Load splitting power restoration method, system, equipment and medium

Abstract

The invention relates to a power system power recovery technology, and discloses a load splitting power recovery method, system and equipment and a medium. The method comprises the following steps: responding to a power distribution network line fault self-healing power restoration request, identifying a power restoration switch and an isolation switch, and determining a to-be-power-restored area; and evaluating the load of the to-be-recovered power area and the load of the outgoing line switch of the opposite-side line, and judging whether an overload risk exists or not. And if overload is detected, power restoration operation is executed through the load transfer switch and the isolation switch according to the electrical topological relation. According to the method, the problem that the loads of all non-fault areas cannot be transferred due to the fact that the loads of the to-be-recovered areas of the fault lines are too heavy or the original loads of the opposite-side lines are too large is solved, and self-healing program locking is avoided. Aiming at the problem that a to-be-recovered area of a power distribution network fault line is overloaded or an original load of an opposite side line is overloaded, through a load splitting self-healing power recovery strategy, the power failure range is effectively reduced, the power failure influence is reduced, power supply of a non-fault area is recovered as much as possible, and the power supply reliability of the power distribution network is remarkably improved.

Description

Technical Field

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

[0002] In recent years, technologies such as distribution self-healing, feeder automation FA, and programmed operation have developed rapidly and are widely used to quickly restore power supply after distribution line faults. At present, in most cases, both self-healing technology and programmed operation give priority to the reliability of power supply, mainly restoring the load in non-fault areas as a whole. However, in daily operation, due to problems such as heavy overall load on some faulty lines and weak load-carrying capacity of the opposite lines, it is impossible to achieve overall restoration of the load in non-fault areas. Therefore, in this case, programs such as distribution self-healing, feeder automation FA, and programmed operation are usually only handled in a locked manner. For example: Figure 1 As shown, when a fault occurs between the section switch FB2 and the section switch FB3, under normal circumstances, the distribution self-healing, feeder automation FA, programmed operation and other programs will disconnect the section switches FB2 and FB3 to isolate the fault area, and then close one of the tie switches LB1, LB2, and LB3 according to the specific load conditions to restore the load power supply in the non-fault area as a whole.

[0003] like Figure 2 As shown in the figure, if the non-fault area (the line between FB3 and LB1 / LB2 / LB3) is heavily loaded, and the original load of the opposite line is large or the load capacity is insufficient, the self-healing can only choose not to act or lock, to avoid secondary faults caused by overload after self-healing transfer, resulting in the expansion of the power outage. In this case, the self-healing function is difficult to play a role, and it is difficult to directly transfer all the loads in the non-fault area to the opposite line, resulting in the locking of the self-healing program, and it is difficult to quickly restore the power supply of the loads in the non-fault area, resulting in the expansion of the power outage and poor power supply reliability of the line. Summary of the invention

[0004] In view of this, the present invention provides a load splitting and power restoration method, system, equipment and medium, which solves the technical problem that the current power restoration scheme is difficult to directly transfer all non-fault area loads to the opposite line as a whole, resulting in the self-healing program being locked, and it is difficult to quickly restore power supply to loads in non-fault areas, resulting in the expansion of the power outage scope and poor power supply reliability of the line.

[0005] A first aspect of the present invention provides a load splitting and power restoration method, comprising:

[0006] In response to a request for self-healing power restoration of a line fault in a distribution network, a first power restoration switch and a disconnecting switch are determined according to the electrical topological connection relationship of the distribution network and the opening and closing status of each automatic switch, and an area formed by the topological connection between the first power restoration switch and the disconnecting switch is determined as a waiting power restoration area;

[0007] 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;

[0008] When it is determined that the outgoing line switch of the opposite line is overloaded, the load splitting path of the area to be restored is determined according to the electrical topological connection relationship of the distribution network, the load splitting path is the connection line from the isolating switch to the tie switch, and the load splitting path includes a plurality of segment switches;

[0009] Determine the load transfer switches corresponding to each segmented load line section in the area to be restored according to the load splitting path; wherein the load transfer switches are used to transfer the load of each segmented load line section;

[0010] The power restoration operation is performed on the area to be restored to power through the load transfer switch and the isolation switch.

