A load splitting and power restoration method, system, device and medium

Abstract

This invention relates to power system restoration technology, and discloses a load splitting restoration method, system, equipment, and medium. The method responds to a self-healing restoration request from a distribution network line fault, identifies restoration switches and disconnect switches, and determines the area to be restored. It assesses the load in the area to be restored and the load of the outgoing switches on the opposite line to determine if there is an overload risk. If an overload is detected, restoration is performed through load transfer switches and disconnect switches based on the electrical topology. This invention solves the problem of insufficient load transfer in the area to be restored due to excessive load on the faulty line or excessive original load on the opposite line, thus avoiding self-healing program lockout. Addressing the issue of excessive load in the area to be restored due to a faulty line or excessive original load on the opposite line, this invention effectively reduces the outage area and impact through a load splitting self-healing restoration strategy, restoring power to non-faulty areas as much as possible and significantly improving the reliability of the distribution network.

Description

Technical Field

[0001] This invention relates to the field of power system restoration technology, and in particular to a load splitting and restoration method, system, equipment and medium. Background Technology

[0002] In recent years, technologies such as distribution self-healing, feeder automation (FA), and programmed operation have developed rapidly and are widely used for the rapid restoration of power supply after distribution line faults. Currently, in most cases, both self-healing technologies and programmed operations prioritize power supply reliability, primarily focusing on the overall restoration of loads in non-faulty areas. However, in daily operation, due to issues such as heavy overall loads on some faulty lines and weak load-carrying capacity of the opposite lines, it is impossible to achieve overall restoration of loads in non-faulty areas. Therefore, in such situations, distribution self-healing, feeder automation (FA), and programmed operation procedures typically only employ a locked-in approach. For example: Figure 1 As shown, when a fault occurs between sectionalizing switches FB2 and FB3, under normal circumstances, the power distribution self-healing, feeder automation (FA), and programmed operation procedures will disconnect sectionalizing switches FB2 and FB3 to isolate the faulty area. Then, depending on the specific load conditions, one of the tie switches LB1, LB2, and LB3 will be closed to restore the load power supply to the non-faulty area as a whole.

[0003] like Figure 2 As shown, if the non-faulty area (the line between FB3 and LB1 / LB2 / LB3) has a heavy load, and the original load on the opposite line is large or its load-carrying capacity is insufficient, the self-healing mechanism can only choose not to operate or block it to avoid secondary faults caused by overload after self-healing power transfer, which would lead to an expansion of the power outage area. In this case, the self-healing function is difficult to play, and it is difficult to directly transfer all the load in the non-faulty area to the opposite line, resulting in the self-healing procedure being blocked. It is also difficult to quickly restore power supply to the load in the non-faulty area, leading to an expansion of the power outage area 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-faulty loads to the opposite line, resulting in the self-healing program being blocked, making it difficult to quickly restore power supply to non-faulty loads, leading to an expansion of the power outage area and poor power supply reliability of the line.

[0005] The first aspect of this invention provides a load splitting and power restoration method, comprising:

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

[0007] Determine whether the outgoing switch of the opposite line is overloaded based on the load of the area to be restored and the load of the outgoing switch of the opposite line.

[0008] When it is determined 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 topology of the distribution network. The load splitting path is the connection line from the disconnecting switch to the tie switch, and the load splitting path includes multiple sectionalizing switches.

[0009] Based on the load splitting path, determine the load transfer switches corresponding to each segment of the load line section within the area to be restored; wherein, the load transfer switches are used to transfer the load of each segment of the load line section;

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

[0011] Preferably, based on the electrical topology of the power distribution network and the open / closed states of each automated switch, a first power restoration switch and a disconnecting switch are determined, and the area formed by the topological connection between the first power restoration switch and the disconnecting switch is determined as the area to be restored, including:

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

[0013] Based on the electrical topology of the power distribution network, the line fault section is defined as the line between the nearest upstream automatic switch and the nearest downstream automatic switch at the fault location.

[0014] Based on the electrical topology of the power distribution network, an automated switch that is electrically connected to the fault section of the line and connected to the tie switch / original power supply bus is identified as a candidate disconnect switch.

[0015] Based on the open / closed state of the candidate disconnecting switches, the candidate disconnecting switches in the closed state are selected as disconnecting switches.

[0016] The automated switch connecting the disconnecting switch to the opposite power supply bus / original power supply bus is considered as a candidate power restoration switch;

[0017] Based on the open / closed state of the candidate power-on switch, the candidate power-on switch in the closed state is taken as the first power-on switch;

[0018] The area where the disconnecting switch and the re-energizing switch are directly electrically connected is defined as the area to be re-energized.

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

[0020] The restoration load current of the area to be restored is determined based on the load current of all disconnect switches in the area to be restored and the load current of the outgoing switches on the opposite side of the line before the fault.

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

[0022] When it is determined that the recovery 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 switch of the opposite line is overloaded.

