A load shedding self-healing power restoration method, system, device and medium

Abstract

The invention relates to the technical field of electric power systems, and discloses a load shedding self-healing and power restoration method, system, equipment and medium. The method determines the power restoration switch and the isolating switch through the electrical topological connection relationship of the distribution network and the opening and closing states of each automatic switch, thereby determining the area to be restored, and judging whether the area to be restored causes the overload of the outgoing line switch of the opposite line, and determining the load shedding demand according to the overload condition of the outgoing line switch of the opposite line, and determining the automatic switch that meets the load shedding demand as the load shedding switch through the load shedding priority mode, and performing the load shedding self-healing and power restoration operation through the load shedding switch, the power restoration switch and the isolating switch, thereby avoiding the overload of the outgoing line switch of the opposite line caused by the load in the area to be restored, and realizing the load transfer of all non-fault areas to the opposite line for load shedding and self-healing power restoration operation, and realizing the restoration of power supply to the non-fault area of ​​the distribution line to the greatest extent through the load shedding and power transfer mode, thereby improving the power supply reliability of the distribution network.

Description

Technical Field

[0001] The present invention relates to the technical field of power systems, and in particular to a load shedding self-healing power restoration method, system, equipment and medium. Background Art

[0002] In recent years, distribution self-healing technology has developed rapidly and has been widely used in distribution network fault transfer and power restoration scenarios. However, most distribution self-healing technologies currently only transfer all loads to the non-fault area of ​​the faulty line. However, in cases where the load to be transferred to the faulty line is heavy or the load on the opposite line is heavy, the self-healing program generally only takes a locked and immobile approach. Figure 1 As shown, under normal circumstances, when a fault occurs on the line between the outgoing switch CB1 and the automatic switch K1, the outgoing switch CB1 will trip for protection, and the self-healing program will disconnect the switch K1 to isolate the fault area. Then, according to the specific load situation, one of the contact switches L4, L5, and L6 will be closed to restore the load power supply to the non-fault area. However, in special circumstances, such as when the load in the non-fault area is heavy, and the original load of the outgoing switches CB2, CB3, and CB4 is also large or the load capacity is insufficient, the self-healing can only choose not to act or lock to avoid overload after the self-healing transfer, causing secondary faults and expanding the scope of power outage. Therefore, the current distribution self-healing program is difficult to directly transfer all the loads in the non-fault area to the opposite line because the load in the area to be restored by the fault line is too heavy, or the original load of the line on the opposite side of the fault line is too heavy, resulting in the self-healing program being locked, which has a great impact on the power supply reliability of this power supply area. Summary of the invention

[0003] In view of this, the present invention provides a load shedding self-healing and power restoration method, system, equipment and medium, which solves the technical problem that the current power distribution self-healing program is blocked because the load in the area to be restored of the fault line is too heavy, or the original load of the line on the opposite side of the fault line is too heavy, and the self-healing program is difficult to directly transfer all the loads in the non-fault area to the opposite line, which has a great impact on the power supply reliability of the power supply area.

[0004] A first aspect of the present invention provides a load shedding self-healing power restoration method, comprising:

[0005] In response to a request for self-healing power restoration of a line fault in a distribution network, a power restoration area to be restored is determined according to the electrical topological connection relationship of the distribution network and the opening and closing status of each automatic switch; the power restoration area to be restored includes a power restoration switch and an isolating switch;

[0006] Determining whether the outgoing line switch of the opposite line is overloaded according to the load of the area to be restored and the load of the outgoing line switch of the opposite line;

[0007] When it is determined that the outgoing line switch of the opposite line is overloaded, the load reduction requirement is determined according to the overload condition of the outgoing line switch of the opposite line;

[0008] According to a preset load shedding priority mode, an automatic switch that meets the load shedding demand is determined as a load shedding switch, and the load shedding switch is used to perform a load shedding operation on the load of the outgoing switch of the opposite line. The preset load shedding priority mode includes a branch line load shedding priority mode, a trunk line load shedding priority mode, and a branch-trunk mixed load shedding mode;

[0009] The load shedding and self-healing power restoration operation is performed through the load shedding switch, the power restoration switch and the isolating switch.

[0010] Preferably, determining the area to be restored to power according to the electrical topological connection relationship of the distribution network and the opening and closing status of each automatic switch includes:

[0011] When a line fault occurs in the distribution network, a fault cut-off switch is determined according to the electrical topological connection relationship of the distribution network, and the fault current signal is cut off by the fault cut-off switch; wherein the fault cut-off switch is an outgoing line switch which is closest to the fault location and receives the fault current signal;

[0012] According to the electrical topological connection relationship of the distribution network, a connection line between the fault cut-off switch and an automatic switch downstream of the fault cut-off switch that has not received the fault current signal and is closest to the fault cut-off switch in electrical distance is used as a line fault section line;

[0013] According to the opening and closing states of all automatic switches electrically connected to the line in the fault section of the line and the electrical topological connection relationship, the power restoration switch and the isolating switch are determined, and the area formed between the isolating switch and the power restoration switch that are directly electrically topologically connected is determined as the area to be restored.

[0014] Preferably, the step of determining the power restoration switch and the isolation switch according to the on / off states of all automatic switches electrically connected to the line in the line fault section and the electrical topological connection relationship comprises:

[0015] According to the electrical topological connection relationship of the distribution network, determine the automatic switch that is electrically connected to the line in the fault section of the line and connected to the tie switch or the original power supply bus as a candidate isolating switch;

[0016] According to the open and closed states of the candidate disconnectors, the candidate disconnectors in the closed state are used as disconnectors;

[0017] All automatic switches on the connection lines between the isolating switch and the opposite power supply bus and the original power supply bus are used as candidate power restoration switches;

[0018] According to the on / off state of the candidate power restoration switch, the candidate power restoration switch in the separated state is used as the power restoration switch.

[0019] Preferably, judging whether the outgoing line switch of the opposite line is overloaded according to the load of the area to be restored and the load of the outgoing line switch of the opposite line includes:

[0020] Determine the restoration load current of the area to be restored based on the load current of all disconnectors in the area to be restored and the load current of the outgoing line switch of the opposite line before the fault;

[0021] Determine whether the restored load current of the area to be restored is greater than a preset rated current of the opposite line;

[0022] When it is determined that the restored load current of the area to be restored is greater than the preset rated current of the opposite line, it is determined that the outgoing line switch of the opposite line is overloaded;

[0023] When it is determined that the restored load current of the area to be restored is not greater than the preset rated current of the opposite line, it is determined that the outgoing line switch of the opposite line is not overloaded.

