Power transmission and distribution line fault judgment method, system, device and equipment based on topology dynamic reconstruction and medium

Abstract

The invention discloses a power transmission and distribution line fault judgment method, system, device and equipment based on topology dynamic reconstruction, and a medium, and the method comprises the steps: obtaining a first line topological graph of a power transmission and distribution line, recognizing a first fault indicator according to the monitoring data before the fault occurrence moment, and removing the first fault indicator from the first line topological graph, obtaining a second line topological graph; and reconstructing the second line topological graph according to the current magnitude of the second fault indicator, reconstructing the serial numbers and the front and back hierarchical relationship of the remaining fault indicators, obtaining a third line topological graph, obtaining target recording data, and carrying out fault analysis according to the third line topological graph and the target recording data to obtain fault data. According to the invention, the power transmission and distribution line fault judgment efficiency and accuracy can be improved.

Description

Technical Field

[0001] The present application relates to the field of power transmission and distribution line monitoring, and in particular to a power transmission and distribution line fault judgment method, system, device, equipment and medium based on topology dynamic reconstruction. Background Art

[0002] As the proportion of electricity in terminal energy consumption gradually increases, electricity users have higher and higher requirements for power supply reliability. Therefore, transmission and distribution lines should have higher resilience and should be able to quickly locate faults, eliminate faults and restore power supply when line faults occur.

[0003] However, the transmission and distribution grid structure is large and complex, and its operation often changes due to line maintenance or load transfer operations. Existing fault diagnosis methods analyze and determine fault characteristics within a fixed grid structure, emphasizing full coverage of the entire line. This approach is inconsistent with the flexible and ever-changing nature of transmission and distribution grid operation, mixing in invalid information and inefficiently conducting the diagnosis process, leading to inaccurate results. Summary of the Invention

[0004] The present application aims to propose a method, system, device, equipment and medium for determining power transmission and distribution line faults based on dynamic topology reconstruction, which can improve the efficiency and accuracy of power transmission and distribution line fault determination.

[0005] In a first aspect, an embodiment of the present application provides a method for determining a power transmission and distribution line fault based on dynamic topology reconstruction, which is applied to a server and includes the following steps:

[0006] Acquire a first line topology map of the transmission and distribution line, where the first line topology map is used to indicate initial numbers, initial levels, and location information of all fault indicators of the transmission and distribution line;

[0007] Identifying a first fault indicator based on monitoring data before the fault occurs, wherein the monitoring data is current and electric field data of all fault indicators, and the first fault indicator is used to indicate a fault indicator with zero current and zero electric field;

[0008] Eliminate the first fault indicator from the first line topology diagram to obtain a second line topology diagram;

[0009] Reconstructing the second line topology map according to the current magnitude of the second fault indicator, reconstructing the numbers and previous and next hierarchical relationships of the remaining fault indicators, and obtaining a third line topology map, wherein the third line topology map is used to indicate the current numbers, current hierarchies, and location information of the remaining fault indicators, wherein the second fault indicators are the fault indicators other than the first fault indicator among all the fault indicators;

[0010] Acquiring target recorded wave data, wherein the target recorded wave data is recorded wave data of the second fault indicator after the fault occurs;

[0011] A fault analysis is performed based on the third line topology diagram and the target recorded wave data to obtain fault data, where the fault data is used to indicate the fault type and the fault location.

[0012] According to some embodiments of the present application, before obtaining the initial line topology data of the transmission and distribution line, the method further includes:

[0013] Obtain the grid diagram of transmission and distribution lines;

[0014] According to the grid diagram, all fault indicators in the transmission and distribution lines are numbered and assigned to levels to obtain a first line topology diagram.

[0015] According to some embodiments of the present application, the first line topology map further includes location information of the fault indicator. The method of numbering and hierarchically assigning all fault indicators in the transmission and distribution lines according to the grid diagram of the transmission and distribution lines to obtain the first line topology map includes:

[0016] Obtain the location information of the tower according to the grid diagram;

[0017] Bind each fault indicator to the nearest tower, and generate the position information of the fault indicator according to the position information of the tower;

[0018] According to the grid diagram of the power transmission and distribution line, all fault indicators in the power transmission and distribution line are numbered and assigned to levels to obtain initial numbers and initial levels of all fault indicators;

[0019] A first line topology diagram is obtained according to the initial numbers and initial levels of all fault indicators and the position information of the fault indicators.

[0020] According to some embodiments of the present application, the fault data includes ground fault data, and performing fault analysis based on the third line topology diagram and the target recorded waveform data to obtain the fault data includes:

[0021] Acquire the zero-sequence current of each second fault indicator after the fault moment according to the target recorded data;

[0022] According to the magnitude and polarity of the zero-sequence current of each second fault indicator after the fault moment, two adjacent second fault indicators with the largest and second largest zero-sequence current values ​​and opposite polarities are selected as ground fault indicators;

[0023] According to the third line topology diagram, the line section between the two first target fault indicators is used as a ground fault section and ground fault data is generated.

