Fault positioning method of active power distribution network, computer program product and electronic equipment

Abstract

The invention provides a fault positioning method for an active power distribution network, a computer program product and electronic equipment, and the method comprises the steps: building a switching function of the power distribution network at least according to a network topology structure, and enabling the switching function to be used for converting the state information of a section into the state information of a node; according to the switching function, obtaining telemetering information and telesignalling information corresponding to the node; determining whether the remote signaling information is distorted in the FTU reporting process at least according to the telemetering information; under the condition that the remote signaling information is distorted, correcting the remote signaling information according to the telemetering information to obtain target remote signaling information; establishing a fitness function of the power distribution network at least according to the switching function, the telemetering information and the target telecommand information; and determining a fault section of the power distribution network according to the fitness function by using an improved immune algorithm. According to the method and the device, the problem of inaccurate fault positioning caused by distortion or missing of the FTU in the power distribution network during information uploading in the prior art is solved.

Description

Technical Field

[0001] The present application relates to the technical field of distribution network fault location, and in particular to a fault location method, a computer program product and an electronic device for an active distribution network. Background Art

[0002] As the intermediate link between the power grid and users, the distribution network plays a key role in ensuring the reliability of power supply. However, due to its characteristics of multiple voltage levels, complex network topology, diverse equipment types, numerous line branches (most of which are radial), and relatively poor safety environment, it is difficult to inspect line fault points, which can easily increase the system power supply recovery time and affect the power supply reliability.

[0003] In recent years, more and more distributed power sources have been connected to the power system. The large-scale grid connection of new energy has changed the power supply mode of the traditional distribution network, and the grid structure has also changed significantly, making the distribution network flow bidirectional and changeable, the distribution network topology more complex, and the fault mechanism complex and weak characteristics, which greatly reduces the applicability and accuracy of traditional fault location methods and greatly increases the difficulty of fault location. Therefore, how to ensure the fault diagnosis and fault location accuracy of the distribution network under the premise of complex distribution network topology, flexible operation mode, bidirectional and changeable flow and uncertain output is a problem that needs to be solved urgently.

[0004] In addition, due to the harsh working environment of the FTU (Feeder Terminal Unit) and the communication interference during the transmission of fault information, the uploaded information may be distorted or missing, resulting in inaccurate fault location. Summary of the invention

[0005] The main purpose of the present application is to provide a fault location method, computer program product and electronic device for an active distribution network, so as to at least solve the problem in the prior art that the FTU in the distribution network is distorted or missing when uploading information, resulting in inaccurate fault location.

[0006] In order to achieve the above-mentioned purpose, according to one aspect of the present application, a fault location method for an active distribution network is provided, wherein the network topology structure of the distribution network includes multiple nodes and multiple sections, and the section is a line representing a line between two adjacent nodes. The method includes: at least according to the network topology structure, establishing a switching function of the distribution network, and the switching function is used to convert the status information of the section into the status information of the node; according to the switching function, obtaining the telemetry information and telesignaling information corresponding to the node; at least according to the telemetry information, determining whether the telesignaling information is distorted during the reporting process of the FTU; in the case that the telesignaling information is distorted, correcting the telesignaling information according to the telemetry information to obtain the target telesignaling information; at least according to the switching function, the telemetry information and the target telesignaling information, establishing the fitness function of the distribution network; and using an improved immune algorithm to determine the section of the distribution network where the fault occurs according to the fitness function.

[0007] Optionally, a switching function of the distribution network is established at least according to the network topology structure, including: encoding the state of the node according to a first preset coding rule to obtain a node state code, and encoding the state of the section according to a second preset coding rule to obtain a section state code; establishing the switching function according to the node state code, the section state code and the network topology structure.

[0008] Optionally, the distribution network includes a system power supply, a segmented switch and a distributed power supply, and at least according to the network topology of the distribution network, a switch function of the distribution network is established, including: using the first formula Second formula And the third formula Determine the switching function, where represents the expected value of the state information of the j-th segment switch, represents the expected value of the state information of the upstream part with the i-th segment switch as the demarcation point, represents the expected value of the state information of the downstream part with the i-th segment switch as the demarcation point, the upstream part is the part containing the system power supply with the i-th segment switch as the demarcation point, the downstream part is the part without the system power supply with the i-th segment switch as the demarcation point, M1 represents the number of upstream power supplies in the upstream part, the upstream power supply includes the system power supply and the distributed power supply, N1 represents the number of downstream power supplies in the downstream part, the downstream power supply includes the distributed power supply, M2 represents the number of the sections in the upstream part, and N2 represents the number of the sections in the downstream part, Indicates the i-th segment switch to the upstream power supply Su The expected value of the status information of the segment on the path between Represents the i-th segment switch to the downstream power supply S d The expected value of the status information of the segment on the path between j，d represents the expected value of the status information of the entire segment of the downstream part, x j，u represents the expected value of the status information of the entire segment of the upstream part, K u represents the switching factor of the distributed power source in the upstream part, K d represents the switching factor of the distributed power source in the downstream part. When the distributed power source is connected to the upstream part, K u The value is 1. When no distributed power source is connected to the upstream part, K u The value is 0. When the distributed power source is connected to the downstream part, K d The value is 1. When no distributed power source is connected to the downstream part, K d The value is 0, and Π is a logical "or" operation.

[0009] Optionally, using an improved immune algorithm and according to the fitness function, determining the section of the distribution network where the fault occurs includes: using the improved immune algorithm to solve the fitness function to obtain the section of the distribution network where the fault occurs.

[0010] Optionally, encoding the state of the node according to the first preset encoding rule to obtain the node state code includes: using the fourth formula Determine the node state code, where I j =1 indicates that the current flowing through the i-th node has a fault and the current direction is the positive direction of the power flow, I j = 0 means that the current flowing through the jth node has no fault, I j =-1 indicates that the current flowing through the jth node fails, and the current direction is the negative direction of the current flow, and the positive direction of the current flow is the direction from the system power supply to the distributed power supply or the segment switch. According to the second preset coding rule, the state of the segment is encoded to obtain the segment state code, including: using the fifth formula Determine the segment state code, where x j =1 indicates that the i-th section has a fault, x j =0 indicates that no failure occurs in the i-th section.

[0011] Optionally, at least based on the telemetry information, determining whether the telesignaling information is distorted during FTU reporting includes: establishing a distortion information model based on the node status coding, the distortion information model characterizing information distortion that may occur in the node status coding during FTU reporting; determining whether the telesignaling information is distorted during FTU reporting based on the distortion information model and the telemetry information.

