Fault self-healing control method, device and equipment for connecting distributed power supply to power distribution network

Abstract

The application relates to a fault self-healing control method, device and equipment of a distributed power supply connected to a power distribution network, which comprises the following steps: firstly, obtaining the network frame topology structure of the distributed power supply connected to the power distribution network; then, configuring the power distribution terminal matched with the switch on the network frame topology structure; then, numbering each power distribution terminal and dividing the sub-network and area of the power distribution network according to the number; when the power distribution network is faulty, determining the power-off area and non-power-off area on the communication network architecture of the divided sub-network and area, determining the power supply line for restoring power supply to the non-power-off area on the communication network architecture of the divided sub-network and area, and closing the tie-in switch of the power supply line to restore power supply to the non-power-off area, so as to solve the power distribution network fault self-healing problem under the condition of the line load power supply line diversification and the topology structure complication of the high-permeation connection of the distributed power supply, improve the power supply reliability of the power distribution network, and reduce the power-off loss caused by the power distribution network fault.

Description

Technical Field

[0001] This application relates to the field of power distribution network automation technology, and in particular to a fault self-healing control method, device and equipment for distributed power sources connected to the power distribution network. Background Technology

[0002] The large-scale integration of clean energy into the power system and the extensive use of interactive facilities such as distributed energy, energy storage, electric vehicles, and smart electrical devices have changed the power flow and voltage distribution characteristics of traditional distribution networks. The randomness and intermittency of renewable energy also bring uncertainties to the operation and control of distribution networks. Ensuring the safe operation of the power grid is a challenge facing distribution networks.

[0003] Existing self-healing control technologies for distribution networks are only applicable to fault isolation and restoration of lines in single-ring networks. They lack effective methods for handling fault isolation and restoration of complex lines with multiple interconnections in situations where distributed power sources have high penetration. Summary of the Invention

[0004] This application provides a fault self-healing control method, apparatus, and equipment for distributed power sources connected to a distribution network, which solves the technical problem that fault isolation and recovery of distributed power sources connected to a distribution network with multiple interconnected and complex lines cannot be achieved using existing distribution network fault self-healing control technologies.

[0005] To achieve the above objectives, the embodiments of this application provide the following technical solutions:

[0006] On the one hand, a fault self-healing control method for distributed generation connected to the distribution network is provided, including the following steps:

[0007] Obtain the network topology of distributed power sources connected to the distribution network, configure corresponding distribution terminals for each switch on the distribution network according to the network topology, and obtain the communication network architecture of the distribution network.

[0008] Based on the line location of each power distribution terminal on the communication network architecture, the corresponding power distribution terminal is numbered and configured with a type to obtain the power distribution terminal number and type;

[0009] Based on the numbers of all the power distribution terminals, a recursive function is used to divide the communication network architecture into power supply networks and power supply areas, thereby obtaining each sub-network of the power distribution network and the area corresponding to each sub-network;

[0010] If a fault occurs in the distribution network and a fault signal is issued through the distribution terminal, two switches for fault clearing and isolation are determined according to the number of the distribution terminal corresponding to the fault signal as fault isolation switches. Through the fault isolation switches, the power outage area and the non-power outage area are determined on the communication network architecture that divides the subnets and areas, and the power demand of the non-power outage area is obtained.

[0011] On the communication network architecture that divides subnets and regions, search for one or more power supply lines connected to the tie switch of the non-power outage area. Based on one or more power supply lines and the power demand of the non-power outage area, use line screening rules to select the power supply line with the shortest line length. Close the tie switch of the power supply line to restore power supply to the non-power outage area.

[0012] The switches in the power distribution network include main switches, tie switches, sectionalizing switches, and distributed generation (DG) switches, and the types of power distribution terminals include main switch controllers, tie switch controllers, sectionalizing switch controllers, and DG switch controllers.

[0013] Preferably, the fault self-healing control method for distributed power generation connected to the distribution network includes: acquiring electrical quantity parameters of each sub-network, and calculating the open capacity of the first switch or islanded DG switch in the corresponding sub-network based on the electrical quantity parameters of each sub-network, wherein the electrical quantity parameters include the rated capacity of the switch and the maximum percentage of active power that can be opened.

[0014] Preferably, the fault self-healing control method for distributed power generation connected to the distribution network includes:

[0015] If no fault occurs in the distribution network, determine the corresponding agent controller for each subnet based on the first switch controller or the islanded DG switch controller for each subnet; and obtain the first line length for each subnet.

[0016] The open capacity corresponding to the subnet is transmitted to the agent controller of the subnet connected to the subnet through the agent controller;

[0017] The first line length corresponding to the subnet is transmitted to the tie switch controller of the subnet through the agent controller;

[0018] The first line length of the subnet is obtained by summing the line lengths configured for each power distribution terminal of the subnet.

[0019] Preferably, determining the power outage area and the non-power outage area in the communication network architecture that divides subnets and areas using the fault isolation switch includes:

[0020] The area where the fault isolation switch is located and the area between the fault isolation switch and the adjacent tie switch are designated as the power outage area.

[0021] The area where the lines between the fault isolation switch and each connecting switch in the communication network architecture are located is designated as the non-power outage area.

[0022] Preferably, the power supply lines with the shortest lengths are selected by using line selection rules based on the power demand of one or more of the power supply lines and the non-outage area, including:

[0023] If the open capacity of the power supply line is greater than the power demand of the non-outage area, then the power supply line shall be used as an alternative power supply line.