[0024] According to some embodiments of the present application, the fault data includes short-circuit fault data, and performing fault analysis based on the third line topology diagram and the target recorded waveform data to obtain the fault data includes:

[0025] Acquire the phase current amplitude and phase of each second fault indicator after the fault moment according to the target recorded data;

[0026] According to the phase current amplitudes and phases of the respective second fault indicators after the fault moment, second fault indicators with the same phase current amplitudes and phases of any two or three phases are selected as short-circuit fault indicators;

[0027] According to the third line topology diagram, a line section between the short-circuit fault indicator and an adjacent second fault indicator where no short-circuit fault occurs is used as a short-circuit fault section and short-circuit fault data is generated.

[0028] According to some embodiments of the present application, the fault data includes disconnection fault data, and performing fault analysis based on the third line topology diagram and the target recorded waveform data to obtain the fault data includes:

[0029] Acquire the phase current and phase electric field of each second fault indicator after the fault moment according to the target recorded data;

[0030] According to the phase current and electric field of each second fault indicator after the fault moment, a second fault indicator with zero phase current and zero phase electric field amplitude is selected as a line break fault indicator;

[0031] According to the third line topology diagram, a line section between the line break fault indicator and an adjacent second fault indicator where no line break fault occurs is used as a line break fault section and line break fault data is generated.

[0032] In the second aspect, an embodiment of the present application provides a power transmission and distribution line monitoring system, including a master station and multiple fault indicators distributed on the power transmission and distribution line, the master station is communicatively connected to the fault indicators, and the master station performs fault judgment through the power transmission and distribution line fault judgment method based on topology dynamic reconstruction described in the first aspect.

[0033] In a third aspect, an embodiment of the present application provides a power transmission and distribution line fault diagnosis device, comprising:

[0034] A first topology generating module is configured to obtain a first line topology map of the transmission and distribution line, wherein the first line topology map is configured to indicate initial numbers and initial levels of all fault indicators of the transmission and distribution line;

[0035] a monitoring data acquisition module, configured to identify a first fault indicator based on monitoring data obtained before a fault occurs, wherein the monitoring data is current and electric field data of all fault indicators, and the first fault indicator is configured to indicate a fault indicator having zero current and zero electric field;

[0036] A second topology generating module is configured to remove the first fault indicator from the first line topology map to obtain a second line topology map;

[0037] a topology reconstruction module, configured to reconstruct the second line topology map according to the current magnitude of the second fault indicator, reconstruct the numbers and previous and next hierarchical relationships of the remaining fault indicators, and obtain a third line topology map, wherein the third line topology map is used to indicate the current numbers and current hierarchical levels of the remaining fault indicators, and the second fault indicators are the fault indicators other than the first fault indicator among all the fault indicators;

[0038] A wave recording data acquisition module is used to acquire target wave recording data, wherein the target wave recording data is the wave recording data of the second fault indicator after the fault occurs;

[0039] The fault analysis module is used to perform fault analysis based on the third line topology diagram and the target recorded wave data to obtain fault data, where the fault data is used to indicate the fault type and fault location.

[0040] In a fourth aspect, an embodiment of the present application provides an electronic device, the device comprising: a processor and a memory storing computer program instructions;

[0041] When the processor executes the computer program instructions, the method for determining power transmission and distribution line faults based on dynamic topology reconstruction as described in the first aspect is implemented.

[0042] In a fifth aspect, an embodiment of the present application provides a computer-readable storage medium having computer program instructions stored thereon. When the computer program instructions are executed by a processor, the method for determining power transmission and distribution line faults based on dynamic topology reconstruction as described in the first aspect is implemented.

[0043] The power transmission and distribution line fault diagnosis method, system, device, equipment, and medium based on dynamic topology reconstruction according to the embodiments of the present application have at least the following beneficial effects:

[0044] In this embodiment, a first line topology diagram of the power transmission and distribution line is first obtained, and then a first fault indicator is identified based on monitoring data before the fault occurs; then the first fault indicator is removed from the first line topology diagram to obtain a second line topology diagram; then the second line topology diagram is reconstructed based on the current magnitude of the second fault indicator, and the numbers and hierarchical relationships of the remaining fault indicators are reconstructed to obtain a third line topology diagram; then target waveform data is obtained, and fault analysis is performed based on the third line topology diagram and the target waveform data to obtain fault data. This application eliminates invalid fault indicators based on monitoring data before the fault occurs, and performs fault judgment based on the reconstructed line topology, which can improve the efficiency and accuracy of power transmission and distribution line fault judgment.

