback information to the distribution network master station.

[0046] In a third aspect, a distribution network fault self-healing control method is provided, which is applied to a distribution network terminal and includes the following steps:

[0047] The distribution terminal collects the equipment operation information in the distribution area and transmits it to the distribution network master station;

[0048] Analyzing the degree of correlation between the power distribution area and the fault location based on the received self-healing control strategy; the self-healing control strategy is determined by the distribution network master station after performing a fault analysis on the received equipment operation information;

[0049] generating a switch control instruction for the first power distribution area by combining the self-healing control strategy and the switch status information of the switch device in the first power distribution area, and transmitting the instruction to the switch device; the first power distribution area is the power distribution area for which the correlation degree is less than the correlation threshold; the switch control instruction is used to control the operation of the switch device to restore power supply to the first power distribution area;

[0050] Collecting operating information of a second device in the first power distribution area where power supply has been restored, updating the self-healing control strategy according to the operating information of the second device, and updating the correlation level when the operating information of the second device is within a normal range;

[0051] When the self-healing control strategy is executed completely or the correlation levels of all the power distribution areas are not less than the correlation threshold, feedback information is generated and transmitted to the distribution network master station.

[0052] In a fourth aspect, a distribution network terminal is provided, comprising:

[0053] The information collection unit is used to collect the equipment operation information in the distribution area covered by the distribution network terminal and transmit it to the distribution network master station;

[0054] a correlation analysis unit, configured to analyze the degree of correlation between the power distribution area and the fault location based on the received self-healing control strategy; the self-healing control strategy is determined by the distribution network master station after performing a fault analysis on the received equipment operation information;

[0055] an instruction generating unit, configured to generate a switch control instruction for the first power distribution area by combining the self-healing control strategy and switch status information of the switch device in the first power distribution area, and transmit the instruction to the switch device; the first power distribution area is the power distribution area for which the degree of association is less than the association threshold; the switch control instruction is used to control the operation of the switch device to restore power supply to the first power distribution area;

[0056] an iterative updating unit, configured to collect operating information of a second device in the first power distribution area to which power supply has been restored, update the self-healing control strategy according to the operating information of the second device, and update the degree of association when the operating information of the second device is within a normal range;

[0057] An information feedback unit is used to generate feedback information when the self-healing control strategy is executed or the correlation degree of all the distribution areas is not less than the correlation threshold, and transmit the feedback information to the distribution network master station.

[0058] Compared with the prior art, the present invention has the following beneficial effects:

[0059] 1. A distribution network fault self-healing control method described in the present invention only requires that an abnormal distribution terminal upload the operating information of the first device in the covered distribution area. The distribution network master station performs a fault analysis on the received first device operating information and determines a self-healing control strategy that only includes the distribution area where power is restored and the fault location where power continues to be cut off, thereby improving the efficiency of the distribution master station in performing fault analysis. In addition, the distribution terminal analyzes the degree of correlation between the distribution area and the fault location based on the received self-healing control strategy to determine whether the distribution area should perform safety verification when power is restored, effectively improving the safety and reliability of the distribution network fault self-healing control. In addition, the distribution terminal combines the self-healing control strategy and the switch status information of the switch device in the first distribution area to generate a switch control instruction for the corresponding first distribution area, thereby meeting the dynamic changes of the self-healing control strategy caused by the safety verification and reducing the complexity of the switch control instruction generation process.

[0060] 2. The present invention defines the state value of the regional state switch state and calculates the state value corresponding to the final switch state of the switch device by the product of the state value of the regional state and the state value of the switch state. This can achieve consistency in the generation of switch control instructions when the sectional switches of various distribution areas in the power outage area are in different states after a fault occurs, and has strong adaptability.