[0023] When it is determined that the restoration 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 switch of the opposite line is not overloaded.

[0024] Preferably, the method further includes:

[0025] Based on the electrical topology of the power distribution network, determine whether the area to be restored has at least one interconnecting switch that transfers power to the area to be restored;

[0026] When it is determined that there is at least one tie switch that transfers power to the area to be restored, the process of determining the load splitting path from the disconnect switch to the tie switch based on the electrical topology of the power distribution network continues.

[0027] When it is determined that there is no at least one connecting switch that transfers power to the area to be restored, the area to be restored is powered through the first power restoration switch and the disconnecting switch.

[0028] Preferably, determining the load splitting path for the area to be restored based on the electrical topology of the distribution network includes:

[0029] Based on the electrical topology of the power distribution network and the connection lines from the disconnecting switch to multiple tie switches, multiple candidate load splitting paths are determined.

[0030] Based on the multiple candidate load splitting paths, the candidate load splitting path containing the most segmented 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 each segment of the load line section within the area to be restored based on the load splitting path includes:

[0033] The interconnecting switches connected to the load splitting path are sorted from closest to furthest from the original power supply point.

[0034] The maximum load transfer capacity of the tie switch is determined sequentially based on the sorting results, and the segmented load corresponding to the tie switch is determined based on the maximum load transfer capacity of the tie switch.

[0035] Based on the segmented loads supplied by the interconnecting switches, determine the segmented load line section composed of multiple segmented switches that satisfy the segmented loads;

[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 tie switch, and based on the updated tie switch, repeat the steps of determining the maximum load transfer capacity of the tie switch according to the sorting result, and determining the segmented load corresponding to the tie switch according to the maximum load transfer capacity of the tie switch, until all segmented switches in the area to be restored are transferred by the load transfer switch.

[0038] Preferably, the step of restoring power to the area to be restored via the load transfer switch and the disconnect switch includes:

[0039] The power-on operation is performed on the area to be restored by opening all the disconnect switches and the split switches, and closing all the second power-on switches.

[0040] Secondly, the present invention also provides a load splitting and power restoration system, comprising:

[0041] The power restoration zone determination module is used to respond to the power restoration request of the distribution network for line fault self-healing. Based on the electrical topology connection relationship of the distribution network and the opening and closing status of each automatic switch, it determines the first power restoration switch and the disconnecting switch, and determines the area formed by the topological connection between the first power restoration switch and the disconnecting switch as the power restoration zone.

[0042] The overload detection module is used to determine whether the outgoing switch of the opposite line is overloaded based on the load of the area to be restored and the load of the outgoing switch of the opposite line.

[0043] The load splitting path determination module is used to determine the load splitting path of the area to be restored based on the electrical topology of the distribution network when it is determined that the outgoing switch of the opposite line is overloaded. The load splitting path is the connection line from the disconnecting switch to the tie switch, and the load splitting path includes multiple sectionalizing switches.

[0044] The load transfer switch determination module is used to determine the load transfer switches corresponding to each segment of the load line section within the area to be restored, based on the load splitting path; wherein, the load transfer switches are used to transfer the load of each segment of the load line section.

[0045] The power restoration operation module is used to perform power restoration operation on the area to be restored through the load transfer switch and the disconnect switch.

[0046] Thirdly, the present invention also provides an electronic device, the electronic device including a memory and a processor, the memory storing a computer program, the computer program being executed by the processor causing the processor to perform the steps of the load splitting and power restoration method as described in the first aspect.

[0047] Fourthly, the present invention also provides a computer-readable storage medium having a computer program stored thereon, which, when executed, implements the steps of the load splitting and power restoration method as described in the first aspect.

[0048] As can be seen from the above technical solutions, this invention responds to the self-healing power restoration request of a distribution network line fault. Based on the electrical topology of the distribution network and the opening and closing status of each automatic switch, it identifies the first power restoration switch and the disconnecting switch to determine a power restoration area. By assessing the load of the power restoration area and the load of the outgoing switches on the opposite line, it determines whether the outgoing switches have an overload risk. If an overload is detected, the power restoration operation is performed on the power restoration area through these load transfer switches and disconnecting switches according to the electrical topology of the distribution network. This invention solves the problem that it is impossible to transfer all the load of the non-faulty area to the opposite line due to excessive load in the power restoration area of ​​the faulty line or excessive original load of the opposite line, thereby avoiding the blocking of the self-healing procedure. Addressing the common problem in distribution networks of excessive load in the power restoration area of ​​the faulty line or excessive original load of the opposite line, this invention effectively reduces the scope of the power outage and the impact of the power outage through a load splitting self-healing power restoration strategy, and restores power to non-faulty areas as much as possible, thereby significantly improving the reliability of the distribution network power supply. Attached Figure Description

[0049] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

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

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

[0052] Figure 3 This invention provides an application environment for a load splitting and power restoration method according to an embodiment of the invention.

