Power distribution network single-phase earth fault positioning method and device based on multi-source information decision

Abstract

The invention discloses a power distribution network single-phase earth fault positioning method and device based on multi-source information decision, and relates to the technical field of power distribution network fault analysis, research and judgment and operation, maintenance and first-aid repair. The method comprises the following steps: when any alarm signal is received, determining an alarm bus according to the alarm signal; receiving a grounding alarm signal and a zero sequence current signal of a power distribution terminal outside an alarm bus lower station in a preset time window; filtering the grounding alarm signal and the zero sequence current signal according to the connection state of the power distribution terminal outside the station; and calculating a switch assignment based on the filtered grounding alarm signal and the zero sequence current signal, and judging a grounding fault occurrence position according to the switch assignment and a line topology relation. According to the method, rapid and accurate line selection and section selection of the single-phase earth fault of the distribution network are realized based on multi-source information by using monitoring equipment such as the distribution automation terminal, the power failure loss of users is reduced, and the power supply reliability is integrally improved.

Description

Technical Field

[0001] The present invention relates to the technical field of distribution network fault analysis and judgment and operation and maintenance emergency repair, and in particular to a distribution network single-phase grounding fault locating method and device based on multi-source information decision-making. Background Art

[0002] At present, the single-phase grounding fault treatment of the distribution network mainly uses the busbar grounding alarm in the substation and the line selection results of the dispatching master station to handle the grounding fault through trial pulling. Due to the complex distribution network architecture, misjudgment of the line selection algorithm, and the inconvenience of trial pulling for important users, the actual grounding line selection accuracy is low, and multiple line power outages are required to accurately identify the line of the grounding fault, which increases the user's power outage time and impact range.

[0003] Based on this, it is necessary to design a new method for single-phase grounding line selection and section selection in the distribution network, comprehensively utilize distribution automation terminals and other monitoring equipment, realize accurate line selection and section selection for single-phase grounding faults in the distribution network, support rapid handling of single-phase grounding faults in distribution lines, reduce power outage losses to users, and improve power supply reliability as a whole. Summary of the invention

[0004] The present invention provides a distribution network single-phase grounding fault locating method and device based on multi-source information decision-making, so as to solve the problems that the existing distribution network single-phase grounding fault locating method based on busbar grounding alarm and dispatching master station line selection results requires multiple pull-outs, has low fault locating efficiency and low locating accuracy.

[0005] The present invention is achieved through the following technical solutions:

[0006] A first aspect of the present invention provides a method for locating a single-phase grounding fault in a distribution network based on multi-source information decision-making, comprising:

[0007] When any alarm signal is received, an alarm bus is determined according to the alarm signal;

[0008] Receiving grounding alarm signals and zero-sequence current signals from all monitoring devices under the alarm bus and off-station power distribution terminals within a predetermined time window;

[0009] filtering the grounding alarm signal and the zero-sequence current signal according to the connection status of the off-station power distribution terminal;

[0010] The switch score is calculated based on the filtered grounding alarm signal and the zero-sequence current signal, and the location of the grounding fault is determined according to the switch score and the line topology relationship.

[0011] The present invention utilizes monitoring equipment such as distribution automation terminals. When a single-phase grounding fault occurs in a line, the distribution master station receives any alarm signal sent by each automation terminal, then starts the fault location program, determines the alarm bus, monitors the grounding alarm signal and zero-sequence current signal of all off-station distribution terminals under the alarm bus for a period of time, and filters the error signal to provide an accurate basis for fault location. The switch score is calculated based on the filtered grounding alarm signal and zero-sequence current signal, and the location of the grounding fault is determined by combining the switch score and the line topology relationship. Decisions are made based on multi-source information such as the grounding alarm signal, zero-sequence current signal, switch score, and line topology relationship, thereby improving the efficiency and accuracy of fault location.

[0012] Furthermore, the alarm signal includes a small current grounding line selection alarm signal within the substation, a busbar grounding alarm signal, and a small current grounding alarm signal and a zero-sequence overcurrent alarm signal of an external power distribution terminal.

[0013] Further, filtering the ground alarm signal and the zero-sequence current signal according to the connection status of the off-station power distribution terminal includes:

[0014] For off-site power distribution terminals in offline state, filter all signals sent by the off-site power distribution terminals;

[0015] For off-site distribution terminals in an online state, the faulty distribution terminal is determined according to the line topology relationship, and all signals sent by the faulty distribution terminal are filtered.