[0024] If there are multiple alternative power supply lines, obtain the second line length between the first switch or the islanded DG switch of each alternative power supply line and the nearest tie switch in the non-outage area; select the alternative power supply line with the shortest line length from all the second line lengths as the power supply line to supply power to the non-outage area.

[0025] If there is an alternative power supply line, then the alternative power supply line shall be used as the power supply line to supply power to the non-outage area.

[0026] Preferably, the communication network architecture is divided into power supply subnetworks and power supply areas using a recursive function based on the numbering of all the power distribution terminals, resulting in each subnetwork of the power distribution network and the area corresponding to each subnetwork, including:

[0027] Construct a directed tree of the power distribution network based on the communication network architecture and the numbering of all the power distribution terminals;

[0028] Using the first switch of the distribution network or the DG switch operating in islanded mode as the root node, a recursive function is used to perform path search on the directed tree to obtain each subnetwork of the distribution network.

[0029] The directed tree divides the subnet into multiple different subnet regions, with the first switch or the DG switch operating in an islanded manner in each subnet as the starting point and the tie switch connected to the subnet as the ending point.

[0030] Each subnet area is divided into power outage areas and non-power outage areas based on whether it is powered on, and each subnet area is divided into power-connected areas and isolated areas based on whether it has power access.

[0031] On the other hand, a fault self-healing control device for distributed power sources connected to the distribution network is provided, including a data acquisition module, a configuration numbering module, a division module, a fault isolation module and a power restoration module;

[0032] The data acquisition module is used to acquire the network topology of the distributed power source connected to the distribution network, and configure corresponding distribution terminals for each switch on the distribution network according to the network topology to obtain the communication network architecture of the distribution network.

[0033] The configuration numbering module is used to number and configure the corresponding power distribution terminal according to the line location of each power distribution terminal on the communication network architecture, so as to obtain the number and type of the power distribution terminal;

[0034] The partitioning module is used to partition the communication network architecture into power supply networks and power supply areas based on the numbers of all the power distribution terminals using a recursive function, thereby obtaining each subnetwork of the power distribution network and the area corresponding to each subnetwork.

[0035] The fault isolation module is used to send a fault signal through the power distribution terminal when a fault occurs in the power distribution network, determine two switches for fault clearing and isolation based on the number of the power distribution terminal corresponding to the fault signal, and determine the power outage area and non-power outage area in the communication network architecture that divides the subnets and areas through the fault isolation switches, and obtain the power demand of the non-power outage area.

[0036] The power restoration module is used to search for one or more power supply lines connected to the tie switch of the non-outage area on the communication network architecture that divides the subnets and areas, and to filter them according to the power demand of the one or more power supply lines and the non-outage area using line filtering rules to obtain the power supply line with the shortest line length; and to close the tie switch of the power supply line to restore power to the non-outage area.

[0037] The switches in the power distribution network include main switches, tie switches, sectionalizing switches, and distributed generation (DG) switches, and the types of power distribution terminals include main switch controllers, tie switch controllers, sectionalizing switch controllers, and DG switch controllers.

[0038] Preferably, the fault self-healing control device for distributed power supply access to the distribution network includes a capacity calculation module. The capacity calculation module is used to obtain the electrical quantity parameters of each sub-network and calculate the open capacity of the first switch or islanded DG switch in the corresponding sub-network based on the electrical quantity parameters of each sub-network. The electrical quantity parameters include the rated capacity of the switch and the maximum percentage of active power that can be opened.

[0039] Preferably, the power restoration module is further configured to: select a power supply line as a candidate power supply line if the open capacity of the power supply line is greater than the power demand of the non-outage area; if multiple candidate power supply lines exist, obtain the second line length between the first switch or the islanded DG switch of each candidate power supply line and the nearest tie switch in the non-outage area; select the candidate power supply line with the shortest line length from all the second line lengths as the power supply line to supply power to the non-outage area; if only one candidate power supply line exists, use that candidate power supply line to supply power to the non-outage area.

[0040] On the other hand, a terminal device is provided, including a processor and a memory;

[0041] The memory is used to store program code and transmit the program code to the processor;

[0042] The processor is used to execute the fault self-healing control method for distributed power source access to the distribution network as described above, according to the instructions in the program code.

[0043] This invention relates to a fault self-healing control method, apparatus, and equipment for distributed power generation connected to a distribution network. The method includes: acquiring the network topology of the distributed power generation connected to the distribution network; configuring corresponding distribution terminals for each switch on the distribution network according to the network topology to obtain the communication network architecture of the distribution network; numbering and configuring the corresponding distribution terminals according to their line location on the communication network architecture to obtain the terminal number and type; using a recursive function to divide the communication network architecture into power supply subnetworks and power supply areas based on the numbering of all distribution terminals to obtain the various subnetworks of the distribution network and the areas corresponding to each subnetwork; if the distributed power generation is connected to the distribution network... When a power grid fault occurs, a fault signal is sent through the distribution terminal. Based on the number of the distribution terminal corresponding to the fault signal, two switches for fault clearing and isolation are identified as fault isolation switches. Through the fault isolation switches, the power outage area and the non-power outage area are determined in the communication network architecture, and the power demand of the non-power outage area is obtained. One or more power supply lines connected to the tie switch of the non-power outage area are searched in the communication network architecture. Based on the power demand of one or more power supply lines and the non-power outage area, line screening rules are used to select the power supply line with the shortest line length. The tie switch of the power supply line is closed to restore power supply to the non-power outage area. As can be seen from the above technical solutions, the embodiments of this application have the following advantages: The fault self-healing control method for distributed power sources connected to the distribution network first obtains the network topology of the distributed power source connected to the distribution network, then configures distribution terminals that match the switches on the network topology, and then numbers each distribution terminal and divides the distribution network into subnets and regions according to the number; when a fault occurs in the distribution network, the outage area and non-outage area are determined on the communication network architecture of the subnets and regions, and the power supply line to restore power to the non-outage area is determined on the communication network architecture of the subnets and regions, and the tie switch of the power supply line is closed to restore power to the non-outage area. This solves the problem of distribution network fault self-healing under the conditions of diversified power supply lines and complex topology when the distributed power source has high penetration access, improves the reliability of power supply in the distribution network, reduces the power outage losses caused by the distribution network fault, and solves the technical problem that fault isolation and restoration of the distribution network with distributed power source connected to multiple complex lines cannot be achieved by the existing distribution network fault self-healing control technology. Attached Figure Description