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

[0054] Figure 5 A schematic diagram of self-healing and power transfer in the fault area under heavy load conditions of a faulty line;

[0055] Figures 6a-6c These are schematic diagrams showing the load splitting paths for different sectionalizing switches;

[0056] Figure 7 The diagram shows the load splitting scheme and switch diagram for the area awaiting power restoration;

[0057] Figure 8 This is a schematic diagram of a load splitting and reconnection system provided in an embodiment of the present invention;

[0058] Figure 9 This is a schematic diagram of the structure of an electronic device provided in an embodiment of the present invention. Detailed Implementation

[0059] To enable those skilled in the art to better understand the present invention, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0060] The load splitting and power restoration method provided in this application embodiment can be applied to, for example... Figure 3The application environment shown depicts a power distribution network communicating with server 102 via a network. A data storage system can store the data that server 102 needs to process. The data storage system can be integrated onto server 102 or hosted on a cloud or other network server. Server 102, in response to a line fault self-healing power restoration request from the distribution network, determines the first power restoration switch and the disconnecting switch based on the electrical topology of the distribution network and the opening / closing status of each automated switch. It then defines the area to be restored as the region formed by the topological connection between the first power restoration switch and the disconnecting switch. Based on the load of the region to be restored and the load of the outgoing switches on the opposite line, it determines whether the outgoing switches on the opposite line are overloaded. If the outgoing switches on the opposite line are overloaded, it determines the load splitting path for the region to be restored based on the electrical topology of the distribution network. The load splitting path is the connection line from the disconnecting switch to the tie switch, and it includes multiple segment switches. Based on the load splitting path, it determines the load transfer switches corresponding to each segment load line section within the region to be restored. The load transfer switches are used to transfer the load of each segment load line section. Finally, it performs the power restoration operation on the region to be restored using the load transfer switches and the disconnecting switches.

[0061] Server 102 can be a standalone physical server, a server cluster or distributed system consisting of multiple physical servers, or a cloud server that provides cloud computing services.

[0062] like Figure 4 As shown in the embodiments of this application, a load splitting and power restoration method is provided, which is applied to... Figure 3 Taking server 102 as an example, the explanation includes the following steps S1 to S5. Wherein:

[0063] Step S1: In response to the self-healing power restoration request of the distribution network line fault, determine the first power restoration switch and the disconnecting switch according to the electrical topology connection relationship of the distribution network and the opening and closing status of each automatic switch, and determine the area to be restored according to the topology connection between the first power restoration switch and the disconnecting switch.

[0064] Among them, automatic switches include outgoing line switches, sectionalizing switches, and tie switches.

[0065] When a fault occurs in a distribution network line, a self-healing power restoration request for the distribution network line fault is generated, and the electrical topology connection relationship of the distribution network and the opening and closing status of each automatic switch are obtained through the automation master station system.

[0066] In practical applications, by setting the protection tripping start time and protection current settings for each automatic switch, the protection alarm and protection tripping functions of the automatic switches can be enabled, selectively enabling the automatic switches to activate protection alarms or protection tripping functions. In a typical example, each feeder is set with a 0.3-second time difference. The breaking time of other automatic switches on the feeder needs to be around 50ms to 100ms, depending on the switch performance. If only 2 to 3 more time differences can be set, such as 0.15-second tripping or 0-second tripping, the remaining automatic switches can only be configured with overcurrent alarms.

[0067] The area to be restored is determined by setting up restoration switches and disconnect switches using a common self-healing restoration strategy, and by the topological connection relationship between the restoration switches and disconnect switches.

[0068] Step S2: Determine whether the outgoing switch of the opposite line is overloaded based on the load of the area to be restored and the load of the outgoing switch of the opposite line.

[0069] Understandably, it is necessary to determine whether the load of the area to be restored will cause an overload of the outgoing switch on the opposite line. If the outgoing switch on the opposite line is overloaded, load reduction self-healing is required. If the outgoing switch on the opposite line is not overloaded, load reduction self-healing is not required, and the self-healing restoration operation is achieved through the normal self-healing restoration strategy of the area to be restored, that is, by restoring the area to be restored through the restoration switch and the isolating switch.

[0070] Step S3: When it is determined 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 topology connection relationship of the distribution network. The load splitting path is the connection line from the disconnecting switch to the tie switch, and the load splitting path includes multiple sectional switches.

[0071] The determination of load splitting paths aims to rationally distribute the load in the area to be restored and transfer it to other lines via tie switches, thereby preventing overload of the outgoing switches on the opposite lines. When determining load splitting paths, the system considers the electrical topology of the distribution network, particularly the connecting lines between disconnect switches and tie switches; these lines constitute the load splitting paths. Furthermore, the load splitting paths also include multiple sectionalizing switches, which are used to subdivide the area to be restored into different load line sections for precise load control in each section.

[0072] Step S4: Determine the load transfer switches corresponding to each segment of the load line section within the area to be restored based on the load splitting path; wherein, the load transfer switches are used to transfer the load of each segment of the load line section.