[0011] Preferably, according to the electrical topological connection relationship of the distribution network and the opening and closing status of each automatic switch, the first power restoration switch and the isolating switch are determined, and according to the area formed by the topological connection between the first power restoration switch and the isolating switch, the area to be restored to power is determined, including:

[0012] When a line fault occurs in the distribution network, the fault current signal is cut off by an outgoing line switch which is closest to the fault location and receives the fault current signal;

[0013] According to the electrical topological connection relationship of the distribution network, the line between the automatic switch closest to the upstream of the fault location and the automatic switch closest to the downstream of the fault location is the line fault section;

[0014] According to the electrical topological connection relationship of the distribution network, determine the automatic switch electrically connected to the line fault section and connected to the tie switch / original power supply bus as a candidate isolating switch;

[0015] According to the open and closed states of the candidate disconnectors, the candidate disconnectors in the closed state are used as disconnectors;

[0016] The automatic switch connecting the isolating switch to the opposite power supply busbar / the original power supply busbar is used as a candidate power restoration switch;

[0017] 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 first power restoration switch;

[0018] The area where the isolating switch and the power restoration switch are directly electrically topologically connected is determined as the power restoration area.

[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 method further comprises:

[0025] According to the electrical topological connection relationship of the distribution network, it is determined whether the area to be restored to power has at least one tie switch for transferring power to the area to be restored to power;

[0026] When it is determined that the area to be restored has at least one connecting switch for transferring power to the area to be restored, the step of continuing to determine the load splitting path from the isolating switch to the connecting switch according to the electrical topological connection relationship of the distribution network;

[0027] When it is determined that there is no at least one contact switch in the area to be restored to power that switches power to the area to be restored to power, the area to be restored to power is restored to power through the first restoration switch and the isolation switch.

[0028] Preferably, determining the load splitting path of the area to be restored to power according to the electrical topological connection relationship of the distribution network includes:

[0029] Determine multiple candidate load splitting paths according to the electrical topological connection relationship of the distribution network and the connection lines between the isolation switch and multiple tie switches;

[0030] According to the plurality of candidate load splitting paths, a candidate load splitting path including the largest number of segment switches is selected as the load splitting path.

[0031] Preferably, the load transfer switch includes a second power restoration switch and a split switch;

[0032] The step of determining the load transfer switches corresponding to the respective segmented load line sections in the area to be restored to power according to the load splitting path includes:

[0033] Sort the tie switches connected on the load splitting path from near to far according to their distance from the original power supply point;

[0034] Determine the maximum transfer load of the tie switch in sequence according to the sorting results, and determine the corresponding section load transferred by the tie switch according to the maximum transfer load of the tie switch;

[0035] According to the sectional load transferred by the contact switch, a sectional load line section composed of a plurality of sectional switches satisfying the sectional load is determined;

[0036] The tie switch corresponding to the segmented load line section is used as the second power restoration switch, and the segment switches at both ends of the segmented load line section are used as split switches;

[0037] Update the next contact switch, and based on the updated contact switch, repeat the steps of determining the maximum transfer load of the contact switch in sequence according to the sorting results, and determining the corresponding segmented load transferred by the contact switch according to the maximum transfer load of the contact switch, until all segmented switches in the area to be restored are transferred by the load transfer switch.

[0038] Preferably, the operation of restoring power to the area to be restored to power by using the load transfer switch and the isolation switch includes:

[0039] The power restoration operation is performed on the area to be restored by opening all the isolating switches and the splitting switches and closing all the second power restoration switches.

[0040] In a second aspect, the present invention further provides a load splitting and power restoration system, comprising:

[0041] A module for determining a waiting-for-power-restore area, for responding to a request for self-healing power restoration of a line fault in a distribution network, determining a first power restoration switch and a disconnecting switch according to an electrical topological connection relationship of the distribution network and an opening and closing state of each automatic switch, and determining an area formed by a topological connection between the first power restoration switch and the disconnecting switch as a waiting-for-power-restore area;

[0042] 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;

[0043] A splitting path determination module is used to determine the load splitting path of the area to be restored to power according to the electrical topological connection relationship of the distribution network when it is determined that the outgoing line switch of the opposite line is overloaded, wherein the load splitting path is the connection line from the isolating switch to the tie switch, and the load splitting path includes a plurality of segment switches;

[0044] A transfer switch determination module is used to determine the load transfer switches corresponding to each segmented load line section in the area to be restored according to the load splitting path; wherein the load transfer switch is used to transfer the load of each segmented load line section;

[0045] A power restoration operation module is used to restore power to the area to be restored through the load transfer switch and the isolation switch.

[0046] 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 splitting and power restoration method as described in the first aspect.