[0024] Preferably, the preset load shedding priority mode is a branch line load shedding priority mode;

[0025] The step of determining an automatic switch that meets the load shedding demand as a load shedding switch according to a preset load shedding priority mode includes:

[0026] According to the electrical topological connection relationship of the distribution network, the line from the isolating switch to the selected transfer switch is used as the trunk line, and all the automatic switches on the trunk line are used as trunk switches;

[0027] According to the multiple branches drawn out from the trunk line, multiple branch line switches closest to the trunk line switch are determined as backup load shedding switches, and the backup load shedding switches are not tie switches;

[0028] Determine whether the sum of the load currents of the plurality of standby load shedding switches is greater than the load current of the selected transfer and connection switch;

[0029] When it is determined that the sum of the load currents of the plurality of standby load shedding switches is greater than the load current of the selected transfer and supply connection switch, the plurality of standby load shedding switches in the waiting power restoration area are arranged according to a preset load shedding priority;

[0030] For each branch line, determine whether the load current of the standby load shedding switch in the branch line is greater than or equal to the load shedding demand according to the sorting results, and obtain the first standby load shedding switch that meets the condition of being greater than or equal to the load shedding demand as the load shedding switch of the branch line, and use the load shedding switches of all branches as load shedding switches.

[0031] Preferably, the preset load shedding priority mode is a trunk line load shedding priority mode;

[0032] The step of determining an automatic switch that meets the load shedding demand as a load shedding switch according to a preset load shedding priority mode includes:

[0033] Use multiple automatic switches on the line between the isolating switch in the area to be restored to power and the selected transfer switch as the main line alternative load shedding switches;

[0034] Sorting the plurality of the trunk candidate load shedding switches from near to far from the original power supply, and taking the difference between the trunk candidate load shedding switch and the next adjacent trunk candidate load shedding switch as the first load shedding amount of the trunk candidate load shedding switch according to the sorting result, and marking the trunk candidate load shedding switch;

[0035] Determining whether the first load reduction amount is greater than the load reduction requirement;

[0036] If it is determined that the first load shedding amount is greater than the load shedding requirement, the trunk line alternative load shedding switch is used as the load shedding switch;

[0037] If it is determined that the first load shedding amount is not greater than the load shedding demand, the difference between the unmarked trunk candidate load shedding switch and the next adjacent trunk candidate load shedding switch is used as the second load shedding amount of the trunk candidate load shedding switch according to the sorting result, and the unmarked trunk candidate load shedding switch is marked;

[0038] Determining whether the sum of the first load reduction amount and the second load reduction amount is greater than the load reduction requirement;

[0039] If it is determined that the sum of the first load reduction amount and the second load reduction amount is greater than the load reduction requirement, the marked main line alternative load reduction switch is used as the load reduction switch;

[0040] If it is determined that the sum of the first load-reducing amount and the second load-reducing amount is not greater than the load-reduction requirement, continue to traverse the unmarked main line alternative load-reduction switches according to the sorting results until the sum of the load-reduction amounts of the marked main line alternative load-reduction switches is greater than the load-reduction requirement, and use the marked main line alternative load-reduction switches as load-reduction switches.

[0041] Preferably, the preset load shedding priority mode is a branch-trunk mixed load shedding mode;

[0042] The step of determining an automatic switch that meets the load shedding demand as a load shedding switch according to a preset load shedding priority mode includes:

[0043] A tree structure is constructed by taking the selected transfer contact switch as the root node, the line from the selected transfer contact switch to the isolating switch in the area to be restored as the trunk, and the automatic switches on all branch lines as the branch nodes of the trunk;

[0044] Sorting the branch switches on the tree structure according to the load shedding priority, and using the branch switches as standby load shedding switches;

[0045] Determine whether the load current of any of the standby load shedding switches before the failure is greater than or equal to the load shedding demand according to the sorting result;

[0046] If it is determined that the load current of any of the standby load shedding switches before the fault is greater than or equal to the load shedding demand, the standby load shedding switch may be listed as a branch line load shedding switch;

[0047] If it is determined that the load current of any one of the standby load shedding switches before the fault is less than the load shedding demand, continue looking for other standby load shedding switches on different branches, and determine whether the load current of other standby load shedding switches on different branches before the fault is greater than or equal to the load shedding demand, until the load current of the standby load shedding switch before the fault is greater than or equal to the load shedding demand, and obtain the branch line load shedding switch.

[0048] In a second aspect, the present invention further provides a load shedding self-healing power restoration system, comprising:

[0049] A module for determining a waiting power restoration area, for responding to a line fault self-healing power restoration request of a distribution network, and determining a waiting power restoration area according to an electrical topological connection relationship of the distribution network and an opening and closing state of each automatic switch; the waiting power restoration area includes a power restoration switch and an isolating switch;

[0050] An overload judgment module, used for judging whether the outgoing line switch of the opposite line is overloaded according to the load of the area to be restored and the load of the outgoing line switch of the opposite line;

[0051] A load shedding requirement module, configured to determine a load shedding requirement according to the overload condition of the outgoing line switch of the opposite line when it is determined that the outgoing line switch of the opposite line is overloaded;

[0052] A load shedding switch determination module, used to determine an automated switch that meets the load shedding demand as a load shedding switch according to a preset load shedding priority mode, wherein the load shedding switch is used to perform a load shedding operation on the load of the outgoing switch of the opposite line, and the preset load shedding priority mode includes a branch line load shedding priority mode, a trunk line load shedding priority mode, and a branch-trunk mixed load shedding mode;

[0053] The load shedding self-healing and power restoration module is used to perform load shedding self-healing and power restoration operations through the load shedding switch, the power restoration switch and the isolation switch.

[0054] In a third aspect, the present invention further provides an electronic device, comprising a memory and a processor, wherein the memory stores a computer program, and when the computer program is executed by the processor, the processor executes the steps of the load reduction self-healing power restoration method as described in the first aspect.

[0055] In a fourth aspect, the present invention further provides a computer-readable storage medium having a computer program stored thereon, which, when executed, implements the steps of the load shedding self-healing power restoration method as described in the first aspect.