[0061] 3. The present invention dynamically adjusts the associated threshold according to the fault response delay time and the severity of the fault type, and can flexibly adjust the scope of safety verification, thereby reducing the occurrence of unnecessary safety verification in some distribution areas. BRIEF DESCRIPTION OF THE DRAWINGS

[0062] The drawings described herein are used to provide a further understanding of the embodiments of the present invention, constitute a part of this application, and do not constitute a limitation of the embodiments of the present invention. In the drawings:

[0063] Figure 1 This is a flowchart of Example 1 of the present invention;

[0064] Figure 2 This is a schematic diagram of boundary node group association analysis in Example 1 of the present invention;

[0065] Figure 3 is a system block diagram in Example 2 of the present invention;

[0066] Figure 4 This is a flowchart of Example 3 of the present invention;

[0067] Figure 5 This is a functional block diagram of embodiment 4 of the present invention. DETAILED DESCRIPTION

[0068] In order to make the objectives, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with examples and drawings. The exemplary embodiments of the present invention and their descriptions are only used to explain the present invention and are not intended to limit the present invention.

[0069] Example 1: A distribution network fault self-healing control method, such as Figure 1 As shown, the following steps are included:

[0070] S1: The power distribution terminal collects the operating information of the first device in the covered power distribution area and transmits it to the distribution network master station;

[0071] S2: The distribution network master station performs a fault analysis on the received first device operation information, determines a self-healing control strategy, and transmits the strategy to the power distribution terminal;

[0072] S3: The distribution terminal analyzes the correlation between the distribution area and the fault location based on the received self-healing control strategy;

[0073] S4: The power distribution terminal generates a switch control instruction for the first power distribution area by combining the self-healing control strategy and the switch status information of the switch device in the first power distribution area, and transmits the instruction to the switch device; the first power distribution area is a power distribution area with a correlation degree less than the correlation threshold;

[0074] S5: The switch device responds to the switch control instruction to restore power supply to the first distribution area;

[0075] S6: The power distribution terminal collects the operating information of the second device in the first power distribution area where power supply has been restored, updates the self-healing control strategy based on the operating information of the second device, and updates the correlation level when the operating information of the second device is within a normal range;

[0076] S7: The distribution terminal generates feedback information when the self-healing control strategy is executed or the correlation degree of all distribution areas is not less than the correlation threshold, and transmits it to the distribution network master station.

[0077] In step S1 , the first device operation information may be one or more of electrical quantity information, fault indication information, protection action information, communication status information, and device status information.

[0078] Electrical quantity information includes but is not limited to voltage, current, power, power factor, frequency and harmonics; fault indication information includes but is not limited to fault current, zero-sequence current, zero-sequence voltage and fault indicator status; protection action information includes but is not limited to protection device action signal and event sequence record; communication status information includes but is not limited to communication status and data transmission quality; equipment status information includes but is not limited to equipment temperature, equipment operating time and equipment self-diagnosis information.

[0079] In this embodiment, the first device operation information is information collected by the distribution terminal after a fault occurs. Generally, after collecting this information, the distribution terminal performs an anomaly check and, if any anomaly is found, uploads the information to the distribution network master station. It should be noted that anomalies in the collected information merely indicate data fluctuations and do not indicate a fault in the equipment in the distribution area. This is because after a fault occurs, information can spread, such as current. Some distribution areas may only experience data fluctuations without experiencing a fault.

[0080] In addition, the distribution terminals in this invention are divided into feeder terminals and station terminals. A distribution terminal generally covers two or more distribution areas, but some feeder distribution terminals only cover one distribution area. Feeder distribution terminals are generally installed at the pole-mounted switch of the distribution network feeder loop.

[0081] In step S2, the distribution master station only needs to receive the operating information of the first device with an abnormality to perform fault analysis, and the self-healing control strategy determined by the fault analysis only includes the distribution area where power supply is restored and the fault location where power continues to be cut off, which can improve the work efficiency of the distribution master station in performing fault analysis.