[0045] Additional aspects and advantages of the present application will be given in part in the description below, and in part will become obvious from the description below, or will be learned through practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0046] The present application is further described below with reference to the accompanying drawings and embodiments, wherein:

[0047] Figure 1 A flow chart of an embodiment of a method for determining a power transmission and distribution line fault based on dynamic topology reconstruction provided by the present application;

[0048] Figure 2 This is an example diagram of a first line topology diagram in this application;

[0049] Figure 3 This is an example diagram of a third line topology diagram in this application;

[0050] Figure 4 This is an example diagram of another third line topology diagram in this application;

[0051] Figure 5 This is an example diagram of the line topology judgment of the short circuit fault in this application;

[0052] Figure 6 This is an example diagram of line topology judgment for line break fault in this application;

[0053] Figure 7 This is a schematic diagram of the structure of the power transmission and distribution line fault judgment device provided in this application;

[0054] Figure 8 This is a schematic diagram of the structure of the electronic device provided in this application. DETAILED DESCRIPTION

[0055] The features and exemplary embodiments of various aspects of the present application will be described in detail below. In order to make the purpose, technical solutions and advantages of the present application clearer, the present application will be further described in detail below in conjunction with the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described herein are only intended to explain the present application, rather than to limit the present application. For those skilled in the art, the present application can be implemented without the need for some of these specific details. The following description of the embodiments is merely to provide a better understanding of the present application by illustrating the examples of the present application.

[0056] In this document, relational terms such as first and second, etc., are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "comprises," "comprising," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or device comprising a series of elements includes not only those elements, but also other elements not explicitly listed, or elements inherent to such process, method, article, or device. In the absence of further limitations, an element defined by the phrase "comprising..." does not exclude the presence of additional identical elements in the process, method, article, or device comprising the elements.

[0057] As the proportion of electricity in terminal energy consumption gradually increases, electricity users have higher and higher requirements for power supply reliability. Therefore, transmission and distribution lines should have higher resilience and should be able to quickly locate faults, eliminate faults and restore power supply when line faults occur.

[0058] However, the transmission and distribution grid structure is large and complex, and its operation often changes due to line maintenance or load transfer operations. Existing fault diagnosis methods analyze and determine fault characteristics within a fixed grid structure, emphasizing full coverage of the entire line. This approach is inconsistent with the flexible and ever-changing nature of transmission and distribution grid operation, mixing in invalid information and inefficiently conducting the diagnosis process, leading to inaccurate results.

[0059] In order to solve the problems of the prior art, the embodiments of the present application provide a method, system, device, equipment and medium for determining power transmission and distribution line faults based on dynamic topology reconstruction. The following first introduces the method for determining power transmission and distribution line faults based on dynamic topology reconstruction provided by the embodiments of the present application.

[0060] Figure 1 The schematic diagram of the process of the power transmission and distribution line fault diagnosis method based on topology dynamic reconstruction provided by the embodiment of the present application is shown. The method is applied to a server, which can be set up in the cloud or in an independent local computer room.

[0061] A method for determining power transmission and distribution line faults based on dynamic topology reconstruction, applied to a server, comprises the following steps:

[0062] S101: Acquire a first line topology map of a power transmission and distribution line, where the first line topology map is used to indicate initial numbers and initial levels of all fault indicators of the power transmission and distribution line;

[0063] S102. Identify a first fault indicator based on monitoring data before the fault occurs, where the monitoring data is current and electric field data of all fault indicators, and the first fault indicator is used to indicate a fault indicator where the current and electric field are zero;

[0064] S103, removing the first fault indicator from the first line topology map to obtain a second line topology map;

[0065] S104: Reconstruct the second line topology map based on the current of the second fault indicator, reconstruct the numbers and previous and next hierarchical relationships of the remaining fault indicators, and obtain a third line topology map. The third line topology map is used to indicate the current numbers and current hierarchical levels of the remaining fault indicators. The second fault indicators are the fault indicators other than the first fault indicator among all the fault indicators.

[0066] S105, obtaining target recorded wave data, where the target recorded wave data is the recorded wave data of the second fault indicator after the fault occurs;

[0067] S106 , performing fault analysis based on the third line topology diagram and the target recorded wave data to obtain fault data, where the fault data is used to indicate the fault type and fault location.

[0068] In this embodiment, a first line topology diagram of the power transmission and distribution line is first obtained, and then a first fault indicator is identified based on monitoring data before the fault occurs; then the first fault indicator is removed from the first line topology diagram to obtain a second line topology diagram; then the second line topology diagram is reconstructed based on the current magnitude of the second fault indicator, and the numbers and hierarchical relationships of the remaining fault indicators are reconstructed to obtain a third line topology diagram; then target waveform data is obtained, and fault analysis is performed based on the third line topology diagram and the target waveform data to obtain fault data. This application eliminates invalid fault indicators based on monitoring data before the fault occurs, and performs fault judgment based on the reconstructed line topology, which can improve the efficiency and accuracy of power transmission and distribution line fault judgment.

[0069] The first line topology map in the above step S101 refers to the initial line topology map of the entire transmission and distribution line. The initial line topology map records all fault indicators on the transmission and distribution line, and can reflect the order of the fault indicators and their positions in the line. The initial line topology map can also include information on all power substations, important poles and towers of trunk and branch lines, and other transmission and distribution lines in the transmission and distribution line.

