Active power distribution network fault self-recovery method and device based on intelligent terminal unit

Abstract

The invention relates to an active power distribution network fault self-recovery method and device based on an intelligent terminal unit. The method is applied to a management master station in the fault self-recovery system, the fault self-recovery system further comprises a plurality of core intelligent terminal units (STU), and the method comprises the following steps: determining a plurality of non-fault areas and at least one fault area in the active power distribution network according to at least one fault position in the active power distribution network, according to the global network topology description matrix of the active power distribution network, the available state of the inverter type distributed power supply IIDG in each non-fault area and the corresponding available power supply capacity in each non-fault area, determining a power supply recovery strategy of each non-fault area, and according to the power supply recovery strategy, recovering the power supply capacity of each non-fault area. And carrying out fault self-healing on the load in each non-fault area in the active power distribution network. By adopting the method, the power failure range in the active power distribution network is reduced, and the power supply reliability of the active power distribution network is improved.

Description

Technical Field

[0001] The present application relates to the field of power electronics technology, and in particular, to an active distribution network fault self-healing method and device based on an intelligent terminal unit. Background Art

[0002] With the continuous progress and development of power grid technology, active distribution networks have gradually become an important part of new distribution networks. In practical applications, active distribution networks are large in scale, and line faults often occur, resulting in power outages of some loads in the active distribution network and being unable to operate. Therefore, it is particularly important to perform fault self-healing on active distribution networks.

[0003] In related technologies, the main method is to restore power supply to the loads in the non-fault power outage areas through the main network power supply in the active distribution network to achieve fault self-healing of the active distribution network.

[0004] However, in related technologies, there is a problem of low power supply reliability in performing fault self-healing on active distribution networks. Summary of the Invention

[0005] Based on this, it is necessary to provide an active distribution network fault self-healing method and device based on an intelligent terminal unit that can improve the power supply reliability of the active distribution network for the above technical problems.

[0006] In a first aspect, an embodiment of the present application provides an active distribution network fault self-healing method, which is applied to a management master station in a fault self-healing system. The fault self-healing system further includes a plurality of core intelligent terminal units STU; the method includes:

[0007] Determine a plurality of non-fault areas and at least one fault area in the active distribution network according to at least one fault location in the active distribution network;

[0008] Determine the power supply restoration strategy for each non-fault area according to the global network topology description matrix of the active distribution network, the available states of inverter-type distributed generators IIDGs in each non-fault area, and the corresponding available power supply capacity in each non-fault area; the corresponding available power supply capacity in a non-fault area includes at least one of the power supply capacity of the IIDG in the non-fault area and the transferable standby capacity of the downstream tie switch of the target core STU. The power supply restoration strategy includes the power supply states of each IIDG and the closing states of each downstream tie switch;

[0009] Perform fault self-healing on the loads in each non-fault area of the active distribution network according to the power supply restoration strategy.

[0010] In one embodiment, determining a plurality of non-fault areas and at least one fault area in the active distribution network according to at least one fault location in the active distribution network includes:

[0011] Determine the area between adjacent fault locations in the active distribution network as the fault area, and determine the area other than at least one fault area in the active distribution network as the non-fault area.

[0012] In one embodiment, the method further includes:

[0013] Obtain the real-time topology description matrix in each dynamic partition of the active distribution network sent by each core STU; wherein, the real-time topology description matrix in the dynamic partition is determined according to the topology description matrix in the dynamic partition and the constructed matrix of the corresponding switch states;

[0014] Determine the global network topology description matrix of the active distribution network according to each real-time topology description matrix.

[0015] In one embodiment, according to the global network topology description matrix of the active distribution network, the available states of the inverter-type distributed generators (IIDGs) in each non-fault area, and the corresponding available power supply capacities in each non-fault area, determine the power supply restoration strategy for each non-fault area, including:

[0016] For any non-fault area, when it is determined that the available state of the IIDG in the non-fault area is available, detect whether the power supply capacity of the IIDG meets the power supply capacity required by the load in the non-fault area;

[0017] If so, according to the global network topology description matrix, determine the restored closed state of the first switch for the IIDG to operate in the island mode; the first switch is the sectionalizing switch in the non-fault area;

[0018] Generate the power supply restoration strategy for the non-fault area according to the restored closed state of the first switch.

[0019] In one embodiment, the method further includes:

[0020] When it is determined that the available state of the IIDG is available and the power supply capacity of the IIDG does not meet the power supply capacity required by the load in the non-fault area, according to the global network topology description matrix, determine the restored closed state of the first switch for the IIDG to operate in the island mode and the restored closed state of the downstream tie switch of the target core STU in the active distribution network; generate the power supply restoration strategy for the non-fault area according to the restored closed state of the first switch and the restored closed state of the downstream tie switch.

[0021] In one embodiment, the method further includes:

[0022] When it is determined that the available state of the IIDG in the non-fault area is unavailable, determine whether the transferable spare capacity meets the load recovery conditions in the non-fault area according to the transferable spare capacity of the downstream tie switch of the target core STU and the power supply capacity required by the load in the non-fault area;

[0023] If it is satisfied, determine the restored closed state of the downstream tie switch according to the global network topology description matrix;

[0024] Generate a power supply restoration strategy for the non-fault area according to the restored closed state of the downstream tie switch.

[0025] In one embodiment, there are multiple downstream tie switches; the method further includes:

[0026] If it is not satisfied, construct a main network power supply restoration model corresponding to each downstream tie switch in the non-fault area according to the power supply capacity required by the load in the non-fault area;

[0027] Solve the main network power supply restoration model by using an improved genetic algorithm according to the global network topology description matrix to obtain the optimal restored closed state of each downstream tie switch;

[0028] Generate a power supply restoration strategy for the non-fault area according to the optimal restored closed state of each downstream tie switch.

[0029] In one embodiment, according to the power supply restoration strategy, perform fault self-healing on the loads in each non-fault area of the active distribution network, including:

[0030] For any non-fault area, generate a closing and switching instruction for at least one second switch in the non-fault area according to the power supply restoration strategy; the second switch is the downstream tie switch and / or sectionalizing switch of the core STU in the non-fault area;

[0031] Send the closing and switching instructions of each second switch to the core STU in the non-fault area to instruct the core STU to control the closing state of each second switch to be switched.

[0032] In a second aspect, an embodiment of the present application further provides an active distribution network fault self-healing device based on an intelligent terminal unit, and the device includes:

[0033] A first determination module, configured to determine a plurality of non-fault areas and at least one fault area in the active distribution network according to at least one fault location in the active distribution network;

[0034] A second determination module, configured to determine a power supply restoration strategy for each non-fault area according to the global network topology description matrix of the active distribution network, the available states of the inverter-type distributed generators (IIDGs) in each non-fault area, and the corresponding available power supply capacities in each non-fault area; the corresponding available power supply capacity in a non-fault area includes at least one of the power supply capacity of the IIDG in the non-fault area and the transferable standby capacity of the downstream tie switch of the target core STU, and the power supply restoration strategy includes the power supply states of the IIDGs and the closed states of the downstream tie switches;

[0035] A fault self-healing module, configured to perform fault self-healing on the loads in each non-fault area of the active distribution network according to the power supply restoration strategy.

[0036] In a third aspect, an embodiment of the present application further provides a computer device, which includes a memory and a processor. The memory stores a computer program, and when the processor executes the computer program, the steps of the method in any one of the embodiments in the first aspect are implemented.

[0037] In a fourth aspect, an embodiment of the present application further provides a computer-readable storage medium, on which a computer program is stored. When the computer program is executed by a processor, the steps of the method in any one of the embodiments in the first aspect are implemented.

[0038] In a fifth aspect, an embodiment of the present application further provides a computer program product, which includes a computer program. When the computer program is executed by a processor, the steps of the method in any one of the embodiments in the first aspect are implemented.