[0044] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0045] Figure 1 This is a flowchart illustrating the steps of the fault self-healing control method for distributed power source access to the distribution network as described in the embodiments of this application;

[0046] Figure 2 This is a directed tree graph defining each switch type in the distribution network in the fault self-healing control method for distributed power source access to the distribution network described in the embodiments of this application;

[0047] Figure 3 This is an adjacency list diagram of the directed tree of the distribution network topology in the fault self-healing control method for distributed power source access to the distribution network described in the embodiments of this application.

[0048] Figure 4 This is a regional division diagram of the distribution network topology in the fault self-healing control method for distributed power source access to the distribution network described in the embodiments of this application;

[0049] Figure 5 This is a schematic diagram of the fault self-healing control device for distributed power source access to the distribution network as described in the embodiments of this application. Detailed Implementation

[0050] To make the inventive objectives, features, and advantages of this application more apparent and understandable, the technical solutions in the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the embodiments described below are only some embodiments of this application, and not all embodiments. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0051] In the description of the embodiments of this application, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the embodiments of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0052] In the embodiments of this application, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. For those skilled in the art, the specific meaning of the above terms in the embodiments of this application can be understood according to the specific circumstances.

[0053] Patent terminology used in this application:

[0054] The first switch refers to the switch on one side of a power distribution network line that is connected to the power source.

[0055] A tie switch is a switch on a power distribution network that has voltage on both sides and is in the open state.

[0056] DG switch refers to the switch for connecting distributed generation sources to the grid on the distribution network.

[0057] Section switches refer to switches on other main lines of a distribution network.

[0058] This application provides a fault self-healing control method, apparatus, and equipment for distributed power sources connected to a distribution network, which solves the technical problem that fault isolation and recovery of distributed power sources connected to a distribution network with multiple interconnected and complex lines cannot be achieved using existing distribution network fault self-healing control technologies.

[0059] Example 1:

[0060] Figure 1 This is a flowchart illustrating the steps of the fault self-healing control method for distributed power source access to the distribution network described in this application embodiment. Figure 2 This is a directed tree graph defining each switch type in the distribution network in the fault self-healing control method for distributed power source access to the distribution network described in the embodiments of this application. Figure 2 In the diagram, FSB1~FSB4 are the distribution terminals (also known as the first switch controllers) corresponding to the first switch, BC1~BC4 are the distribution terminals (also known as the tie switch controllers) corresponding to the tie switches, BS1~BS12 are the distribution terminals (also known as the sectional switch controllers) corresponding to the sectional switches, and DGB1~DGB3 are the distribution terminals (also known as the DG switch controllers) corresponding to the DG switches.

[0061] like Figure 1 and Figure 2 As shown in the figure, this application provides a fault self-healing control method for distributed power generation connected to a distribution network, including the following steps:

[0062] S1. Obtain the network topology of distributed power sources connected to the distribution network, configure corresponding distribution terminals for each switch on the distribution network according to the network topology, and obtain the communication network architecture of the distribution network.

[0063] It should be noted that in step S1, the topology of the distributed power supply network is obtained, and a distribution terminal is configured for each switch on the distribution network according to the topology, thus constructing a communication network architecture for the distribution network. In this embodiment, the distribution terminal communicates with adjacent distribution terminals in real time via optical fiber or wireless communication networks, transmitting communication information, including switch signals and analog signals on the distribution network. Each distribution terminal can transmit communication information transmitted by other distribution terminals to the next adjacent distribution terminal. For example, if the intermediate distribution terminal B is adjacent to distribution terminals A and C, and distribution terminal B can achieve peer-to-peer communication with adjacent distribution terminals A and C respectively, then distribution terminal B can transmit information from distribution terminal A to distribution terminal C. The switches in the distribution network include the first switch, tie switches, sectionalizing switches, and distributed generation (DG) switches.

[0064] S2. Number and configure the corresponding power distribution terminal according to its location on the communication network architecture to obtain the power distribution terminal number and type.

[0065] It should be noted that in step S2, each distribution terminal is numbered according to the line location of the switch corresponding to it in the communication network architecture. These numbers are non-repeating and unordered, facilitating the subsequent division of subnets and areas within the distribution network. Furthermore, the type of distribution terminal is determined based on the type of switch. Distribution terminal types include First Switch Controller (FBS), Tie Switch Controller (BC), Section Switch Controller (BS), and DG Switch Controller (DGB). In this embodiment, distribution terminals configured with the same switch type on the distribution network also have the same type. In this fault self-healing control method for distributed power supply access to the distribution network, the distribution terminal number can serve as the peer-to-peer communication address for each distribution terminal on the distribution network, allowing each distribution terminal to identify adjacent distribution terminals through its number.

[0066] Figure 3 This is an adjacency list diagram of the directed tree structure of the distribution network topology in the fault self-healing control method for distributed power source access to the distribution network described in the embodiments of this application.