[0082] In step S3, considering that the communication efficiency and stability between each distribution terminal and the distribution master station are not completely consistent, within a limited time, the information of some distribution terminals can be transmitted to the distribution master station; while the information of some distribution terminals cannot be transmitted to the distribution master station. When automatically generating a self-healing control strategy, the distribution master station will assume that there is no abnormality in the information collected by this part of the distribution terminals. Therefore, the information collected by this part of the distribution terminals will affect the accuracy and reliability of the self-healing control strategy generated by the distribution master station. For example, the fault area determined in the self-healing control strategy is smaller than the actual fault area. In this way, when the power supply of the controlled distribution area (actually in the fault range) is restored, a secondary fault will be caused. In serious cases, it will cause a large-scale power outage.

[0083] To this end, when the power distribution terminal receives the self-healing control strategy and performs the power outage recovery operation, the present invention converts the existing synchronous recovery into a dynamic hierarchical recovery in a convergent form toward the fault center, and determines the recovery range of the next level based on the recovery result of the previous level.

[0084] However, considering that the scope of the associated faults caused by the spread of general faults is not particularly large, applying dynamic hierarchical recovery to all faults will lead to a decrease in the overall efficiency of the distribution network fault self-healing control. Therefore, the present invention flexibly selects dynamic hierarchical recovery based on actual conditions, and uses the degree of correlation to select the range.

[0085] In this embodiment, the analysis process of the degree of association is specifically as follows: extracting the first boundary node group of the distribution area and the second boundary node group of the fault location from the self-healing control strategy; analyzing the minimum number of distribution areas required to associate the first boundary node group with the second boundary node group; determining the degree of association of the distribution areas based on the minimum number of distribution areas, the smaller the minimum number of distribution areas, the greater the degree of association.

[0086] like Figure 2 As shown in the figure, each AR represents a switchgear. Assume that the second boundary node group at the fault location is (D, H, O), the first boundary node groups at the four distribution areas are (A, B, C), (C, D, E), (E, F), and (F, G), and the second boundary node group at the fault location is (D, H, O). The minimum number of distribution areas required to associate the four first boundary node groups with the second boundary node group is 1, 0, 1, and 2, respectively. Each boundary node group represents a distribution area.

[0087] As an optional implementation, the correlation degree ranges from (0, 1], and the correlation degree is calculated as follows: when the minimum number of distribution areas is N, the correlation degree is the reciprocal of N+1. It can be seen that when the first boundary node group and the second boundary node group have the same boundary nodes, the minimum number of distribution areas is 0 and the correlation degree is 1.

[0088] In step S4, in order to adapt to the different switching states of switch devices corresponding to different distribution areas and the dynamic control of the switch state during dynamic hierarchical recovery, the present invention flexibly defines the state value of the regional state by combining the location of the distribution area and the correlation analysis results, and generates a switch control instruction in combination with the state value of the switch state.

[0089] The specific process of generating the switch control instruction is as follows: determining the regional status of the adjacent distribution network area corresponding to each boundary node in the first distribution area and the switch status of the switch device corresponding to each boundary node; if the regional status is that the distribution area is in normal operation or in a state to be self-healed with a correlation degree less than the correlation threshold, the state value of the regional status is defined as 1; if the regional status is that the distribution area is in a fault state or in a state to be inspected with a correlation degree not less than the correlation threshold, the state value of the regional status is defined as 0; if the switch state is in an open state, the state value of the switch state is defined as 0; if the switch state is in a closed state, the state value of the switch state is defined as 1.

[0090] When the above state value is determined, the state value corresponding to the final switch state of the switching device is calculated by the product of the state value of the area state and the state value of the switch state, and the switch control instruction is determined according to the state value corresponding to the final switch state.

[0091] The present invention defines the regional status switch status value, and calculates the status value corresponding to the final switch state of the switching device by the product of the regional status value and the switch status value. It can achieve consistency in the generation of switch control instructions when the segmented switches in each distribution area in the power outage area are in different states after a fault occurs, and has strong adaptability.

[0092] As an optional implementation, the associated threshold is calculated based on the fault response delay time; when the fault response delay time is the only independent variable, the longer the fault response delay time, the smaller the associated threshold; wherein the fault response delay time is the time difference between the fault occurrence time and the operation time of the circuit breaker of the substation outgoing line.