[0039] The above-mentioned active distribution network fault self-healing method based on intelligent terminal units is applied to the management master station in the fault self-healing system. The fault self-healing system further includes multiple core intelligent terminal units STU, and it includes: determining multiple non-fault areas and at least one fault area in the active distribution network according to at least one fault location in the active distribution network; determining the power supply restoration strategies for each non-fault area according to the global network topology description matrix of the active distribution network, the available states of inverter-type distributed generators IIDG in each non-fault area, and the corresponding available power supply capacities in each non-fault area, and performing fault self-healing on the loads in each non-fault area of the active distribution network according to the power supply restoration strategies. Among them, the corresponding available power supply capacity in the non-fault area includes at least one of the power supply capacity of the IIDG in the non-fault area and the transferable standby capacity of the downstream tie switch of the target core STU. The power supply restoration strategies include the power supply states of each IIDG and the closing states of each downstream tie switch. The above method can consider the available states of the IIDG in the active distribution network, and jointly supply power to as many and high-weight lost-power loads as possible in the non-fault area through the available IIDG and the main network power source in the active distribution network, so as to narrow the power outage range in the active distribution network and improve the power supply reliability of the active distribution network. At the same time, the above method does not require manual participation by users, and the management master station can achieve centralized processing and hierarchical interaction, which can improve the speed and efficiency of fault self-healing of lost-power loads in the active distribution network, and reduce the communication delay and the data pressure on the management master station. Description of the Drawings

[0040] Figure 1 It is an application environment diagram of the active distribution network fault self-healing method based on intelligent terminal units in an embodiment;

[0041] Figure 2 It is a schematic flowchart of the active distribution network fault self-healing method based on intelligent terminal units in an embodiment;

[0042] Figure 3 It is a schematic flowchart of the active distribution network fault self-healing method based on intelligent terminal units in another embodiment;

[0043] Figure 4 It is a schematic flowchart of the active distribution network fault self-healing method based on intelligent terminal units in another embodiment;

[0044] Figure 5 It is a centralized STU network architecture diagram in the fault self-healing system in another embodiment;

[0045] Figure 6 It is a centralized STU network architecture diagram in the fault self-healing system in another embodiment;

[0046] Figure 7Schematic diagram of the process of the active distribution network fault self-healing method based on the intelligent terminal unit in another embodiment;

[0047] Figure 8 Schematic diagram of the process of the active distribution network fault self-healing method based on the intelligent terminal unit in another embodiment;

[0048] Figure 9 Centralized STU network architecture diagram in the fault self-healing system in another embodiment;

[0049] Figure 10 Schematic diagram of the process of the active distribution network fault self-healing method based on the intelligent terminal unit in another embodiment;

[0050] Figure 11 Schematic diagram of the process of the active distribution network fault self-healing method based on the intelligent terminal unit in another embodiment;

[0051] Figure 12 Structural block diagram of the active distribution network fault self-healing device based on the intelligent terminal unit in one embodiment;

[0052] Figure 13 Internal structure diagram of a computer device in one embodiment. Detailed implementation manners

[0053] In order to make the objectives, technical solutions and advantages of the present application clearer, the present application will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0054] The active distribution network fault self-healing method based on the intelligent terminal unit provided by the embodiments of the present application can be applied to such as Figure 1In the application environment shown, the application environment includes a fault self-healing system, which may include an active distribution network and a centralized STU network architecture; the active distribution network includes a main network power supply, loads on multiple nodes, multiple IIDGs, and a management master station. The centralized STU network architecture may include multiple STUs, a base station, and at least one customer premise equipment (CPE). The multiple STUs include multiple head-end STUs close to the main network and multiple ordinary STUs connected to each head-end STU. Among them, each head-end STU communicates with the management master station through the CPE, that is, the active distribution network in the fault self-healing system is connected to each STU through a communication network. Optionally, the communication network may be a 3rd Generation (3G) mobile communication network or a 4th Generation (4G) mobile communication network. In the embodiments of the present application, the 5th Generation (5G) mobile communication network is taken as an example for illustration.

[0055] Among them, each STU is used to detect the closing state of the corresponding local outgoing switch, sectionalizing switch, tie switch, and / or IIDG access switch in the active distribution network, and control the switching of the closing state of these switches. Optionally, the CPE and the STU in the centralized STU network architecture can be installed in the same ring main cabinet, and the CPE can be made lightweight and modular, and can be integrated with the STU in one device.

[0056] In the embodiments of the present application, sectionalizing switches and STUs can be installed at both the upstream area of the IIDG in the active distribution network and both ends of the feeder to avoid the IIDG continuously injecting short-circuit current into non-faulty components; and sectionalizing switches and STUs can also be installed downstream of the IIDG and in the radial area without IIDG access and close to the main network power supply side. Among them, the STU close to the main network power supply side is called the upstream STU, otherwise it is called the downstream STU. Figure 1 In [Figure], STU1 and STU3 are the upstream STU and downstream STU of STU2 respectively; the STU at the IIDG access switch is called the IIDG access switch STU, such as Figure 1 STU5 and STU13 in [Figure], and the STU at the outgoing switch on the main network power supply side is called the head-end STU, such as Figure 1 STU1, STU6, and STU10 in [Figure]. In addition, the head-end STU and the IIDG access switch STU are called core STUs, and other STUs are called non-core STUs.

[0057] In an exemplary embodiment, as Figure 2 shown, a method for self-healing faults in an active distribution network based on intelligent terminal units is provided. This method is applied to Figure 1Taking the management master station in the fault self-healing system as an example for illustration, the fault self-healing system further includes a plurality of core intelligent terminal units STU. The method includes the following steps:

[0058] S100. Determine a plurality of non-fault regions and at least one fault region in the active distribution network according to at least one fault location in the active distribution network.

[0059] It should be noted here that the faults in the active distribution network can be understood as line faults, and the fault locations in the active distribution network can be one or more. Among them, the management master station can determine the regions within a preset distance range around each fault location in the active distribution network as fault regions, and the regions outside the preset distance range around each fault location as non-fault regions. Optionally, the preset distance range can be determined by user definition or according to historical experience values.

[0060] At the same time, each non-fault region and each fault region can be composed of at least one node, and each node is provided with an electrical load.

[0061] In one embodiment, the steps in the above S100 may include: determining the regions between adjacent fault locations in the active distribution network as fault regions, and determining the regions in the active distribution network other than at least one fault region as non-fault regions.

[0062] As Figure 1 shown, if there are two fault locations in the active distribution network, namely f1 and f2, then the region between the fault location f1 and the fault location f2 can be called a fault region, and other regions are called non-fault regions.

[0063] Among them, when the fault location is at f1, STU4 can control S41 to disconnect and STU5 can control S51 to disconnect to isolate the fault region between S41 and S51; when the fault location is at f2, STU5 can control S52 to disconnect and STU7 can control S71 to disconnect to isolate the fault region between S52 and S71 and reduce the range of power-off loads in the active distribution network; when the fault location is at f3, STU7 can control S72 to disconnect and STU8 can control S81 to disconnect to isolate the fault region between S72 and S81.

[0064] S200. Determine the power supply restoration strategy for each non-fault area based on the global network topology description matrix of the active distribution network, the available states of the inverter-type distributed generation (IIDG) in each non-fault area, and the corresponding available power supply capacities in each non-fault area. Among them, the corresponding available power supply capacity in a non-fault area includes at least one of the power supply capacity of the IIDG in the non-fault area and the transferable standby capacity of the downstream tie switch of the target core STU. The power supply restoration strategy includes the power supply states of each IIDG and the closed states of each downstream tie switch.

[0065] Among them, the available state of the IIDG in a non-fault area can be available or unavailable; the available state of the IIDG in a non-fault area being available indicates that the IIDG in the non-fault area can restore power supply to each load in the non-fault area; the available state of the IIDG in a non-fault area being unavailable indicates that the IIDG in the non-fault area cannot restore power supply to each load in the non-fault area.

[0066] Specifically, for any non-fault area, the management master station can pre-train an algorithm model, and then input the global network topology description matrix of the active distribution network, the available state of the inverter-type distributed generation (IIDG) in the non-fault area, and the corresponding available power supply capacity in this non-fault area into the algorithm model, and the algorithm model outputs the power supply restoration strategy for this non-fault area.

[0067] In addition, the management master station can construct the power supply restoration strategy for the non-fault area according to the global network topology description matrix of the active distribution network, the available state of the inverter-type distributed generation (IIDG) in the non-fault area, and the corresponding available power supply capacity in this non-fault area according to the preset power supply restoration rules. Optionally, the power supply restoration rules can include information such as power supply constraint conditions and power supply duration.

[0068] S300. Perform fault self-healing on the loads in each non-fault area of the active distribution network according to the power supply restoration strategy.

[0069] In practical applications, the management master station can directly control the fault self-healing of the loads in each non-fault area of the active distribution network according to the power supply restoration strategy.

[0070] In one embodiment, as Figure 3 shown, the step of performing fault self-healing on the loads in each non-fault area of the active distribution network according to the power supply restoration strategy in the above S300 can be implemented in the following manner:

[0071] S310. For any non-fault area, generate a closing switching instruction for at least one second switch in the non-fault area according to the power supply restoration strategy; the second switch is the downstream tie switch and / or sectionalizing switch of the core STU in the non-fault area.

[0072] In the embodiment of the present application, the management master station can indirectly control the load in each non-fault area of the active distribution network to perform fault self-healing according to the power supply restoration strategy.