[0012] Optionally, a distortion information model is established according to the node state coding, including: establishing a false alarm model and a false alarm model according to the node state coding, the false alarm model and the false alarm model constitute the distortion information model, wherein the false alarm model includes a first distortion type and a second distortion type, and the false alarm model includes a third distortion type, a fourth distortion type, a fifth distortion type and a sixth distortion type, the first distortion type indicates that the node state coding is distorted from 1 to 0, the second distortion type indicates that the node state coding is distorted from -1 to 0, the third distortion type indicates that the node state coding is distorted from 1 to -1, the fourth distortion type indicates that the node state coding is distorted from -1 to 1, the fifth distortion type indicates that the node state coding is distorted from 0 to 1, and the sixth distortion type indicates that the node state coding is distorted from 0 to -1.

[0013] Optionally, establishing the fitness function of the distribution network at least according to the switch function, the telemetry information and the target telemetering information includes: establishing the fitness function according to the omission model, the false alarm model, the switch function, the telemetry information and the target telemetering information, and establishing the fitness function according to the omission model, the false alarm model, the switch function, the telemetry information and the target telemetering information, including: using the sixth formula

[0014] Determine the fitness function, where F(x) represents the fitness function, I i represents the telemetry information corresponding to the j-th section switch, represents the target telesignal information corresponding to the ith section switch, x j represents the state information corresponding to the i-th section, M represents the total number of the segment switches, ε1 represents a preset first weight coefficient, ε2 represents a preset second weight coefficient, ε3 represents a preset third weight coefficient, ε4 represents a preset fourth weight coefficient, represents a missing variable, Represents a false positive variable. When the distortion corresponding to the false negative model occurs The value is 1, when the distortion corresponding to the underreporting model does not occur The value is 0. When the distortion corresponding to the false alarm model occurs The value is 1, when the distortion corresponding to the false alarm model does not occur The value is 0.

[0015] According to another aspect of the present application, a computer program product is provided, comprising computer instructions, wherein when the computer instructions are executed by a processor, any one of the fault location methods for an active power distribution network is implemented.

[0016] According to another aspect of the present application, an electronic device is provided, comprising: one or more processors, a memory, and one or more programs, wherein the one or more programs are stored in the memory and are configured to be executed by the one or more processors, and the one or more programs include a method for executing any one of the fault location methods for the active distribution network.

[0017] By applying the technical solution of the present application, firstly, according to the network topology of the distribution network, a switch function for converting the status information of the section into the status information of the node is established, then according to the switch function, the telemetry information and telesignaling information corresponding to the node are obtained, and at least according to the telemetry information, it is determined whether the telesignaling information is distorted during the reporting process of the FTU. In the case that the telesignaling information is distorted, the telesignaling information is corrected according to the telemetry information to obtain the target telesignaling information, and then the fitness function of the distribution network is established at least according to the switch function, the telemetry information and the target telesignaling information, and finally, the improved immune algorithm is used to determine the section of the distribution network where the fault occurs according to the fitness function. Compared with the problem in the prior art that the FTU in the distribution network is distorted or missing when uploading information, resulting in inaccurate fault location, the present application establishes a switch function to convert the status information of the section into the status information of the node, and when the telesignaling information of the node is distorted during the reporting process, the telesignaling information is corrected according to the telemetry information of the node to obtain the target telesignaling information, and then the fitness function of the distribution network is established. The improved immune algorithm is used to determine the fault section of the distribution network according to the fitness function, thereby ensuring that the fault section can be accurately located when the distribution network is distorted. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The drawings constituting part of the present application are used to provide a further understanding of the present application. The exemplary embodiments and descriptions of the present application are used to explain the present application and do not constitute an improper limitation on the present application. In the drawings:

[0019] Figure 1 A hardware structure block diagram of a mobile terminal for executing a fault location method for an active power distribution network provided in an embodiment of the present application is shown;

[0020] Figure 2A schematic flow chart of a fault location method for an active power distribution network provided according to an embodiment of the present application is shown;

[0021] Figure 3 A schematic diagram of a feeder power flow of an active power distribution network provided according to an embodiment of the present application is shown;

[0022] Figure 4 A schematic diagram of information distortion types of a node provided according to an embodiment of the present application is shown;

[0023] Figure 5 A schematic diagram of a network topology structure of an active power distribution network provided according to an embodiment of the present application is shown;

[0024] Figure 6 A simplified network topology diagram of an active power distribution network provided according to an embodiment of the present application is shown.

[0025] The above drawings include the following reference numerals:

[0026] 102, processor; 104, memory; 106, transmission device; 108, input and output devices. DETAILED DESCRIPTION

[0027] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. The present application will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0028] In order to enable those skilled in the art to better understand the solution of the present application, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present application.

[0029] It should be noted that the terms "first", "second", etc. in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequential order. It should be understood that the data used in this way can be interchanged where appropriate, so that the embodiments of the present application described here. In addition, the terms "including" and "having" and any of their variations are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device comprising a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0030] As introduced in the background technology, in the prior art, the FTU in the distribution network is distorted or missing when uploading information, resulting in inaccurate fault location. To solve the above problems, the embodiments of the present application provide a fault location method, computer program product and electronic device for an active distribution network.

[0031] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the accompanying drawings in the embodiments of the present invention.

[0032] The method embodiments provided in the embodiments of the present application can be executed in a mobile terminal, a computer terminal or a similar computing device. Taking running on a mobile terminal as an example, Figure 1 FIG. 1 is a hardware structure block diagram of a mobile terminal of a method for locating a fault in an active power distribution network according to an embodiment of the present invention. Figure 1 As shown, the mobile terminal may include one or more ( Figure 1 Only one is shown in the figure) a processor 102 (the processor 102 may include but is not limited to a processing device such as a microprocessor MCU or a programmable logic device FPGA) and a memory 104 for storing data, wherein the mobile terminal may also include a transmission device 106 and an input / output device 108 for communication functions. It can be understood by those skilled in the art that Figure 1 The structure shown is only for illustration and does not limit the structure of the mobile terminal. Figure 1 More or fewer components as shown, or with Figure 1 Different configurations are shown.

[0033] The memory 104 can be used to store computer programs, for example, software programs and modules of application software, such as the computer program corresponding to the fault location method of the active power distribution network in the embodiment of the present invention. The processor 102 executes various functional applications and data processing by running the computer program stored in the memory 104, that is, the above method is implemented. The memory 104 may include a high-speed random access memory, and may also include a non-volatile memory, such as one or more magnetic storage devices, flash memory, or other non-volatile solid-state memory. In some examples, the memory 104 may further include a memory remotely arranged relative to the processor 102, and these remote memories can be connected to the mobile terminal via a network. Examples of the above-mentioned network include but are not limited to the Internet, an intranet, a local area network, a mobile communication network, and a combination thereof. The transmission device 106 is used to receive or send data via a network. The specific example of the above-mentioned network may include a wireless network provided by a communication provider of the mobile terminal. In one example, the transmission device 106 includes a network adapter (Network Interface Controller, referred to as NIC), which can be connected to other network devices through a base station so as to communicate with the Internet. In one example, the transmission device 106 may be a radio frequency (RF) module, which is used to communicate with the Internet wirelessly.