[0047] In a fourth aspect, the present invention further provides a computer-readable storage medium having a computer program stored thereon, and when the computer program is executed, the steps of the load splitting and power restoration method as described in the first aspect are implemented.

[0048] It can be seen from the above technical solutions that the present invention responds to the line fault self-healing and power restoration request of the distribution network, identifies the first power restoration switch and the isolating switch according to the electrical topological connection relationship of the distribution network and the opening and closing status of each automatic switch, and determines a waiting power restoration area; by evaluating the load condition of the waiting power restoration area and the load of the outgoing line switch of the opposite line, it is judged whether the outgoing line switch has an overload risk. If an overload condition is detected, the power restoration operation will be performed on the waiting power restoration area through these load transfer switches and isolating switches according to the electrical topological relationship of the distribution network. The present invention solves the problem that the load of the area to be restored by the fault line is too heavy or the original load of the opposite line is too large, thereby avoiding the locking of the self-healing program. In view of the common problem of the area to be restored by the fault line being too heavy or the original load of the opposite line being too large in the distribution network, the present invention effectively reduces the scope of power outages and reduces the impact of power outages through load splitting self-healing and power restoration strategies, and restores the power supply of non-fault areas as much as possible, thereby significantly improving the reliability of power supply in the distribution network. BRIEF DESCRIPTION OF THE DRAWINGS

[0049] 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.

[0050] Figure 1 This is a schematic diagram of self-healing and power transfer in the fault area under normal circumstances;

[0051] Figure 2 This is a schematic diagram of self-healing lockout of the fault area under heavy load conditions;

[0052] Figure 3 An application environment of a load splitting and power restoration method provided by an embodiment of the present invention;

[0053] Figure 4 A flow chart of a load splitting and power restoration method provided by an embodiment of the present invention;

[0054] Figure 5 This is a schematic diagram of self-healing power transfer in the fault area when the fault line is overloaded;

[0055] Figure 6a~Figure 6c They are schematic diagrams of load splitting paths for different section switches;

[0056] Figure 7 The load splitting scheme and switch schematic diagram of the area to be restored;

[0057] Figure 8 A schematic diagram of the structure of a load splitting and power restoration system provided by an embodiment of the present invention;

[0058] Fig. 9 A schematic diagram of the structure of an electronic device provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0059] 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.

[0060] The load splitting and power restoration method provided in the embodiment of the present application can be applied to Figure 3In the application environment shown, the distribution network communicates with the server 102 via a network. The data storage system can store data that the server 102 needs to process. The data storage system can be integrated on the server 102, or placed on the cloud or other network servers. The server 102 responds to the line fault self-healing power restoration request of the distribution network, determines the first power restoration switch and the isolating switch according to the electrical topological connection relationship of the distribution network and the opening and closing status of each automatic switch, and determines the area formed by the topological connection between the first power restoration switch and the isolating switch as the area to be restored; judges whether the outgoing switch of the opposite line is overloaded according to the load of the area to be restored and the load of the outgoing switch of the opposite line; when it is judged that the outgoing switch of the opposite line is overloaded, the load splitting path of the area to be restored is determined according to the electrical topological connection relationship of the distribution network, the load splitting path is the connection line from the isolating switch to the connecting switch, and the load splitting path includes multiple segment switches; determines the load transfer switches corresponding to each segmented load line section in the area to be restored according to the load splitting path; wherein the load transfer switch is used to transfer the load of each segmented load line section; and performs power restoration operation on the area to be restored through the load transfer switch and the isolating switch.

[0061] The server 102 may 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.

[0062] like Figure 4 As shown, the embodiment of the present application provides a load splitting and power restoration method, which is applied to Figure 3 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:

[0063] Step S1, in response to the line fault self-healing restoration request of the distribution network, determine the first restoration switch and the isolating switch according to the electrical topological connection relationship of the distribution network and the opening and closing status of each automatic switch, and determine the area formed by the topological connection between the first restoration switch and the isolating switch as the area to be restored.

[0064] Among them, the automatic switches include outgoing line switches, section switches and contact switches.

[0065] When a line fault occurs in the distribution network, a request for self-healing and power restoration of the distribution network line fault 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.

[0066] 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.

[0067] 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.

[0068] 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.

[0069] 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 is achieved through the ordinary self-healing and power restoration strategy of the area to be restored, that is, the power restoration operation is performed on the area to be restored through the power restoration switch and the isolating switch.