[0073] Specifically, for any non-fault area, the management master station can generate a closing switching instruction for at least one second switch in the non-fault area according to the power supply state of the IIDG in the non-fault area and the closing state of the corresponding downstream tie switch in the power supply restoration strategy. Here, the second switch is the downstream tie switch and / or sectionalizing switch of the core STU in the non-fault area; the downstream tie switch of the core STU in the non-fault area can be one or more, and the sectionalizing switch of the core STU in the non-fault area can also be one or more.

[0074] S320. Send the closing switching instructions of the second switches to the core STU in the non-fault area, instructing the core STU to control the closing state of each second switch to be switched.

[0075] Furthermore, the management master station can send the closing switching instructions of at least one second switch in the non-fault area to the core STU in the non-fault area, instructing the core STU in the non-fault area to control the closing state of each second switch to be switched, so as to ensure that as many and high-weight loads as possible in the non-fault area can resume power consumption.

[0076] The technical solution in the embodiment of the present application is applied to the management master station in the fault self-healing system. The fault self-healing system further includes a plurality of core intelligent terminal units STU. According to at least one fault location in the active distribution network, a plurality of non-fault areas and at least one fault area in the active distribution network are determined. According to the global network topology description matrix of the active distribution network, the available states of the inverter-type distributed power sources IIDG in each non-fault area and the corresponding available power supply capacities in each non-fault area, the power supply restoration strategy for each non-fault area is determined, and according to the power supply restoration strategy, the load in each non-fault area of the active distribution network is subjected to fault self-healing. Among them, the corresponding available power supply capacity in the non-fault area includes at least one of the power supply capacity of the IIDG in the non-fault area and the transferable standby capacity of the downstream tie switch of the target core STU. The power supply restoration strategy includes the power supply state of each IIDG and the closing state of each downstream tie switch. The above method can consider the available state of the IIDG in the active distribution network, and jointly supply power to as many and high-weight de-energized loads as possible in the non-fault area through the available IIDG and the main network power source in the active distribution network, so as to narrow the power outage range in the active distribution network and improve the power supply reliability of the active distribution network. At the same time, the above method does not require manual participation by users, and the management master station can achieve centralized processing and hierarchical interaction, which can improve the speed and efficiency of fault self-healing of de-energized loads in the active distribution network, reduce communication delay and the data pressure of the management master station.

[0077] The process of obtaining the global network topology description matrix of the active distribution network will be described below. In one embodiment, before performing the steps in S200 above, as Figure 4 shown, the above method may further include:

[0078] S400. Obtain the real-time topology description matrix within each dynamic partition in the active distribution network sent by each core STU. Among them, the real-time topology description matrix within the dynamic partition is determined according to the topology description matrix within the dynamic partition and the constructed matrix of the corresponding switch states.

[0079] It should be noted here that each STU close to the main network power supply can be called a head-end STU or a core STU. In practical applications, each core STU can first obtain the upstream and downstream information, core identification, electrical quantity information, and status quantity information of each STU within its own dynamic partition in a step-by-step query manner, and then determine the real-time topology description matrix within the dynamic partition according to the upstream and downstream information, core identification, electrical quantity information, and status quantity information of each STU within the dynamic partition.

[0080] It should be noted here that the status quantity information of the STU may include the real-time status of various switches at the STU (including tie switches, sectionalizing switches, IIDG access switches, outgoing line switches, etc.), the number, type, communication address, etc. of the STU; the electrical quantity information of the STU may include branch power, voltage, current, load power, and IIDG-related information (including the type, output, and preset island capacity of the IIDG, etc.). Among them, the electrical quantity information of the STU can be measured by sensors, transformers, micro synchronous measurement units, and IIDG operation monitoring devices, etc.

[0081] First, the process of each core STU obtaining the upstream and downstream information, core identification, electrical quantity information, and status quantity information of each STU within its own dynamic partition in the IIDG grid-connected operation mode will be described. Among them, IIDG grid-connected operation refers to the mode in which the IIDG combines with the main network power supply to restore power supply. At this time, the sectionalizing switch at the IIDG is in the closed state; the upstream and downstream information of the above STU may include the upstream STU and downstream STU of the STU; the core identification of the STU may include the core STU within the dynamic partition to which the STU belongs. As Figure 5 shown, STU1, STU7, and STU11 are all called head-end STUs and core STUs. In practical applications, regions 1, 2, 3, and 4 can all be called dynamic partitions. Among them, in this scenario, the IIDG is grid-connected and operating. At this time, regions 1 and 4 can be regarded as a large region.

[0082] For area 1 and area 4: core STU1 sends a query command to downstream STU2. After receiving the query command, STU2 can obtain its own upstream and downstream information, core identification, electrical quantity information and status quantity information, and feed this information back to core STU1. The segment switch at STU2 (i.e., line segment switch) is in a closed state and there is STU3 downstream of STU2. At this time, STU2 can continue to send query commands to STU3. After receiving the query command, STU3 can obtain its own upstream and downstream information, core identification, electrical quantity information and status quantity information, and feed this information back to core STU1 through STU2.

[0083] Next, STU3 sends a query instruction to STU4, instructing STU4 to obtain its own upstream and downstream information, core identification, electrical quantity information and state quantity information, and STU4 feeds back this information to the core STU1 through STU3 and STU2 in turn.

[0084] Afterwards, STU4 sends a query instruction to STU5 and STU6. After receiving the query instruction, STU5 and STU6 obtain their respective upstream and downstream information, core identification, electrical quantity information and state quantity information, and STU5 feeds back these information to the core STU1 through STU4, STU3 and STU2 in turn, and STU6 feeds back these information to the core STU1 through STU4, STU3 and STU2 in turn. Among them, since STU5 is an IIDG access STU, in this case, STU5 no longer sends query instructions, that is, STU5 has no downstream STU. At the same time, there is no downstream STU after STU6, and the query process of area 1 ends here, and area 1 with STU1 as the core is obtained.

[0085] For Region 2:

[0086] The core STU7 sends a query command to the downstream STU8. After receiving the query command, STU8 can obtain its own upstream and downstream information, core identification, electrical quantity information and status quantity information, and feed this information back to the core STU7. The segmentation switch (i.e., line segmentation switch) at STU8 is in a closed state and there is STU9 downstream of STU8. At this time, STU8 can continue to send query commands to STU9. After receiving the query command, STU9 can obtain its own upstream and downstream information, core identification, electrical quantity information and status quantity information, and feed this information back to the core STU7 through STU8.

[0087] Next, STU9 sends a query instruction to STU10, instructing STU10 to obtain its upstream and downstream information, core identifier, electrical quantity information, and status quantity information. And STU10 feeds back these information of itself to the core STU7 through STU9 and STU8 in sequence. Among them, the tie switch (or line sectionalizing switch) at STU10 is in the off state, and thus the query process in Area 2 ends.

[0088] Among them, the query process in Area 3 is similar to that in other areas, and thus will not be elaborated in this embodiment of the present application.

[0089] Second, the process of each core STU obtaining the upstream and downstream information, core identifier, electrical quantity information, and status quantity information of each STU within its own dynamic partition in the IIDG island operation mode will be described below. Among them, the IIDG island operation mode refers to the mode in which the IIDG independently realizes power restoration. As Figure 6 shown, STU1, STU5, STU7, and STU11 are called core STUs. In practical applications, Area 1, Area 2, Area 3, and Area 4 can all be called dynamic partitions.

[0090] Regarding Area 1:

[0091] The core STU1 sends a query instruction to the downstream STU2. After receiving this query instruction, STU2 can obtain its upstream and downstream information, core identifier, electrical quantity information, and status quantity information, and feed back these information to the core STU1. The sectionalizing switch (i.e., the line sectionalizing switch) at STU2 is in the closed state and there is still STU3 downstream of STU2. At this time, STU2 can continue to send a query instruction to STU3. After receiving this query instruction, STU3 can obtain its upstream and downstream information, core identifier, electrical quantity information, and status quantity information, and feed back these information to the core STU1 through STU2. Among them, when the sectionalizing switch at STU3 is in the off state, the query process in Area 1 ends.

[0092] Among them, the query processes in Area 2 and Area 3 are similar to those in other areas, and thus will not be elaborated in this embodiment of the present application.

[0093] Regarding Area 4:

[0094] After the query processes in regions 1, 2, and 3 are all completed, STU5 has not received any query instructions sent by any STU, and the IIDG access switch at STU5 is in the closed state. At this time, STU5 determines that the IIDG is in the island operation mode, and STU5, as the core STU, executes the query process for region 4. After that, STU5 can send a query instruction to STU4, and STU4 instructs STU4 to obtain its upstream and downstream information, core identifier, electrical quantity information, and status quantity information, and STU4 feeds back this information of itself to the core STU5.