[0034] In this embodiment, a fault location method for an active power distribution network running on a mobile terminal, a computer terminal or a similar computing device is provided. It should be noted that the steps shown in the flowchart of the accompanying drawings can be executed in a computer system such as a set of computer executable instructions, and although a logical order is shown in the flowchart, in some cases, the steps shown or described can be executed in an order different from that shown here.

[0035] Figure 2 The network topology of the distribution network includes a plurality of nodes and a plurality of sections, wherein the sections represent the lines between two adjacent nodes, such as Figure 2 As shown, the method comprises the following steps:

[0036] Step S201, establishing a switch function of the distribution network at least according to the network topology, wherein the switch function is used to convert the state information of the section into the state information of the node;

[0037] Step S202, according to the switch function, obtaining telemetry information and telesignaling information corresponding to the node;

[0038] Step S203, determining whether the telesignaling information is distorted during the reporting process of the FTU at least based on the telemetry information;

[0039] Step S204, in the case where the telesignaling information is distorted, the telesignaling information is corrected according to the telemetry information to obtain target telesignaling information;

[0040] Step S205, establishing a fitness function of the distribution network at least according to the switch function, the telemetry information and the target telesignaling information;

[0041] Step S206: using an improved immune algorithm and based on the fitness function, determining the section where the fault occurs in the distribution network.

[0042] Through the above embodiments, firstly, according to the network topology of the distribution network, a switch function for converting the status information of the section into the status information of the node is established, then according to the switch function, the telemetry information and telesignaling information corresponding to the node are obtained, and at least according to the telemetry information, it is determined whether the telesignaling information is distorted in the process of FTU reporting. In the case that the telesignaling information is distorted, the telesignaling information is corrected according to the telemetry information to obtain the target telesignaling information, and then the fitness function of the distribution network is established at least according to the switch function, the telemetry information and the target telesignaling information. Finally, the improved immune algorithm is used to determine the section where the distribution network fails according to the fitness function. Compared with the problem in the prior art that the FTU in the distribution network is distorted or missing when uploading information, resulting in inaccurate fault location, the present application establishes a switch function to convert the status information of the section into the status information of the node, and when the telesignaling information of the node is distorted during the reporting process, the telesignaling information is corrected according to the telemetry information of the node to obtain the target telesignaling information, and then the fitness function of the distribution network is established. The improved immune algorithm is used to determine the fault section of the distribution network according to the fitness function, thereby ensuring that the fault section can be accurately located when the distribution network is distorted.

[0043] Specifically, the status information of the above-mentioned node includes the above-mentioned telemetry information and the above-mentioned telesignaling information of the above-mentioned node.

[0044] In an optional solution, at least according to the network topology structure, the switch function of the distribution network is established, including: encoding the state of the node according to the first preset coding rule to obtain the node state code, and encoding the state of the section according to the second preset coding rule to obtain the section state code; establishing the switch function according to the node state code, the section state code and the network topology structure. In this embodiment, the states of the node and the section are encoded according to the first preset coding rule and the second preset coding rule, respectively, to obtain the node state code and the section state code, and the switch function is established according to the node state code, the section state code and the network topology structure, so that the obtained switch function is ensured to be relatively accurate, thereby ensuring that the subsequent positioning of the faulty section is relatively accurate.

[0045] In other embodiments, the distribution network includes a system power supply, a segmented switch, and a distributed power supply. At least according to the network topology of the distribution network, a switch function of the distribution network is established, including: using the first formula Second formula And the third formula Determine the above switching function, where, represents the expected value of the state information of the j-th above-mentioned segment switch, represents the expected value of the state information of the upstream part with the jth above-mentioned sectionalizing switch as the demarcation point, represents the expected value of the state information of the downstream part with the jth above-mentioned segment switch as the demarcation point, the above-mentioned upstream part is the part containing the above-mentioned system power supply with the i-th above-mentioned segment switch as the demarcation point, the above-mentioned downstream part is the part without the above-mentioned system power supply with the i-th above-mentioned segment switch as the demarcation point, M1 represents the number of upstream power supplies of the above-mentioned upstream part, and the above-mentioned upstream power supply includes the above-mentioned system power supply and the above-mentioned distributed power supply, N1 represents the number of downstream power supplies of the above-mentioned downstream part, and the above-mentioned downstream power supply includes the above-mentioned distributed power supply, M2 represents the number of the above-mentioned sections of the above-mentioned upstream part, and N2 represents the number of the above-mentioned sections of the above-mentioned downstream part, Indicates the i-th segment switch to the upstream power supply S u The expected value of the status information of the above segments on the path between Indicates the jth segment switch to the downstream power supply S d The expected value of the state information of the above segments on the path between j，d represents the expected value of the status information of the above-mentioned section of the above-mentioned downstream part, x j，u represents the expected value of the status information of all the above segments of the above upstream part, K u represents the switching factor of the distributed power source in the upstream part, K dIndicates the switching factor of the distributed power source in the downstream part. When the distributed power source is connected to the upstream part, K u The value is 1. When there is no distributed power source connected to the upstream part, K u The value is 0. When the above distributed power source is connected to the above downstream part, K d The value is 1. When there is no distributed power source connected to the downstream part, K d The value is 0, and Π is a logical "or" operation. Compared with the problems in the prior art in which the distributed power source is connected to the distribution network, which makes the distribution network topology complex, the operation mode flexible, the flow bidirectional and changeable, and the output uncertain, resulting in inaccurate fault location, in this embodiment, the specific first formula, the second formula and the third formula are used to determine the switch function, and the influence of the distributed power source on the distribution network is taken into account, which further ensures that the obtained switch function is more accurate, thereby further ensuring that the subsequent fault location is more accurate.

[0046] Specifically, the current level of a distribution network fault refers to the level of change in current and power in the system when an electrical fault such as single-phase grounding occurs in the distribution network. Generally, the current in a traditional distribution network will increase by 10 to 15 times when a fault such as a short circuit occurs. When a distribution network is connected to a distributed generation, the current level of a distribution network fault will change. The degree of change depends on factors such as the location of the DG (Distributed Generation) access, the current generation capacity of the DG at that time, the electrical distance between the DG and the distribution network fault point, and the specific type of the DG. For example, when the DG is installed between the substation and the fault point, the fault current detected by the master station will become smaller. When the DG capacity installed in the distribution network is small (5kW to 5MW), its impact on the short-circuit current is small; when the DG capacity installed in the distribution network is large, such as multiple small units or several large units (50 to 200 MW), they may change the fault level and cause the circuit breaker to fail.