[0067] S3. Based on the number of all distribution terminals, a recursive function is used to divide the communication network architecture into power supply networks and power supply areas, resulting in each subnetwork of the distribution network and the area corresponding to each subnetwork.

[0068] It should be noted that in step S3, the communication network of the distribution network is divided into subnets and regions based on the communication network architecture of the distribution network after step S2, resulting in the following... Figure 2 and Figure 3 The diagram shows the various subnets of the distribution network and the corresponding regions for each subnet. In this embodiment, the fault self-healing control method for distributed generation access to the distribution network uses a directed tree to display the results of the subnet and region division of the distribution network.

[0069] S4. If a fault occurs in the distribution network and a fault signal is issued through the distribution terminal, the two switches for fault clearing and isolation are determined according to the number of the distribution terminal corresponding to the fault signal. The power outage area and the non-power outage area are determined in the communication network architecture that divides the subnet and the area through the fault isolation switch, and the power demand of the non-power outage area is obtained.

[0070] It should be noted that in step S4, the outage area and non-outage area of ​​the distribution network are first determined according to the fault situation of the distribution network; then the power demand of the non-outage area is obtained to provide a basis for subsequent selection of power supply lines to restore the non-outage area.

[0071] S5. On the communication network architecture that divides subnets and regions, search for one or more power supply lines connected to the tie switch of the non-outage area. Based on the power demand of one or more power supply lines and the non-outage area, use line screening rules to select the power supply line with the shortest line length. Close the tie switch of the power supply line to restore power supply to the non-outage area.

[0072] It should be noted that in step S5, there may be more than one power supply line in the distribution network to restore power to the non-outage area. Therefore, it is necessary to select the power supply line that meets the line selection rules and has the shortest line length from the multiple power supply lines. Then, the tie switch of the power supply line is closed to restore power to the non-outage area.

[0073] This application provides a fault self-healing control method for distributed power generation connected to a distribution network. The method includes: acquiring the network topology of the distributed power generation connected to the distribution network; configuring corresponding distribution terminals for each switch on the distribution network according to the network topology to obtain the communication network architecture of the distribution network; numbering and configuring the corresponding distribution terminals according to their line location on the communication network architecture to obtain the terminal number and type; and using a recursive function to divide the communication network architecture into power supply subnets and power supply areas based on the numbers of all distribution terminals to obtain the various subnets of the distribution network and the area corresponding to each subnet. When a fault occurs in the distribution network, a fault signal is sent through the distribution terminal. Based on the number of the distribution terminal corresponding to the fault signal, two switches for fault clearing and isolation are identified as fault isolation switches. Through the fault isolation switches, the power outage area and the non-power outage area are determined in the communication network architecture, and the power demand of the non-power outage area is obtained. One or more power supply lines connected to the tie switch of the non-power outage area are searched in the communication network architecture. Based on the power demand of one or more power supply lines and the non-power outage area, line screening rules are used to select the power supply line with the shortest line length. The tie switch of the power supply line is closed to restore power supply to the non-power outage area. This fault self-healing control method for distributed generation access to the distribution network first obtains the network topology of the distributed generation access to the distribution network, then configures distribution terminals matched with switches on the network topology, and then numbers each distribution terminal and divides the distribution network into subnets and areas according to the numbering; when a fault occurs in the distribution network, the outage area and non-outage area are determined on the communication network architecture of the subnets and areas, and the power supply line to restore power to the non-outage area is determined on the communication network architecture of the subnets and areas, and the tie switch of the power supply line is closed to restore power to the non-outage area. This solves the problem of distribution network fault self-healing under the conditions of diversified power supply lines and complex topology when distributed generation is highly penetrated, improves the power supply reliability of the distribution network, reduces power outage losses caused by distribution network faults, and solves the technical problem that fault isolation and restoration of distribution networks with distributed generation access to multiple complex lines cannot be achieved by existing distribution network fault self-healing control technologies.

[0074] It should be noted that this fault self-healing control method for distributed generation access to the distribution network is applicable to distribution networks with distributed generation access and multiple interconnection modes.

[0075] In one embodiment of this application, the fault self-healing control method for distributed power generation connected to the distribution network includes: obtaining electrical quantity parameters of each sub-network, and calculating the open capacity of the first switch or islanded DG switch in the corresponding sub-network based on the electrical quantity parameters of each sub-network. The electrical quantity parameters include the rated capacity of the switch and the maximum percentage of active power that can be opened.

[0076] It should be noted that the opening capacity of the first switch or islanded DG switch in the corresponding subnet is calculated based on the rated capacity and the maximum percentage of active power that can be opened according to the electrical quantity parameters of each subnet, i.e., Poc=Pr×K, where Poc is the opening capacity of the first switch or islanded DG switch in the subnet, in kW; Pr is the rated capacity of the switch, in kW; and K is the maximum percentage of active power that can be opened by the switch, in kW.

[0077] In one embodiment of this application, the fault self-healing control method for distributed power generation connected to the distribution network includes:

[0078] If no fault occurs in the distribution network, determine the corresponding agent controller for each subnet based on the first switch controller or the DG switch controller operating in an islanded manner; and obtain the first line length for each subnet.

[0079] The open capacity of the corresponding subnet is transmitted through this agent controller to the agent controller of the subnet connected to that subnet;

[0080] The first line length of the corresponding subnet is transmitted to the tie switch controller of the subnet through this agent controller;

[0081] The first line length of the subnet is obtained by summing the line lengths configured for each power distribution terminal of the subnet.