[0016] Furthermore, the method of determining the faulty power distribution terminal according to the line topology relationship includes:

[0017] Preliminarily determining the fault point according to the received grounding alarm signal;

[0018] According to the line topology relationship, the line between the in-station switch under the alarm bus and the fault point is searched, and the off-station distribution terminal on the line that does not send a ground alarm signal is determined as the faulty distribution terminal.

[0019] Furthermore, the calculating of the switch score based on the filtered grounding alarm signal and the zero-sequence current signal, and determining the location of the grounding fault according to the switch score and the line topology relationship include:

[0020] According to the correspondence between the off-site power distribution terminal and the monitored switch, a weighted calculation is performed based on the grounding alarm signal and the zero-sequence current signal corresponding to the switch to obtain a switch score;

[0021] According to the line topology relationship, the switch scores of two adjacent switches are subtracted to obtain the score value of the line segment between the two adjacent switches;

[0022] The line segment with the highest score is determined as the location where the ground fault occurs.

[0023] Furthermore, if the line segment with the highest score is not unique, the zero-sequence current of the nearest upstream distribution terminal is obtained, and the line segment with the largest zero-sequence current is determined as the location where the ground fault occurs.

[0024] Furthermore, the calculation formula for the switch score is:

[0025] y i =α1×G i +α2×I i

[0026] Among them, y i represents the switch score of switch i, G i Indicates the grounding alarm signal value of switch i, I i represents the zero-sequence current signal value of switch i, α1 and α2 are the ground alarm signal weight and the zero-sequence current signal weight respectively, and α1 and α2 satisfy: α1+α2=1 and α1>α2.

[0027] A second aspect of the present invention provides a single-phase grounding fault location device for a distribution network based on multi-source information decision-making, comprising:

[0028] A line selection and starting module, used for determining an alarm bus according to the alarm signal when any alarm signal is received;

[0029] A signal receiving module, used for receiving a grounding alarm signal and a zero-sequence current signal from an off-station power distribution terminal under the alarm bus within a predetermined time window;

[0030] A signal filtering module, used for filtering the grounding alarm signal and the zero-sequence current signal according to the connection status of the off-station power distribution terminal;

[0031] The fault location module is used to calculate the switch score based on the filtered grounding alarm signal and the zero-sequence current signal, and determine the location of the grounding fault according to the switch score and the line topology relationship.

[0032] According to a third aspect of the present invention, an electronic device is provided, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein when the processor executes the computer program, the method for locating a single-phase grounding fault in a distribution network based on multi-source information decision-making as described in any one of the first aspects of the present invention is implemented.

[0033] A fourth aspect of the present invention provides a computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, implements a method for locating a single-phase grounding fault in a distribution network based on multi-source information decision-making as described in any one of the first aspects of the present invention.

[0034] Compared with the prior art, the present invention has the following advantages and beneficial effects:

[0035] By using distribution automation terminal monitoring equipment, accurate line and section selection can be achieved for single-phase grounding faults in the distribution network, reducing power outage losses to users and improving overall power supply reliability.

[0036] Decisions are made based on multiple sources of information, including grounding alarm signals, zero-sequence current signals, switch assignments, and line topology relationships, which improves the efficiency and accuracy of fault location.

[0037] According to whether the off-site power distribution terminal is online or offline, invalid alarm signals or erroneous alarm signals can be quickly filtered out in combination with the line topology relationship, providing an accurate basis for fault location and improving the judgment results. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] In order to more clearly illustrate the technical solutions of the exemplary embodiments of the present invention, the following briefly introduces the drawings required for use in the embodiments. It should be understood that the following drawings only illustrate certain embodiments of the present invention and should not be regarded as limiting the scope. For those of ordinary skill in the art, other relevant drawings can be obtained based on these drawings without creative work. In the drawings:

[0039] Figure 1 It is a flow chart of a method for locating a single-phase grounding fault in a distribution network based on multi-source information decision-making according to an embodiment of the present invention;

[0040] Figure 2 It is a circuit topology diagram of an embodiment of the present invention;

[0041] Figure 3 It is another circuit topology diagram of an embodiment of the present invention;

[0042] Figure 4 It is a structural schematic diagram of an electronic device according to an embodiment of the present invention. DETAILED DESCRIPTION

[0043] In order to make the objectives, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with embodiments and drawings. The exemplary embodiments of the present invention and their description are only used to explain the present invention and are not intended to limit the present invention.