[0047] Specifically, when a fault occurs in the distribution network, fault location needs to rely on SCADA (Supervisory Control and Data Acquisition) to receive the fault information reported by the FTU, and it is crucial to establish the conversion between the fault current information and the section status. This conversion needs to be implemented with a switch function. The section status code is converted into the node status code through the switch function, that is, the information actually detected by each terminal. When a fault occurs in a certain section, the information detected and uploaded by the FTU is the node status code, that is, the fault current information flowing through each node. When using an intelligent algorithm to handle faults, a population is first generated, and each individual is composed of a section status code, and then the switch function is used to convert the individual information into the corresponding fault current state.

[0048] After DG is incorporated into the distribution network, the power flow direction of the distribution network is no longer single, and the traditional switching function is no longer applicable. Therefore, a new switching function needs to be established to apply to the distribution network containing DG. The switching function of this application takes into account the switching conditions of each DG and divides each segment switch into two parts, the upstream part containing the system power supply and the downstream part without the system power supply.

[0049] In some exemplary embodiments, the improved immune algorithm is used to determine the section where the distribution network fails according to the fitness function, including: using the improved immune algorithm to solve the fitness function to obtain the section where the distribution network fails. In this embodiment, the improved immune algorithm is used to solve the fitness function, which further ensures that the obtained fault section is more accurate.

[0050] Specifically, the improved immune algorithm is used to find the optimal solution of the fitness function, and the output optimal solution sequence is the fault section.

[0051] In some other optional solutions, according to the first preset coding rule, the state of the above node is encoded to obtain the node state code, including: using the fourth formula Determine the above node state encoding, where I j =1 indicates that the current flowing through the jth node has a fault and the current direction is the positive direction of the power flow, I j = 0 means that the current flowing through the jth node is not faulty, I j =-1 indicates that the current flowing through the jth node fails, and the current direction is the negative direction of the current flow, and the positive direction of the current flow is the direction from the system power supply to the distributed power supply or the segment switch. According to the second preset coding rule, the state of the segment is encoded to obtain the segment state code, including: using the fifth formula Determine the above segment state code, where x j =1 indicates that the i-th section mentioned above has a fault, x j = 0 indicates that the i-th section has no fault. In this embodiment, the problem of bidirectional fault current caused by distributed power sources is taken into consideration, and the fourth and fifth formulas are used to ensure that the obtained node state coding and section state coding are relatively accurate, thereby further ensuring that the subsequent switching function is relatively accurate.

[0052] Specifically, the circuit breakers and switches in the distribution network are defined as nodes, and the lines between adjacent nodes are defined as sections. When a short circuit fault occurs in a line section in the distribution network, the feeder terminal unit uploads the detection information to the control center. The 0-1 encoding method is used to indicate the fault status of the feeder section, 0 means that the section is fault-free and operates normally; 1 means that the section has a fault. The information fed back by the FTU is also represented by 0 and 1. When the FTU detects fault current information, it is represented by 1, and when it is not detected, it is represented by 0.

[0053] Specifically, the connection of DG to the distribution network will affect the flow direction of the system. When a short circuit occurs in the distribution network, the current direction provided to the fault point may be bidirectional. At this time, only using 0 and 1 cannot well represent the fault current condition flowing through the node. Therefore, a new encoding rule is introduced (specifying that the positive direction of the flow is from the main power supply side to the DG side and the load side).

[0054] Specifically, Figure 3 For example, the distribution network includes 1 main power source S b and two distributed power sources DG1 and DG2. When the two distributed power sources are not connected to the distribution network system, the main power source S b It is the only power source in the system. When two distributed power sources are connected to the distribution network system, the power flow direction in the distribution network system can be obtained by simulating the line operation status through PSCAD. Figure 1 As shown, Figure 1 Each node in the diagram represents a circuit breaker or switch in the distribution network.

[0055] In some further optional schemes, at least based on the telemetry information, determining whether the telesignaling information is distorted during the reporting process of the FTU includes: establishing a distortion information model based on the node status coding, the distortion information model characterizing the information distortion that will occur in the node status coding during the reporting process of the FTU; determining whether the telesignaling information is distorted during the reporting process of the FTU based on the distortion information model and the telemetry information. In this embodiment, a distortion information model is established based on the node status coding, and based on the distortion information model and the telemetry information, determining whether the telesignaling information is distorted ensures that it can be more accurately determined whether the telesignaling information is distorted, thereby further ensuring that the subsequent positioning of the fault section is more accurate.

[0056] In some other exemplary embodiments, a distortion information model is established according to the above-mentioned node state coding, including: according to the above-mentioned node state coding, a false alarm model and a false alarm model are established, and the above-mentioned false alarm model and the above-mentioned false alarm model constitute the above-mentioned distortion information model, wherein the above-mentioned false alarm model includes a first distortion type and a second distortion type, and the above-mentioned false alarm model includes a third distortion type, a fourth distortion type, a fifth distortion type and a sixth distortion type, the above-mentioned first distortion type indicates that the above-mentioned node state coding is distorted from 1 to 0, the above-mentioned second distortion type indicates that the above-mentioned node state coding is distorted from -1 to 0, the above-mentioned third distortion type indicates that the above-mentioned node state coding is distorted from 1 to -1, the above-mentioned fourth distortion type indicates that the above-mentioned node state coding is distorted from -1 to 1, the above-mentioned fifth distortion type indicates that the above-mentioned node state coding is distorted from 0 to 1, and the above-mentioned sixth distortion type indicates that the above-mentioned node state coding is distorted from 0 to -1. In this embodiment, the distortion information model is divided into a false alarm model and a false alarm model. The false alarm model includes the first distortion type and the second distortion type, and the false alarm model includes the third distortion type, the fourth distortion type, the fifth distortion type and the sixth distortion type, which further ensures that it can be more accurately judged whether the remote signal information is distorted in the subsequent process, and prepares for the subsequent establishment of a fitness function.

[0057] Specifically, due to the harsh working environment of the FTU and the communication interference during the transmission of fault information, the uploaded information may be distorted or missing. In order to accurately understand the distortion of the information, the distortion of different information is classified. Figure 4 As shown in the figure, the information distortion can be divided into 6 categories. When the actual encoding of the FTU uploaded information is 0, it may be distorted into 1 and -1. The corresponding distortion types in the figure are type 5 and type 6 respectively; when the FTU uploaded information is actually encoded as 1, it can be distorted into 0 and -1. The corresponding distortion types in the figure are type 1 and type 3 respectively; when the FTU uploaded information is actually encoded as -1, it may be distorted into 0 and 1. The corresponding distortion types in the figure are type 2 and type 4 respectively.