[0056] It can be seen from the above technical scheme that the present invention determines the power restoration switch and the isolating switch through the electrical topological connection relationship of the distribution network and the opening and closing status of each automatic switch, thereby determining the area to be restored, and judging whether the area to be restored causes the outgoing line switch of the opposite line to be overloaded, and determining the load reduction demand according to the overload condition of the outgoing line switch of the opposite line, and determining the automatic switch that meets the load reduction demand as the load reduction switch through the load reduction priority method, and performing load reduction and self-healing and power restoration operations through the load reduction switch, the power restoration switch and the isolating switch, thereby avoiding the overload of the outgoing line switch of the opposite line caused by the load in the area to be restored, and realizing the transfer of all non-fault area loads to the opposite line for load reduction and self-healing and power restoration operations, and realizing the maximum restoration of power supply to the non-fault area of ​​the distribution line through the load reduction and transfer method, thereby improving the power supply reliability of the distribution network. BRIEF DESCRIPTION OF THE DRAWINGS

[0057] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0058] Figure 1 This is a schematic diagram of the self-healing power transfer line in the fault area of ​​the distribution network;

[0059] Figure 2 An application environment of a load shedding self-healing power restoration method provided by an embodiment of the present invention;

[0060] Figure 3 A flow chart of a load shedding self-healing power restoration method provided by an embodiment of the present invention;

[0061] Figure 4 It is a tree structure diagram of the main and branch line mixed load shedding topology;

[0062] Figure 5 It is a structural schematic diagram of a load shedding self-healing power restoration system;

[0063] Figure 6 The figure is a schematic diagram of the structure of an electronic device. DETAILED DESCRIPTION

[0064] In order to enable those skilled in the art to better understand the scheme of the present invention, the technical scheme in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0065] The load shedding self-healing power restoration method provided in the embodiment of the present application can be applied to Figure 2 In the application environment shown. Among them, the nodes of the distribution network communicate with the server 102 through the network. The data storage system can store the data that the server 102 needs to process. The data storage system can be integrated on the server 102, or it can be placed on the cloud or other network servers. The server 102 can be an independent physical server, or a server cluster or distributed system composed of multiple physical servers, or a cloud server that provides cloud computing services.

[0066] like Figure 3 As shown, the embodiment of the present application provides a load shedding self-healing power restoration method, which is applied to Figure 2 The server 102 in the example is used as an example to illustrate the method, which includes the following steps S1 to S5. Among them:

[0067] Step S1, in response to a line fault self-healing restoration request of the distribution network, determine a power restoration area to be restored according to the electrical topology connection relationship of the distribution network and the opening and closing status of each automatic switch; the power restoration area to be restored includes a power restoration switch and an isolating switch.

[0068] When a line failure occurs in the distribution network, a request for self-healing and power restoration of the line failure will be generated, and the electrical topology connection relationship of the distribution network and the opening and closing status of each automation switch will be obtained through the automation master station system.

[0069] In actual applications, by setting the protection trip start time setting value and protection current setting value of each automatic switch, the protection alarm and protection trip function of the automatic switch are activated, and the automatic switch is selectively activated to activate the protection alarm or activate the protection trip function. In a general example, a time difference of 0.3 seconds is set for each feeder, and the disconnection time of other automatic switches on the feeder needs to be about 50ms~100ms, which mainly depends on the performance of the switch. If only 2~3 time differences can be divided, 0.15 seconds tripping and 0 seconds tripping. The remaining automatic switches can only activate the overcurrent alarm.

[0070] The power restoration area is set up with power restoration switches and isolation switches through a common self-healing power restoration strategy, and the power restoration area is determined by the topological connection relationship between the power restoration switch and the isolation switch.

[0071] Step S2: judging whether the outgoing line switch of the opposite line is overloaded according to the load of the area to be restored and the load of the outgoing line switch of the opposite line.

[0072] It is understandable that it is necessary to determine whether the load in the area to be restored will cause the outgoing switch of the opposite line to be overloaded. If the outgoing switch of the opposite line is overloaded, load reduction and self-healing are required. If the outgoing switch of the opposite line is not overloaded, load reduction and self-healing are not required, and the self-healing and power restoration operation can be achieved through the ordinary self-healing and power restoration strategy of the area to be restored.

[0073] Step S3: When it is determined that the outgoing line switch of the opposite line is overloaded, the load reduction requirement is determined according to the overload condition of the outgoing line switch of the opposite line.

[0074] The load shedding requirement refers to the load that needs to be shedding, which is caused by the overload of the outgoing switch of the opposite line. Specifically, the load shedding requirement is calculated by subtracting the load current of the outgoing switch of the opposite line before the fault from the load current of the isolating switch in the power-restored area, and then subtracting the rated current of the outgoing switch of the opposite line.

[0075] If there are multiple opposite lines, they are arranged from small to large according to the load shedding demand, and one of the opposite lines is selected for calculation. Figure 1 For the feeder line corresponding to the outgoing switch CB2, the load reduction demand IL4 of the tie switch L4 is IL4=Ik3-(I2e-I2), where Ik3 is the load current of the disconnector k3, I2e is the rated current of the outgoing switch of the opposite line, and I2 is the load current of the outgoing switch of the opposite line before the fault.

[0076] Step S4, according to the preset load shedding priority mode, determine the automatic switch that meets the load shedding demand as the load shedding switch, the load shedding switch is used to perform load shedding operation on the load of the outgoing switch of the opposite line, and the preset load shedding priority mode includes branch line load shedding priority mode, trunk line load shedding priority mode and branch and trunk line mixed load shedding mode.

[0077] Among them, different load shedding priority modes have different choices for load shedding switches. The load shedding switch is used to reduce the load of the outgoing switch of the opposite line, so that the waiting-for-power-on area after the load shedding switch is turned on meets the load shedding demand and does not cause the outgoing switch of the opposite line to be overloaded.

[0078] Among them, the branch line load reduction priority method refers to giving priority to load reduction on branch lines, the trunk line load reduction priority method refers to giving priority to load reduction on trunk lines, and the branch-trunk mixed load reduction method refers to reducing load on both trunk lines and branch lines without distinguishing the priority principles.

[0079] Step S5: perform load shedding and self-healing power restoration operations through the load shedding switch, the power restoration switch and the isolating switch.

[0080] In some embodiments, the load shedding self-healing and power restoration operation is performed by pulling open all the isolating switches and the load shedding switches, and closing a power restoration switch to check whether all the power restoration areas are fully restored. If there are still power restoration areas that have not been fully restored, the power restoration switches of the power restoration areas are closed until all the power restoration areas are fully restored, completing the load shedding self-healing process. If there are still power restoration areas that have not been fully restored after all the power restoration switches are closed, the next contact switch with a larger load shedding demand is selected, and the process is skipped to step S4 for processing, and this is repeated until all the power restorations are successful or no power restoration solution is available.