[0044] It should be noted that the terms "including" and "having" and any variations thereof in the specification and claims of the present invention and the above-mentioned drawings are intended to cover non-exclusive inclusions. For example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to or inherent to other steps or units of the device.

[0045] The terms used in the various embodiments of the application are only used to describe the purpose of specific embodiments and are not intended to limit the various embodiments of the application. As used herein, the singular form is intended to also include the plural form, unless the context clearly indicates otherwise. Unless otherwise limited, all terms used here (including technical terms and scientific terms) have the same meaning as the meanings commonly understood by ordinary technicians in the field of the various embodiments of the application. The terms (such as the terms defined in the dictionary generally used) will be interpreted as having the same meaning as the contextual meaning in the relevant technical field and will not be interpreted as having an idealized meaning or an overly formal meaning, unless clearly defined in the various embodiments of the application.

[0046] The embodiments of the present invention provide a method for locating single-phase grounding faults in a distribution network based on multi-source information decision-making, which is used to solve the problems of expanded power outage scope and prolonged power outage time caused by current means of handling grounding faults in distribution networks. Monitoring equipment such as distribution automation terminals are used to achieve accurate line and section selection for single-phase grounding faults in distribution networks, support rapid handling of single-phase grounding faults in distribution lines, reduce power outage losses to users, and improve power supply reliability as a whole.

[0047] like Figure 1 Shown is a flow chart of a method for locating a single-phase grounding fault in a distribution network based on multi-source information decision-making according to an embodiment of the present invention, which includes the following steps.

[0048] S1, when any alarm signal is received, determines the alarm bus according to the alarm signal.

[0049] S2, receiving grounding alarm signals and zero-sequence current signals from all monitoring devices under the alarm bus and the off-station distribution terminals within a predetermined time window.

[0050] S3, filtering the grounding alarm signal and the zero-sequence current signal according to the connection status of the off-station power distribution terminal.

[0051] S4, calculating the switch score based on the filtered grounding alarm signal and the zero-sequence current signal, and determining the location of the grounding fault according to the switch score and the line topology relationship.

[0052] The single-phase grounding fault location method of the distribution network based on multi-source information decision-making of the present invention is applied to the distribution master station, and the distribution automation terminal and other monitoring equipment are used to obtain the alarm signal of the distribution line. The distribution master station detects any alarm signal and starts the single-phase grounding line selection and section selection analysis. The alarm signal includes the small current grounding line selection alarm signal in the substation, the busbar grounding alarm signal, the small current grounding alarm of the distribution terminal outside the station, and the zero-sequence overcurrent alarm signal.

[0053] The distribution master station determines the alarm bus based on any alarm signal, which can be specifically located by the sending element of the alarm signal. After starting the single-phase grounding line selection and section analysis, the grounding alarm signals and zero-sequence currents of all monitoring devices under the same alarm bus and all distribution terminals outside the station are collected within a predetermined time window. Monitoring equipment refers to the small current grounding line selection device, line protection device, and grounding function module of the information system in the station, some of which are installed in the substation and some are deployed in the system program. The distribution terminal (Feeder Terminal Unit, FTU) is the monitoring terminal of the distribution switch, which has remote control, telemetry, telesignaling, and fault detection functions, and communicates with the distribution automation master station to provide the operation status of the distribution system and various parameters, that is, the information required for monitoring and control. Including switch status, electric energy parameters, phase-to-phase faults, grounding faults, and parameters at the time of fault, and executing the commands issued by the distribution master station, adjusting and controlling the distribution equipment, and realizing the functions of fault location, fault isolation, and rapid restoration of power supply in non-fault areas. In the present invention, the distribution terminal signal and the grounding signals of other devices and systems are taken into account for fault judgment.

[0054] When all information is collected within the predetermined time window, the distribution master station performs signal screening according to the connection status of the off-station distribution terminal to filter invalid or erroneous signals. Specifically, the method for filtering the ground alarm signal and zero-sequence current signal according to the connection status of the off-station distribution terminal is as follows:

[0055] For off-site power distribution terminals in offline state, filter all signals sent by the off-site power distribution terminals;

[0056] For off-site distribution terminals in online state, the faulty distribution terminal is determined according to the line topology relationship, and all signals sent from the faulty distribution terminal are filtered.