[0058] Specifically, the distortion information model (missing model and false alarm model) is shown in Table 1:

[0059] Table 1

[0060]

[0061] Specifically, distortion information correction: Considering that the possibility of simultaneous distortion of telemetry information and telesignaling information of the same node is very small, the telemetry information uploaded to the master station or substation can be used to correct the distortion of telesignaling information. The correction process is as follows: When a short circuit fault occurs in the distribution network, first, the master station collects the fault overcurrent information g of each phase reported by the FTU. X , g Y , gZ , where g X =1 indicates that the X phase of a node switch reports the forward fault overcurrent information, g X =0 means that the X phase of a node switch does not report fault overcurrent information, g X =-1 means that the X phase of a node switch reports reverse fault overcurrent information, and the direction from the main power supply to the feeder end or DG is defined as the positive direction of the entire network; then, the FTU uploads the three-phase current information of the node switch to be corrected, using I X Indicates the x-phase current of a node switch. Define the telemetry information g′ of the node x for: Where: I s Indicates the current setting value, g′ x =1 indicates that the phase flows through the positive fault current, g′ x = 0 means that no fault current flows through this phase, g′ x =-1 indicates that the reverse fault current flows through this phase.

[0062] Specifically, the specific steps of distortion information correction are as follows:

[0063] (1) First, the master station collects the three-phase fault overcurrent information g of the node switch to be corrected X , g Y , g Z and three-phase current I X ,I Y ,I z , according to the formula of the node's telemetry information, g′ is obtained x , g′ y , g′ z .

[0064] (2) If at least two phases of a switch have fault current flowing through them, then the switch will have fault current flowing through it, and the direction of the fault current will be further determined: X =g′ x =g′ y =1,g Y =-1, g Z =g′ z =0, the Y-phase fault information of the switch is falsely reported, and the Y-phase fault overcurrent information of the switch is corrected to g Y =1, the switch fault information is g ii =1; if g X =g Y =g′ x =g′ y =1,g Z =g′ z = 0, the switch fault information is not distorted; if g x =g′ x =g′y =-1, g Y =1,g Z =g′ z =0, the Y-phase fault information of the switch is falsely reported, and the Y-phase fault overcurrent information of the switch is corrected to g Y =-1, then the switch fault information is g ii =-1; if g X =g Y =g′ x =g′ y =-1, g Z =g′ z =0, the switch fault information is not distorted; if the three-phase fault overcurrent information of a switch is 0 (g X =g Y =g Z =g′ x =g′ y =g′ z =0), then the switch fault overcurrent information is not distorted; if the three-phase fault overcurrent information of a switch is 1 (g X =g Y =g Z =g′ x =g′ y =g′ z =1), then the switch fault overcurrent information is not distorted; if the three-phase fault overcurrent information of a switch is -1(g X =g Y =g Z =g′ x =g′ y =g′ z =-1), the switch fault overcurrent information is not distorted.

[0065] (3) If only one phase of the three-phase fault overcurrent information of a switch has overcurrent, the fault overcurrent information of the switch is distorted and needs to be further corrected: X =g′ x =g′ y =1,g Y =g Z =g′ z =0, the Y-phase fault overcurrent information of the switch is missed, and the Y-phase fault overcurrent information of the switch is corrected to g Y =1, the switch fault information is g ii =1; if g X =g′ x =g′ y =-1, g Y =g Z =g′ z=0, the Y-phase fault overcurrent information of the switch is missed, and the Y-phase fault overcurrent information of the switch is corrected to g Y =-1, then the switch fault information is g ii =-1; if g X =g Z =g′ x =g′ y =g′ z =0,g Y =1, the Y-phase fault overcurrent information of the switch is falsely reported, and the Y-phase fault overcurrent information of the switch is corrected to g Y =0, the switch fault information is g ii =0; if g X =g Z =g′ x =g′ y =g′ z =0,g Y = -1, then the Y-phase fault overcurrent information of the switch is falsely reported, and the Y-phase fault overcurrent information of the switch is corrected to g Y =0, the switch fault information is g ii =0.

[0066] (4) After the fault information of the corresponding node switch is corrected, the corrected fault information sequence is obtained. If the node information is not distorted, the verification is exited and the positioning result is output.

[0067] In other embodiments, at least according to the switch function, the telemetry information and the target telemetering information, the fitness function of the distribution network is established, including: according to the omission model, the false alarm model, the switch function, the telemetry information and the target telemetering information, the fitness function is established; according to the omission model, the false alarm model, the switch function, the telemetry information and the target telemetering information, the fitness function is established, including: using the sixth formula Determine the above fitness function, where F(x) represents the above fitness function, I j represents the telemetry information corresponding to the j-th sectionalizing switch, I″ j (x) represents the target telesignal information corresponding to the j-th sectional switch, x j represents the state information corresponding to the i-th segment, M represents the total number of the segment switches, ε1 represents the preset first weight coefficient, ε2 represents the preset second weight coefficient, ε3 represents the preset third weight coefficient, ε4 represents the preset fourth weight coefficient, represents a missing variable, Represents a false positive variable. When the distortion corresponding to the above underreporting model occurs The value is 1, when the distortion corresponding to the above underreporting model does not occur The value is 0. When the distortion corresponding to the above false alarm model occurs The value is 1, when the distortion corresponding to the above false alarm model does not occur The value is 0. In this embodiment, the fitness function is determined by using the sixth formula, which takes into account the situations of missed alarms and false alarms, and further ensures that the obtained fitness function is more accurate, thereby further ensuring that the positioning of the fault section is more accurate.

[0068] In actual application, those skilled in the art can set the first weight coefficient, the second weight coefficient, the third weight coefficient and the fourth weight coefficient according to empirical values. In this embodiment, the first weight coefficient is 0.5, the second weight coefficient is 0.5, the third weight coefficient is 1, and the fourth weight coefficient is 1.

[0069] Specifically, the accuracy of fault location is determined by the fitness function. Fault current information is distorted due to irresistible factors, which reduces the fault tolerance of fault section location. In order to improve the fault tolerance performance of the fault section, the underreporting and false alarm of FTU information are taken into account as variables in the fitness function. Indicates that false positives express.

[0070] Specifically, Where: sign is the sign function, “-” represents the logical negation operation, I j The actual value of the fault status information detected by the FTU on the jth section switch, I″ j (x) is the expected value of the status information of the jth section switch after taking into account the missed and false alarms of the FTU.

[0071] Specifically, whether there is DG in each branch of the distribution network can be divided into active and passive. The fault current generated by the power supply will affect the active branch but not the passive branch. If the passive branch does not fail, it will be eliminated during positioning, thereby reducing the dimensionality. Figure 5 The figure is a schematic diagram of a topological model of a power distribution network. By analyzing each branch section, it is not difficult to see that when a branch section fails, the impact on other sections is fixed, but the impact on nodes within the section is not fixed. Figure 5 The schematic diagram of the network topology model after simplifying the topology structure shown in Figure 6 shown. Figure 5 The nodes are numbered according to Figure 5 The number of nodes in the Figure 6 The nodes are numbered according to Figure 6 The number of nodes in the Figure 5 The serial number of the midpoint mark is Figure 6 The serial numbers marked on the midpoints do not correspond.