[0070] Step S3: When it is determined that the outgoing line switch of the opposite line is overloaded, the load splitting path of the area to be restored is determined according to the electrical topology connection relationship of the distribution network. The load splitting path is the connection line from the isolating switch to the connecting switch, and the load splitting path includes multiple section switches.

[0071] The load splitting path is determined to reasonably split the load in the area to be restored and transfer it to other lines through the tie switch to avoid overloading the outgoing line switch of the opposite line. When determining the load splitting path, the system will consider the electrical topological connection relationship of the distribution network, especially the connection line between the isolating switch and the tie switch, which will constitute the load splitting path. In addition, the load splitting path will also include multiple segment switches, which are used to subdivide the area to be restored into different load line sections so as to accurately control the load in each section.

[0072] Step S4: Determine the load transfer switches corresponding to each segmented load line section in the area to be restored according to the load splitting path; wherein the load transfer switches are used to transfer the load of each segmented load line section.

[0073] Among them, the selection of load transfer switches is to transfer the load of the split load line section to other lines to ensure the stable operation of the distribution network. When determining the load transfer switch, the system will consider the load splitting path and the load conditions of each segmented load line section, and select a suitable contact switch as the load transfer switch to achieve accurate load transfer. The determination of the load transfer switch needs to consider not only the size and distribution of the load, but also the electrical topology connection relationship of the distribution network to ensure the feasibility and reliability of the transfer path.

[0074] Step S5: Re-energize the area to be re-energized through the load transfer switch and the isolating switch.

[0075] The power restoration operation is performed on the area to be restored to power through the load transfer switch and the isolating switch, including: the power restoration operation is performed on the area to be restored to power by opening all isolating switches and splitting switches and closing all second power restoration switches.

[0076] In practical applications, first of all, a series of switch operations need to be performed to ensure the safety and stability of the power system. The specific steps are as follows: First, all disconnectors should be opened to ensure that no unnecessary risks will be caused to the system during subsequent operations. Next, all load split switches should be opened. This step is to reasonably distribute and manage the loads in the power system. After completing the above steps, the contact switch of the priority power restoration scheme of the split load area should be closed to start the power restoration process. Next, check whether the power restoration operation is successful. If the remote control operation is found to be unsuccessful during the inspection, the backup power restoration scheme can be tried. In this case, the picture has not been tried to close the power restoration switch of the backup scheme to ensure the stable operation of the power system. The attempt will continue until all the areas to be restored are fully restored, or the operation will be stopped if there is no available scheme.

[0077] It should be noted that the embodiment of the present application responds to the line fault self-healing and power restoration request of the distribution network, identifies the first power restoration switch and the isolating switch according to the electrical topological connection relationship of the distribution network and the opening and closing status of each automatic switch, and determines a waiting power restoration area; by evaluating the load situation of the waiting power restoration area and the load of the outgoing line switch of the opposite line, it is judged whether the outgoing line switch has an overload risk. If an overload situation is detected, the power restoration operation will be performed on the waiting power restoration area through these load transfer switches and isolating switches according to the electrical topological relationship of the distribution network. The embodiment of the present application solves the problem that the load of the area to be restored by the fault line is too heavy or the original load of the opposite line is too large, thereby avoiding the locking of the self-healing program. In view of the problem that the load of the area to be restored by the fault line is too heavy or the original load of the opposite line is too large, which is common in the distribution network, the embodiment of the present application effectively reduces the scope of power outage, reduces the impact of power outage, and restores the power supply of the non-fault area as much as possible, thereby significantly improving the reliability of power supply in the distribution network.

[0078] In some embodiments, the step S1 determines the first power restoration switch and the isolating switch according to the electrical topological connection relationship of the distribution network and the opening and closing status of each automatic switch, and determines the area formed by the topological connection between the first power restoration switch and the isolating switch as the area to be restored, including:

[0079] Step S101: When a line fault occurs in the distribution network, the fault current signal is cut off by the outgoing line switch which is closest to the fault location and receives the fault current signal.

[0080] For example, Figure 5 As shown in the figure, the section current of the automatic switches CB1, CB2, CB3 and FB1~FB11 before the fault is recorded cyclically; the automation master station records the section current values ​​of all the above automatic switches according to the section current scanning cycle T1 (T1 cycle can be set); when the fault occurs, CB1, FB1, FB2 all feel the fault current signal, and the other automatic switches CB2, CB3 and FB3~FB11 do not feel it, and the outgoing line switch CB1 cuts off the fault current signal, and transmits the fault information and switch position to the master station system. Among them, the fault information includes key fault action information such as protection action, overcurrent action, grounding action, reclosing action, etc.