[0093] As another optional implementation, the association threshold can also be determined based on the fault type; when the fault type is the only independent variable, the greater the severity of the fault type, the smaller the association threshold; wherein the severity of the fault type is obtained by evaluating the impact of the fault type on the safety and stability of the distribution network operation, the degree of damage to the equipment, and the economic losses.

[0094] It should be noted that the correlation threshold may also be a fixed threshold, or may be calculated based on the fault type and the fault response delay time.

[0095] The present invention dynamically adjusts the associated threshold according to the fault response delay time and the severity of the fault type, can flexibly adjust the scope of safety verification, and reduces the occurrence of unnecessary safety verification in some distribution areas.

[0096] In step S5 , the switchgear may be a circuit breaker, a section switch, or an isolator.

[0097] In step S6, the process of updating the self-healing control strategy based on the second device operation information is specifically as follows: if the second device operation information is within the normal range, the regional status of the corresponding first distribution area in the self-healing control strategy is marked as a normal operating state; if the second device operation information exceeds the normal range, the regional status of the corresponding first distribution area in the self-healing control strategy is marked as a fault state.

[0098] In step S7, the feedback information is transmitted to the distribution network master station, which can provide timely feedback on the self-healing status to facilitate maintenance of the faulty area.

[0099] Example 2: A distribution network fault self-healing control system, which is used to implement a distribution network fault self-healing control method as described in Example 1. Figure 3 As shown, it includes distribution network master station, distribution terminal and switchgear.

[0100] The distribution terminal collects first equipment operating information of the covered distribution area and transmits it to the distribution network master station; the distribution network master station performs fault analysis on the received first equipment operating information, determines a self-healing control strategy, and transmits it to the distribution terminal; the distribution terminal analyzes the degree of correlation between the distribution area and the fault location based on the received self-healing control strategy; the distribution terminal generates a switching control instruction for the first distribution area based on the self-healing control strategy and the switching status information of the switching device in the first distribution area, and transmits it to the switching device; the first distribution area is a distribution area with a correlation degree less than a correlation threshold; the switching device responds to the switching control instruction to restore power to the first distribution area; the distribution terminal collects second equipment operating information of the first distribution area where power supply has been restored, and updates the self-healing control strategy based on the second equipment operating information, and updates the correlation degree when the second equipment operating information is within a normal range; the distribution terminal generates feedback information when the self-healing control strategy is executed or the correlation degrees of all distribution areas are not less than the correlation threshold, and transmits it to the distribution network master station.

[0101] Example 3: A distribution network fault self-healing control method, which is applied to the distribution network terminal as described in Example 1, such as Figure 4 As shown, the following steps are included:

[0102] A1: The distribution terminal collects equipment operation information in the distribution area and transmits it to the distribution network master station;

[0103] A2: Analyze the correlation between the distribution area and the fault location based on the received self-healing control strategy. The self-healing control strategy is determined by the distribution network master station after performing a fault analysis on the received equipment operation information.

[0104] A3: A switching control instruction for the first distribution area is generated by combining the self-healing control strategy and the switching status information of the switchgear in the first distribution area, and transmitted to the switchgear. The first distribution area is a distribution area with a correlation degree less than the correlation threshold. The switching control instruction is used to control the operation of the switchgear to restore power supply to the first distribution area.

[0105] A4: Collecting the operating information of the second device in the first distribution area where power supply has been restored, updating the self-healing control strategy based on the operating information of the second device, and updating the correlation level when the operating information of the second device is within the normal range;

[0106] A5: When the self-healing control strategy is executed or the correlation degree of all distribution areas is not less than the correlation threshold, feedback information is generated and transmitted to the distribution network master station.

[0107] Example 4: A distribution network terminal, such as Figure 5 As shown, it includes an information collection unit, an association analysis unit, an instruction generation unit, an iterative update unit and an information feedback unit.