[0082] It should be noted that the local agent controller of each subnet is as follows: Figure 2 As shown in FBS1, FBS2, FBS3, FBS4, and DGB3, this proxy controller can collect the available capacity of each subnet in real time and record the first line length between the recorded subnets. The line length stored on adjacent distribution terminals needs to be accumulated after passing through each switch controller. Once the proxy controller of each subnet receives the data, it can stop the communication between the distribution terminals. In this fault self-healing control method for distributed power access to the distribution network, under normal operating conditions of the distribution network, each distribution terminal in the subnet sends its stored available power capacity to adjacent distribution terminals via peer-to-peer communication. The adjacent distribution terminals forward the data to the next level of adjacent switch until forwarding stops at the proxy controller of that subnet. Each distribution terminal is configured with the line length between itself and its upstream adjacent distribution terminal. The line lengths configured by each distribution terminal are accumulated in the tie switch controller to obtain the first line length of each subnet. Figure 2 As shown, in each subnet, along the direction from the first switch to the tie switch, the left end of each distribution terminal's adjacent node is the node of the upper adjacent distribution terminal, and the right end is the node of the lower adjacent distribution terminal.

[0083] Figure 4This is a regional division diagram of the distribution network topology in the fault self-healing control method for distributed power source access to the distribution network described in the embodiments of this application.

[0084] like Figure 4 As shown, in one embodiment of this application, determining the power outage area and the non-power outage area in a communication network architecture that divides subnets and areas using a fault isolation switch includes:

[0085] The area where the fault disconnect switch is located and the area between the fault disconnect switch and the adjacent tie switch are designated as the power outage area.

[0086] The area where the lines between the fault isolation switch and each tie switch in the communication network architecture are located is designated as the non-power outage area.

[0087] It should be noted that when a fault occurs in the distribution network, all switches at both ends of the fault location will trip to isolate the fault. The corresponding distribution terminals, depending on the tripping conditions, will send fault clearing and fault isolation signals to the local agent controller within the subnet via peer-to-peer communication. Upon receiving the fault clearing and fault isolation signals, the local agent controller within the subnet will retrieve the numbers of the clearing and isolation switches. If both switch numbers belong to the same subnet, the line between these two switches and the line between the clearing switch and its adjacent tie switch are considered a power outage area. The lines between the clearing switch and each tie switch, or the lines between the clearing switch and its adjacent tie switch, are considered non-power outage areas. In this embodiment, as... Figure 4 As shown, a fault occurs between sectionalizing switch 2 and sectionalizing switch 9. According to the fault self-healing control method for distributed power supply access to the distribution network, the distribution terminal BS1 configured for sectionalizing switch 2 sends a fault clearing signal, and the distribution terminal BS2 configured for sectionalizing switch 9 sends a fault isolation signal. After sectionalizing switches 2 and 9 trip, a fault-related power outage area and a non-fault-related power outage area are formed within the communication network architecture. The local agent controller FBS1 within subnet 1 receives the fault signals from the corresponding distribution terminals of sectionalizing switches 2 and 9. Using the fault self-healing control method for distributed power supply access to the distribution network, it determines the areas containing the lines between sectionalizing switches 2 and 9 and the lines between sectionalizing switch 2 and tie switch 3 as power outage areas, and the areas containing the lines between sectionalizing switch 9 and tie switch 11 and the lines between sectionalizing switch 9 and tie switch 15 as non-power outage areas. After the non-outage area is determined, once the fault isolation of sectionalizing switch 9 is successful, the real-time power at the moment before the fault is taken as the power demand of the non-outage area, and the power demand of the non-outage area is sent to the local agent controller (also known as the distribution terminal) FBS1 of subnet 1 through the distribution terminal BS2 corresponding to sectionalizing switch 9.

[0088] like Figure 4 As shown, in one embodiment of this application, the power supply line with the shortest length is obtained by filtering according to the power demand of one or more power supply lines and non-outage areas using line filtering rules, including:

[0089] If the open capacity of the power supply line is greater than the power demand of the non-outage area, then the power supply line shall be used as the alternative power supply line.

[0090] If there are multiple alternative power supply lines, obtain the second line length between the first switch or the isolated DG switch of each alternative power supply line and the nearest tie switch in the non-outage area; select the alternative power supply line with the shortest line length from all the second line lengths as the power supply line to supply power to the non-outage area.

[0091] If there is an alternative power supply line, then that alternative power supply line shall be used as the power supply line to supply power to the non-outage area.

[0092] It should be noted that power restoration to non-outage areas can be achieved by closing the tie switch in the non-outage area. The faulty local agent controller compares the power demand (PD) of the non-outage area with the available capacity (Poc) of the subnet connected to the tie switch capable of restoring power supply within the subnet. If Poc > PD and the power line length is the shortest, the local agent controller of that subnet sends a tie-closing control command to the tie switch that meets the above conditions. Upon receiving the tie-closing control command, the tie switch controls the closing operation to restore power to the non-outage area. In this embodiment, as... Figure 4 As shown, the fault self-healing control method for distributed power generation connected to the distribution network determines that the non-outage area can have its power restored via tie switch 11 or tie switch 15. The local agent controller FBS1 of subnet 1 compares the power demand PD of the non-outage area with the available capacity Poc of subnets 4 and 3 connected to tie switches 11 and 15, respectively. Assuming that Poc > PD for both subnets 3 and 4, the power supply lines from subnets 3 and 4 to the non-outage area are considered as candidate power supply lines. After screening, it is known that the line length from subnet 3 to the non-outage area of ​​subnet 1 is the shortest compared to that from subnet 4 to the non-outage area of ​​subnet 1. Therefore, the power supply line from subnet 3 to the non-outage area is selected as the power supply line to supply power to the non-outage area. The tie switch 15 between subnets 3 and 1 is then closed to restore power to the non-outage area.