[0057] When the distribution terminal on the line is offline, the zero-sequence overcurrent, small current grounding alarm and other signals sent by it are judged as erroneous signals and are not involved in the analysis and judgment. If the distribution terminal on the line is online, the erroneous alarm signals are filtered according to the topology of the distribution network.

[0058] Further, the faulty power distribution terminal is determined according to the line topology relationship, specifically including:

[0059] S3-1, preliminarily determine the fault point based on the grounding alarm signal received by the power distribution master station;

[0060] S3-2, based on the line topology relationship, search for the line between the in-station switch under the alarm bus and the fault point, and determine the off-station distribution terminal on the line that has not sent the ground alarm information as the faulty distribution terminal.

[0061] See also Figure 2 The line topology diagram shown in Figure 2For example, when a ground fault occurs in the line between switch 3 and switch 4, a ground alarm should appear in switch 1, switch 2, and switch 3. The location of the distribution terminal where the ground alarm appears is determined as the fault point, that is, if the ground alarm signal of switch 1 and switch 3 is received, it can be preliminarily determined that there is a fault point between switch 1 and switch 2, and between switch 3 and switch 4. Taking the case of a ground fault in the line between switch 3 and switch 4, a ground alarm should appear in switch 1, switch 2, and switch 3 on the same feeder. If the distribution master station does not receive the ground alarm signal of switch 2, it is assumed that switch 2 is invalid and all information of switch 2 is filtered.

[0062] Furthermore, in step S4, the switch score is calculated based on the filtered grounding alarm signal and the zero-sequence current signal, and the location of the grounding fault is determined according to the switch score and the line topology relationship, which specifically includes:

[0063] S4-1, according to the correspondence between the off-site distribution terminal and the monitored switch, a weighted calculation is performed based on the grounding alarm signal and the zero-sequence current signal corresponding to the switch to obtain the switch score.

[0064] S4-2, according to the line topology relationship, subtract the switch scores of two adjacent switches to obtain the score value of the line segment between the two adjacent switches.

[0065] S4-3, determining the line segment with the highest score as the location where the ground fault occurs.

[0066] The calculation formula for switch scoring is as follows:

[0067] y i =α1×G i +α2×I i

[0068] Among them, y i represents the switch score of switch i, G i Indicates the grounding alarm signal value of switch i, I i represents the zero-sequence current signal value of switch i, α1 and α2 are the ground alarm signal weight and the zero-sequence current signal weight respectively, and α1 and α2 satisfy: α1+α2=1 and α1>α2.

[0069] See also Figure 3 The line topology diagram shown in Figure 3For example, if all 10kV line switches in the bus section have zero-sequence alarm and low-current grounding alarm functions, when grounding occurs between switch 2 and switch 3, the monitoring equipment of switch 1 and switch 2 will issue grounding alarm and zero-sequence alarm, switch 5 will issue a zero-sequence alarm but no grounding alarm, and the bus in the station will issue a grounding alarm signal to start the line selection and section selection procedure. In the switch scoring calculation stage, taking α1 as 0.8 and α2 as 0.2 as an example, the scoring values ​​of each switch are calculated as follows:

[0070] Switch 1 = 0.8 × G1 (ground alarm score) + 0.2 × I1 (zero sequence alarm score);

[0071] Switch 2 = 1 point;

[0072] Switch 3 = 0 points;

[0073] Switch 5 = 0.2 × I5 (zero-sequence alarm score).

[0074] According to the switch scoring combined with line topology, the scoring value of the line segment is calculated, and the line node is used instead of the line segment. The calculation is as follows:

[0075] Node 1 = switch 1 - switch 2 = 1 - 1 = 0 points, node 1 = switch 1 - branch switch 1 = 1-0 = 1 points, node 1 = switch 1 - branch switch 2 = 1 points;

[0076] Node 2 = switch 2 - switch 3 = 1 point, node 2 = switch 2 - branch switch 3 = 1 point;

[0077] Node 3 = switch 3 - switch 4 = 0 points;

[0078] Node 4 = branch switch 1-0 points = 0 points;

[0079] Node 5 = score switch 3 - 0 points = 0 points;

[0080] Node 6 = branch switch 2 - 0 points = 0 points;

[0081] Node 7 = switch 4 - 0 points = 0 points;

[0082] Node 8 = switch 5 - switch 6 = 0.2 - 0 = 0.2 points, node 8 = switch 5 - branch switch 4 = 0.2 - 0 = 0.2 points;

[0083] Nodes 9 to 11 are all 0 points.