[0095] Next, STU4 sends a query instruction to STU6. After receiving this query instruction, STU6 obtains its upstream and downstream information, core identifier, electrical quantity information, and status quantity information, and STU6 feeds back this information of itself to the core STU5 through STU4 in sequence.

[0096] It should be noted here that the real-time topology description matrix obtained by the core STU7 can be the product of the regional topology description matrix R within the region to which the core STU7 belongs and the switch status matrix C within the region. Taking Figure 2 region 2 in

[0097] (1)

[0098] where each element in R is denoted as r ij , r ij equal to 1 indicates that there is a direct connection between the sectional switch at the i-th STU and the j-th STU within the region and the connection direction is positive, r ij equal to -1 indicates that there is a direct connection between the sectional switch at the i-th STU and the j-th STU within the region and the connection direction is negative, r ij equal to 0 indicates that there is no direct connection between the sectional switch at the i-th STU and the j-th STU within the region. For example, within region 2, STU7 sends a query instruction to STU8, and the sectional switch at STU8 is directly connected (i.e., adjacent) to STU7 and the connection direction is positive; STU8 sends a corresponding message to STU7, indicating that the connection direction is negative; there is STU8 between STU7 and STU9 within region 2, so there is no direct connection between STU7 and STU9.

[0099] Meanwhile, the switch status matrix C within the region can be obtained by transforming the switch status vector S within the region. Continuing with Figure 2 region 2 in

[0100] (2)

[0101] Further, the real-time topology description matrix T obtained by multiplying the region topology description matrix R in region 2 by the switch state matrix C in region 2 is expressed as:

[0102] (3)

[0103] Among them, t 12 = 1 means that STU7 in region 2 sends a query instruction to STU8, and the sectional switch at STU8 is in the closed state; t 23 = 1 means that STU8 in region 2 sends a query instruction to STU9, and the sectional switch at STU9 is in the closed state; t 21 = -1 means that STU8 feeds back relevant information to STU7; t 32 = -1 means that STU9 feeds back relevant information to STU8; T 43 = -1 means that STU10 feeds back relevant information to STU9; STU7 queries the third row and finds that there is no element with a value of 1, indicating that the sectional switch at STU10 is in the open state. Thus, the query process for region 2 ends. It should be noted here that T is a sparse matrix, which is convenient for the transmission of the communication network, without the need to transmit a large amount of electrical quantity information and status quantity information, reducing the transmission pressure of the communication network.

[0104] In addition, each core STU only obtains the real-time topology description matrix of its own region, without obtaining the real-time topology description matrix outside its region. Correspondingly, each core STU does not communicate directly with other STUs outside the region, which can reduce the probability of errors during the communication transmission process and improve the efficiency of the communication network.

[0105] S500. Determine the global network topology description matrix of the active distribution network according to each real-time topology description matrix.

[0106] Further, the management master station can perform statistics or combination on the real-time topology description matrices within the regions of each core STU to obtain the global network topology description matrix of the active distribution network.

[0107] In the technical solution of the embodiment of the present application, a real-time topology description matrix in each dynamic partition in the active distribution network sent by each core STU is obtained, and according to each real-time topology description matrix, a global network topology description matrix of the active distribution network is determined, wherein the real-time topology description matrix in the dynamic partition is determined according to the topology description matrix in the dynamic partition and a matrix constructed by the corresponding switch state; the above method can obtain the real-time topology description matrix of each area in the active distribution network by partition, and based on this, obtain the global network topology description matrix of the active distribution network. Compared with directly obtaining the global network topology description matrix of the active distribution network, the processing process is relatively simple, and the amount of data processed in the process of obtaining the real-time topology description matrix of each area by partition is small, so as to reduce the processing complexity and speed up the speed of obtaining the global network topology description matrix.

[0108] The following describes the process of determining the power supply restoration strategy for each non-fault area according to the global network topology description matrix of the active distribution network, the available state of the inverter-type distributed generator (IIDG) in each non-fault area, and the corresponding available power supply capacity in each non-fault area. In one embodiment, as Figure 7 shown, the steps in S200 above can be implemented in the following manner:

[0109] S210. For any non-fault area, when it is determined that the available state of the IIDG in the non-fault area is available, detect whether the power supply capacity of the IIDG meets the power supply capacity required by the loads in the non-fault area.

[0110] Optionally, the power supply capacity of the IIDG in the non-fault area can be understood as the electric energy that the IIDG can release to the loads consuming electricity in the non-fault area. Among them, the power supply capacity required by the loads in the non-fault area can be understood as the sum of the power supply capacities required by all loads in the non-fault area.

[0111] In practical applications, for any non-fault area, when the management master station determines that the available state of the IIDG in the non-fault area is available, it can use an electricity detector to detect whether the power supply capacity of the IIDG in the non-fault area meets the power supply capacity required by the loads in the non-fault area.

[0112] In addition, the management master station can send a power supply capacity detection instruction of the IIDG to the core STU in the non-fault area, instructing the core STU in the non-fault area to detect whether the power supply capacity of the IIDG meets the power supply capacity required by the loads in the non-fault area.

[0113] S220. If so, according to the global network topology description matrix, determine the restored closed state of the first switch for the IIDG to operate in the island mode. The first switch is a sectionalizing switch in the non-fault area.

[0114] Among them, when it is determined that the power supply capacity of the IIDG in the non-fault area meets the power supply capacity required by the loads in the non-fault area, the management master station can perform keyword extraction or screening processing on the global network topology description matrix, obtain the closing state (i.e., the original closing state) of the first switch (i.e., the IIDG access switch) in the non-fault area from the global network topology description matrix, and determine the restored closing state of the first switch when the IIDG is in the island operation mode according to the original closing state of the first switch.

[0115] In one embodiment, the method for determining the restored closing state of the first switch when the IIDG is in the island operation mode according to the original closing state of the first switch can be to pre-train an algorithm model, and then input the original closing state of the first switch into the algorithm model, and the algorithm model outputs the restored closing state of the first switch when the IIDG is in the island operation mode.

[0116] In another embodiment, the method for determining the restored closing state of the first switch when the IIDG is in the island operation mode according to the original closing state of the first switch can also be to perform a search process according to the original closing state of the first switch to obtain the restored closing state of the first switch when the IIDG is in the island operation mode.

[0117] S230. Generate a power supply restoration strategy for the non-fault area according to the restored closing state of the first switch.

[0118] In practical applications, the management master station can create rules according to the restored closing state of the first switch according to the preset restoration strategy to formulate the power supply restoration strategy for the non-fault area. Alternatively, the management master station can call a power supply restoration strategy creation tool, input the restored closing state of the first switch into the power supply restoration strategy creation tool, and the power supply restoration strategy creation tool outputs the power supply restoration strategy for the non-fault area.

[0119] It should be noted here that when the power supply capacity of the IIDG in the non-fault area meets the power supply capacity required by the loads in the non-fault area, the IIDG can be given priority to restore power supply to the loads in the non-fault area to save the power of the main network power supply.

[0120] In one embodiment, after performing the steps in the above S210, as Figure 8 shown, the above method may further include:

[0121] S240. When it is determined that the available state of the IIDG is available and the power supply capacity of the IIDG does not meet the power supply capacity required by the loads in the non-fault area, according to the global network topology description matrix, determine the restored closed state of the first switch for the IIDG to operate in the island mode and the restored closed state of the downstream tie switch of the target core STU in the active distribution network. Wherein, the target core STU is any core STU.

[0122] Specifically, when it is determined that the available state of the IIDG is available and the power supply capacity of the IIDG does not meet the power supply capacity required by the loads in the non-fault area, it can be considered to jointly supply power to the loads in the non-fault area through the IIDG in the non-fault area and the main network power supply. At this time, keyword extraction or screening processing can be performed on the global network topology description matrix, and the original closed state of the first switch in the non-fault area and the original closed state of the downstream tie switch of the target core STU in the active distribution network that controls the main network power supply to the loads in the non-fault area can be obtained from the global network topology description matrix. Then, determine the restored closed state of the first switch for the IIDG in the non-fault area to operate in the island mode according to the original closed state of the first switch, and determine the restored closed state of the downstream tie switch of the target core STU in the active distribution network according to the original closed state of the downstream tie switch of the target core STU.

[0123] In one embodiment, the method for determining the restored closed state of the first switch for the IIDG in the non-fault area to operate in the island mode according to the original closed state of the first switch can be to pre-train an algorithm model, and then input the original closed state of the first switch into the algorithm model, and the algorithm model outputs the restored closed state of the first switch for the IIDG in the non-fault area to operate in the island mode.

[0124] In another embodiment, the method for determining the restored closed state of the first switch for the IIDG in the non-fault area to operate in the island mode according to the original closed state of the first switch can also be to perform a search process according to the original closed state of the first switch to obtain the restored closed state of the first switch for the IIDG in the non-fault area to operate in the island mode.