[0093] like Figure 2 and Figure 3 As shown, in one embodiment of this application, the communication network architecture is divided into power supply subnetworks and power supply areas using a recursive function based on the number of all distribution terminals, resulting in each subnetwork of the distribution network and the area corresponding to each subnetwork, including:

[0094] Construct a directed tree of the power distribution network based on the communication network architecture and the numbering of all power distribution terminals;

[0095] Using the first switch of the distribution network or the DG switch operating in islanded mode as the root node, a recursive function is used to perform path search on the directed tree to obtain each subnetwork of the distribution network.

[0096] Using the first switch of each subnet or the DG switch operating in an island as the starting point and the tie switch connected to the subnet as the ending point, the subnet is divided into multiple different subnet regions in a directed tree;

[0097] Each subnet area is divided into power outage areas and non-power outage areas based on whether it is powered, and further divided into power supply areas and isolated areas based on whether it has access to power.

[0098] It should be noted that in the communication network architecture, the distribution terminal corresponding to the first switch or the DG switch operating in islanded mode is used as the root node, the distribution terminals corresponding to the separate switches are used as leaf nodes, and the distribution terminals corresponding to the tie switches are used as leaf nodes, forming a structure as follows: Figure 2 The diagram shows a directed tree for the distribution network. An adjacency list storing the directed tree is created in the distribution terminal (also called the local agent controller) corresponding to each first switch or islanded DG switch, as shown below. Figure 3 As shown, the subnet is then divided into multiple different subnet regions in a directed tree, starting with the first switch or the DG switch operating in an islanded manner for each subnet and ending with the tie switch connected to that subnet. A region is a different power supply path within a subnet, and a subnet contains multiple different subnet regions. In this embodiment, a recursive function is defined to obtain the path from the root node to each leaf node. Each path represents a subnet region of the distribution network. The obtained subnet regions of the distribution network within each subnet are as follows: Figure 3 As shown. The steps to obtain the subnet area include:

[0099] In the recursive function, first check if the current node is a leaf node. If it is, add the current node to the path and output the path.

[0100] If the current node is not a leaf node, then traverse all child nodes of the current node and recursively call each child node; before the recursive call, add the current node to the path;

[0101] After a recursive call, the current node is removed from the path to ensure the correctness of the recursive call.

[0102] Example 2:

[0103] Figure 5This is a schematic diagram of the fault self-healing control device for distributed power source access to the distribution network as described in the embodiments of this application.

[0104] like Figure 5 As shown in the figure, this application provides a fault self-healing control device for distributed power sources connected to the distribution network, including a data acquisition module 10, a configuration numbering module 20, a division module 30, a fault isolation module 40, and a power restoration module 50.

[0105] Data acquisition module 10 is used to acquire the network topology of distributed power sources connected to the distribution network, based on the network topology;

[0106] The configuration numbering module 20 is used to number and configure the corresponding power distribution terminal according to the line location of each power distribution terminal in the communication network architecture, so as to obtain the number and type of the power distribution terminal;

[0107] The partitioning module 30 is used to partition the communication network architecture into power supply networks and power supply areas based on the numbers of all distribution terminals using a recursive function, thereby obtaining each subnetwork of the distribution network and the area corresponding to each subnetwork.

[0108] The fault isolation module 40 is used to send a fault signal through the power distribution terminal when a fault occurs in the power distribution network, determine two switches for fault clearing and isolation based on the number of the power distribution terminal corresponding to the fault signal, and determine the power outage area and non-power outage area in the communication network architecture that divides the subnet and area through the fault isolation switch and obtain the power demand of the non-power outage area.

[0109] The power restoration module 50 is used to search for one or more power supply lines connected to the tie switch of the non-outage area on the communication network architecture divided into subnets and areas. Based on the power demand of one or more power supply lines and the non-outage area, the module uses line screening rules to select the power supply line with the shortest line length. The module then closes the tie switch of the power supply line to restore power to the non-outage area.

[0110] The switches in the distribution network include the main switch, tie switch, sectionalizing switch and DG switch, and the types of distribution terminals include the main switch controller, tie switch controller, sectionalizing switch controller and DG switch controller.

[0111] In this embodiment of the application, the fault self-healing control device for distributed power generation connected to the distribution network includes a capacity calculation module. The capacity calculation module is used to obtain the electrical quantity parameters of each sub-network and calculate the open capacity of the first switch or islanded DG switch in the corresponding sub-network based on the electrical quantity parameters of each sub-network. The electrical quantity parameters include the rated capacity of the switch and the maximum percentage of active power that can be opened.

[0112] In this embodiment, the power restoration module 50 is further configured to: select a power supply line as a candidate power supply line if the open capacity of the power supply line is greater than the power demand of the non-outage area; if multiple candidate power supply lines exist, obtain the second line length between the first switch or the islanded DG switch of each candidate power supply line and the nearest tie switch in the non-outage area; select the candidate power supply line with the shortest line length from all the second line lengths as the power supply line to supply power to the non-outage area; if only one candidate power supply line exists, use that candidate power supply line as the power supply line to supply power to the non-outage area.

[0113] It should be noted that the modules in the device of Embodiment 2 correspond to the steps of the method in Embodiment 1. The content of the fault self-healing control method for distributed power generation connected to the distribution network has been described in Embodiment 1, and the steps of the fault self-healing control method for distributed power generation connected to the distribution network will not be described in detail in this embodiment.