[0073] The selection of load transfer switches is crucial for transferring the load from split load line sections to other lines, ensuring the stable operation of the distribution network. When determining the load transfer switch, the system considers the load splitting path and the load conditions of each segmented load line section, selecting a suitable tie switch to achieve accurate load transfer. The determination of the load transfer switch requires consideration not only of the load size and distribution but also of the electrical topology of the distribution network to ensure the feasibility and reliability of the transfer path.

[0074] Step S5: Perform power restoration operation on the area to be restored using the load transfer switch and disconnect switch.

[0075] The process of restoring power to the area to be restored via load transfer switches and disconnect switches includes: opening all disconnect switches and disconnecting switches, and closing all second power restoration switches to restore power to the area to be restored.

[0076] In practical applications, a series of switching operations are first required to ensure the safety and stability of the power system. The specific steps are as follows: First, all isolating switches must be opened to ensure that subsequent operations do not pose unnecessary risks to the system. Next, all load splitting switches must be opened to rationally distribute and manage the loads in the power system. After completing the above steps, the tie switch for the priority power restoration scheme of the split load area must be closed to initiate the power restoration process. Then, the success of the power restoration operation is checked. If the remote control operation fails during the check, the backup power restoration scheme can be tried. In this case, the backup power restoration switch is tried to close to ensure the stable operation of the power system. Attempts will continue until all areas to be restored are powered, or until no alternative scheme is available, at which point the operation is stopped.

[0077] It should be noted that, in response to a self-healing power restoration request from a distribution network line fault, this embodiment identifies a first power restoration switch and a disconnecting switch based on the electrical topology of the distribution network and the opening / closing status of each automated switch, thus determining a power restoration area. The load condition of the area to be restored and the load of the outgoing switches on the opposite line are assessed to determine if there is an overload risk. If an overload is detected, power restoration is performed on the area to be restored based on the electrical topology of the distribution network through these load transfer switches and disconnecting switches. This embodiment solves the problem that the load of the area to be restored from the faulty line is too heavy or the original load of the opposite line is too large, making it impossible to transfer all the load of the non-faulty area to the opposite line, thereby avoiding the blocking of the self-healing procedure. Addressing the common problem in distribution networks of excessive load in the area to be restored from the faulty line or excessive original load of the opposite line, this embodiment effectively reduces the power outage range and minimizes the impact of the power outage through a load splitting self-healing power restoration strategy, restoring power to non-faulty areas as much as possible, thereby significantly improving the reliability of the distribution network power supply.

[0078] In some embodiments, step S1 involves determining the first power restoration switch and the disconnecting switch based on the electrical topology of the power distribution network and the opening / closing status of each automated switch, and determining the area to be restored based on the topological connection between the first power restoration switch and the disconnecting switch, including:

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

[0080] For example, such as Figure 5 As shown, the current at the cross-sections of automated switches CB1, CB2, CB3, and FB1~FB11 before a fault is recorded cyclically. The automated master station records the current values ​​at the cross-sections of all the aforementioned automated switches according to a cross-section current scanning cycle T1 (the T1 cycle is adjustable). When a fault occurs, CB1, FB1, and FB2 all sense the fault current signal, while the remaining automated switches CB2, CB3, and FB3~FB11 do not sense it. The outgoing switch CB1 cuts off the fault current signal and transmits the fault information and switch position to the master station system. The fault information includes key fault action information such as protection actions, overcurrent actions, grounding actions, and reclosing actions.

[0081] Step S102: Based on the electrical topology of the distribution network, the line fault section is defined as the line between the nearest upstream automatic switch and the nearest downstream automatic switch at the fault location.

[0082] Understandably, a line fault zone consists of automated switches capable of transmitting fault information. The switch closest upstream of the fault location can sense the fault current; this is the upstream boundary switch. The downstream switch, closest in electrical distance to the upstream boundary and without a fault signal, is the downstream boundary switch. For example, such as... Figure 5 As shown, the faulty section is the line between switches FB2 and FB3.

[0083] Step S103: Based on the electrical topology of the distribution network, determine the automatic switches that are electrically connected to the fault section of the line and connected to the tie switch / original power supply bus as candidate disconnect switches.

[0084] Among them, the automatic switches that are electrically connected to the line fault section and connected to the automatic switches that are electrically connected to the line fault section and connected to the original power supply bus are all considered as candidate disconnect switches.

[0085] Step S104: Based on the open / closed state of the candidate disconnecting switch, select the candidate disconnecting switch in the closed state as the disconnecting switch.

[0086] Step S105: Select the automated switch connecting the isolating switch to the opposite power supply bus / original power supply bus as a candidate power restoration switch;

[0087] Step S106: Based on the open / closed state of the candidate power restoration switch, the candidate power restoration switch in the open state is taken as the first power restoration switch;

[0088] In the process of power system restoration, the first step is to connect the disconnecting switch to the opposite power supply bus or maintain its connection with the original power supply bus. These automated switches are considered as candidate power restoration switches. Subsequently, a detailed inspection and analysis is conducted based on the open and closed states of these candidate power restoration switches. The switch in the closed state is selected as the first power restoration switch so that the next step of power system restoration can be carried out.