[0081] Step S102: According to the electrical topology connection relationship of the distribution network, the line between the automatic switch closest to the upstream of the fault location and the automatic switch closest to the downstream of the fault location is defined as the line fault section.

[0082] It is understandable that the line fault section 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 in electrical distance and has no fault signal is the downstream boundary switch. For example, Figure 5 As shown, the line fault section is the line between switches FB2 and FB3.

[0083] Step S103: According to the electrical topological connection relationship of the distribution network, an automatic switch electrically connected to the line fault section and connected to the tie switch / original power supply bus is determined as a candidate isolating switch.

[0084] Among them, the automatic switch that is electrically connected to the line in the line fault section and connected to the line, 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 all candidate isolation switches.

[0085] Step S104: according to the open and closed states of the candidate disconnectors, the candidate disconnectors in the closed state are used as disconnectors.

[0086] Step S105: The automatic switch connected to the isolating switch and the opposite power supply busbar / the original power supply busbar is used as a candidate power restoration switch;

[0087] Step S106, according to the on / off state of the candidate power restoration switch, taking the candidate power restoration switch in the separated state as the first power restoration switch;

[0088] Among them, when performing power system restoration operations, it is first necessary to connect the isolating switch to the opposite power supply bus or keep it connected to the original power supply bus, and regard these automatic switches as candidate power restoration switches; then, based on the open and close states of these candidate power restoration switches, a detailed inspection and analysis is carried out, and the switch in the closed state is selected from them, and this switch in the closed state is determined as the first power restoration switch, so as to carry out the next step of power system restoration work.

[0089] Step S107: determine the area where the isolating switch and the power restoration switch are directly electrically topologically connected as the area to be restored.

[0090] For example, Figure 5 As shown, FB2 and FB3 are used as isolation switches, and LB1, LB2, and LB3 are used as power restoration switches; the area formed between FB3 and the switches LB1, LB2, and LB3 is the power restoration area.

[0091] Among them, the area to be restored is the area covered by the electrical connection line between the isolating switch and the first restoration switch. The area to be restored is the area that needs to be restored through the load splitting restoration method. After determining the area to be restored, the system will determine whether it is necessary to split the load in the area to be restored based on the load conditions of the area and the load conditions of the outgoing line switch of the opposite line. If splitting is required, the system will further determine the load splitting path and the load transfer switch so that the split load can be transferred to other lines, thereby avoiding overloading of the outgoing line switch of the opposite line and ensuring the stable operation of the distribution network.

[0092] 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:

[0093] Step S201, determining 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;

[0094] 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.

[0095] 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.

[0096] 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.

[0097] Step S203: 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;

[0098] 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.

[0099] During the operation of the power system, if it is confirmed through evaluation that the outgoing line switch of the opposite line is not overloaded, the standard self-healing procedure should be followed for processing. The specific operation steps are: first, open the isolating switch to ensure safety in the subsequent steps. Then, close the power restoration switch to restore the non-faulty opposite line to the power supply state of its rated current area. After completing the above operations, the self-healing process can be declared over and the power system will return to normal operation. However, if it is found during the evaluation process that the outgoing line switch of the opposite line is overloaded, more detailed load reduction self-healing measures must be taken.

[0100] In some embodiments, the load of the area to be restored is carefully analyzed to determine whether the conditions for splitting are met. According to the topological structure of the line, it is detected whether there are multiple contact points in the area to be restored, and whether these contact points can effectively transfer the load of the same area to be restored. If the detection result shows that the area to be restored does not have multiple contact points to achieve the transfer of the same load, the subsequent self-healing procedure of load splitting can be terminated.

[0101] Specifically, the method also includes:

[0102] Step S21: judging whether the area to be restored has at least one tie switch for transferring power to the area to be restored, according to the electrical topological connection relationship of the distribution network.

[0103] Step S22: when it is determined that the area to be restored has at least one interconnecting switch that transfers power to the area to be restored, then continue to determine the load splitting path from the isolating switch to the interconnecting switch according to the electrical topological connection relationship of the distribution network;

[0104] Step S23: when it is determined that there is no at least one contact switch in the area to be restored that can transfer power to the area to be restored, the area to be restored is restored through the first restoration switch and the isolating switch.