[0084] Compare nodes 1 to 11. The maximum value of the selected segment score is 1, and the only node with all node values ​​of 1 is node 2. Therefore, it is determined that the fault is at node 2.

[0085] Furthermore, the area where the ground fault occurs is determined according to the weighted scoring rules and the line topology relationship. If the line selection result is unique, the determination result is output; if the line selection result is not unique, the determination result is output after comprehensive analysis combined with the zero-sequence current value. Specifically, the zero-sequence current of the nearest distribution terminal upstream of the line segment selected according to the weighted scoring result is obtained, and the line segment with the largest zero-sequence current is determined as the location where the ground fault occurs.

[0086] Furthermore, when the in-station device or in-station system has a line selection result, the distribution master station will merge it with the weighted scoring result to generate the final judgment result, otherwise the weighted scoring line selection section is used as the final judgment result. For example, the comprehensive in-station line selection result and weighted scoring result judgment are as follows: according to the order of the in-station line selection device, the weighted scoring fault line segment is weighted by coefficient, and the highest score is the final judgment result.

[0087] The embodiment of the present invention also provides a distribution network single-phase grounding fault location device based on multi-source information decision-making, which is used to execute the distribution network single-phase grounding fault location method based on multi-source information decision-making. It includes:

[0088] A line selection and starting module, used for determining an alarm bus according to the alarm signal when any alarm signal is received;

[0089] A signal receiving module, used for receiving a grounding alarm signal and a zero-sequence current signal from an off-station power distribution terminal under the alarm bus within a predetermined time window;

[0090] A signal filtering module, used for filtering the grounding alarm signal and the zero-sequence current signal according to the connection status of the off-station power distribution terminal;

[0091] The fault location module is used to calculate the switch score based on the filtered grounding alarm signal and the zero-sequence current signal, and determine the location of the grounding fault according to the switch score and the line topology relationship.

[0092] An embodiment of the present invention further provides an electronic device, such as Figure 4 As shown, Figure 4 FIG. 4 is a schematic diagram of the structure of an electronic device of the present invention, wherein the electronic device comprises a processor 40, a memory 41, an input device 42, an output device 43 and a communication device 44; the number of processors 40 in the computer device can be one or more. Figure 4 The processor 40, the memory 41, the input device 42 and the output device 43 in the electronic device can be connected by a bus or other means. Figure 4 The example of connecting through bus is taken in the following.

[0093] The memory 41 is a computer-readable storage medium that can be used to store software programs, computer executable programs, and modules. The processor 40 executes various functional applications and data processing of the electronic device by running the software programs, instructions, and modules stored in the memory 41, so as to implement the single-phase grounding fault location device for distribution network based on multi-source information decision-making according to any of the above embodiments of the present invention.

[0094] The memory 41 may mainly include a program storage area and a data storage area, wherein the program storage area may store an operating system and at least one application required for a function; the data storage area may store data created according to the use of the terminal, etc. In addition, the memory 41 may include a high-speed random access memory, and may also include a non-volatile memory, such as at least one disk storage device, a flash memory device, or other non-volatile solid-state storage device. In some instances, the memory 41 may further include a memory remotely arranged relative to the processor 40, and these remote memories may be connected to the electronic device 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 combinations thereof.

[0095] The input device 42 may be used to receive user IDs, instructions, and external data, and the output device 43 may be used to output intermediate data, analysis results, network configuration pages, and the like.

[0096] An embodiment of the present invention further provides a computer-readable storage medium on which a computer program is stored. When the computer program is executed by a processor, the method for locating a single-phase grounding fault in a distribution network based on multi-source information decision-making according to any embodiment of the present invention is implemented. The storage medium may be a ROM / RAM, a magnetic disk, an optical disk, etc.

[0097] An embodiment of the present invention further provides a computer program product. When the computer program product is run on a computer, the computer executes the method for locating a single-phase grounding fault in a distribution network based on multi-source information decision-making according to any of the above embodiments of the present invention.