[0089] Step S107: The area where the disconnecting switch and the re-energizing switch are directly electrically connected is defined as the area to be re-energized.

[0090] For example, such as Figure 5 As shown, FB2 and FB3 are used as disconnecting switches, and LB1, LB2, and LB3 are used as re-energizing switches; the area formed between FB3 and switches LB1, LB2, and LB3 is the area to be re-energized.

[0091] The area to be restored is the region covered by the electrical connection line between the disconnecting switch and the first restoration switch. This area requires restoration via load splitting. After identifying the area, the system determines whether load splitting is necessary based on the load conditions of that area and the load conditions of the outgoing switches on the opposite line. If splitting is required, the system further determines the load splitting path and load transfer switches to transfer the split load to other lines, thereby preventing overload of the outgoing switches on the opposite line and ensuring the stable operation of the distribution network.

[0092] In some embodiments, step S2, determining whether the outgoing switch of the opposite line is overloaded based on the load of the area to be restored and the load of the outgoing switch of the opposite line, includes:

[0093] Step S201: Determine the restoration load current of the area to be restored based on the load current of all disconnect switches in the area to be restored and the load current of the outgoing switches on the opposite side of the line before the fault.

[0094] The load of the area to be restored is estimated by using the cross-sectional buffer current of the disconnecting switch before the fault. The load of the area to be restored is then added to the load of the outgoing switch on the opposite side. That is, the sum of the load current of all disconnecting switches in the area to be restored and the load current of the outgoing switch on the opposite side before the fault is used to determine the restoration load current of the area to be restored.

[0095] Step S202: Determine whether the restoration load current of the area to be restored is greater than the preset rated current of the opposite line.

[0096] Specifically, the restoration load current of the area to be energized is compared to see if it exceeds the rated load value of the outgoing switch on the opposite side, i.e., whether the restoration load current of the area to be energized is greater than the preset rated current of the opposite line.

[0097] Step S203: When it is determined that the restoration 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 switch of the opposite line is overloaded.

[0098] Step S204: When it is determined that the restoration 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 switch of the opposite line is not overloaded.

[0099] During power system operation, if an assessment confirms that the outgoing switch on the opposite line is not overloaded, the standard self-healing procedure should be followed. The specific steps are as follows: First, open the isolating switch to ensure safety in subsequent steps. Then, close the re-energizing switch to restore the non-faulty opposite line to its rated current range. After completing these steps, the self-healing process is considered complete, and the power system will return to normal operation. However, if an overload is found on the outgoing switch of the opposite line during the assessment, more detailed load reduction self-healing measures must be taken.

[0100] In some embodiments, a detailed analysis of the load in the area to be restored is performed to determine whether the conditions for load splitting are met. Based on the line topology, it is detected whether multiple connection points exist in the area to be restored, and whether these connection points can effectively transfer the load to the same area. If the detection results indicate that the area to be restored does not have multiple connection points to transfer the same load, the subsequent load splitting self-healing procedure can be terminated.

[0101] Specifically, this method also includes:

[0102] Step S21: Based on the electrical topology of the distribution network, determine whether the area to be restored has at least one interconnecting switch that transfers power to the area to be restored.

[0103] Step S22: When it is determined that there is at least one tie switch that transfers power to the area to be restored, continue to determine the load splitting path from the disconnect switch to the tie switch based on the electrical topology of the distribution network.

[0104] Step S23: When it is determined that there is no at least one connecting switch in the area to be restored that is transferring power to the area to be restored, the power restoration operation is performed on the area to be restored through the first power restoration switch and the isolating switch.

[0105] If the area awaiting power restoration lacks at least one tie switch for load transfer, it indicates that the load in that area cannot be shared through other lines. In this case, the system will directly utilize the existing first power restoration switch and isolating switch to perform power restoration operations on the area. This step is taken when it is confirmed that overloading of the outgoing switches on the opposite line cannot be avoided through load splitting, aiming to restore power to the area as quickly as possible. In actual operation, the system controls the relevant automated switches to operate in a predetermined sequence to ensure the safety and effectiveness of the power restoration process. Through this step, even without the conditions for load splitting, the area awaiting power restoration can still receive timely power restoration, thereby reducing the impact of power outages on users.

[0106] In some embodiments, step S3, determining the load splitting path for the area to be restored based on the electrical topology of the distribution network, includes:

[0107] Step S301: Based on the electrical topology of the distribution network, determine multiple candidate load splitting paths according to the connection lines from the disconnecting switch to multiple tie switches.

[0108] Step S302: Select the candidate load splitting path that contains the most segmented switches from multiple candidate load splitting paths as the load splitting path.