[0125] Wherein, the above-mentioned target core STU can be the core STU in any dynamic partition of the active distribution network. Optionally, the original closed state of the first switch and the restored closed state of the first switch may be the same or different.

[0126] It should be noted here that when the available state of the IIDG in the non-fault area is available, the IIDG can form a corresponding IIDG island. Among them, the IIDG island operation can make full use of the power generation capacity of the IIDG and give full play to the IIDG's support capacity for the voltage of the active distribution network, so as to save the transferable spare capacity of the upstream tie switch of the target core STU that controls the power supply of the main grid.

[0127] Among them, according to the capacity constraint condition of island division (such as the following formula (4)), Figure 9 The failover system shown is divided into two pre-defined island areas.

[0128] (4)

[0129] Indicates the power of the load that loses power in the preset island area. Indicates the active output of IIDG in the preset island area. Indicates the island stability coefficient. Optionally, the island stability coefficient can ensure the stability of the island operation when there is a sudden load change in the preset island area.

[0130] In the event of a fault in the active distribution network, the IIDGs in the two preset island areas achieve power restoration as follows:

[0131] (1) When the fault location is at f1, STU4 can control S41 to disconnect and STU5 can control S51 to disconnect, so as to isolate the fault area between S41 and S51. IIDG1 and IIDG2 can realize the grid-connected operation of two preset island areas. The core STUs in the two preset island areas can control the boundary switches of their respective preset island areas to close, so that the two preset island areas can be grid-connected and operated;

[0132] (2) When the fault location is at f2, STU5 can control S52 to disconnect and STU7 can control S71 to disconnect, so as to isolate the fault area between S52 and S71 and reduce the range of the load that loses power in the active power distribution source. Among them, the integrity of the preset island area where IIDG1 is located is destroyed, and the load at STU5 can continue to be restored by the main grid power supply. IIDG1 is located upstream of the fault area, and the load at STU7 needs the transferable spare capacity of the upstream tie switch S31 to restore power. At the same time, IIDG2 can restore power to the load in the preset island area to which it belongs.

[0133] (3)When the fault location is at f3, STU7 can control S72 to disconnect and STU8 can control S81 to disconnect to isolate the fault area between S72 and S81. Among them, the loads at STU5 and STU7 can be restored power supply by the main grid power supply and IIDG1 together. At the same time, IIDG2 can restore power supply to the loads within its preset island area.

[0134] S250. Generate a power supply restoration strategy for the non-fault area according to the restored closed state of the first switch and the restored closed state of the downstream tie switch.

[0135] In practical applications, the management master station can construct multiple candidate power supply restoration strategies within the non-fault area according to the restored closed state of the first switch and the restored closed state of the downstream tie switch, and then select an optimal power supply restoration strategy from the multiple candidate power supply restoration strategies as the power supply restoration strategy for the non-fault area.

[0136] It should be noted here that in the case where the power supply capacity of the IIDG within the non-fault area does not meet the power supply capacity required by the loads within the non-fault area, priority can be given to allowing the IIDG within the non-fault area to restore as many and important de-energized loads as possible within the non-fault area.

[0137] In one embodiment, after performing the steps in S210 above, as Figure 10 shown, the above method may further include:

[0138] S260. When it is determined that the available state of the IIDG within the non-fault area is unavailable, determine whether the transferable standby capacity meets the load restoration conditions within the non-fault area according to the transferable standby capacity of the downstream tie switch of the target core STU and the power supply capacity required by the loads within the non-fault area.

[0139] In practical applications, when it is determined that the available state of the IIDG within the non-fault area is unavailable, the management master station can compare the transferable standby capacity of the downstream tie switch of the target core STU and the power supply capacity required by the loads within the non-fault area to determine whether the transferable standby capacity meets the load restoration conditions within the non-fault area.

[0140] Among them, the load restoration conditions may include that the transferable standby capacity of the downstream tie switch of the target core STU is greater than the power supply capacity required by the loads within the non-fault area. Optionally, the downstream tie switch of the target core STU can be one or more; when there are multiple downstream tie switches of the target core STU, the downstream tie switch with the largest transferable standby capacity can be selected to restore power supply to the loads within the non-fault area.

[0141] It should be noted here that the management master station can send a power supply restoration instruction to the core STU in the area where the downstream tie switch with the largest transferable spare capacity is located, so as to instruct the core STU to control the downstream tie switch to restore power supply to the loads in the non-fault area. At the same time, the management master station can send a restoration suspension instruction to the core STUs in the areas where other downstream tie switches are located, so as to instruct other core STUs to control other downstream tie switches to stop restoring power supply to the loads in the non-fault area.

[0142] Among them, the transferable spare capacity of the downstream tie switch can be equal to ; U N represents the rated voltage value of the feeder nodes in the non-fault area, and I tr represents the maximum transfer current value of the feeder nodes; P IIDG represents the sum of the rated power generation of the IIDGs operating in island mode in the non-fault area, and P M represents the power supply of the area where the upstream tie switch is located.

[0143] S270. If satisfied, determine the restored closed state of the downstream tie switch according to the global network topology description matrix.

[0144] Specifically, when it is determined that the transferable spare capacity meets the load restoration conditions in the non-fault area, the management master station can perform keyword extraction or screening processing on the global network topology description matrix, obtain the original closed state of the downstream tie switch of the target core STU from the global network topology description matrix, and determine the restored closed state of the downstream tie switch according to the original closed state of the downstream tie switch of the target core STU.

[0145] Optionally, the original closed state of the downstream tie switch and the restored closed state of the downstream tie switch may be the same or different.

[0146] S280. Generate a power supply restoration strategy for the non-fault area according to the restored closed state of the downstream tie switch.

[0147] Furthermore, multiple candidate power supply restoration strategies can be constructed according to the restored closed state of the downstream tie switch of the target core STU, and an optimal power supply restoration strategy can be selected from the multiple candidate power supply restoration strategies as the power supply restoration strategy for the non-fault area.

[0148] Among them, the method of selecting an optimal power supply restoration strategy from multiple candidate power supply restoration strategies can be to select the candidate power supply restoration strategy corresponding to the smallest f value from multiple f values as the optimal power supply restoration strategy according to the f value corresponding to each candidate power supply restoration strategy. Optionally, The value can be expressed as:

[0149] (5)

[0150] Among them, represents the set of all nodes in the active distribution network, N represents the total number of nodes, represents the loss of power outage compensation at node i, represents the weight coefficient of the load at node i, represents the power of the load at node i.

[0151] In addition, in order to ensure the continuous stable operation of the active distribution network after a fault occurs, the power restoration strategy adopted during the power restoration process in the non-fault area needs to meet the following constraint conditions:

[0152] (1) Line power flow constraint

[0153] (6)

[0154] Among them, N represents the total number of nodes in the active distribution network, , respectively represent the active power and reactive power injected at node i in the active distribution network; , , respectively represent the equivalent conductance, equivalent susceptance, and voltage phase angle difference of the connected branch between two adjacent nodes (node i and node j) in the active distribution network; , respectively represent the voltage amplitudes of nodes i and j in the active distribution network;

[0155] (2) Power supply capacity constraint

[0156] (7)

[0157] In the formula: represents the total power of the load in the non-fault area; represents the total sum of the transferable backup capacity of the tie switches in the non-fault area for power restoration;

[0158] (3) Node voltage constraint

[0159] (8)

[0160] Among them, U min , U max respectively represent the lower limit and upper limit of the voltage at node i;

[0161] (4) Branch current constraint

[0162] (9)

[0163] Among them, I ijrepresents the current value of the connected branch between two adjacent nodes (node i and node j) in the active distribution network, I max represents the upper limit of the current allowed to flow through this connected branch;

[0164] (5) Radial topology constraint

[0165] (10)

[0166] Among them, represents the line in the active distribution network where power supply restoration is completed, represents the line in the active distribution network that operates in a radial topology.

[0167] In one embodiment, there are multiple downstream tie switches; after performing the steps in S210 above, as Figure 11 shown, the above method may further include:

[0168] S211. If not satisfied, then according to the power supply capacity required by the loads in the non-fault area, construct a main network power supply restoration model corresponding to each downstream tie switch in the non-fault area.

[0169] If the loads in the non-fault area need to have power supply restored simultaneously through multiple downstream tie switches of the target core STU, the multiple downstream tie switches can cooperate with each other to restore more and more important lost-power loads. At this time, a knapsack problem, that is, a main network power supply restoration model, can be constructed. Assume that the transferable spare capacity of each upstream tie switch is C, the total number of lost-power loads to be restored is n, the weight of lost-power load i is , the power of the load is , when calculating to load i, the total weight of the previous (i - 1) lost-power loads is , if it is selected to restore load i, the total weight of the previous i lost-power loads becomes , and the maximum of the two total weights is selected to determine the restoration closing state of each downstream tie switch. Among them, the main network power supply restoration model can be expressed as:

[0170] (11)

[0171] S212. According to the global network topology description matrix, use an improved genetic algorithm to solve the main network power supply restoration model to obtain the optimal restoration closing state of each downstream tie switch.