[0072] Specifically, the distribution network is divided into active branches and passive branches, and the passive branches are filtered according to the actual node status found. If it is determined that the passive branch has no fault current, it is considered that the passive branch has no fault point, and the passive branch is removed from the network model; after removing the passive branch, the area where the fault point is located is obtained by simplifying the network equivalent nodes and then improving the immune algorithm.

[0073] In order to enable those skilled in the art to more clearly understand the technical solution of the present application, the implementation process of the fault location method for the active power distribution network of the present application will be described in detail below in combination with specific embodiments.

[0074] This embodiment relates to a specific active power distribution network fault location method, comprising the following steps:

[0075] Step S1: encoding the state of a node according to a first preset encoding rule to obtain a node state code, and encoding the state of a segment according to a second preset encoding rule to obtain a segment state code;

[0076] Step S2: establishing a switch function according to the node state code, the segment state code and the network topology;

[0077] Step S3: According to the switch function, obtain the telemetry information and telesignaling information corresponding to the node;

[0078] Step S4: establishing a distortion information model according to the node state coding, wherein the distortion information model represents the information distortion that will occur when the node state coding is reported by the FTU;

[0079] Step S5: Determine whether the telemetering information is distorted during the reporting process of the FTU according to the distortion information model and the telemetering information;

[0080] Step S6: In the case where the remote signaling information is distorted, the remote signaling information is corrected according to the telemetry information to obtain the target remote signaling information;

[0081] Step S7: Establishing a fitness function according to the distortion information model, the switch function, the telemetry information and the target telemetering information;

[0082] Step S8: using the improved immune algorithm to solve the fitness function and obtain the section where the fault occurs in the distribution network.

[0083] It should be noted that the steps shown in the flowcharts of the accompanying drawings can be executed in a computer system such as a set of computer executable instructions, and that, although a logical order is shown in the flowcharts, in some cases, the steps shown or described can be executed in an order different from that shown here.

[0084] The present application also provides a computer program product, including computer instructions, which, when executed by a processor, implement at least the following method steps: step S201, establishing a switch function of the distribution network at least based on the network topology, the switch function being used to convert the status information of the section into the status information of the node; step S202, acquiring the telemetry information and telesignaling information corresponding to the node according to the switch function; step S203, determining whether the telesignaling information is distorted during the reporting process of the FTU at least based on the telemetry information; step S204, in the case where the telesignaling information is distorted, correcting the telesignaling information according to the telemetry information to obtain the target telesignaling information; step S205, establishing a fitness function of the distribution network at least based on the switch function, the telemetry information and the target telesignaling information; step S206, determining the section of the distribution network where a fault occurs according to the fitness function using an improved immune algorithm.

[0085] Optionally, at least based on the above-mentioned network topology structure, the switching function of the above-mentioned distribution network is established, including: encoding the state of the above-mentioned node according to a first preset coding rule to obtain a node state code, and encoding the state of the above-mentioned section according to a second preset coding rule to obtain a section state code; establishing the above-mentioned switching function based on the above-mentioned node state code, the above-mentioned section state code and the above-mentioned network topology structure.

[0086] Optionally, the distribution network includes a system power supply, a segmented switch and a distributed power supply, and at least according to the network topology of the distribution network, a switch function of the distribution network is established, including: using the first formula Second formula And the third formula Determine the above switching function, where, represents the expected value of the state information of the j-th above-mentioned segment switch, represents the expected value of the state information of the upstream part with the jth above-mentioned sectionalizing switch as the demarcation point, represents the expected value of the state information of the downstream part with the jth above-mentioned segment switch as the demarcation point, the above-mentioned upstream part is the part containing the above-mentioned system power supply with the i-th above-mentioned segment switch as the demarcation point, the above-mentioned downstream part is the part without the above-mentioned system power supply with the i-th above-mentioned segment switch as the demarcation point, M1 represents the number of upstream power supplies of the above-mentioned upstream part, and the above-mentioned upstream power supply includes the above-mentioned system power supply and the above-mentioned distributed power supply, N1 represents the number of downstream power supplies of the above-mentioned downstream part, and the above-mentioned downstream power supply includes the above-mentioned distributed power supply, M2 represents the number of the above-mentioned sections of the above-mentioned upstream part, and N2 represents the number of the above-mentioned sections of the above-mentioned downstream part, Indicates the jth segment switch to the upstream power supply S u The expected value of the status information of the above segments on the path between Indicates the i-th segment switch to the downstream power supply S d The expected value of the state information of the above segments on the path between j，d represents the expected value of the status information of the above-mentioned section of the above-mentioned downstream part, x j，u represents the expected value of the status information of all the above segments of the above upstream part, K u represents the switching factor of the distributed power source in the upstream part, K d Indicates the switching factor of the distributed power source in the downstream part. When the distributed power source is connected to the upstream part, K u The value is 1. When there is no distributed power source connected to the upstream part, the value of Ku is 0. When the distributed power source is connected to the downstream part, K d The value is 1. When there is no distributed power source connected to the downstream part, K d The value is 0, and Π is a logical "or" operation.

[0087] Optionally, using an improved immune algorithm, according to the fitness function, determining the section where the fault occurs in the distribution network, including: using the improved immune algorithm to solve the fitness function to obtain the section where the fault occurs in the distribution network.

[0088] Optionally, according to the first preset coding rule, encoding the state of the above node to obtain the node state code includes: using the fourth formula Determine the above node state encoding, where I j =1 indicates that the current flowing through the jth node has a fault and the current direction is the positive direction of the power flow, I j = 0 means that the current flowing through the jth node is not faulty, I j =-1 indicates that the current flowing through the jth node fails, and the current direction is the negative direction of the current flow, and the positive direction of the current flow is the direction from the system power supply to the distributed power supply or the segment switch. According to the second preset coding rule, the state of the segment is encoded to obtain the segment state code, including: using the fifth formula Determine the above segment state code, where x j =1 indicates that the i-th section mentioned above has a fault, x j =0 indicates that no fault occurs in the jth section mentioned above.

[0089] Optionally, at least based on the above-mentioned telemetry information, determine whether the above-mentioned telesignaling information is distorted during the process of FTU reporting, including: establishing a distortion information model based on the above-mentioned node state coding, the above-mentioned distortion information model characterizing the information distortion that may occur in the process of FTU reporting of the above-mentioned node state coding; based on the above-mentioned distortion information model and the above-mentioned telemetry information, determine whether the above-mentioned telesignaling information is distorted during the process of FTU reporting.