[0109] For example, such as Figure 5 As shown, multiple trunk paths are identified from the disconnecting switch to several tie switches as candidate load splitting paths. The path with the most segments is selected as the load splitting path. If multiple paths have the same number of segment switches, one of them is randomly selected as the load splitting path. There are three candidate load splitting paths, as shown below. Figures 6a-6c As shown, where, Figure 6a The number of segment switches for the candidate load splitting path is 4. Figure 6b The number of segment switches for the candidate load splitting path is 6. Figure 6c If the number of segment switches for the candidate load splitting path is 8, then select... Figure 6c The candidate load splitting paths are used as load splitting paths.

[0110] Understandably, determining the load splitting path is crucial not only for the effective transfer of load but also for the efficiency and safety of power restoration operations. When selecting load splitting paths, the system prioritizes the path with the highest number of sectionalizing switches. This is because a larger number of sectionalizing switches means the load can be split and managed more precisely, facilitating more accurate control of the load on each line and preventing overload situations. Furthermore, multiple sectionalizing switches provide greater flexibility, allowing for adjustments and optimizations based on actual conditions during power restoration.

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

[0112] Step S4, which involves determining the load transfer switches corresponding to each segment of the load line within the area to be restored based on the load splitting path, includes:

[0113] Step S401: Sort the interconnecting switches connected to the load splitting path from the nearest to the farthest from the original power supply point.

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

[0115] Step S402: Determine the maximum load transfer capacity of the tie switch according to the sorting results, and determine the segment load corresponding to the tie switch based on the maximum load transfer capacity of the tie switch.

[0116] Among them, the maximum load capacity of the tie switch determines the segmented load that the tie switch is responsible for supplying. That is, based on the load carrying capacity of each tie switch, the load range that it can supply is precisely matched to ensure reasonable load distribution and avoid the risk of power restoration delay or equipment overload caused by uneven load.

[0117] Step S403: Based on the segmented loads supplied by the tie switches, determine the segmented load line section composed of multiple segmented switches that meet the segmented load requirements.

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

[0119] In a typical example, the load of multiple sectionalizing switches within a segmented load line section needs to be maximized to meet the requirements of the segmented loads transferred by the tie switches, ensuring optimal load allocation. This approach not only effectively improves power restoration speed but also significantly reduces the risk of equipment damage due to improper load allocation, ensuring the overall safety and reliability of the 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 tie switch, and based on the updated tie switch, repeat the steps of determining the maximum load transfer capacity of the tie switch according to the sorting result, and determining the segment load corresponding to the tie switch according to the maximum load transfer capacity of the tie switch, until all segment switches in the area to be restored are transferred by the load transfer switch.

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

[0123] Analyzing the tie switch LB2, its load capacity is 550-400=150A. After verification, LB2 can supply the load between FB8 and FB10. FB8 and FB10 are listed as split switches, and tie switch LB2 acts as a recirculation switch for the load between FB8 and FB10.

[0124] Analyzing tie switch LB1, its load capacity is 480-300=180A. After verification, tie switch LB1 can supply the load between FB11 and LB1. LB1 is listed as a split switch, but since LB1 is both a tie switch and a split switch, it is only treated as a tie switch, not a split switch. This method ensures accurate load allocation for each tie switch, avoids redundant processing, and improves the efficiency and accuracy of power restoration operations. In subsequent steps, similar analysis is performed on the remaining tie switches to ensure reasonable load allocation between each segment of the load line and avoid resource waste. Through step-by-step optimization, overall network load balance is ultimately achieved, power restoration efficiency is improved, and stable grid operation is guaranteed.

[0125] Based on the same inventive concept, this application also provides a load splitting and power restoration system for implementing the load splitting and power restoration method described above.

[0126] The solution provided by this system is similar to the solution described in the above method. Therefore, the specific limitations of one or more load splitting and power restoration system embodiments provided below can be found in the limitations of the load splitting and power restoration method described above, and will not be repeated here.

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

[0128] The power restoration zone determination module 100 is used to respond to the self-healing power restoration request of the distribution network line fault. Based on the electrical topology connection relationship of the distribution network and the opening and closing status of each automatic switch, it determines the first power restoration switch and the disconnecting switch, and determines the area formed by the topology connection between the first power restoration switch and the disconnecting switch as the power restoration zone.

[0129] The overload judgment module 200 is used to determine whether the outgoing switch of the opposite line is overloaded based on the load of the area to be restored and the load of the outgoing switch of the opposite line.

[0130] The load splitting path determination module 300 is used to determine the load splitting path of the area to be restored based on the electrical topology of the distribution network when it is determined that the outgoing switch of the opposite line is overloaded. The load splitting path is the connection line from the disconnecting switch to the tie switch, and the load splitting path includes multiple sectionalizing switches.

[0131] The load transfer switch determination module 400 is used to determine the load transfer switches corresponding to each segment of the load line section within the area to be restored, based on the load splitting path; wherein, the load transfer switches are used to transfer the load of each segment of the load line section.