[0070] It should be noted that fault analysis needs to analyze and locate the fault interval according to the hierarchy, so the fault indicators need to be assigned hierarchically, and the numbers can indicate the order relationship between the fault indicators. The initial number and initial level of the fault indicator in the first line topology diagram are obtained after numbering and assigning levels to all the fault indicators on the transmission and distribution lines. For example, in the embodiment of the present application, the one closest to the power source is taken as the 0th level, and when encountering a branch in the load direction, the level is increased by 1, and the same level is distinguished by numbers. In addition to its own number, the fault indicator also retains the number of the previous fault indicator and the number of the next fault indicator, thereby forming a hierarchical relationship between the previous and next levels.

[0071] The first line topology map can be obtained by directly calling or querying an existing line topology map, or by constructing a line topology map including power substations, important towers of trunk and branch lines, and fault indicators based on a grid diagram of the transmission and distribution lines.

[0072] Identifying the first fault indicator based on the monitoring data before the fault occurs in the above step S102 refers to finding a fault indicator with zero current and zero electric field based on the monitoring data.

[0073] Since the fault indicator collects line current and electric field in real time and uploads them to the main station server, the main station server can analyze the monitoring data before the fault occurs and use the fault indicator with zero current and electric field as the first fault indicator.

[0074] In the above-mentioned step S103, the first fault indicator is removed from the first line topology diagram to obtain the second line topology diagram, which means that the first fault indicator of the first line topology diagram is removed, which is equivalent to removing the line section corresponding to the first fault indicator. Because the current value and electric field of the fault indicator are zero, it means that the line section where the fault indicator is located has been disconnected from the grid by the high-voltage switch and has become a non-energized line section, such as a power outage area. Since this occurs before the fault occurs, the data of this part of the fault indicator is invalid data for fault analysis. After removal, the efficiency of fault information can be improved.

[0075] It should be understood that the second line topology diagram is obtained by removing the first fault indicators of the non-powered sections from the first line topology diagram, and the numbers and levels of the remaining fault indicators are still the initial numbers and initial levels.

[0076] In step S104, the second line topology is reconstructed based on the current of the second fault indicator, and the numbering and hierarchical relationship of the remaining fault indicators are reconstructed to obtain a third line topology. This involves reconstructing the hierarchical relationship of the remaining fault indicators based on the line current and electric field in the line topology before the fault, and renumbering them. The resulting third line topology, i.e., the line topology with the first fault indicator removed and the hierarchical relationship and numbering reconstructed, can reflect the actual line topology of the transmission and distribution line before the fault occurs, eliminating invalid information.

[0077] It should be noted that the specific steps for reconstructing the numbering and previous and next hierarchical relationships of the remaining fault indicators are as follows:

[0078] acquiring current data of all second fault indicators from the monitoring data;

[0079] The second fault indicator with the largest current is regarded as the 0th layer;

[0080] According to the second fault indicator of layer 0 and the second line topology, new hierarchies are constructed in order of current magnitude. The current of the preceding fault indicator is greater than or equal to that of the succeeding fault indicator. The hierarchies of the remaining fault indicators are dynamically determined based on the current magnitude and the pre-set preceding and succeeding levels. The remaining fault indicators are numbered according to the new hierarchies and the relationship between the preceding and succeeding levels. Different fault indicators of the same hierarchical level are numbered in order of their preceding and succeeding positions to obtain a third line topology.

[0081] In the above step S105, the above acquisition of target recorded data means that the second fault indicator monitors the fault event in real time and generates a recorded file, and transmits the recorded file to the main station server. The main station can obtain the target recorded data through the recorded file.

[0082] In the above step S106, fault analysis is performed based on the third line topology map and the target recorded data to obtain fault data. This means that based on the reconstructed front-to-back hierarchical relationship, the recorded files of all second fault indicators in the third line topology map are analyzed layer by layer starting from the new 0th level, fault judgment criteria are extracted, and fault analysis and location are completed.

[0083] Specifically, the fault indicator can be located by pre-selecting the nearest tower in the topology map as the actual geographical location of the fault indicator, or by calibrating the actual geographical location of each fault indicator using longitude and latitude.

[0084] It should be noted that the fault data includes ground faults, short circuit faults, disconnection faults, etc.

[0085] In some embodiments, before obtaining the initial line topology data of the transmission and distribution line, the following steps may also be included:

[0086] Obtain the grid diagram of transmission and distribution lines;

[0087] According to the grid diagram, all fault indicators in the transmission and distribution lines are numbered and assigned to levels to obtain a first line topology diagram.

[0088] In this implementation, a grid diagram of the power transmission and distribution lines is first obtained. Then, based on the grid diagram, all fault indicators in the power transmission and distribution lines are numbered and assigned hierarchies to obtain a first line topology diagram. This allows for a more reasonable and comprehensive first line topology diagram, further improving the efficiency of subsequent fault diagnosis.

[0089] The aforementioned transmission and distribution line grid diagram refers to a topological diagram of the transmission and distribution lines, excluding the numbering and hierarchical allocation of fault indicators. This diagram illustrates the path of power from the power source (e.g., substation) to the user, the equipment connection structure, and the power supply area division. It includes the physical connections between power substations, key towers for trunk and branch lines, and fault indicators.