[0108] Among them, the information collection unit is used to collect equipment operation information in the distribution area covered by the distribution network terminal and transmit it to the distribution network master station; the correlation analysis unit is used to analyze the degree of correlation between the distribution area and the fault location based on the received self-healing control strategy; the self-healing control strategy is determined by the distribution network master station after fault analysis of the received equipment operation information; the instruction generation unit is used to combine the self-healing control strategy and the switching status information of the switching device in the first distribution area to generate a switching control instruction for the first distribution area and transmit it to the switching device; the first distribution area is a distribution area with a correlation degree less than the correlation threshold; the switching control instruction is used to control the operation of the switching device to restore power to the first distribution area; the iterative update unit is used to collect the second equipment operation information of the first distribution area where power supply has been restored, and update the self-healing control strategy based on the second equipment operation information, and update the correlation degree when the second equipment operation information is within the normal range; the information feedback unit is used to generate feedback information when the self-healing control strategy is executed or the correlation degree of all distribution areas is not less than the correlation threshold, and transmit it to the distribution network master station.

[0109] It should be noted that the distribution network terminal described in this embodiment has all the functions of the power distribution terminal described in Example 1.

[0110] Working principle: The present invention only requires that the distribution terminal with an abnormality upload the first equipment operation information of the covered distribution area. The distribution network master station performs a fault analysis on the received first equipment operation information and determines a self-healing control strategy that only includes the distribution area where power supply is restored and the fault location where power continues to be cut off, thereby improving the work efficiency of the distribution master station in performing fault analysis; in addition, the distribution terminal analyzes the degree of correlation between the distribution area and the fault location based on the received self-healing control strategy, thereby determining whether the distribution area performs safety verification when power supply is restored, effectively improving the safety and reliability of the distribution network fault self-healing control; in addition, the distribution terminal combines the self-healing control strategy and the switch status information of the switching device in the first distribution area to generate the switch control instruction corresponding to the first distribution area, thereby meeting the dynamic changes of the self-healing control strategy caused by the safety verification, and reducing the complexity of the switch control instruction generation process.

[0111] Those skilled in the art will appreciate that the embodiments of the present application may be provided as methods, systems, or computer program products. Therefore, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment, or an embodiment combining software and hardware. Furthermore, the present application may take the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to magnetic disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0112] The present application is described with reference to the flowcharts and / or block diagrams of the methods, devices (systems), and computer program products according to the embodiments of the present application. It should be understood that each process and / or block in the flowchart and / or block diagram, as well as the combination of processes and / or blocks in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing device to produce a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the processes in the flowchart and / or block diagram. Figure 1 a process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0113] These computer program instructions may also be stored in a computer readable memory that can direct a computer or other programmable data processing device to work in a specific manner, so that the instructions stored in the computer readable memory produce an article of manufacture comprising an instruction device, which implements the process Figure 1 a process or multiple processes and / or boxes Figure 1 The function specified in one or more boxes.

[0114] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operational steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing the instructions executed on the computer or other programmable device for implementing the process. Figure 1 a process or multiple processes and / or boxes Figure 1 A step that specifies a function in one or more boxes.