[0090] Optionally, a distortion information model is established according to the above-mentioned node state coding, including: according to the above-mentioned node state coding, an underreporting model and a false alarm model are established, and the above-mentioned underreporting model and the above-mentioned false alarm model constitute the above-mentioned distortion information model, wherein the above-mentioned underreporting model includes a first distortion type and a second distortion type, and the above-mentioned false alarm model includes a third distortion type, a fourth distortion type, a fifth distortion type and a sixth distortion type, the above-mentioned first distortion type indicates that the above-mentioned node state coding is distorted from 1 to 0, the above-mentioned second distortion type indicates that the above-mentioned node state coding is distorted from -1 to 0, the above-mentioned third distortion type indicates that the above-mentioned node state coding is distorted from 1 to -1, the above-mentioned fourth distortion type indicates that the above-mentioned node state coding is distorted from -1 to 1, the above-mentioned fifth distortion type indicates that the above-mentioned node state coding is distorted from 0 to 1, and the above-mentioned sixth distortion type indicates that the above-mentioned node state coding is distorted from 0 to -1.

[0091] Optionally, at least according to the switch function, the telemetry information and the target telemetering information, the fitness function of the distribution network is established, including: according to the omission model, the false alarm model, the switch function, the telemetry information and the target telemetering information, the fitness function is established; according to the omission model, the false alarm model, the switch function, the telemetry information and the target telemetering information, the fitness function is established, including: using the sixth formula Determine the above fitness function, where F(x) represents the above fitness function, I j represents the telemetry information corresponding to the j-th sectionalizing switch, I″ j (x) represents the target telesignal information corresponding to the j-th sectional switch, x j represents the state information corresponding to the jth segment, M represents the total number of the segment switches, ε1 represents the preset first weight coefficient, ε2 represents the preset second weight coefficient, ε3 represents the preset third weight coefficient, ε4 represents the preset fourth weight coefficient, represents a missing variable, Represents a false positive variable. When the distortion corresponding to the above underreporting model occurs The value is 1, when the distortion corresponding to the above underreporting model does not occur The value is 0. When the distortion corresponding to the above false alarm model occurs The value is 1, when the distortion corresponding to the above false alarm model does not occur The value is 0.

[0092] An embodiment of the present application also provides an electronic device, comprising: one or more processors, a memory, and one or more programs, wherein the one or more programs are stored in the memory and are configured to be executed by the one or more processors, and the one or more programs include a method for executing any one of the above-mentioned active distribution network fault location methods.

[0093] Obviously, those skilled in the art should understand that the above modules or steps of the present invention can be implemented by a general computing device, they can be concentrated on a single computing device, or distributed on a network composed of multiple computing devices, they can be implemented by a program code executable by a computing device, so that they can be stored in a storage device and executed by the computing device, and in some cases, the steps shown or described can be executed in a different order than here, or they can be made into individual integrated circuit modules, or multiple modules or steps therein can be made into a single integrated circuit module for implementation. Thus, the present invention is not limited to any specific combination of hardware and software.

[0094] Those skilled in the art will appreciate that the embodiments of the present application may be provided as methods, systems, or computer program products. Therefore, the present application may adopt the form of a complete hardware embodiment, a complete software embodiment, or an embodiment in combination with software and hardware. Moreover, the present application may adopt the form of a computer program product implemented in one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) that include computer-usable program code.

[0095] The present application is described with reference to the flowcharts and / or block diagrams of the methods, devices (systems), and computer program products according to the embodiments of the present application. It should be understood that each process and / or box in the flowchart and / or block diagram, as well as the combination of the processes and / or boxes in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing device to generate a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the processes in the flowchart and / or block diagram. Figure 1 A process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0096] These computer program instructions may also be stored in a computer-readable memory capable of directing a computer or other programmable data processing device to operate in a specific manner, so that the instructions stored in the computer-readable memory produce an article of manufacture comprising an instruction device, which implements the process Figure 1 A process or multiple processes and / or boxes Figure 1 A function specified in one or more boxes.

[0097] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operating steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing instructions for implementing the process in the computer or other programmable device. Figure 1 A process or multiple processes and / or boxes Figure 1 The steps for the functions specified in one or more boxes.

[0098] In a typical configuration, a computing device includes one or more processors (CPU), input / output interfaces, network interfaces, and memory.

[0099] The memory may include non-permanent memory in a computer-readable medium, random access memory (RAM) and / or non-volatile memory in the form of read-only memory (ROM) or flash RAM. The memory is an example of a computer-readable medium.

[0100] Computer readable media include permanent and non-permanent, removable and non-removable media that can be implemented by any method or technology to store information. Information can be computer readable instructions, data structures, program modules or other data. Examples of computer storage media include, but are not limited to, phase change memory (PRAM), static random access memory (SRAM), dynamic random access memory (DRAM), other types of random access memory (RAM), read-only memory (ROM), electrically erasable programmable read-only memory (EEPROM), flash memory or other memory technology, compact disk read-only memory (CD-ROM), digital versatile disk (DVD) or other optical storage, magnetic cassettes, magnetic tape disk storage or other magnetic storage devices or any other non-transmission media that can be used to store information that can be accessed by a computing device. As defined herein, computer readable media does not include temporary computer readable media (transitory media), such as modulated data signals and carrier waves.

[0101] It should also be noted that the terms "include", "comprises" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, commodity or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, commodity or device. In the absence of more restrictions, the elements defined by the sentence "comprises a ..." do not exclude the existence of other identical elements in the process, method, commodity or device including the elements.

[0102] From the above description, it can be seen that the above embodiments of the present application achieve the following technical effects:

[0103] In the fault location method of the active distribution network of the present application, first, according to the network topology of the distribution network, a switching function for converting the status information of the section into the status information of the node is established, then according to the switching function, the telemetry information and telesignaling information corresponding to the node are obtained, and at least according to the telemetry information, it is determined whether the telesignaling information is distorted in the process of FTU reporting. In the case that the telesignaling information is distorted, the telesignaling information is corrected according to the telemetry information to obtain the target telesignaling information, and then the fitness function of the distribution network is established at least according to the switching function, the telemetry information and the target telesignaling information. Finally, the improved immune algorithm is used to determine the section of the distribution network where the fault occurs according to the fitness function. Compared with the problem in the prior art that the FTU in the distribution network is distorted or missing when uploading information, resulting in inaccurate fault location, the present application establishes a switch function to convert the status information of the section into the status information of the node, and when the telesignaling information of the node is distorted during the reporting process, the telesignaling information is corrected according to the telemetry information of the node to obtain the target telesignaling information, and then the fitness function of the distribution network is established. The improved immune algorithm is used to determine the fault section of the distribution network according to the fitness function, thereby ensuring that the fault section can be accurately located when the distribution network is distorted.