[0090] The above-mentioned numbering and hierarchical allocation of all fault indicators in the transmission and distribution lines according to the grid diagram refers to numbering and hierarchical allocation of the fault indicators of the line topology diagram based on the construction of a line topology diagram including power substations, important towers of trunk and branch lines, and fault indicators, to obtain the first line topology diagram including the initial number and initial hierarchy of the fault indicators. The method for assigning hierarchies to fault indicators is as follows: each fault indicator has its own unique number, which includes a hierarchy number and a sequence number. The closest to the power source (substation) is level 0. When encountering a line branch in the direction of load, the hierarchy number is increased by 1. Different fault indicators at the same level are distinguished by sequence numbers. In addition to its own number, the fault indicator also retains the number of the previous fault indicator and the number of the next fault indicator, thereby forming a hierarchical relationship between the previous and next levels.

[0091] In some embodiments, the first line topology map further includes location information of the fault indicators. According to the grid diagram of the transmission and distribution lines, all fault indicators in the transmission and distribution lines are numbered and hierarchically assigned to obtain the first line topology map, which may include:

[0092] Obtain the location information of the tower according to the grid diagram;

[0093] Bind each fault indicator to the nearest tower, and generate the position information of the fault indicator according to the position information of the tower;

[0094] According to the grid diagram of the transmission and distribution lines, all fault indicators in the transmission and distribution lines are numbered and assigned levels, and the initial numbers and initial levels of all fault indicators are obtained;

[0095] A first line topology map is obtained according to the initial numbers and initial levels of all fault indicators and the position information of the fault indicators.

[0096] In this embodiment, tower location information is obtained based on a grid diagram; each fault indicator is associated with the nearest tower, and the fault indicator location information is generated based on the tower location information; all fault indicators in the transmission and distribution line are numbered and assigned levels based on the grid diagram of the transmission and distribution line, obtaining initial numbers and levels for all fault indicators; and a first line topology is obtained based on the initial numbers and levels of all fault indicators and the location information of the fault indicators. By associating the fault indicator with the nearest tower and generating the fault indicator location information in the first line topology, the accuracy of fault location can be further improved.

[0097] Since the number and level of the fault indicator can change dynamically, it is impossible to determine the exact location of the fault indicator based on the number or level. However, the location of the fault is an important part of fault diagnosis. Using longitude and latitude to calibrate the actual geographical location of each fault indicator is relatively cumbersome. Even if the longitude and latitude are known, it still requires map conversion to match them with the actual location. Since the location of each tower is marked in the grid map, the fault indicator can be bound to the nearest tower to obtain a fixed position of the fault indicator, which is convenient for positioning in subsequent fault diagnosis.

[0098] In some embodiments, the fault data includes ground fault data, and performing fault analysis based on the third line topology diagram and the target waveform data to obtain the fault data may include:

[0099] Acquire the zero-sequence current of each second fault indicator after the fault moment according to the target recorded data;

[0100] According to the magnitude and polarity of the zero-sequence current of each second fault indicator after the fault moment, two adjacent second fault indicators with the largest and second largest zero-sequence current values ​​and opposite polarities are selected as ground fault indicators;

[0101] According to the third line topology diagram, the line section between the two first target fault indicators is used as a ground fault section and ground fault data is generated.

[0102] In this implementation, the zero-sequence current of each second fault indicator after the fault moment is first obtained based on the target recorded waveform data. Based on the magnitude and polarity of the zero-sequence current of each second fault indicator after the fault moment, two adjacent second fault indicators with the largest and second largest zero-sequence current values ​​and opposite polarities are selected as ground fault indicators. Based on the third line topology, the line section between the two first target fault indicators is identified as the ground fault section, and ground fault data is generated. This allows for accurate ground fault identification, further improving the efficiency and accuracy of transmission and distribution line fault diagnosis.

[0103] The above-mentioned obtaining the zero-sequence current of each second fault indicator after the fault moment according to the target recording data refers to obtaining the zero-sequence current of each second fault indicator after the fault moment according to the recording file.

[0104] The aforementioned method of selecting, based on the magnitude and polarity of the zero-sequence currents of each second fault indicator after the fault moment, the two adjacent second fault indicators with the largest and second largest zero-sequence current values ​​and opposite polarities as ground fault indicators refers to sorting the zero-sequence currents after the fault moment and, based on the zero-sequence current polarity information, selecting the two adjacent second fault indicators with the largest and second largest zero-sequence current values ​​and opposite polarities as ground fault indicators. The line section between these two ground fault indicators is the ground fault section.

[0105] In some embodiments, the fault data includes short-circuit fault data, and performing fault analysis based on the third line topology diagram and the target recorded waveform data to obtain the fault data may include:

[0106] Acquire the phase current amplitude and phase of each second fault indicator after the fault moment according to the target recorded data;

[0107] According to the phase current amplitudes and phases of the respective second fault indicators after the fault moment, second fault indicators with the same phase current amplitudes and phases of any two or three phases are selected as short-circuit fault indicators;

[0108] According to the third line topology diagram, a line section between the short-circuit fault indicator and an adjacent second fault indicator where no short-circuit fault occurs is used as a short-circuit fault section and short-circuit fault data is generated.