[0105] Among them, if there is no at least one contact switch in the area to be restored for load transfer, it means that the load in the area to be restored cannot be shared by other lines. In this case, the system will directly use the existing first restoration switch and isolating switch to perform the restoration operation on the area to be restored. This step is taken when it is confirmed that the overload of the outgoing line switch on the opposite side cannot be avoided by load splitting, and aims to restore the power supply to the area to be restored as soon as possible. In actual operation, the system will control the relevant automatic switches and operate them in a predetermined order to ensure the safety and effectiveness of the restoration process. Through this step, even if the conditions for load splitting are not met, the area to be restored can still obtain timely power restoration, thereby reducing the impact of power outages on users.

[0106] In some embodiments, determining the load splitting path of the area to be restored to power according to the electrical topological connection relationship of the distribution network in step S3 includes:

[0107] Step S301: Determine multiple candidate load splitting paths according to the electrical topological connection relationship of the distribution network and the connection lines from the isolating switch to multiple tie switches.

[0108] Step S302: Filter out, from a plurality of candidate load splitting paths, a candidate load splitting path including the largest number of segment switches as the load splitting path.

[0109] For example, Figure 5 As shown in Figure 1, from the disconnector to multiple tie switches, multiple trunk paths are sorted out as candidate load splitting paths, and the path with the most segments is used as the load splitting path. If there are multiple paths with the same number of segment switches, one of them is randomly selected as the load splitting path. There are three candidate load splitting paths, and the three candidate load splitting paths are as follows: Figure 6a~Figure 6c As shown, Figure 6a The number of segment switches in the candidate load splitting path is 4. Figure 6b The number of segment switches in the candidate load splitting path is 6. Figure 6c The number of segment switches in the candidate load splitting path is 8, so choose Figure 6c The candidate load splitting paths in are used as the load splitting paths.

[0110] It is understandable that the determination of the load splitting path is not only related to the effective transfer of the load, but also directly affects the efficiency and safety of the power restoration operation. When screening the load splitting path, the system will give priority to the path with the largest number of segment switches. This is because a large number of segment switches means that the load can be split and managed more finely, which helps to more accurately control the load of each line, thereby avoiding overload. At the same time, multiple segment switches also provide more flexibility, allowing adjustments and optimizations to be made according to actual conditions during the power restoration process.

[0111] In some embodiments, the load transfer switch includes a second power restoration switch and a split switch;

[0112] Determining the load transfer switches corresponding to the respective section load line sections in the area to be restored to power according to the load splitting path in step S4 includes:

[0113] Step S401: sort the tie switches connected on the load splitting path from near to far according to their distance from the original power supply point.

[0114] Among them, sorting the interconnecting switches connected on the load splitting path from near to far according to their distance from the original power supply point helps to prioritize the restoration of loads closer to the power supply point and ensure rapid power restoration in key areas.

[0115] Step S402: determine the maximum transfer load of the tie switch in sequence according to the sorting result, and determine the corresponding section load transferred by the tie switch according to the maximum transfer load of the tie switch.

[0116] Among them, the maximum transfer load of the interconnecting switch determines the corresponding segmented load transferred by the interconnecting switch, that is, according to the load carrying capacity of each interconnecting switch, the load range that it can transfer is accurately matched to ensure reasonable load distribution and avoid power restoration delays or equipment overload risks caused by uneven load.

[0117] Step S403: Determine a segmented load line section consisting of a plurality of segmented switches that meet the segmented load according to the segmented load transferred by the tie switch.

[0118] Among them, the line sections are divided accurately according to the load-bearing capacity of each section switch to ensure that each section of the load line can operate stably, thereby improving the overall power restoration efficiency and system stability.

[0119] In general examples, the loads of multiple sectional switches contained in the sectional load line section need to maximize the requirements of the sectional load transferred by the tie switch to ensure optimal load distribution. In this way, not only can the speed of power restoration be effectively improved, but also the risk of equipment damage caused by improper load distribution can be significantly reduced, ensuring the overall safety and reliability of power grid operation.

[0120] Step S404: Use the tie switch corresponding to the segmented load line section as the second power restoration switch, and use the segment switches at both ends of the segmented load line section as split switches;

[0121] Step S405, update the next interconnecting switch, and based on the updated interconnecting switch, repeat the steps of determining the maximum transfer load of the interconnecting switch in sequence according to the sorting result, and determining the corresponding segmented load transferred by the interconnecting switch according to the maximum transfer load of the interconnecting switch, until all segmented switches in the area to be restored to power are transferred by the load transfer switch.