[0132] The power restoration operation module 500 is used to perform power restoration operations on the area to be restored via load transfer switches and disconnect switches.

[0133] like Figure 9 As shown, this application provides an electronic device 10, which includes a memory 20 and a processor 30. The memory stores a computer program. When the computer program is executed by the processor, the processor performs the steps of the load splitting and power restoration method as described in any of the above embodiments.

[0134] This application provides a computer-readable storage medium storing a computer program thereon, which, when executed, implements the steps of the load splitting and power restoration method as described in any of the above embodiments.

[0135] Those skilled in the art will clearly understand that, for the sake of convenience and brevity, the specific working processes of the systems, electronic devices, and computer storage media described above can be referred to the corresponding processes in the foregoing method embodiments, and will not be repeated here.

[0136] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this invention are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of the invention described herein can be implemented in orders other than those illustrated or described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover a non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0137] In the several embodiments provided by this invention, it will be understood that each block in the flowchart or block diagram may represent a module, segment, or portion of code, which contains one or more executable instructions for implementing a specified logical function. It should also be noted that in some alternative implementations, the functions marked in the blocks may occur in a different order than those shown in the figures. For example, two consecutive blocks may actually be executed substantially in parallel, and they may sometimes be executed in reverse order, depending on the functions involved.

[0138] In the embodiments provided by this 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 merely illustrative; for instance, the division of units is only a logical functional division, and in actual implementation, there may be other division methods. For example, multiple units or components may be combined or integrated into another system, or some features may be ignored or not executed. Furthermore, the coupling or direct coupling or communication connection shown or discussed may be through some interfaces, indirect coupling or communication connection between devices or units, and may be electrical, mechanical, or other forms.

[0139] The units described as separate components may or may not be physically separate. The components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple network units. Some or all of the units can be selected to achieve the purpose of this embodiment according to actual needs.

[0140] Furthermore, the functional units in the various embodiments of the present invention can be integrated into one processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit. The integrated unit can be implemented in hardware or as a software functional unit.

[0141] If the integrated unit is implemented as 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, in essence, 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. This computer software product is stored in a storage medium and includes several instructions for executing all or part of the steps of the methods described in the various embodiments of the present invention through a computer device (which may be a personal computer, a server, or a network device, etc.). The aforementioned storage medium includes: USB flash drives, portable hard drives, read-only memory (ROM), random access memory (RAM), magnetic disks, optical disks, and other media capable of storing program code.

[0142] The above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit it. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A method for load splitting and power restoration, characterized in that, include: In response to a line fault self-healing power restoration request in the distribution network, the first power restoration switch and the disconnecting switch are determined according to the electrical topology of the distribution network and the opening and closing status of each automatic switch, and the area formed by the topological connection between the first power restoration switch and the disconnecting switch is determined as the area to be restored. Determine whether the outgoing switch of the opposite line is overloaded based on the load of the area to be restored and the load of the outgoing switch of the opposite line. When it is determined 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 topology of the distribution network. The load splitting path is the connection line from the disconnecting switch to the tie switch, and the load splitting path includes multiple sectionalizing switches. Determining the load splitting path for the area to be restored based on the electrical topology of the distribution network includes: Based on the electrical topology of the power distribution network and the connection lines from the disconnecting switch to multiple tie switches, multiple candidate load splitting paths are determined. Based on the multiple candidate load splitting paths, the candidate load splitting path containing the largest number of segment switches is selected as the load splitting path. Based on the load splitting path, determine the load transfer switches corresponding to each segment of the load line section within the area to be restored; wherein, the load transfer switches are used to transfer the load of each segment of the load line section; The load transfer switch includes a second power restoration switch and a split switch; The step of determining the load transfer switches corresponding to each segment of the load line section within the area to be restored based on the load splitting path includes: The interconnecting switches connected to the load splitting path are sorted from closest to furthest from the original power supply point. The maximum load transfer capacity of the tie switch is determined sequentially based on the sorting results, and the segmented load corresponding to the tie switch is determined based on the maximum load transfer capacity of the tie switch. Based on the segmented loads supplied by the interconnecting switches, determine the segmented load line section composed of multiple segmented switches that satisfy the segmented loads; 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 tie switch, and based on the updated tie switch, repeat the steps of determining the maximum load transfer capacity of the tie switch according to the sorting result, and determining the segmented load corresponding to the tie switch according to the maximum load transfer capacity of the tie switch, until all segmented switches in the area to be restored are transferred by the load transfer switch. The power restoration operation is performed on the area to be restored by the load transfer switch and the disconnect switch.