[0109] In this implementation, the phase current amplitude and phase of each second fault indicator after the fault moment are first obtained based on the target recorded data. Then, based on the phase current amplitude and phase of each second fault indicator after the fault moment, any two or three second fault indicators with the same phase current amplitude and phase are selected as short-circuit fault indicators. Finally, based on the third line topology, the line section between the short-circuit fault indicator and the adjacent second fault indicator that has not experienced a short-circuit fault is identified as the short-circuit fault section, and short-circuit fault data is generated. This allows for accurate short-circuit fault identification, further improving the efficiency and accuracy of transmission and distribution line fault diagnosis.

[0110] The above-mentioned obtaining the phase current amplitude and phase of each second fault indicator after the fault moment according to the target recorded data refers to obtaining the phase current amplitude and phase of each second fault indicator after the fault moment according to the recorded file.

[0111] The above-mentioned selection of any two-phase or three-phase second fault indicators with the same phase current amplitude and phase as the short-circuit fault indicator based on the phase current amplitude and phase of each second fault indicator after the fault moment refers to analyzing the phase current amplitude and phase of the second fault indicator after the fault moment. If the two-phase current amplitude and phase of a second fault indicator are the same, a short-circuit fault has occurred in the two phases; if the three-phase current amplitude and phase are the same, a short-circuit fault has occurred in the three phases.

[0112] The above-mentioned method of determining the line section between the short-circuit fault indicator and the adjacent second fault indicator that has not experienced a short-circuit fault as the short-circuit fault section according to the third line topology diagram refers to selecting two adjacent second fault indicators, one of which has experienced a short-circuit fault and the other has not experienced a short-circuit fault, and determining that the section between the two is the short-circuit fault section.

[0113] In some embodiments, the fault data includes disconnection fault data, and performing fault analysis based on the third line topology map and the target waveform data to obtain the fault data may include:

[0114] Acquire the phase current and phase electric field of each second fault indicator after the fault moment according to the target recorded data;

[0115] According to the phase current and electric field of each second fault indicator after the fault moment, a second fault indicator with zero phase current and zero phase electric field amplitude is selected as a line break fault indicator;

[0116] According to the third line topology diagram, a line section between the line break fault indicator and an adjacent second fault indicator where no line break fault occurs is used as a line break fault section and line break fault data is generated.

[0117] In this implementation, the phase current and phase electric field of each second fault indicator after the fault moment are first acquired based on the target recorded data. Secondary fault indicators with zero phase current and phase electric field amplitudes are then selected as line-break fault indicators based on the phase current and electric field of each second fault indicator after the fault moment. Finally, based on the third line topology, the line section between the line-break fault indicator and an adjacent second fault indicator that has not experienced a line-break fault is identified as the line-break fault section, and line-break fault data is generated. This allows for accurate line-break fault identification, further improving the efficiency and accuracy of transmission and distribution line fault diagnosis.

[0118] The above-mentioned obtaining the phase current and phase electric field of each second fault indicator after the fault moment according to the target recorded data refers to obtaining the phase current and phase electric field of each second fault indicator after the fault moment according to the recorded file.

[0119] The above-mentioned selecting, based on the phase current and electric field of each second fault indicator after the fault moment, a second fault indicator having a phase current and phase electric field amplitude of zero as a line break fault indicator means analyzing the phase current and electric field after the fault moment, and if the phase current and phase electric field amplitude of a second fault indicator decrease to zero, then determining that the second fault indicator is disconnected from the operating grid and serving as the second fault indicator.

[0120] The above-mentioned method of determining the line section between the line break fault indicator and the adjacent second fault indicator that has not experienced the line break fault as the line break fault section according to the third line topology diagram refers to selecting two adjacent second fault indicators, one of which is disconnected and the other is not disconnected, and determining that the section between the two is the line break fault section.

[0121] refer to Figure 2 , the following describes in detail several specific examples of hierarchical reconstruction and fault judgment in the power transmission and distribution lines of the present application with reference to the accompanying drawings. Specifically, in the first line topology diagram of a certain power transmission and distribution line, three levels of fault indicators are included. The first level fault indicators include F001 and F002, the second level fault indicators include F011 and F012, and the third level fault indicators include F021, F022, and F023.

[0122] Example 1, reference Figure 3 As shown in the figure, when a line fault occurs, before the master server detects the fault, the current and electric field of the fault indicators F001 and F002 are both zero, then F001 and F002 are excluded from the hierarchical relationship, and the other fault indicators are renumbered to generate a reconstructed line topology diagram to complete the fault analysis.

[0123] Example 2, reference Figure 4As shown in the figure, when a line fault occurs, before the fault is detected, the current and electric field of the fault indicators F001, F002, F011 and F012 are all zero, then F001, F002, F011 and F012 are excluded from the hierarchical relationship, and the other fault indicators are renumbered to generate a reconstructed line topology diagram to complete the fault analysis.