[0098] The specific implementation methods described above further illustrate the objectives, technical solutions and beneficial effects of the present invention in detail. It should be understood that the above description is only a specific implementation method of the present invention and is not intended to limit the scope of protection of the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A single-phase grounding fault location method for distribution network based on multi-source information decision-making, characterized in that: include: When any alarm signal is received, an alarm bus is determined according to the alarm signal; Receiving grounding alarm signals and zero-sequence current signals from all monitoring devices under the alarm bus and off-station power distribution terminals within a predetermined time window; filtering the grounding alarm signal and the zero-sequence current signal according to the connection status of the off-station power distribution terminal; The switch score is calculated based on the filtered grounding alarm signal and the zero-sequence current signal, and the location of the grounding fault is determined according to the switch score and the line topology relationship.

2. The method for locating single-phase grounding fault in distribution network based on multi-source information decision according to claim 1 is characterized in that: The alarm signals include a small current grounding line selection alarm signal in the substation, a busbar grounding alarm signal, and a small current grounding alarm signal and a zero-sequence overcurrent alarm signal of an external power distribution terminal.

3. The method for locating single-phase grounding fault in distribution network based on multi-source information decision according to claim 1, characterized in that: The filtering of the grounding alarm signal and the zero-sequence current signal according to the connection state of the off-station power distribution terminal includes: For off-site power distribution terminals in offline state, filter all signals sent by the off-site power distribution terminals; For off-site distribution terminals in an online state, the faulty distribution terminal is determined according to the line topology relationship, and all signals sent by the faulty distribution terminal are filtered.

4. The method for locating single-phase grounding fault in distribution network based on multi-source information decision according to claim 3 is characterized in that: The method of determining the faulty power distribution terminal according to the line topology relationship includes: Preliminarily determining the fault point according to the received grounding alarm signal; According to the line topology relationship, the line between the in-station switch under the alarm bus and the fault point is searched, and the off-station distribution terminal on the line that does not send a ground alarm signal is determined as the faulty distribution terminal.

5. The method for locating single-phase grounding fault in distribution network based on multi-source information decision according to claim 1, characterized in that: The calculating the switch score based on the filtered grounding alarm signal and the zero-sequence current signal, and determining the location of the grounding fault according to the switch score and the line topology relationship, includes: According to the correspondence between the off-site power distribution terminal and the monitored switch, a weighted calculation is performed based on the grounding alarm signal and the zero-sequence current signal corresponding to the switch to obtain a switch score; According to the line topology relationship, the switch scores of two adjacent switches are subtracted to obtain the score value of the line segment between the two adjacent switches; The line segment with the highest score is determined as the location where the ground fault occurs.

6. The method for locating single-phase grounding fault in distribution network based on multi-source information decision-making according to claim 5 is characterized in that: If the line segment with the highest score is not unique, the zero-sequence current of the nearest upstream distribution terminal is obtained, and the line segment with the largest zero-sequence current is determined as the location where the ground fault occurs.

7. The method for locating single-phase grounding fault in distribution network based on multi-source information decision-making according to claim 5, characterized in that: The calculation formula for the switch scoring is: and i =α1×G i +α2×I i Among them, y i represents the switch score of switch i, G i Indicates the grounding alarm signal value of switch i, I i represents the zero-sequence current signal value of switch i, α1 and α2 are the ground alarm signal weight and the zero-sequence current signal weight respectively, and α1 and α2 satisfy: α1+α2=1 and α1>α2.

8. A single-phase grounding fault location device for a distribution network based on multi-source information decision-making, characterized in that: include: A line selection and starting module, used for determining an alarm bus according to the alarm signal when any alarm signal is received; A signal receiving module, used for receiving a grounding alarm signal and a zero-sequence current signal from an off-station power distribution terminal under the alarm bus within a predetermined time window; A signal filtering module, used for filtering the grounding alarm signal and the zero-sequence current signal according to the connection status of the off-station power distribution terminal; The fault location module is used to calculate the switch score based on the filtered grounding alarm signal and the zero-sequence current signal, and determine the location of the grounding fault according to the switch score and the line topology relationship.

9. An electronic device comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein: When the processor executes the computer program, the method for locating a single-phase grounding fault in a distribution network based on multi-source information decision-making as described in any one of claims 1 to 7 is implemented.

10. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by a processor, the method for locating a single-phase grounding fault in a distribution network based on multi-source information decision-making as described in any one of claims 1 to 7 is implemented.

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