[0122] For example, Figure 7 As shown, the load capacity of the contact switch LB3 is 450-350=150A. After verification, LB3 can only transfer the load between FB3-FB8. Therefore, FB3 and FB8 are listed as split switches, and the contact switch LB3 is used as the power restoration switch for the load between FB3-FB8.

[0123] The interconnecting switch LB2 is analyzed and its load capacity is 550-400=150A. After verification, LB2 can transfer the load between FB8 and FB10. FB8 and FB10 are listed as split switches, and the interconnecting switch LB2 is used as the power restoration switch for the load between FB8 and FB10.

[0124] The tie switch LB1 is analyzed. The load capacity of the tie switch LB1 is 480-300=180A. After verification, the tie switch LB1 can transfer the load between FB11-LB1. LB1 is listed as a split switch, but because LB1 is both a tie switch and a split switch, LB1 is only processed as a tie switch, not a split switch. In this way, the load distribution of each tie switch is ensured to be accurate, repeated processing is avoided, and the efficiency and accuracy of the power restoration operation are improved. In the subsequent steps, similar analysis will continue to be performed on the remaining tie switches to ensure that the load distribution of each segmented load line interval is reasonable and to avoid waste of resources. Through step-by-step optimization, the load balance of the entire network is finally achieved, the power restoration efficiency is improved, and the stable operation of the power grid is guaranteed.

[0125] Based on the same inventive concept, an embodiment of the present application also provides a load splitting and power restoration system for implementing the load splitting and power restoration method involved above.

[0126] 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 splitting and power restoration system embodiments provided below can refer to the limitations on the load splitting and power restoration method above, and will not be repeated here.

[0127] like Figure 8 As shown, an embodiment of the present application provides a load splitting and power restoration system, including:

[0128] The module 100 for determining the area to be restored is used to respond to the request for self-healing restoration of power due to line faults in the distribution network, determine the first restoration switch and the isolation switch according to the electrical topological connection relationship of the distribution network and the opening and closing status of each automatic switch, and determine the area formed by the topological connection between the first restoration switch and the isolation switch as the area to be restored;

[0129] 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;

[0130] The splitting path determination module 300 is used to determine the load splitting path of the area to be restored to power according to the electrical topological connection relationship of the distribution network when it is determined that the outgoing line switch of the opposite line is overloaded. The load splitting path is the connection line from the isolating switch to the tie switch, and the load splitting path includes multiple segment switches;

[0131] The transfer switch determination module 400 is used to determine the load transfer switches corresponding to each segmented load line section in the area to be restored according to the load splitting path; wherein the load transfer switch is used to transfer the load of each segmented load line section;

[0132] The power restoration operation module 500 is used to restore power to the area to be restored power through the load transfer switch and the isolation switch.

[0133] like Fig. 9 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 stores a computer program, and when the computer program is executed by the processor, the processor executes the steps of the load splitting and power restoration method as in any of the above embodiments.

[0134] 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 splitting and power restoration method as in any of the above embodiments are implemented.

[0135] 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.

[0136] It should be noted that the terms "first", "second", etc. in the specification and claims of the present invention and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged where appropriate, so that the embodiments of the present invention described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units that are clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0137] 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 the module, a program segment or a part of a code contains 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.

[0138] 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 the units is only a logical function division. There may be other division methods in actual implementation, such as 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.

[0139] 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.

[0140] 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.

[0141] 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.

[0142] 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 splitting and 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 first power restoration switch and a disconnecting switch are determined according to the electrical topological connection relationship of the distribution network and the opening and closing status of each automatic switch, and an area formed by the topological connection between the first power restoration switch and the disconnecting switch is determined as a waiting power restoration area; 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 splitting path of the area to be restored is determined according to the electrical topological connection relationship of the distribution network, the load splitting path is the connection line from the isolating switch to the tie switch, and the load splitting path includes a plurality of segment switches; Determine the load transfer switches corresponding to each segmented load line section in the area to be restored according to the load splitting path; wherein the load transfer switches are used to transfer the load of each segmented load line section; The power restoration operation is performed on the area to be restored to power through the load transfer switch and the isolation switch.