[0081] It should be noted that the embodiment of the present application determines the power restoration switch and the isolating switch through the electrical topological connection relationship of the distribution network and the opening and closing status of each automatic switch, thereby determining the area to be restored, and judging whether the area to be restored causes the overload of the outgoing switch of the opposite line, and determining the load reduction demand according to the overload condition of the outgoing switch of the opposite line, and determining the load reduction demand through the load reduction priority method as the load reduction switch, and performing load reduction and self-healing and power restoration operations through the load reduction switch, the power restoration switch and the isolating switch, thereby avoiding the overload of the outgoing switch of the opposite line caused by the load in the area to be restored, and realizing the transfer of all non-fault area loads to the opposite line for load reduction and self-healing and power restoration operations, and realizing the load reduction and power transfer method, the power supply to the non-fault area of ​​the distribution line is restored to the greatest extent, thereby improving the power supply reliability of the distribution network.

[0082] The embodiments of the present application can be completely implemented by computer without manual intervention, and the self-healing and power restoration speed is very fast, which greatly reduces the power outage time caused by distribution network faults and maximizes the power supply reliability of the distribution lines.

[0083] In some embodiments, the step S1 of determining the area to be restored to power according to the electrical topological connection relationship of the distribution network and the opening and closing status of each automatic switch includes:

[0084] Step S101: When a line fault occurs in the distribution network, a fault cut-off switch is determined according to the electrical topology connection relationship of the distribution network, and the fault current signal is cut off by the fault cut-off switch; wherein the fault cut-off switch is an outgoing line switch that is closest to the fault location and receives the fault current signal.

[0085] Among them, the section currents of the automation switches CB1, CB2, CB3 and K1~K24 before the fault are recorded cyclically; the automation master station records the section current values ​​of all the above switches according to the section current scanning cycle T1 (T1 cycle can be set), as shown in Table 1.

[0086] Table 1 Negative current of each switch before fault

[0087]

[0088] Among them, when a line fault occurs in the distribution network, the automatic switch through which the fault current flows will feel it, such as Figure 1 As shown in the figure, when a line fault occurs between the outgoing switch CB1 and the automatic switch K1, the outgoing switch CB1 senses the fault current, while the other outgoing switches and the automatic switches K1~K24 do not sense it. At the same time, the outgoing switch CB1 is the outgoing switch closest to the fault location (farthest from the original power supply) and can receive the fault current signal, that is, the outgoing switch CB1 is used as a fault cut-off switch, and the fault current signal is cut off by the fault cut-off switch, and the fault information and switch position are transmitted to the master station system, wherein the fault information includes key fault action information such as protection action, overcurrent action, grounding action, and reclosing action.

[0089] Step S102: according to the electrical topology connection relationship of the distribution network, the connection line between the fault cut-off switch and the automation switch downstream of the fault cut-off switch which has not received the fault current signal and is closest to the fault cut-off switch in electrical distance is used as the line fault section line.

[0090] It is understandable that the line fault section line is composed of automatic switches that can send fault information. The switch closest to the upstream of the fault location can sense the fault current, so it is the upstream boundary switch. The downstream switch that is closest to the upstream boundary electrical distance and has no fault signal is the downstream boundary switch. For example, Figure 1 As shown, the line fault section line is the line between CB1 and K1 switches.

[0091] Step S103, determine the power restoration switch and the isolating switch according to the on / off status of all automatic switches electrically connected to the line in the line fault section and the electrical topological connection relationship, and determine the area formed between the isolating switch and the power restoration switch directly connected in the electrical topology as the area to be restored.

[0092] Specifically, the step S103 determines the power restoration switch and the isolation switch according to the on / off states of all the automatic switches electrically connected to the line in the line fault section and the electrical topological connection relationship, including:

[0093] Step S1031: According to the electrical topological connection relationship of the distribution network, determine the automatic switch that is electrically connected to the line in the line fault section and connected to the tie switch or the original power supply bus as a candidate isolating switch;

[0094] Among them, the automatic switch that is electrically connected to the line in the line fault section and connected to the tie switch, and the automatic switch that is electrically connected to the line in the line fault section and connected to the original power supply bus are both candidate isolation switches.

[0095] Step S1032: according to the open and closed states of the candidate disconnectors, the candidate disconnectors in the closed state are used as disconnectors;

[0096] Step S1033, taking all the automatic switches on the connection lines between the isolating switch and the opposite power supply bus and the original power supply bus as candidate power restoration switches;

[0097] Step S1034: according to the on / off state of the candidate power restoration switch, the candidate power restoration switch in the separated state is used as the power restoration switch.

[0098] It can be understood that the restoration switch and disconnector used for self-healing are determined according to the traditional self-healing logic, and the restoration switch and disconnector are determined according to the on / off status of all the automatic switches electrically connected to the line in the line fault section and the electrical topological connection relationship. Specifically, the automatic switch connected to the line in the line fault section and connected to the contact switch or the original power supply bus, and whose switch state is "on", is used as an isolation switch; the automatic switch with an on / off status of "off" on the connection line between the isolation switch and the opposite power supply bus and the original power supply bus is used as a restoration switch, where a switch is both an isolation switch and a restoration switch, it is only treated as an isolation switch. The area formed between the isolation switch and the restoration switch with a direct electrical topological connection is determined as the area to be restored.

[0099] For example, Figure 1 As shown, CB1 and K1 can be used as isolating switches, and contact switches L4, L5, and L6 can be used as power restoration switches. Among them, CB1 is both an isolating switch and a power restoration switch, and is only treated as an isolating switch; the area formed between K1 and contact switches L4, L5, and L6 is the power restoration area.

[0100] In some embodiments, judging whether the outgoing line switch of the opposite line is overloaded according to the load of the area to be restored and the load of the outgoing line switch of the opposite line in step S2 includes:

[0101] Step S201: Determine the restored load current of the area to be restored based on the load current of all disconnectors in the area to be restored and the load current of the outgoing line switch of the opposite line before the fault.

[0102] Among them, the section buffer current of the disconnector before the fault is used to estimate the load of the area to be restored, and the load of the area to be restored is added to the load of the outgoing line switch on the opposite side, that is, the load current of all disconnectors in the area to be restored and the load current of the outgoing line switch on the opposite side before the fault are added together to determine the restored load current of the area to be restored.