[0104] The above description is only the preferred embodiment of the present application and is not intended to limit the present application. For those skilled in the art, the present application may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A fault location method for an active distribution network, characterized in that: The network topology of the power distribution network includes a plurality of nodes and a plurality of sections, wherein the section represents a line between two adjacent nodes, and the method includes: At least according to the network topology, establishing a switch function of the distribution network, wherein the switch function is used to convert the state information of the segment into the state information of the node; According to the switch function, obtaining telemetry information and telesignaling information corresponding to the node; At least based on the telemetry information, determining whether the telesignaling information is distorted during the reporting process of the FTU; In the case where the remote signaling information is distorted, the remote signaling information is corrected according to the telemetry information to obtain target remote signaling information; Establishing a fitness function of the distribution network at least according to the switching function, the telemetry information and the target telesignaling information; The improved immune algorithm is used to determine the section of the distribution network where a fault occurs according to the fitness function.

2. The fault location method of the active power distribution network according to claim 1, characterized in that: At least according to the network topology, establishing a switching function of the distribution network includes: According to a first preset coding rule, the state of the node is encoded to obtain a node state code, and according to a second preset coding rule, the state of the segment is encoded to obtain a segment state code; The switch function is established according to the node state code, the segment state code and the network topology.

3. The fault location method of the active power distribution network according to claim 2, characterized in that: The distribution network includes a system power supply, a segmented switch and a distributed power supply. At least according to the network topology of the distribution network, a switch function of the distribution network is established, including: Using the first formula Second formula And the third formula Determine the switching function, where represents the expected value of the state information of the j-th segment switch, represents the expected value of the state information of the upstream part with the jth sectionalizing switch as the demarcation point, represents the expected value of the state information of the downstream part with the jth segment switch as the demarcation point, the upstream part is the part containing the system power supply with the jth segment switch as the demarcation point, the downstream part is the part without the system power supply with the jth segment switch as the demarcation point, M1 represents the number of upstream power supplies in the upstream part, the upstream power supply includes the system power supply and the distributed power supply, N1 represents the number of downstream power supplies in the downstream part, the downstream power supply includes the distributed power supply, M2 represents the number of the sections in the upstream part, and N2 represents the number of the sections in the downstream part, Indicates the jth segment switch to the upstream power supply S u The expected value of the status information of the segment on the path between Represents the jth segment switch to the downstream power supply S d The expected value of the status information of the segment on the path between j，d represents the expected value of the status information of the entire segment of the downstream part, x j，u represents the expected value of the state information of all the sections of the upstream part, Ku represents the switching factor of the distributed power source in the upstream part, K d represents the switching factor of the distributed power source in the downstream part. When the distributed power source is connected to the upstream part, K u The value is 1. When no distributed power source is connected to the upstream part, K u The value is 0. When the distributed power source is connected to the downstream part, K d The value is 1. When no distributed power source is connected to the downstream part, K d The value is 0, and Π is a logical "or" operation.

4. The fault location method of active power distribution network according to claim 1, characterized in that: Using an improved immune algorithm and according to the fitness function, determining the section where the distribution network fails, comprising: The improved immune algorithm is used to solve the fitness function to obtain the section where the distribution network fails.

5. The fault location method of active power distribution network according to claim 3, characterized in that: According to the first preset coding rule, the state of the node is encoded to obtain the node state code, including: using the fourth formula Determine the node status code, where Ij=1 indicates that the current flowing through the jth node has a fault and the current direction is the positive direction of the flow, Ij=0 indicates that the current flowing through the jth node has no fault, I j =-1 indicates that the current flowing through the jth node fails, and the current direction is the negative direction of the current flow, and the positive direction of the current flow is the direction from the system power supply to the distributed power supply or the segment switch, According to the second preset coding rule, the state of the segment is encoded to obtain the segment state code, including: using the fifth formula Determine the segment status code, wherein: x j =1 indicates that the i-th section has a fault, x j =0 indicates that no fault occurs in the jth section.

6. The fault location method of active power distribution network according to claim 5, characterized in that: At least based on the telemetry information, determining whether the telesignaling information is distorted during the reporting process of the FTU includes: Establishing a distortion information model according to the node state coding, wherein the distortion information model represents information distortion that may occur in the node state coding during FTU reporting; According to the distortion information model and the telemetry information, it is determined whether the telemetry information is distorted during the reporting process of the FTU.

7. The fault location method of active power distribution network according to claim 6, characterized in that: According to the node state encoding, a distortion information model is established, including: According to the node state coding, a false negative model and a false positive model are established, and the false negative model and the false positive model constitute the distortion information model, wherein the false negative model includes a first distortion type and a second distortion type, and the false positive model includes a third distortion type, a fourth distortion type, a fifth distortion type and a sixth distortion type, the first distortion type indicates that the node state coding is distorted from 1 to 0, the second distortion type indicates that the node state coding is distorted from -1 to 0, the third distortion type indicates that the node state coding is distorted from 1 to -1, the fourth distortion type indicates that the node state coding is distorted from -1 to 1, the fifth distortion type indicates that the node state coding is distorted from 0 to 1, and the sixth distortion type indicates that the node state coding is distorted from 0 to -1.

8. The fault location method of active power distribution network according to claim 7, characterized in that: At least according to the switch function, the telemetry information and the target telesignaling information, the fitness function of the distribution network is established, including: according to the underreporting model, the false alarm model, the switch function, the telemetry information and the target telesignaling information, the fitness function is established, According to the underreporting model, the false alarm model, the switch function, the telemetry information and the target telesignaling information, the fitness function is established, including: using the sixth formula Determine the fitness function, where F(x) represents the fitness function, I j represents the telemetry information corresponding to the jth segment switch, I″ j (x) represents the target telesignal information corresponding to the j-th section switch, x j represents the state information corresponding to the jth segment, M represents the total number of segment switches, ε1 represents a preset first weight coefficient, ε2 represents a preset second weight coefficient, ε3 represents a preset third weight coefficient, ε4 represents a preset fourth weight coefficient, represents a missing variable, Represents a false positive variable. When the distortion corresponding to the false negative model occurs The value is 1, when the distortion corresponding to the underreporting model does not occur The value is 0. When the distortion corresponding to the false alarm model occurs The value is 1, when the distortion corresponding to the false alarm model does not occur The value is 0.

9. A computer program product comprising computer instructions, characterized in that When the computer instructions are executed by a processor, the fault location method for an active power distribution network as claimed in any one of claims 1 to 8 is implemented.

10. An electronic device, characterized in that: include: One or more processors, a memory, and one or more programs, wherein the one or more programs are stored in the memory and are configured to be executed by the one or more processors, and the one or more programs include a method for executing the fault location method of the active power distribution network according to any one of claims 1 to 8.

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