[0115] The specific implementation methods described above further illustrate the objectives, technical solutions and beneficial effects of the present invention in detail. It should be understood that the above description is only a specific implementation method of the present invention and is not intended to limit the scope of protection of the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A distribution network fault self-healing control method, characterized in that: The following steps are involved: The power distribution terminal collects the operating information of the first equipment in the covered power distribution area and transmits it to the distribution network master station; The distribution network master station performs a fault analysis on the received first device operation information, determines a self-healing control strategy, and transmits the strategy to the power distribution terminal; The power distribution terminal analyzes the degree of correlation between the power distribution area and the fault location according to the received self-healing control strategy; The power distribution terminal generates a switch control instruction for the first power distribution area by combining the self-healing control strategy and the switch status information of the switch device in the first power distribution area, and transmits the instruction to the switch device; the first power distribution area is the power distribution area for which the correlation degree is less than the correlation threshold; The switch device responds to the switch control instruction to restore power supply to the first power distribution area; The power distribution terminal collects the operating information of the second device in the first power distribution area where power supply has been restored, updates the self-healing control strategy according to the operating information of the second device, and updates the correlation degree when the operating information of the second device is within a normal range; The power distribution terminal generates feedback information when the self-healing control strategy is executed or the correlation degree of all the power distribution areas is not less than the correlation threshold, and transmits the feedback information to the distribution network master station; The analysis process of the degree of association is specifically as follows: Extracting a first boundary node group of the power distribution area and a second boundary node group of the fault location from the self-healing control strategy; analyzing a minimum number of power distribution areas required to associate the first boundary node group with the second boundary node group; determining the degree of association of the power distribution areas according to the minimum number of power distribution areas, wherein the smaller the minimum number of power distribution areas, the greater the degree of association; The value range of the correlation degree is (0,1]; When the first boundary node group and the second boundary node group contain the same boundary node, the minimum number of power distribution areas is 0, and the association degree is 1; And, when the minimum number of power distribution areas is N, the association degree is the reciprocal of N+1; The generation process of the switch control instruction is specifically as follows: Determining the regional status of the adjacent distribution network area corresponding to each boundary node in the first power distribution area and the switching status of the switch device corresponding to each boundary node; If the regional status is that the power distribution area is in a normal operating state or in a waiting-for-self-healing state with a correlation degree less than a correlation threshold, the status value of the regional status is defined as 1; If the regional status is that the power distribution area is in a fault state or a pending state with a correlation degree not less than a correlation threshold, the state value of the regional status is defined as 0; If the switch state is an off state, the state value of the switch state is defined as 0; If the switch state is a closed state, the state value of the switch state is defined as 1; The state value corresponding to the final switch state of the switching device is calculated by taking the product of the state value of the area state and the state value of the switch state, and the switch control instruction is determined according to the state value corresponding to the final switch state.

2. A distribution network fault self-healing control method according to claim 1, characterized in that: The correlation threshold is calculated based on the fault response delay time; When the fault response delay time is the only independent variable, the longer the fault response delay time is, the smaller the associated threshold value is; The fault response delay time is the time difference between the fault occurrence time and the operation time of the circuit breaker of the substation outgoing line.

3. A distribution network fault self-healing control method according to claim 1, characterized in that: The associated threshold is determined according to the fault type; When the fault type is the only independent variable, the greater the severity of the fault type, the smaller the associated threshold; The severity of the fault type is determined by evaluating the impact of the fault type on the safety and stability of the distribution network operation, the degree of damage to the equipment, and the economic losses.

4. A distribution network fault self-healing control method according to claim 1, characterized in that: The process of updating the self-healing control strategy according to the second device operation information is specifically as follows: If the second device operation information is within a normal range, marking the area status of the first power distribution area corresponding to the self-healing control strategy as a normal operating state; If the second device operation information exceeds a normal range, the area status of the corresponding first power distribution area in the self-healing control strategy is marked as a fault state.

5. A distribution network fault self-healing control system, characterized in that: The system is used to implement a distribution network fault self-healing control method as described in any one of claims 1 to 4, comprising a distribution network master station, a distribution terminal and a switch device; The power distribution terminal collects the first equipment operation information of the covered power distribution area and transmits it to the distribution network master station; The distribution network master station performs a fault analysis on the received first device operation information, determines a self-healing control strategy, and transmits the strategy to the power distribution terminal; The power distribution terminal analyzes the degree of correlation between the power distribution area and the fault location according to the received self-healing control strategy; The power distribution terminal generates a switch control instruction for the first power distribution area by combining the self-healing control strategy and the switch status information of the switch device in the first power distribution area, and transmits the instruction to the switch device; the first power distribution area is the power distribution area for which the correlation degree is less than the correlation threshold; The switch device responds to the switch control instruction to restore power supply to the first power distribution area; The power distribution terminal collects the operating information of the second device in the first power distribution area where power supply has been restored, updates the self-healing control strategy according to the operating information of the second device, and updates the correlation degree when the operating information of the second device is within a normal range; The power distribution terminal generates feedback information when the self-healing control strategy is executed or the correlation levels of all the power distribution areas are not less than the correlation threshold, and transmits the feedback information to the distribution network master station.