[0103] Step S202: determine whether the restored load current in the area to be restored is greater than the preset rated current of the opposite line.

[0104] Among them, the restored load current of the area to be restored is compared to see whether it exceeds the rated load value of the opposite-side outgoing line switch, that is, whether the restored load current of the area to be restored is greater than the preset rated current of the opposite-side line.

[0105] Step S203: When it is determined that the restored load current in the area to be restored is greater than the preset rated current of the opposite line, it is determined that the outgoing line switch of the opposite line is overloaded.

[0106] Step S204: When it is determined that the restored load current in the area to be restored is not greater than the preset rated current of the opposite line, it is determined that the outgoing line switch of the opposite line is not overloaded.

[0107] Among them, if it is determined that the outgoing line switch of the opposite line is not overloaded, it is processed according to the normal self-healing process, the self-healing isolation switch is opened, the self-healing power restoration switch is closed to restore the power supply to the rated current area of ​​the non-fault opposite line, and the self-healing process is ended. If it is determined that the outgoing line switch of the opposite line is overloaded, further load reduction self-healing operation is required.

[0108] In some embodiments, the preset load shedding priority mode is a branch line load shedding priority mode;

[0109] Determining an automatic switch that meets the load shedding demand as a load shedding switch according to a preset load shedding priority mode in step S4 includes:

[0110] Step S401: According to the electrical topology connection relationship of the distribution network, the line from the isolating switch to the selected transfer switch is used as the trunk line, and all the automatic switches on the trunk line are used as trunk switches.

[0111] The selected transfer switch refers to a power restoration switch selected based on needs, for example, Figure 1As shown, the line between the isolating switch K1 and the connecting switch L5 is used as the trunk line, all the automatic switches K1, K2, K3, and L5 on the trunk line are used as trunk switches, and the remaining automatic switches K11 to K24 are branch switches.

[0112] Step S402: According to multiple branches led out from the trunk line, multiple branch line switches closest to the trunk line switch are determined as backup load shedding switches, and the backup load shedding switches are not tie switches.

[0113] Among them, Figure 1 As shown, the branch line switches closest to the main line switch are the automation switches K11 and K21.

[0114] Step S403: determine whether the sum of the load currents of the plurality of standby load shedding switches is greater than the load current of the selected transfer connection switch.

[0115] Among them, the load shedding demand of the selected transfer and supply contact switch L5 is IL5=50A, and the branch line switches closest to the main line are K11 and K21, so Ik11+Ik21=150+90=240A>IL5, which meets the branch line load shedding demand. When it is judged that the sum of the load currents of multiple standby load shedding switches is not greater than the load current of the selected transfer and supply contact switch, it means that the branch line load shedding priority method cannot meet the load shedding demand, and the main line load shedding priority method is required to perform load shedding operations.

[0116] Step S404: when it is determined that the sum of the load currents of the plurality of standby load shedding switches is greater than the load current of the selected transfer connection switch, the plurality of standby load shedding switches in the power restoration area are arranged according to a preset load shedding priority.

[0117] Among them, the load shedding priority is divided into two dimensions, namely the number of users and the load. In a general example, if the multiple standby load shedding switches in the area to be restored are arranged according to the number of users, the number of branch line users will be arranged from small to large. If the multiple standby load shedding switches in the area to be restored are arranged according to the load size, the multiple standby load shedding switches in the area to be restored are arranged from small to large according to the load.

[0118] Step S405: for each branch line, determine in turn according to the sorting result whether the load current of the standby load shedding switch in the branch line is greater than or equal to the load shedding demand, obtain the first standby load shedding switch that satisfies the condition of being greater than or equal to the load shedding demand as the load shedding switch of the branch line, and use the load shedding switches of all branches as load shedding switches.

[0119] Among them, the simulation is separated in sequence to check whether the load current of the standby load shedding switch in the branch line is greater than the load shedding demand. Specifically, the first controllable standby load shedding switch with a cross-section current exceeding the load shedding demand is selected according to the sorted switch sequence. If it is found, it can be listed as the branch line load shedding switch; if it is not found, multiple standby load shedding switches in different branches are searched first until the load shedding demand is met, and all the switches found are listed as load shedding switches.

[0120] For example, Figure 1 As shown, the load shedding demand of the interconnecting switch L5 is IL5=50A, and the cross-section current of the switch K14 before the fault is 50A, which can meet the load shedding demand of the interconnecting switch L5. Therefore, K14 is listed as the branch line load shedding switch.

[0121] In some embodiments, the preset load shedding priority mode is a trunk line load shedding priority mode;

[0122] Determining an automatic switch that meets the load shedding demand as a load shedding switch according to a preset load shedding priority mode in step S4 includes:

[0123] Step S411: Use multiple automatic switches on the line between the isolating switch in the area to be restored to power and the selected transfer switch as candidate load shedding switches for the trunk line.

[0124] Among them, Figure 1 As shown, multiple automatic switches K1, K2, K3, and L5 on the line between the isolating switch K1 in the area to be restored to power and the selected transfer switch L5 are used as alternative load shedding switches for the main line.

[0125] Step S412, sorting a plurality of trunk candidate load shedding switches from near to far from the original power supply, and taking the difference between the trunk candidate load shedding switch and the next adjacent trunk candidate load shedding switch as the first load shedding amount of the trunk candidate load shedding switch according to the sorting result, and marking the trunk candidate load shedding switch;

[0126] Step S413, determining whether the first load reduction amount is greater than the load reduction requirement;

[0127] Step S414: if it is determined that the first load reduction amount is greater than the load reduction requirement, the trunk line alternative load reduction switch is used as the load reduction switch;

[0128] Step S415: if it is determined that the first load shedding amount is not greater than the load shedding demand, the difference between the unmarked trunk candidate load shedding switch and the next adjacent trunk candidate load shedding switch is used as the second load shedding amount of the trunk candidate load shedding switch according to the sorting result, and the unmarked trunk candidate load shedding switch is marked;

[0129] Step S416, determining whether the sum of the first load reduction amount and the second load reduction amount is greater than the load reduction requirement;

[0130] Step S417: if it is determined that the sum of the first load reduction amount and the second load reduction amount is greater than the load reduction demand, the marked trunk line candidate load reduction switch is used as the load reduction switch;

[0131] Step S418: If it is determined that the sum of the first load-reducible amount and the second load-reducible amount is not greater than the load-reduction requirement, continue to traverse the unmarked main line candidate load-reduction switches according to the sorting result until the sum of the load-reduction amounts of the marked main line candidate load-reduction switches is greater than the load-reduction requirement, and use the marked main line candidate load-reduction switches as the load-reduction switches.