[0172] In practical applications, according to the global network topology description matrix, an improved genetic algorithm can be used to solve the main network power restoration model to obtain the optimal restored closed states of each downstream tie switch. Among them, in the improved genetic algorithm, the tie switches and sectionalizing switches in the non-fault area can be used as chromosomes for encoding to shorten the chromosome length and improve the convergence speed and operation efficiency. The execution steps of the improved genetic algorithm are described below:

[0173] Step 1: Use the available tie switches and sectionalizing switches in the non-fault area outside the IIDG island area in the active distribution network as the parameter set;

[0174] Step 2: Determine the network parameters of the non-fault area outside the IIDG island area, including power flow, voltage, current, switch status, etc.;

[0175] Step 3: Encode the chromosome using binary, where 0 and 1 represent the switch (including tie switch and sectionalizing switch) in the open state and closed state respectively. Among them, the genes on the chromosome are divided into two segments to represent two different types of tie switches and sectionalizing switches. At the same time, determine the number of individuals in the initial population, the length of the chromosome, the minimum number of iterations, etc. according to the global network topology description matrix of the active distribution network;

[0176] Step 4: Initialize the population, and the master station divides multiple populations according to the above information.

[0177] Step 5: Population evaluation, and the master station performs power flow calculation to obtain the individual fitness function in each evolution process.

[0178] Step 6: Perform iterative evolutionary operations of the improved genetic algorithm, and perform genetic operations such as selection, crossover, and mutation to obtain the next generation population;

[0179] Step 7: Determine whether the convergence condition is satisfied; if satisfied, the improved genetic algorithm terminates to obtain the optimal result; if not satisfied, return to Step 5 to continue the iteration until the convergence condition is satisfied.

[0180] S213: Generate a power supply restoration strategy for the non-fault area according to the optimal restored closed states of each downstream tie switch.

[0181] Furthermore, the master station can generate a power supply restoration strategy for the non-fault area according to the optimal restored closed states of each downstream tie switch in accordance with the restoration strategy formulation rules.

[0182] In the technical solution of the embodiment of the present application, the factor of saving the transferable standby capacity of the main network power supply can be considered. According to the power supply capacity required by the loads in the non-fault area, the available IIDGs in the non-fault area are preferentially used to restore power supply to the loads in the non-fault area. And when the power supply capacity of the IIDGs cannot meet the power supply capacity required by the loads in the non-fault area, then consider combining the main network power supply to jointly restore power supply to the loads in the non-fault area, so that the power supply restoration strategy for the non-fault area can reach the optimal, and improve the power supply reliability of the active distribution network.

[0183] In one embodiment, the embodiment of the present application further provides an active distribution network fault self-healing method based on an intelligent terminal unit, which is applied to a management master station in a fault self-healing system. The fault self-healing system further includes a plurality of core intelligent terminal units STU; the method includes the following processes:

[0184] (1) Determine the area between adjacent fault positions in the active distribution network as the fault area, and determine the area in the active distribution network except at least one fault area as the non-fault area;

[0185] (2) Obtain the real-time topology description matrix in each dynamic partition in the active distribution network sent by each core STU; wherein, the real-time topology description matrix in the dynamic partition is determined according to the topology description matrix in the dynamic partition and the corresponding switch state construction matrix;

[0186] (3) Determine the global network topology description matrix of the active distribution network according to each real-time topology description matrix;

[0187] (4) For any non-fault area, when it is determined that the available state of the IIDG in the non-fault area is available, detect whether the power supply capacity of the IIDG meets the power supply capacity required by the loads in the non-fault area;

[0188] (5) If so, determine the restored closed state of the first switch for the IIDG to operate in the island mode according to the global network topology description matrix; the first switch is the sectional switch in the non-fault area;

[0189] (6) Generate a power supply restoration strategy for the non-fault area according to the restored closed state of the first switch; the power supply restoration strategy includes the power supply states of each IIDG and the closed states of each downstream tie switch;

[0190] (7) When it is determined that the available state of the IIDG is available and the power supply capacity of the IIDG does not meet the power supply capacity required by the loads in the non-fault area, according to the global network topology description matrix, determine the restored closed state of the first switch for the IIDG to operate in the island mode and the restored closed state of the downstream tie switch of the target core STU in the active distribution network; according to the restored closed state of the first switch and the restored closed state of the downstream tie switch, generate a power supply restoration strategy for the non-fault area.

[0191] (8) When it is determined that the available state of the IIDG in the non-fault area is unavailable, determine whether the transferable standby capacity meets the load restoration conditions in the non-fault area according to the transferable standby capacity of the downstream tie switch of the target core STU and the power supply capacity required by the loads in the non-fault area; if it meets, according to the global network topology description matrix, determine the restored closed state of the downstream tie switch; according to the restored closed state of the downstream tie switch, generate a power supply restoration strategy for the non-fault area.

[0192] (9) If it does not meet, construct a main network power supply restoration model corresponding to each downstream tie switch in the non-fault area according to the power supply capacity required by the loads in the non-fault area; according to the global network topology description matrix, use the improved genetic algorithm to solve the main network power supply restoration model to obtain the optimal restored closed state of each downstream tie switch; according to the optimal restored closed state of each downstream tie switch, generate a power supply restoration strategy for the non-fault area.

[0193] (10) For any non-fault area, generate a closing switching instruction for at least one second switch in the non-fault area according to the power supply restoration strategy; the second switch is the downstream tie switch and / or sectionalizing switch of the core STU in the non-fault area.

[0194] (11) Send the closing switching instructions of each second switch to the core STU in the non-fault area, instructing the core STU to control the switching of the closing states of each second switch.

[0195] The execution process of the above steps (1) to (11) can specifically refer to the description of the above embodiments, and their implementation principles and technical effects are similar, so they will not be elaborated here.

[0196] It should be understood that although the steps in the flowcharts involved in the above embodiments are sequentially shown according to the indications of the arrows, these steps are not necessarily executed in the order indicated by the arrows. Unless there is a clear indication in this article, the execution of these steps has no strict order limit, and these steps can be executed in other orders. Moreover, at least a part of the steps in the flowcharts involved in the above embodiments may include multiple steps or multiple stages. These steps or stages are not necessarily executed at the same time, but can be executed at different times. The execution order of these steps or stages is not necessarily sequential, but can be executed alternately or in turn with at least a part of other steps or steps or stages in other steps.

[0197] Based on the same inventive concept, an embodiment of the present application also provides a device for self-healing of active distribution network faults based on an intelligent terminal unit for implementing the self-healing method of active distribution network faults based on an intelligent terminal unit involved above. The implementation solution provided by this device to solve problems is similar to the implementation solution described in the above method. Therefore, the specific limitations in one or more embodiments of the device for self-healing of active distribution network faults based on an intelligent terminal unit provided below can refer to the limitations on the self-healing method of active distribution network faults based on an intelligent terminal unit in the above text, and will not be repeated here.

[0198] In an exemplary embodiment, as Figure 12 shown, a device for self-healing of active distribution network faults based on an intelligent terminal unit is provided, including: a first determination module 11, a second determination module 12, and a fault self-healing module 13, where:

[0199] The first determination module 11 is configured to determine a plurality of non-fault regions and at least one fault region in the active distribution network according to at least one fault location in the active distribution network;

[0200] The second determination module 12 is configured to determine the power supply restoration strategy for each non-fault region according to the global network topology description matrix of the active distribution network, the available states of the inverter-type distributed power sources IIDGs in each non-fault region, and the corresponding available power supply capacities in each non-fault region; the corresponding available power supply capacity in a non-fault region includes at least one of the power supply capacity of the IIDG in the non-fault region and the transferable standby capacity of the downstream tie switch of the target core STU, and the power supply restoration strategy includes the power supply states of each IIDG and the closing states of each downstream tie switch;

[0201] The fault self-healing module 13 is configured to perform fault self-healing on the loads in each non-fault region of the active distribution network according to the power supply restoration strategy.

[0202] The active distribution network fault self-healing device based on the intelligent terminal unit provided by the embodiment of the present application can be used to execute the technical solutions in the above-mentioned embodiment of the active distribution network fault self-healing method based on the intelligent terminal unit. Its implementation principle and technical effect are similar, and will not be elaborated here.