6. A distribution network fault self-healing control method, characterized in that: The method is applied to a distribution network terminal and includes the following steps: The distribution terminal collects the equipment operation information in the distribution area and transmits it to the distribution network master station; Analyzing the degree of correlation between the power distribution area and the fault location based on the received self-healing control strategy; the self-healing control strategy is determined by the distribution network master station after performing a fault analysis on the received equipment operation information; generating a switch control instruction for the first power distribution area by combining the self-healing control strategy and the switch status information of the switch device in the first power distribution area, and transmitting the instruction to the switch device; the first power distribution area is the power distribution area for which the correlation degree is less than the correlation threshold; the switch control instruction is used to control the operation of the switch device to restore power supply to the first power distribution area; Collecting operating information of a second device in the first power distribution area where power supply has been restored, updating the self-healing control strategy according to the operating information of the second device, and updating the correlation level when the operating information of the second device is within a normal range; When the self-healing control strategy is executed or the correlation levels of all the power distribution areas are not less than the correlation threshold, feedback information is generated and transmitted to the distribution network master station; The analysis process of the degree of association is specifically as follows: Extracting a first boundary node group of the power distribution area and a second boundary node group of the fault location from the self-healing control strategy; analyzing a minimum number of power distribution areas required to associate the first boundary node group with the second boundary node group; determining the degree of association of the power distribution areas according to the minimum number of power distribution areas, wherein the smaller the minimum number of power distribution areas, the greater the degree of association; The value range of the correlation degree is (0,1]; When the first boundary node group and the second boundary node group contain the same boundary node, the minimum number of power distribution areas is 0, and the association degree is 1; And, when the minimum number of power distribution areas is N, the association degree is the reciprocal of N+1; The generation process of the switch control instruction is specifically as follows: Determining the regional status of the adjacent distribution network area corresponding to each boundary node in the first power distribution area and the switching status of the switch device corresponding to each boundary node; If the regional status is that the power distribution area is in a normal operating state or in a waiting-for-self-healing state with a correlation degree less than a correlation threshold, the status value of the regional status is defined as 1; If the regional status is that the power distribution area is in a fault state or a pending state with a correlation degree not less than a correlation threshold, the state value of the regional status is defined as 0; If the switch state is an off state, the state value of the switch state is defined as 0; If the switch state is a closed state, the state value of the switch state is defined as 1; The state value corresponding to the final switch state of the switching device is calculated by taking the product of the state value of the area state and the state value of the switch state, and the switch control instruction is determined according to the state value corresponding to the final switch state.

7. A distribution network terminal, characterized in that: The distribution network terminal is used to implement a distribution network fault self-recovery control method as claimed in claim 6, comprising: The information collection unit is used to collect the equipment operation information in the distribution area covered by the distribution network terminal and transmit it to the distribution network master station; a correlation analysis unit, configured to analyze the degree of correlation between the power distribution area and the fault location based on the received self-healing control strategy; the self-healing control strategy is determined by the distribution network master station after performing a fault analysis on the received equipment operation information; an instruction generating unit, configured to generate a switch control instruction for the first power distribution area by combining the self-healing control strategy and switch status information of the switch device in the first power distribution area, and transmit the instruction to the switch device; the first power distribution area is the power distribution area for which the degree of association is less than the association threshold; the switch control instruction is used to control the operation of the switch device to restore power supply to the first power distribution area; an iterative updating unit, configured to collect operating information of a second device in the first power distribution area to which power supply has been restored, update the self-healing control strategy according to the operating information of the second device, and update the degree of association when the operating information of the second device is within a normal range; An information feedback unit is used to generate feedback information when the self-healing control strategy is executed or the correlation degree of all the distribution areas is not less than the correlation threshold, and transmit the feedback information to the distribution network master station.

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