[0124] Example 3, reference Figure 5 As shown, a short circuit occurs on a line. If the current and electric field of fault indicators F001 and F002 are both zero before the fault is detected, F001 and F002 are removed from the hierarchy, and the other fault indicators are renumbered to generate a reconstructed line topology. Further analysis of the phase current amplitude and phase of each fault indicator after the fault occurs determines whether a short circuit has occurred. If N001 and N011 experience a short circuit, but N010, N012, and N013 do not, the short circuit fault point is determined to be between the upstream stage N011 and the downstream stage N012.

[0125] Example 4, reference Figure 6 As shown in the figure, a line disconnection occurs. Before the fault is detected, the current and electric field of fault indicators F001, F002, F011, and F012 are all zero. F001, F002, F011, and F012 are then excluded from the hierarchical relationship, and the other fault indicators are renumbered to generate a reconstructed line topology. Further analysis of the phase current amplitude and phase of each fault indicator after the fault occurs determines whether each fault indicator is disconnected. If M001 is not disconnected, but M002 and M003 are, the disconnection fault point is determined to be between the preceding stage M001 and the subsequent stage M002.

[0126] In summary, this application uses dynamic topology reconstruction to analyze and judge transmission and distribution line faults. It collects the current and electric field of each fault indicator in real time. When a line fault occurs, it determines the new front-end and back-end hierarchical relationship based on the fault indicator current and electric field, realizes dynamic topology reconstruction, and completes the fault analysis in the reconstructed topology. Before analyzing and judging the fault, this application dynamically reconstructs the line topology and generates a line topology map that conforms to the actual operating grid. It eliminates invalid data and retains valid fault judgment data, thereby improving the efficiency and accuracy of fault analysis.

[0127] The present application also relates to a power transmission and distribution line monitoring system, comprising a master station and a plurality of fault indicators distributed on the power transmission and distribution line. The master station is communicatively connected to the fault indicator, and the master station performs fault judgment through the power transmission and distribution line fault judgment method based on topology dynamic reconstruction of the above-mentioned embodiment.

[0128] Based on the power transmission and distribution line monitoring method provided in the above embodiment, the present application also provides a specific implementation of the power transmission and distribution line monitoring device.

[0129] like Figure 7 As shown, the power transmission and distribution line monitoring device 200 provided in the embodiment of the present application may include:

[0130] A first topology generating module 201 is configured to obtain a first line topology diagram of a power transmission and distribution line, wherein the first line topology diagram is configured to indicate initial numbers and initial levels of all fault indicators of the power transmission and distribution line;

[0131] A monitoring data acquisition module 202 is configured to identify a first fault indicator based on monitoring data obtained before a fault occurs, wherein the monitoring data is current and electric field data of all fault indicators, and the first fault indicator is a fault indicator indicating zero current and zero electric field;

[0132] The second topology generating module 203 is configured to remove the first fault indicator from the first line topology map to obtain a second line topology map;

[0133] A topology reconstruction module 204 is configured to reconstruct the second line topology map based on the current of the second fault indicator, reconstruct the numbers and previous and next hierarchical relationships of the remaining fault indicators, and obtain a third line topology map. The third line topology map is configured to indicate the current numbers, current hierarchies, and location information of the remaining fault indicators. The second fault indicators are all fault indicators other than the first fault indicator.

[0134] The waveform data acquisition module 205 is used to acquire target waveform data, where the target waveform data is the waveform data of the second fault indicator after the fault occurs.

[0135] The fault analysis module 206 is configured to perform fault analysis based on the third line topology diagram and the target recorded wave data to obtain fault data, where the fault data is used to indicate the fault type and fault location.

[0136] Figure 8 A schematic diagram of the hardware structure of an electronic device provided in an embodiment of the present application is shown.

[0137] The electronic device may include a processor 301 and a memory 302 storing computer program instructions.

[0138] Specifically, the processor 301 may include a central processing unit (CPU), or an application-specific integrated circuit (ASIC), or may be configured to implement one or more integrated circuits of the embodiments of the present application.

[0139] The memory 302 may include a large capacity memory for data or instructions. By way of example and not limitation, the memory 302 may include a hard disk drive (HDD), a floppy disk drive, a flash memory, an optical disk, a magneto-optical disk, a magnetic tape, or a universal serial bus (USB) drive, or a combination of two or more of these. Where appropriate, the memory 302 may include removable or non-removable (or fixed) media. Where appropriate, the memory 302 may be inside or outside the integrated gateway disaster recovery device. In a specific embodiment, the memory 302 is a non-volatile solid-state memory.

[0140] In some embodiments, the memory 302 may include read-only memory (ROM), random access memory (RAM), magnetic disk storage media devices, optical storage media devices, flash memory devices, electrical, optical, or other physical / tangible memory storage devices. Thus, generally, the memory includes one or more tangible (non-transitory) computer-readable storage media (e.g., memory devices) encoded with software including computer-executable instructions, and when the software is executed (e.g., by one or more processors), it is operable to perform the operations described with reference to the method according to an aspect of the present disclosure.