[0203] In one embodiment, the first determination module 11 is specifically configured to:

[0204] Determine the area between adjacent fault positions in the active distribution network as the fault area, and determine the area other than at least one fault area in the active distribution network as the non-fault area.

[0205] The active distribution network fault self-healing device based on the intelligent terminal unit provided by the embodiment of the present application can be used to execute the technical solutions in the above-mentioned embodiment of the active distribution network fault self-healing method based on the intelligent terminal unit. Its implementation principle and technical effect are similar, and will not be elaborated here.

[0206] In one embodiment, the active distribution network fault self-healing device based on the intelligent terminal unit further includes:

[0207] A description matrix acquisition module, configured to acquire the real-time topology description matrix in each dynamic partition of the active distribution network sent by each core STU; wherein, the real-time topology description matrix in the dynamic partition is determined according to the topology description matrix in the dynamic partition and the corresponding switch state construction matrix;

[0208] A description matrix determination module, configured to determine the global network topology description matrix of the active distribution network according to each real-time topology description matrix.

[0209] The active distribution network fault self-healing device based on the intelligent terminal unit provided by the embodiment of the present application can be used to execute the technical solutions in the above-mentioned embodiment of the active distribution network fault self-healing method based on the intelligent terminal unit. Its implementation principle and technical effect are similar, and will not be elaborated here.

[0210] In one embodiment, the available power supply capacity corresponding to the non-fault area includes the power supply capacity of the IIDG in the non-fault area; the second determination module 12 includes: a detection unit, a first determination unit, and a first policy generation unit, wherein:

[0211] The detection unit is configured to, for any non-fault area, when determining that the available state of the IIDG in the non-fault area is available, detect whether the power supply capacity of the IIDG meets the power supply capacity required by the load in the non-fault area;

[0212] A first determination unit, configured to, when the detection result of the detection unit is satisfied, determine the restored closed state of the first switch for the IIDG to operate in the island mode according to the global network topology description matrix; the first switch is a sectional switch in the non-fault area;

[0213] A first policy generation unit, configured to generate a power supply restoration policy for the non-fault area according to the restored closed state of the first switch.

[0214] The active distribution network fault self-healing device based on the intelligent terminal unit provided by the embodiment of the present application can be used to execute the technical solutions in the above-mentioned embodiment of the active distribution network fault self-healing method based on the intelligent terminal unit of the present application. The implementation principle and technical effect are similar, and will not be described in detail here.

[0215] In one embodiment, the second determination module 12 further includes: a second determination unit and a second policy generation unit, where:

[0216] The second determination unit is configured to, when it is determined that the available state of the IIDG is available and the power supply capacity of the IIDG does not meet the power supply capacity required by the loads in the non-fault area, determine the restored closed state of the first switch for the IIDG to operate in the island mode and the restored closed state of the downstream tie switch of the target core STU in the active distribution network according to the global network topology description matrix;

[0217] The second policy generation unit is configured to generate a power supply restoration policy for the non-fault area according to the restored closed state of the first switch and the restored closed state of the downstream tie switch.

[0218] The active distribution network fault self-healing device based on the intelligent terminal unit provided by the embodiment of the present application can be used to execute the technical solutions in the above-mentioned embodiment of the active distribution network fault self-healing method based on the intelligent terminal unit of the present application. The implementation principle and technical effect are similar, and will not be described in detail here.

[0219] In one embodiment, the second determination module 12 further includes: a third determination unit, a fourth determination unit and a third policy generation unit, where:

[0220] The third determination unit is configured to, when it is determined that the available state of the IIDG in the non-fault area is unavailable, determine whether the transferable standby capacity meets the load restoration condition in the non-fault area according to the transferable standby capacity of the downstream tie switch of the target core STU and the power supply capacity required by the loads in the non-fault area;

[0221] The fourth determination unit is configured to, if it is satisfied, determine the restored closed state of the downstream tie switch according to the global network topology description matrix;

[0222] A third strategy generation unit, configured to generate a power supply restoration strategy for a non-fault area according to the restored closed state of a downstream tie switch.

[0223] The active distribution network fault self-healing device based on an intelligent terminal unit provided in an embodiment of the present application can be used to execute the technical solutions in the above-mentioned embodiment of the active distribution network fault self-healing method based on an intelligent terminal unit of the present application. The implementation principle and technical effect are similar, and will not be described in detail here.

[0224] In one embodiment, there are multiple downstream tie switches; the second determination module 12 further includes: a model construction unit, a solution unit, and a fourth strategy generation unit, where:

[0225] The model construction unit is configured to, if not satisfied, construct a main network power supply restoration model corresponding to each downstream tie switch in the non-fault area according to the power supply capacity required by the loads in the non-fault area.

[0226] The solution unit is configured to solve the main network power supply restoration model by using an improved genetic algorithm according to the global network topology description matrix, and obtain the optimal restored closed state of each downstream tie switch.

[0227] The fourth strategy generation unit is configured to generate a power supply restoration strategy for the non-fault area according to the optimal restored closed state of each downstream tie switch.

[0228] The active distribution network fault self-healing device based on an intelligent terminal unit provided in an embodiment of the present application can be used to execute the technical solutions in the above-mentioned embodiment of the active distribution network fault self-healing method based on an intelligent terminal unit of the present application. The implementation principle and technical effect are similar, and will not be described in detail here.

[0229] In one embodiment, the fault self-healing module 13 includes: an instruction generation unit and a state switching unit, where:

[0230] The instruction generation unit is configured to, for any non-fault area, generate a closing switching instruction for at least one second switch in the non-fault area according to the power supply restoration strategy; the second switch is a downstream tie switch and / or a sectionalizing switch of the core STU in the non-fault area.

[0231] The state switching unit is configured to send the closing switching instruction of each second switch to the core STU in the non-fault area, and instruct the core STU to control the closing state of each second switch to be switched.

[0232] The active distribution network fault self-healing device based on an intelligent terminal unit provided in an embodiment of the present application can be used to execute the technical solutions in the above-mentioned embodiment of the active distribution network fault self-healing method based on an intelligent terminal unit of the present application. The implementation principle and technical effect are similar, and will not be described in detail here.

[0233] Each module in the above-mentioned active distribution network fault self-healing device based on the intelligent terminal unit can be implemented in whole or in part by software, hardware, or a combination thereof. Each of the above modules can be embedded in the processor of the computer device in hardware form or be independent of it, or can be stored in the memory of the computer device in software form, so that the processor can call and execute the operations corresponding to each of the above modules.

[0234] In an exemplary embodiment, a computer device is provided. The computer device can be a server, and its internal structure diagram can be as Figure 13 shown. The computer device includes a processor, a memory, an input / output interface (Input / Output, abbreviated as I / O), and a communication interface. Among them, the processor, the memory, and the input / output interface are connected through a system bus, and the communication interface is connected to the system bus through the input / output interface. Among them, the processor of the computer device is used to provide computing and control capabilities. The memory of the computer device includes a non-volatile storage medium and an internal memory. The non-volatile storage medium stores an operating system, a computer program, and a database. The internal memory provides an environment for the operation of the operating system and the computer program in the non-volatile storage medium. The database of the computer device is used for the power supply restoration strategy of the non-fault area. The input / output interface of the computer device is used to exchange information between the processor and external devices. The communication interface of the computer device is used to communicate with external terminals through a network connection. When the computer program is executed by the processor, it implements an active distribution network fault self-healing method based on an intelligent terminal unit.

[0235] Those skilled in the art can understand that Figure 13 the structure shown in

[0236] is only a block diagram of some structures related to the solution of this application, and does not constitute a limitation on the computer device to which the solution of this application is applied. The specific computer device may include more or fewer components than those shown in the figure, or combine some components, or have different component arrangements.

[0236] In an exemplary embodiment, a computer device is further provided, including a memory and a processor. A computer program is stored in the memory. When the processor executes the computer program, the following steps are implemented:

[0237] Determine multiple non-fault areas and at least one fault area in the active distribution network according to at least one fault location in the active distribution network;

[0238] According to the global network topology description matrix of the active distribution network, the available states of the inverter-type distributed generation (IIDG) in each non-fault area, and the corresponding available power supply capacities in each non-fault area, determine the power supply restoration strategies for each non-fault area; the corresponding available power supply capacities in the non-fault area include at least one of the power supply capacities of the IIDG in the non-fault area and the transferable spare capacity of the downstream tie switch of the target core STU, and the power supply restoration strategies include the power supply states of each IIDG and the closing states of each downstream tie switch;

[0239] According to the power supply restoration strategies, perform fault self-healing on the loads in each non-fault area of the active distribution network.