[0132] Exemplarily, the trunk alternative load shedding switches are sorted from the closest to the original power supply to the farthest, and a trunk load shedding switch sequence list is compiled. Based on the trunk load shedding switch sequence list, the load current of the trunk alternative load shedding switch closest to the power supply is subtracted from the current of the next trunk alternative load shedding switch as the load shedding amount; according to whether the load shedding amount of the trunk alternative load shedding switch closest to the power supply point meets the load shedding demand, if it does, the trunk alternative load shedding switch is listed as the load shedding switch; otherwise, the load shedding amount of the next trunk segment is added until the load shedding demand is met, and the load shedding self-healing and power restoration operation is performed. If the load shedding of several lines to the last segment switch still cannot meet the load shedding demand, the main and branch line mixed load shedding processing flow is entered.

[0133] like Figure 2 For the trunk line path between the L5 contact point and the disconnector K1, the trunk switch sequence can be arranged as K1, K2, K3, and L5. The load reduction between K1 and K2 is Ik1k2=330-180=150A, the load reduction between K2 and K3 is Ik2k3=180-90=90A, and the load reduction requirement of the L5 contact switch is IL5=50A; if the load is reduced step by step through the trunk line, Ik1k2>IL5, that is, the first-level trunk load reduction meets the load reduction requirement, and K2 is the trunk load reduction switch.

[0134] In some embodiments, the preset load shedding priority mode is a branch-trunk mixed load shedding mode;

[0135] Determining an automatic switch that meets the load shedding demand as a load shedding switch according to a preset load shedding priority mode in step S4 includes:

[0136] Step S421, constructing a tree structure with the selected transfer contact switch as the root node, the line from the selected transfer contact switch to the isolating switch in the area to be restored as the trunk, and the automatic switches on all branch lines as the branch nodes of the trunk;

[0137] Step S422, sorting the branch switches on the tree structure according to the load shedding priority, and using the branch switches as standby load shedding switches;

[0138] Step S423: judging whether the load current of any standby load shedding switch before the fault is greater than or equal to the load shedding demand according to the sorting result;

[0139] Step S424: if it is determined that the load current of any standby load shedding switch before the fault is greater than or equal to the load shedding demand, the standby load shedding switch may be listed as a branch line load shedding switch;

[0140] Step S425: If it is determined that the load current of any standby load shedding switch before the fault is less than the load shedding demand, continue to search for other standby load shedding switches on different branches, and determine whether the load current of other standby load shedding switches on different branches before the fault is greater than or equal to the load shedding demand, until the load current of the standby load shedding switch before the fault is greater than or equal to the load shedding demand, and obtain the branch line load shedding switch.

[0141] The selected transfer contact switch is the root node, the line from the selected transfer contact switch to the disconnector in the waiting area is the trunk, and the automatic switches on all branches are the branch nodes of the trunk, which are organized as follows: Figure 4 The tree structure shown.

[0142] Exemplarily, according to different transfer schemes, calculations are performed. If the outgoing switch CB3 in the line is used as the transfer line, the connecting switch L5 is the root node, the boundary switch K1 below the fault point is the end, the connecting path between the L5-K1 switches is the trunk line, and the remaining lines are branches.

[0143] Sort the controllable branch line switches in the area to be restored according to the load shedding priority (number of users or load). If the number of users is prioritized, the branch line users are arranged from small to large. If the load is prioritized, the load is arranged from small to large, and the controllable branch line switches are used as backup load shedding switches. Select any backup load shedding switch according to the sorted switch sequence to see if the load before the fault is greater than or equal to the load shedding demand. If so, it can be listed as the branch line load shedding switch; if not, continue to find multiple backup load shedding switches in non-same branches until it is greater than or equal to the load shedding demand. If multiple load shedding solutions can be found, select the solution with the least load shedding or the least number of users as the load shedding solution, list the found switch as the load shedding switch, and perform the load shedding self-healing restoration operation.

[0144] Based on the same inventive concept, an embodiment of the present application further provides a load shedding and self-healing power restoration system for implementing the load shedding and self-healing power restoration method involved above.

[0145] The implementation solution provided by the system to solve the problem is similar to the implementation solution recorded in the above method, so the specific limitations in one or more load shedding self-healing and power restoration system embodiments provided below can refer to the limitations on the load shedding self-healing and power restoration method above, and will not be repeated here.

[0146] like Figure 5 As shown, an embodiment of the present application provides a load shedding self-healing power restoration system, comprising:

[0147] The module 100 for determining the area to be restored is used to respond to the request for self-healing restoration of power in the distribution network due to line faults, and to determine the area to be restored according to the electrical topological connection relationship of the distribution network and the opening and closing status of each automatic switch; the area to be restored includes a restoration switch and an isolating switch;

[0148] An overload judgment module 200 is used to judge whether the outgoing line switch of the opposite line is overloaded according to the load of the area to be restored and the load of the outgoing line switch of the opposite line;

[0149] The load shedding requirement module 300 is used to determine the load shedding requirement according to the overload condition of the outgoing line switch of the opposite line when it is determined that the outgoing line switch of the opposite line is overloaded;

[0150] The load shedding switch determination module 400 is used to determine an automatic switch that meets the load shedding demand as a load shedding switch according to a preset load shedding priority mode. The load shedding switch is used to perform a load shedding operation on the load of the outgoing switch of the opposite line. The preset load shedding priority mode includes a branch line load shedding priority mode, a trunk line load shedding priority mode, and a branch-trunk mixed load shedding mode.

[0151] The load shedding self-healing and power restoration module 500 is used to perform load shedding self-healing and power restoration operations through a load shedding switch, a power restoration switch and an isolating switch.

[0152] like Figure 6 As shown, an embodiment of the present application provides an electronic device, the electronic device 10 includes a memory 20 and a processor 30, the memory 20 stores a computer program, and when the computer program is executed by the processor 30, the processor 30 executes the steps of the load reduction self-healing power restoration method as in any of the above embodiments.

[0153] An embodiment of the present application provides a computer-readable storage medium having a computer program stored thereon. When the computer program is executed, the steps of the load shedding self-healing power restoration method as described in any of the above embodiments are implemented.