2. The load splitting and power restoration method according to claim 1, characterized in that: According to the electrical topological connection relationship of the distribution network and the opening and closing states of each automatic switch, a first power restoration switch and an isolating switch are determined, and according to the area formed by the topological connection between the first power restoration switch and the isolating switch, an area to be restored to power is determined, including: When a line fault occurs in the distribution network, the fault current signal is cut off by 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, the line between the automatic switch closest to the upstream of the fault location and the automatic switch closest to the downstream of the fault location is the line fault section; According to the electrical topological connection relationship of the distribution network, determine the automatic switch electrically connected to the line fault section and connected to the tie switch / 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; The automatic switch connecting the isolating switch to the opposite power supply busbar / the original power supply busbar is used as a candidate power restoration switch; 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 first power restoration switch; The area where the isolating switch and the power restoration switch are directly electrically topologically connected is determined as the power restoration area.

3. The load splitting and power restoration method according to claim 1, 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.

4. The load splitting and power restoration method according to claim 1, characterized in that: Also includes: According to the electrical topological connection relationship of the distribution network, it is determined whether the area to be restored to power has at least one tie switch for transferring power to the area to be restored to power; When it is determined that the area to be restored has at least one connecting switch for transferring power to the area to be restored, the step of continuing to determine the load splitting path from the isolating switch to the connecting switch according to the electrical topological connection relationship of the distribution network; When it is determined that there is no at least one contact switch in the area to be restored to power that switches power to the area to be restored to power, the area to be restored to power is restored to power through the first restoration switch and the isolation switch.

5. The load splitting and power restoration method according to claim 1, characterized in that: Determining a load splitting path of the area to be restored to power according to the electrical topological connection relationship of the distribution network includes: Determine multiple candidate load splitting paths according to the electrical topological connection relationship of the distribution network and the connection lines between the isolation switch and multiple tie switches; According to the plurality of candidate load splitting paths, a candidate load splitting path including the largest number of segment switches is selected as the load splitting path.

6. The load splitting and power restoration method according to claim 1, characterized in that: The load transfer switch includes a second power restoration switch and a split switch; The step of determining the load transfer switches corresponding to the respective segmented load line sections in the area to be restored to power according to the load splitting path includes: Sort the tie switches connected on the load splitting path from near to far according to their distance from the original power supply point; Determine the maximum transfer load of the tie switch in sequence according to the sorting results, and determine the corresponding section load transferred by the tie switch according to the maximum transfer load of the tie switch; According to the sectional load transferred by the contact switch, a sectional load line section composed of a plurality of sectional switches satisfying the sectional load is determined; The tie switch corresponding to the segmented load line section is used as the second power restoration switch, and the segment switches at both ends of the segmented load line section are used as split switches; Update the next contact switch, and based on the updated contact switch, repeat the steps of determining the maximum transfer load of the contact switch in sequence according to the sorting results, and determining the corresponding segmented load transferred by the contact switch according to the maximum transfer load of the contact switch, until all segmented switches in the area to be restored are transferred by the load transfer switch.

7. The load splitting and power restoration method according to claim 6, characterized in that: The operation of restoring power to the area to be restored to power by using the load transfer switch and the isolating switch includes: The power restoration operation is performed on the area to be restored by opening all the isolating switches and the splitting switches and closing all the second power restoration switches.

8. A load splitting and power restoration system, characterized in that: include: A module for determining a waiting-for-power-restore area, for responding to a request for self-healing power restoration of a line fault in a distribution network, determining a first power restoration switch and a disconnecting switch according to an electrical topological connection relationship of the distribution network and an opening and closing state of each automatic switch, and determining an area formed by a topological connection between the first power restoration switch and the disconnecting switch as a waiting-for-power-restore area; 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 splitting path determination module is used to determine the load splitting path of the area to be restored to power according to the electrical topological connection relationship of the distribution network when it is determined that the outgoing line switch of the opposite line is overloaded, wherein the load splitting path is the connection line from the isolating switch to the tie switch, and the load splitting path includes a plurality of segment switches; A transfer switch determination module is used to determine the load transfer switches corresponding to each segmented load line section in the area to be restored according to the load splitting path; wherein the load transfer switch is used to transfer the load of each segmented load line section; A power restoration operation module is used to restore power to the area to be restored through the load transfer switch and the isolation switch.

9. 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 splitting and power restoration method as described in any one of claims 1-7.

10. 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 splitting and power restoration method as described in any one of claims 1 to 7 are implemented.

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