[0114] Example 3:

[0115] This application provides a terminal device, including a processor and a memory;

[0116] Memory is used to store program code and transfer the program code to the processor;

[0117] The processor is used to execute the aforementioned fault self-healing control method for distributed power source access to the distribution network according to the instructions in the program code.

[0118] It should be noted that the processor is used to execute the steps in the above-described embodiment of a fault self-healing control method for distributed power source access to a distribution network according to the instructions in the program code. Alternatively, when the processor executes the computer program, it implements the functions of each module / unit in the above-described system / device embodiments.

[0119] For example, a computer program can be divided into one or more modules / units, one or more of which are stored in memory and executed by a processor to complete this application. One or more modules / units can be a series of computer program instruction segments capable of performing a specific function, which describe the execution process of the computer program in a terminal device.

[0120] Terminal devices can be computing devices such as desktop computers, laptops, handheld computers, and cloud servers. Terminal devices may include, but are not limited to, processors and memory. Those skilled in the art will understand that this does not constitute a limitation on the terminal device, which may include more or fewer components than illustrated, or combinations of certain components, or different components. For example, a terminal device may also include input / output devices, network access devices, buses, etc.

[0121] The processor referred to can be a Central Processing Unit (CPU), or other general-purpose processors, digital signal processors (DSPs), application-specific integrated circuits (ASICs), field-programmable gate arrays (FPGs), or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. A general-purpose processor can be a microprocessor or any conventional processor.

[0122] Memory can be an internal storage unit of a terminal device, such as a hard drive or RAM. Memory can also be an external storage device, such as a plug-in hard drive, Smart Memory Card (SMC), Secure Digital Card (SD), or Flash Memory Card. Furthermore, memory can include both internal and external storage units. Memory is used to store computer programs and other programs and data required by the terminal device. Memory can also be used for temporary storage of data that has been output or will be output.

[0123] Those skilled in the art will clearly understand that, for the sake of convenience and brevity, the specific working processes of the systems, devices, and units described above can be referred to the corresponding processes in the foregoing method embodiments, and will not be repeated here.

[0124] In the several embodiments provided in this application, it should be understood that the disclosed systems, apparatuses, and methods can be implemented in other ways. For example, the apparatus embodiments described above are merely illustrative; for instance, the division of units is only a logical functional division, and in actual implementation, there may be other division methods. For example, multiple units or components may be combined or integrated into another system, or some features may be ignored or not executed. Furthermore, the coupling or direct coupling or communication connection shown or discussed may be an indirect coupling or communication connection between apparatuses or units through some interfaces, and may be electrical, mechanical, or other forms.

[0125] The units described as separate components may or may not be physically separate. The components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple network units. Some or all of the units can be selected to achieve the purpose of this embodiment according to actual needs.

[0126] Furthermore, the functional units in the various embodiments of this application can be integrated into one processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit. The integrated unit can be implemented in hardware or as a software functional unit.

[0127] If the integrated unit is implemented as a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of this application, in essence, or the part that contributes to the prior art, or all or part of the technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute all or part of the steps of the methods described in the various embodiments of this application. The aforementioned storage medium includes various media capable of storing program code, such as USB flash drives, portable hard drives, read-only memory (ROM), random access memory (RDM), magnetic disks, or optical disks.

[0128] The above-described embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this application.

Claims

1. A fault self-healing control method for distributed power generation connected to a distribution network, characterized in that, Includes the following steps: Obtain the network topology of distributed power sources connected to the distribution network, configure corresponding distribution terminals for each switch on the distribution network according to the network topology, and obtain the communication network architecture of the distribution network. Based on the line location of each power distribution terminal on the communication network architecture, the corresponding power distribution terminal is numbered and configured with a type to obtain the power distribution terminal number and type; Based on the numbers of all the power distribution terminals, a recursive function is used to divide the communication network architecture into power supply networks and power supply areas, thereby obtaining each sub-network of the power distribution network and the area corresponding to each sub-network; If a fault occurs in the distribution network and a fault signal is issued through the distribution terminal, two switches for fault clearing and isolation are determined according to the number of the distribution terminal corresponding to the fault signal as fault isolation switches. Through the fault isolation switches, the power outage area and the non-power outage area are determined on the communication network architecture that divides the subnets and areas, and the power demand of the non-power outage area is obtained. On the communication network architecture that divides subnets and regions, search for one or more power supply lines connected to the tie switch of the non-power outage area. Based on one or more of the power supply lines and the power demand of the non-power outage area, use line filtering rules to filter and obtain the power supply line with the shortest line length. The power supply line's interconnection switch is closed to restore power to the non-outage area; Obtain the electrical quantity parameters of each subnet, and calculate the open capacity of the first switch or islanded DG switch in the corresponding subnet based on the electrical quantity parameters of each subnet. The electrical quantity parameters include the rated capacity of the switch and the maximum percentage of active power that can be opened. The switches in the power distribution network include first switches, tie switches, sectionalizing switches and DG switches, and the types of power distribution terminals include first switch controllers, tie switch controllers, sectionalizing switch controllers and DG switch controllers. Based on the power demand of one or more of the aforementioned power supply lines and the power demand of the non-outage area, a line screening rule is used to obtain the power supply lines with the shortest line length, including: If the open capacity of the power supply line is greater than the power demand of the non-outage area, then the power supply line shall be used as an alternative power supply line. If there are multiple alternative power supply lines, obtain the second line length between the first switch or the islanded DG switch of each alternative power supply line and the nearest tie switch in the non-outage area; select the alternative power supply line with the shortest line length from all the second line lengths as the power supply line to supply power to the non-outage area. If there is an alternative power supply line, then the alternative power supply line shall be used as the power supply line to supply power to the non-outage area.