[0154] This embodiment is applicable to the situation of topology identification of distribution network. The method can be executed by a topology identification device of distribution network. The topology identification device of distribution network can be implemented in the form of hardware and / or software. The topology identification device of distribution network can be configured in a computer device.

[0155] Those skilled in the art can clearly understand that, for the convenience and brevity of description, the specific working processes of the above-described system, electronic device and computer storage medium can refer to the corresponding processes in the aforementioned method embodiments and will not be repeated here.

[0156] It should be noted that the terms "including" and "having" and any variations thereof in the specification and claims of the present invention and the above-mentioned drawings are intended to cover non-exclusive inclusions. For example, a process, method, system, product or apparatus comprising a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or apparatus.

[0157] In several embodiments provided by the present invention, it is understood that each box in the flow chart or block diagram can represent a module, a program segment or a part of a code, and a part of a module, a program segment or a code includes one or more executable instructions for realizing the specified logical function. It should also be noted that in some alternative implementations, the functions marked in the box can also occur in a different order from that marked in the accompanying drawings. For example, two consecutive boxes can actually be executed substantially in parallel, and they can sometimes be executed in the opposite order, depending on the functions involved.

[0158] In the several embodiments provided by the present invention, it should be understood that the disclosed systems, electronic devices, computer storage media and methods can be implemented in other ways. For example, the device embodiments described above are only schematic. For example, the division of units is only a logical function division. There may be other division methods in actual implementation. For example, multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be an indirect coupling or communication connection through some interfaces, devices or units, which can be electrical, mechanical or other forms.

[0159] The units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed on multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0160] In addition, each functional unit in each embodiment of the present invention may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit. The above-mentioned integrated unit may be implemented in the form of hardware or in the form of software functional units.

[0161] If the integrated unit is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present invention is essentially or the part that contributes to the prior art or all or part of the technical solution can be embodied in the form of a software product. The computer software product is stored in a storage medium, including several instructions for executing all or part of the steps of the method described in each embodiment of the present invention through a computer device (which can be a personal computer, server, or network device, etc.). The aforementioned storage medium includes: U disk, mobile hard disk, read-only memory (full name in English: Read-Only Memory, English abbreviation: ROM), random access memory (full name in English: Random Access Memory, English abbreviation: RAM), disk or optical disk and other media that can store program codes.

[0162] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features may be replaced by equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A load shedding self-healing power restoration method, characterized in that: include: In response to a request for self-healing power restoration of a line fault in a distribution network, a power restoration area to be restored is determined according to an electrical topological connection relationship of the distribution network and an opening and closing state of each automatic switch; The power restoration area includes a power restoration switch and an isolating switch; Determining whether the outgoing line switch of the opposite line is overloaded according to the load of the area to be restored and the load of the outgoing line switch of the opposite line; When it is determined that the outgoing line switch of the opposite line is overloaded, the load reduction requirement is determined according to the overload condition of the outgoing line switch of the opposite line; According to a preset load shedding priority mode, an automatic switch that meets the load shedding demand is determined as a load shedding switch, and the load shedding switch is used to perform a load shedding operation on the load of the outgoing switch of the opposite line. The preset load shedding priority mode includes a branch line load shedding priority mode, a trunk line load shedding priority mode, and a branch-trunk mixed load shedding mode; The preset load shedding priority mode is the branch line load shedding priority mode; The step of determining an automatic switch that meets the load shedding demand as a load shedding switch according to a preset load shedding priority mode includes: According to the electrical topological connection relationship of the distribution network, the line from the isolating switch to the selected transfer switch is used as the trunk line, and all the automatic switches on the trunk line are used as trunk switches; According to the multiple branches drawn out from the trunk line, multiple branch line switches closest to the trunk line switch are determined as backup load shedding switches, and the backup load shedding switches are not tie switches; Determine whether the sum of the load currents of the plurality of standby load shedding switches is greater than the load current of the selected transfer and connection switch; When it is determined that the sum of the load currents of the plurality of standby load shedding switches is greater than the load current of the selected transfer and supply connection switch, the plurality of standby load shedding switches in the waiting power restoration area are arranged according to a preset load shedding priority; For each branch line, determine in turn whether the load current of the standby load shedding switch in the branch line is greater than or equal to the load shedding demand according to the sorting result, obtain the first standby load shedding switch that satisfies the condition that the load current is greater than or equal to the load shedding demand as the load shedding switch of the branch line, and use the load shedding switches of all branches as load shedding switches; The load shedding and self-healing power restoration operation is performed through the load shedding switch, the power restoration switch and the isolating switch.

2. The load shedding self-healing power restoration method according to claim 1, characterized in that: The step of determining the area to be restored to power according to the electrical topological connection relationship of the distribution network and the opening and closing status of each automatic switch comprises: When a line fault occurs in the distribution network, a fault cut-off switch is determined according to the electrical topological connection relationship of the distribution network, and the fault current signal is cut off by the fault cut-off switch; wherein the fault cut-off switch is an outgoing line switch which is closest to the fault location and receives the fault current signal; According to the electrical topological connection relationship of the distribution network, a connection line between the fault cut-off switch and an automatic switch downstream of the fault cut-off switch that has not received the fault current signal and is closest to the fault cut-off switch in electrical distance is used as a line fault section line; According to the opening and closing states of all automatic switches electrically connected to the line in the fault section of the line and the electrical topological connection relationship, the power restoration switch and the isolating switch are determined, and the area formed between the isolating switch and the power restoration switch that are directly electrically topologically connected is determined as the area to be restored.

3. The load shedding self-healing power restoration method according to claim 2, characterized in that: The step of determining the power restoration switch and the isolation switch according to the on / off states of all automatic switches electrically connected to the line in the line fault section and the electrical topological connection relationship comprises: According to the electrical topological connection relationship of the distribution network, determine the automatic switch that is electrically connected to the line in the fault section of the line and connected to the tie switch or the original power supply bus as a candidate isolating switch; According to the open and closed states of the candidate disconnectors, the candidate disconnectors in the closed state are used as disconnectors; All automatic switches on the connection lines between the isolating switch and the opposite power supply bus and the original power supply bus are used as candidate power restoration switches; According to the on / off state of the candidate power restoration switch, the candidate power restoration switch in the separated state is used as the power restoration switch.