2. The load splitting and power restoration method according to claim 1, characterized in that, Based on the electrical topology of the power distribution network and the opening / closing status of each automated switch, the first power restoration switch and the disconnecting switch are determined, and the area formed by the topological connection between the first power restoration switch and the disconnecting switch is determined as the area to be restored, including: When a line fault occurs in the power distribution network, the fault current signal is cut off by the outgoing switch that is closest to the fault location and receives the fault current signal. Based on the electrical topology of the power distribution network, the line fault section is defined as the line between the nearest upstream automatic switch and the nearest downstream automatic switch at the fault location. Based on the electrical topology of the power distribution network, an automated switch that is electrically connected to the fault section of the line and connected to the tie switch / original power supply bus is identified as a candidate disconnect switch. Based on the open / closed state of the candidate disconnecting switches, the candidate disconnecting switches in the closed state are selected as disconnecting switches. The automated switch connecting the disconnecting switch to the opposite power supply bus / original power supply bus is considered as a candidate power restoration switch; Based on the open / closed state of the candidate power-on switch, the candidate power-on switch in the closed state is taken as the first power-on switch; The area where the disconnecting switch and the re-energizing switch are directly electrically connected is defined as the area to be re-energized.

3. The load splitting and power restoration method according to claim 1, characterized in that, The step of determining whether the outgoing switch of the opposite line is overloaded based on the load of the area to be restored and the load of the outgoing switch of the opposite line includes: The restoration load current of the area to be restored is determined based on the load current of all disconnect switches in the area to be restored and the load current of the outgoing switches on the opposite side of the line before the fault. Determine whether the restoration load current of the area to be restored is greater than the preset rated current of the opposite line; When it is determined that the recovery 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 switch of the opposite line is overloaded. When it is determined that the restoration 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 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: Based on the electrical topology of the power distribution network, determine whether the area to be restored has at least one interconnecting switch that transfers power to the area to be restored; When it is determined that there is at least one tie switch that transfers power to the area to be restored, the process of determining the load splitting path from the disconnect switch to the tie switch based on the electrical topology of the power distribution network continues. When it is determined that there is no at least one connecting switch that transfers power to the area to be restored, the area to be restored is powered through the first power restoration switch and the disconnecting switch.

5. The load splitting and power restoration method according to claim 1, characterized in that, The power restoration operation of the area to be restored through the load transfer switch and the disconnect switch includes: The power-on operation is performed on the area to be restored by opening all the disconnect switches and the split switches, and closing all the second power-on switches.

6. A load splitting and power restoration system, characterized in that, include: The power restoration zone determination module is used to respond to the power restoration request of the distribution network for line fault self-healing. Based on the electrical topology connection relationship of the distribution network and the opening and closing status of each automatic switch, it determines the first power restoration switch and the disconnecting switch, and determines the area formed by the topological connection between the first power restoration switch and the disconnecting switch as the power restoration zone. The overload detection module is used to determine whether the outgoing switch of the opposite line is overloaded based on the load of the area to be restored and the load of the outgoing switch of the opposite line. The load splitting path determination module is used to determine the load splitting path of the area to be restored based on the electrical topology of the distribution network when it is determined that the outgoing switch of the opposite line is overloaded. The load splitting path is the connection line from the disconnecting switch to the tie switch, and the load splitting path includes multiple sectionalizing switches. Determining the load splitting path for the area to be restored based on the electrical topology of the distribution network includes: Based on the electrical topology of the power distribution network and the connection lines from the disconnecting switch to multiple tie switches, multiple candidate load splitting paths are determined. Based on the multiple candidate load splitting paths, the candidate load splitting path containing the largest number of segment switches is selected as the load splitting path. The load transfer switch determination module is used to determine the load transfer switches corresponding to each segment of the load line section within the area to be restored, based on the load splitting path; wherein, the load transfer switches are used to transfer the load of each segment of the load line section. The load transfer switch includes a second power restoration switch and a split switch; Based on the load splitting path, determine the load transfer switches corresponding to each segment of the load line section within the area to be restored, including: The interconnecting switches connected to the load splitting path are sorted from closest to furthest from the original power supply point. The maximum load transfer capacity of the tie switch is determined sequentially based on the sorting results, and the segmented load corresponding to the tie switch is determined based on the maximum load transfer capacity of the tie switch. Based on the segmented loads supplied by the interconnecting switches, determine the segmented load line section composed of multiple segmented switches that satisfy the segmented loads; 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 tie switch, and based on the updated tie switch, repeat the steps of determining the maximum load transfer capacity of the tie switch according to the sorting result, and determining the segmented load corresponding to the tie switch according to the maximum load transfer capacity of the tie switch, until all segmented switches in the area to be restored are transferred by the load transfer switch. The power restoration operation module is used to perform power restoration operation on the area to be restored through the load transfer switch and the disconnect switch.

7. An electronic device, characterized in that, The electronic device includes a memory and a processor. The memory stores a computer program, which, when executed by the processor, causes the processor to perform the steps of the load splitting and power restoration method as described in any one of claims 1-5.

8. A computer-readable storage medium having a computer program stored thereon, characterized in that, When the computer program is executed, it implements the steps of the load splitting and power restoration method as described in any one of claims 1-5.

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