2. The fault self-healing control method for distributed power generation connected to the distribution network according to claim 1, characterized in that, include: If no fault occurs in the distribution network, determine the corresponding agent controller for each subnet based on the first switch controller or the islanded DG switch controller for each subnet; and obtain the first line length for each subnet. The open capacity corresponding to the subnet is transmitted to the agent controller of the subnet connected to the subnet through the agent controller; The first line length corresponding to the subnet is transmitted to the tie switch controller of the subnet through the agent controller; The first line length of the subnet is obtained by summing the line lengths configured for each power distribution terminal of the subnet.

3. The fault self-healing control method for distributed power generation connected to the distribution network according to claim 1, characterized in that, Determining power outage areas and non-power outage areas in the communication network architecture that divides subnets and areas using the fault isolation switch includes: The area where the fault isolation switch is located and the area between the fault isolation switch and the adjacent tie switch are designated as the power outage area. The area where the lines between the fault isolation switch and each connecting switch in the communication network architecture are located is designated as the non-power outage area.

4. The fault self-healing control method for distributed power generation connected to the distribution network according to claim 1, characterized in that, Based on the numbers of all the distribution terminals, a recursive function is used to divide the communication network architecture into power supply subnetworks and power supply areas, resulting in each subnetwork of the distribution network and the area corresponding to each subnetwork, including: Construct a directed tree of the power distribution network based on the communication network architecture and the numbering of all the power distribution terminals; Using the first switch of the distribution network or the DG switch operating in islanded mode as the root node, a recursive function is used to perform path search on the directed tree to obtain each subnetwork of the distribution network. The directed tree divides the subnet into multiple different subnet regions, with the first switch or the DG switch operating in an islanded manner in each subnet as the starting point and the tie switch connected to the subnet as the ending point. Each subnet area is divided into power outage areas and non-power outage areas based on whether it is powered on, and each subnet area is divided into power-connected areas and isolated areas based on whether it has power access.

5. A fault self-healing control device for distributed power generation connected to a distribution network, characterized in that, It includes a data acquisition module, a configuration numbering module, a partitioning module, a fault isolation module, a power restoration module, and a capacity calculation module; The data acquisition module is used to acquire the network topology of the distributed power source connected to the distribution network, and configure corresponding distribution terminals for each switch on the distribution network according to the network topology to obtain the communication network architecture of the distribution network. The configuration numbering module is used to number and configure the corresponding power distribution terminal according to the line location of each power distribution terminal on the communication network architecture, so as to obtain the number and type of the power distribution terminal; The partitioning module is used to partition the communication network architecture into power supply networks and power supply areas based on the numbers of all the power distribution terminals using a recursive function, thereby obtaining each subnetwork of the power distribution network and the area corresponding to each subnetwork. The fault isolation module is used to send a fault signal through the power distribution terminal when a fault occurs in the power distribution network, determine two switches for fault clearing and isolation based on the number of the power distribution terminal corresponding to the fault signal, and determine the power outage area and non-power outage area in the communication network architecture that divides the subnets and areas through the fault isolation switches, and obtain the power demand of the non-power outage area. The power restoration module is used to search for one or more power supply lines connected to the tie switch of the non-outage area on the communication network architecture that divides the subnets and areas, and to filter them according to the power demand of the one or more power supply lines and the non-outage area using line filtering rules to obtain the power supply line with the shortest line length. The power supply line's interconnection switch is closed to restore power to the non-outage area; The capacity calculation module is used to obtain the electrical quantity parameters of each subnet and calculate the open capacity of the first switch or islanded DG switch in the corresponding subnet based on the electrical quantity parameters of each subnet. The electrical quantity parameters include the rated capacity of the switch and the maximum percentage of active power that can be opened. The switches in the power distribution network include first switches, tie switches, sectionalizing switches and DG switches, and the types of power distribution terminals include first switch controllers, tie switch controllers, sectionalizing switch controllers and DG switch controllers. Based on the power demand of one or more of the aforementioned power supply lines and the power demand of the non-outage area, a line screening rule is used to obtain the power supply lines with the shortest line length, including: If the open capacity of the power supply line is greater than the power demand of the non-outage area, then the power supply line shall be used as an alternative power supply line. If there are multiple alternative power supply lines, obtain the second line length between the first switch or the islanded DG switch of each alternative power supply line and the nearest tie switch in the non-outage area; select the alternative power supply line with the shortest line length from all the second line lengths as the power supply line to supply power to the non-outage area. If there is an alternative power supply line, then the alternative power supply line shall be used as the power supply line to supply power to the non-outage area.

6. The fault self-healing control device for distributed power generation connected to the distribution network according to claim 5, characterized in that, The power restoration module is also used to select the power supply line as a backup power supply line if the open capacity of the power supply line is greater than the power demand of the non-outage area. If there are multiple alternative power supply lines, obtain the second line length between the first switch or the islanded DG switch of each alternative power supply line and the nearest tie switch in the non-outage area. Select the candidate power supply line with the shortest line length from all the second line lengths as the power supply line to supply power to the non-power outage area; If there is an alternative power supply line, then the alternative power supply line shall be used as the power supply line to supply power to the non-outage area.

7. A terminal device, characterized in that, Including the processor and memory; The memory is used to store program code and transmit the program code to the processor; The processor is configured to execute the fault self-healing control method for distributed power source access to the distribution network as described in any one of claims 1-4, according to the instructions in the program code.

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