4. The load shedding self-healing power restoration method according to claim 2, characterized in that: The determining whether the outgoing line switch of the opposite line is overloaded according to the load of the area to be restored and the load of the outgoing line switch of the opposite line comprises: Determine the restoration load current of the area to be restored based on the load current of all disconnectors in the area to be restored and the load current of the outgoing line switch of the opposite line before the fault; Determine whether the restored load current of the area to be restored is greater than a preset rated current of the opposite line; When it is determined that the restored load current of the area to be restored is greater than the preset rated current of the opposite line, it is determined that the outgoing line switch of the opposite line is overloaded; When it is determined that the restored load current of the area to be restored is not greater than the preset rated current of the opposite line, it is determined that the outgoing line switch of the opposite line is not overloaded.

5. The load shedding self-healing power restoration method according to claim 1, characterized in that: The preset load shedding priority mode is the trunk line load shedding priority mode; The step of determining an automatic switch that meets the load shedding demand as a load shedding switch according to a preset load shedding priority mode includes: Use multiple automatic switches on the line between the isolating switch in the area to be restored to power and the selected transfer switch as the main line alternative load shedding switches; Sorting the plurality of the trunk candidate load shedding switches from near to far from the original power supply, and taking the difference between the trunk candidate load shedding switch and the next adjacent trunk candidate load shedding switch as the first load shedding amount of the trunk candidate load shedding switch according to the sorting result, and marking the trunk candidate load shedding switch; Determining whether the first load reduction amount is greater than the load reduction requirement; If it is determined that the first load shedding amount is greater than the load shedding requirement, the trunk line alternative load shedding switch is used as the load shedding switch; If it is determined that the first load shedding amount is not greater than the load shedding demand, the difference between the unmarked trunk candidate load shedding switch and the next adjacent trunk candidate load shedding switch is used as the second load shedding amount of the trunk candidate load shedding switch according to the sorting result, and the unmarked trunk candidate load shedding switch is marked; Determining whether the sum of the first load reduction amount and the second load reduction amount is greater than the load reduction requirement; If it is determined that the sum of the first load reduction amount and the second load reduction amount is greater than the load reduction requirement, the marked main line alternative load reduction switch is used as the load reduction switch; If it is determined that the sum of the first load-reducing amount and the second load-reducing amount is not greater than the load-reduction requirement, continue to traverse the unmarked main line alternative load-reduction switches according to the sorting results until the sum of the load-reduction amounts of the marked main line alternative load-reduction switches is greater than the load-reduction requirement, and use the marked main line alternative load-reduction switches as load-reduction switches.

6. The load shedding self-healing power restoration method according to claim 1, characterized in that: The preset load shedding priority mode is a branch-trunk mixed load shedding mode; The step of determining an automatic switch that meets the load shedding demand as a load shedding switch according to a preset load shedding priority mode includes: A tree structure is constructed by taking the selected transfer contact switch as the root node, the line from the selected transfer contact switch to the isolating switch in the area to be restored as the trunk, and the automatic switches on all branch lines as the branch nodes of the trunk; Sorting the branch switches on the tree structure according to the load shedding priority, and using the branch switches as standby load shedding switches; Determine whether the load current of any of the standby load shedding switches before the failure is greater than or equal to the load shedding demand according to the sorting result; If it is determined that the load current of any of the standby load shedding switches before the fault is greater than or equal to the load shedding demand, the standby load shedding switch may be listed as a branch line load shedding switch; If it is determined that the load current of any one of the standby load shedding switches before the fault is less than the load shedding demand, continue looking for other standby load shedding switches on different branches, and determine whether the load current of other standby load shedding switches on different branches before the fault is greater than or equal to the load shedding demand, until the load current of the standby load shedding switch before the fault is greater than or equal to the load shedding demand, and obtain the branch line load shedding switch.

7. A load shedding self-healing power restoration system, characterized in that: include: A module for determining a waiting power restoration area, for responding to a line fault self-healing power restoration request of a distribution network, and determining a waiting power restoration area according to an electrical topological connection relationship of the distribution network and an opening and closing state of each automatic switch; the waiting power restoration area includes a power restoration switch and an isolating switch; An overload judgment module, used for judging whether the outgoing line switch of the opposite line is overloaded according to the load of the area to be restored and the load of the outgoing line switch of the opposite line; A load shedding requirement module, configured to determine a load shedding requirement according to the overload condition of the outgoing line switch of the opposite line when it is determined that the outgoing line switch of the opposite line is overloaded; A load shedding switch determination module, used to determine an automated switch that meets the load shedding demand as a load shedding switch according to a preset load shedding priority mode, wherein the load shedding switch is used to perform a load shedding operation on the load of the outgoing switch of the opposite line, and the preset load shedding priority mode includes a branch line load shedding priority mode, a trunk line load shedding priority mode, and a branch-trunk mixed load shedding mode; The preset load shedding priority mode is the branch line load shedding priority mode; Determining an automatic switch that meets the load shedding demand as a load shedding switch according to a preset load shedding priority mode includes: According to the electrical topological connection relationship of the distribution network, the line from the isolating switch to the selected transfer switch is used as the trunk line, and all the automatic switches on the trunk line are used as trunk switches; According to the multiple branches drawn out from the trunk line, multiple branch line switches closest to the trunk line switch are determined as backup load shedding switches, and the backup load shedding switches are not tie switches; Determine whether the sum of the load currents of the plurality of standby load shedding switches is greater than the load current of the selected transfer and connection switch; When it is determined that the sum of the load currents of the plurality of standby load shedding switches is greater than the load current of the selected transfer and supply connection switch, the plurality of standby load shedding switches in the waiting power restoration area are arranged according to a preset load shedding priority; For each branch line, determine in turn whether the load current of the standby load shedding switch in the branch line is greater than or equal to the load shedding demand according to the sorting result, obtain the first standby load shedding switch that satisfies the condition that the load current is greater than or equal to the load shedding demand as the load shedding switch of the branch line, and use the load shedding switches of all branches as load shedding switches; The load shedding self-healing and power restoration module is used to perform load shedding self-healing and power restoration operations through the load shedding switch, the power restoration switch and the isolation switch.

8. An electronic device, characterized in that: The electronic device includes a memory and a processor, wherein a computer program is stored in the memory, and when the computer program is executed by the processor, the processor executes the steps of the load shedding self-healing power restoration method according to any one of claims 1 to 6.

9. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the computer program is executed, the steps of the load shedding self-healing power restoration method according to any one of claims 1 to 6 are implemented.

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