[0240] In one embodiment, a computer-readable storage medium is further provided, on which a computer program is stored. When the computer program is executed by a processor, the following steps are implemented:

[0241] According to at least one fault location in the active distribution network, determine multiple non-fault areas and at least one fault area in the active distribution network;

[0242] According to the global network topology description matrix of the active distribution network, the available states of the inverter-type distributed generation (IIDG) in each non-fault area, and the corresponding available power supply capacities in each non-fault area, determine the power supply restoration strategies for each non-fault area; the corresponding available power supply capacities in the non-fault area include at least one of the power supply capacities of the IIDG in the non-fault area and the transferable spare capacity of the downstream tie switch of the target core STU, and the power supply restoration strategies include the power supply states of each IIDG and the closing states of each downstream tie switch;

[0243] According to the power supply restoration strategies, perform fault self-healing on the loads in each non-fault area of the active distribution network.

[0244] In one embodiment, a computer program product is further provided, including a computer program. When the computer program is executed by a processor, the following steps are implemented:

[0245] According to at least one fault location in the active distribution network, determine multiple non-fault areas and at least one fault area in the active distribution network;

[0246] According to the global network topology description matrix of the active distribution network, the available states of the inverter-type distributed generation (IIDG) in each non-fault area, and the corresponding available power supply capacities in each non-fault area, determine the power supply restoration strategies for each non-fault area; the corresponding available power supply capacities in the non-fault area include at least one of the power supply capacities of the IIDG in the non-fault area and the transferable spare capacity of the downstream tie switch of the target core STU, and the power supply restoration strategies include the power supply states of each IIDG and the closing states of each downstream tie switch;

[0247] According to the power supply restoration strategy, the loads in each non-fault area of the active distribution network are self-healed from faults.

[0248] Those of ordinary skill in the art can understand that all or part of the processes in the methods of the above embodiments can be completed by instructing relevant hardware through a computer program. The computer program can be stored in a non-volatile computer-readable storage medium. When the computer program is executed, it can include the processes of the embodiments of the above methods. Among them, any reference to a memory, database, or other medium used in the embodiments provided in this application can include at least one of non-volatile memory and volatile memory. Non-volatile memory can include read-only memory (ROM), magnetic tape, floppy disk, flash memory, optical memory, high-density embedded non-volatile memory, resistive random access memory (ReRAM), magnetoresistive random access memory (MRAM), ferroelectric random access memory (FRAM), phase change memory (PCM), graphene memory, etc. Volatile memory can include random access memory (RAM) or external cache memory, etc. By way of illustration and not limitation, RAM can be in various forms, such as static random access memory (SRAM) or dynamic random access memory (DRAM), etc. The databases involved in the embodiments provided in this application can include at least one of relational databases and non-relational databases. Non-relational databases can include distributed databases based on blockchain, etc., without limitation. The processors involved in the embodiments provided in this application can be general-purpose processors, central processors, graphics processors, digital signal processors, programmable logic devices, data processing logics based on quantum computing, artificial intelligence (AI) processors, etc., without limitation.

[0249] The technical features of the above embodiments can be combined arbitrarily. For the sake of brevity of description, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, it should be considered to be within the scope recorded in this application.

[0250] The above-described embodiments merely represent several implementation manners of the present application. The description thereof is relatively specific and detailed, but it should not be construed as a limitation to the patent scope of the present application. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present application, several modifications and improvements can still be made, and these all belong to the protection scope of the present application. Therefore, the protection scope of the present application shall be subject to the appended claims.

Claims

1. An active distribution network fault self-healing method based on an intelligent terminal unit, which is applied to a management master station in a fault self-healing system, and the fault self-healing system further includes a plurality of core intelligent terminal units STU; characterized in that, The method includes: Determining a plurality of non-fault areas and at least one fault area in the active distribution network according to at least one fault location in the active distribution network; Determining a power supply restoration strategy for each of the non-fault areas according to the global network topology description matrix of the active distribution network, the available states of the inverter-type distributed generators (IIDGs) in each of the non-fault areas, and the corresponding available power supply capacities in each of the non-fault areas; the corresponding available power supply capacity in the non-fault area includes at least one of the power supply capacity of the IIDG in the non-fault area and the transferable standby capacity of the downstream tie switch of the target core STU, and the power supply restoration strategy includes the power supply states of each of the IIDGs and the closing states of each of the downstream tie switches; Performing fault self-healing on the loads in each of the non-fault areas in the active distribution network according to the power supply restoration strategy.

2. The method according to claim 1, characterized in that, The determining a plurality of non-fault areas and at least one fault area in the active distribution network according to at least one fault location in the active distribution network includes: Determining the area between adjacent fault locations in the active distribution network as the fault area, and determining the area in the active distribution network other than the at least one fault area as the non-fault area.

3. The method according to claim 1 or 2, characterized in that The method further includes: Obtaining the real-time topology description matrix in each dynamic partition of the active distribution network sent by each of the core STUs; wherein, the real-time topology description matrix in the dynamic partition is determined according to the topology description matrix in the dynamic partition and the constructed matrix of the corresponding switch states; Determining the global network topology description matrix of the active distribution network according to each of the real-time topology description matrices.

4. The method according to claim 1 or 2, characterized in that, The corresponding available power supply capacity in the non-fault area includes the power supply capacity of the IIDG in the non-fault area; the determining a power supply restoration strategy for each of the non-fault areas according to the global network topology description matrix of the active distribution network, the available states of the inverter-type distributed generators (IIDGs) in each of the non-fault areas, and the corresponding available power supply capacities in each of the non-fault areas includes: For any non-fault area, when determining that the available state of the IIDG in the non-fault area is available, detecting whether the power supply capacity of the IIDG meets the power supply capacity required by the loads in the non-fault area; If so, determining the restored closing state of the first switch for the IIDG to operate in the island mode according to the global network topology description matrix; the first switch is the sectionalizing switch in the non-fault area; Generating a power supply restoration strategy for the non-fault area according to the restored closing state of the first switch.

5. The method according to claim 4, wherein The method further includes: When determining that the available state of the IIDG is available and the power supply capacity of the IIDG does not meet the power supply capacity required by the loads in the non-fault area, determining the restored closing state of the first switch for the IIDG to operate in the island mode and the restored closing state of the downstream tie switch of the target core STU in the active distribution network according to the global network topology description matrix; Generate a power supply restoration strategy for the non-fault area according to the restored closed state of the first switch and the restored closed state of the downstream tie switch.

6. The method according to claim 4, wherein The method further includes: When it is determined that the available state of the IIDG in the non-fault area is unavailable, determine whether the transferable spare capacity meets the load restoration conditions in the non-fault area according to the transferable spare capacity of the downstream tie switch of the target core STU and the power supply capacity required by the loads in the non-fault area; If it is satisfied, determine the restored closed state of the downstream tie switch according to the global network topology description matrix; Generate a power supply restoration strategy for the non-fault area according to the restored closed state of the downstream tie switch.

7. The method according to claim 6, wherein There are multiple downstream tie switches; the method further includes: If it is not satisfied, construct a main network power supply restoration model corresponding to each downstream tie switch in the non-fault area according to the power supply capacity required by the loads in the non-fault area; Solve the main network power supply restoration model by using an improved genetic algorithm according to the global network topology description matrix to obtain the optimal restored closed state of each downstream tie switch; Generate a power supply restoration strategy for the non-fault area according to the optimal restored closed state of each downstream tie switch.

8. The method according to claim 1 or 2, characterized in that, Performing fault self-healing on the loads in each non-fault area of the active distribution network according to the power supply restoration strategy includes: For any non-fault area, generate a closing switching instruction for at least one second switch in the non-fault area according to the power supply restoration strategy; the second switch is a downstream tie switch and / or a sectionalizing switch of the core STU in the non-fault area; Send the closing switching instructions of the second switches to the core STU in the non-fault area to instruct the core STU to control the switching of the closing states of the second switches.

9. An active distribution network fault self-healing device based on an intelligent terminal unit, characterized in that, The device includes: A first determination module, configured to determine multiple non-fault areas and at least one fault area in the active distribution network according to at least one fault location in the active distribution network; A second determination module, configured to determine a power supply restoration strategy for each non-fault area according to the global network topology description matrix of the active distribution network, the available state of the inverter-type distributed generation IIDG in each non-fault area, and the available power supply capacity corresponding to each non-fault area; the available power supply capacity corresponding to the non-fault area includes at least one of the power supply capacity of the IIDG in the non-fault area and the transferable spare capacity of the downstream tie switch of the target core STU, and the power supply restoration strategy includes the power supply states of the IIDGs and the closing states of the downstream tie switches; A fault self-healing module, configured to perform fault self-healing on the loads in each non-fault area of the active distribution network according to the power supply restoration strategy.

10. A computer device, comprising a memory and a processor, the memory storing a computer program, characterized in that, When the processor executes the computer program, it implements the steps of the method according to any one of claims 1 to 8.

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