[0141] The processor 301 reads and executes computer program instructions stored in the memory 302 to implement any one of the power transmission and distribution line fault determination methods based on dynamic topology reconstruction in the above embodiments.

[0142] In one example, the electronic device may further include a communication interface 303 and a bus 310. Figure 3 As shown, the processor 301 , the memory 302 , and the communication interface 303 are connected via a bus 310 and communicate with each other.

[0143] The communication interface 303 is mainly used to implement communication between various modules, devices, units and / or equipment in the embodiments of the present application.

[0144] Bus 310 includes hardware, software or both, and the components of online data flow metering equipment are coupled to each other. For example, but not limitation, bus can include accelerated graphics port (AGP) or other graphics bus, enhanced industry standard architecture (EISA) bus, front side bus (FSB), hypertransport (HT) interconnection, industry standard architecture (ISA) bus, infinite bandwidth interconnection, low pin count (LPC) bus, memory bus, micro channel architecture (MCA) bus, peripheral component interconnection (PCI) bus, PCI-Express (PCI-X) bus, serial advanced technology attachment (SATA) bus, video electronics standard association local (VLB) bus or other suitable bus or two or more of these combinations. In appropriate cases, bus 310 can include one or more buses. Although the present application embodiment describes and shows specific bus, the application considers any suitable bus or interconnection.

[0145] In addition, in conjunction with the power transmission and distribution line fault diagnosis method based on dynamic topology reconstruction in the above-mentioned embodiments, embodiments of the present application may provide a computer storage medium for implementation. The computer storage medium stores computer program instructions; when the computer program instructions are executed by a processor, any of the power transmission and distribution line fault diagnosis methods based on dynamic topology reconstruction in the above-mentioned embodiments is implemented.

[0146] It should be understood that the present application is not limited to the specific configurations and processes described above and illustrated in the figures. For the sake of brevity, a detailed description of known methods is omitted here. In the above embodiments, several specific steps are described and illustrated as examples. However, the method process of the present application is not limited to the specific steps described and illustrated. Those skilled in the art can make various changes, modifications, and additions, or change the order of the steps after understanding the spirit of the present application.

[0147] The functional blocks shown in the above-described block diagram can be implemented as hardware, software, firmware or a combination thereof. When implemented in hardware, they can be, for example, electronic circuits, application specific integrated circuits (ASICs), appropriate firmware, plug-ins, function cards, etc. When implemented in software, the elements of the present application are programs or code segments that are used to perform the required tasks. The program or code segment can be stored in a machine-readable medium, or transmitted on a transmission medium or a communication link by a data signal carried in a carrier wave. "Machine-readable medium" can include any medium that can store or transmit information. Examples of machine-readable media include electronic circuits, semiconductor memory devices, ROMs, flash memories, erasable ROMs (EROMs), floppy disks, CD-ROMs, optical disks, hard disks, optical fiber media, radio frequency (RF) links, etc. The code segment can be downloaded via a computer network such as the Internet, an intranet, etc.

[0148] It should also be noted that the exemplary embodiments mentioned in this application describe some methods or systems based on a series of steps or devices. However, this application is not limited to the order of the above steps. In other words, the steps can be performed in the order mentioned in the embodiments, or in a different order, or several steps can be performed simultaneously.

[0149] Aspects of the present disclosure have been described above 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 disclosure. It should be understood that each box in the flowchart and / or block diagram and the combination of each box 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 or other programmable data processing device to produce a machine so that these instructions executed by the processor of the computer or other programmable data processing device enable the implementation of the function / action specified in one or more boxes of the flowchart and / or block diagram. Such a processor can be, but is not limited to, a general-purpose processor, a special-purpose processor, a special application processor or a field programmable logic circuit. It is also understood that each box in the block diagram and / or flowchart and the combination of the boxes in the block diagram and / or flowchart can also be implemented by dedicated hardware that performs the specified function or action, or can be implemented by a combination of dedicated hardware and computer instructions.

[0150] The above description is only a specific embodiment of the present application. Those skilled in the art will clearly understand that for the convenience and brevity of description, the specific working processes of the systems, modules and units described above can refer to the corresponding processes in the aforementioned method embodiments, and will not be repeated here. It should be understood that the scope of protection of the present application is not limited thereto. Any person skilled in the art can easily think of various equivalent modifications or replacements within the technical scope disclosed in the present application, and these modifications or replacements should be included in the scope of protection of the present application.

Claims

1. A method for determining power transmission and distribution line faults based on dynamic topology reconstruction, applied to a server, characterized in that: The following steps are involved: Acquire a first line topology map of the transmission and distribution line, where the first line topology map is used to indicate initial numbers and initial levels of all fault indicators of the transmission and distribution line; Identifying a first fault indicator based on monitoring data before the fault occurs, wherein the monitoring data is current and electric field data of all fault indicators, and the first fault indicator is used to indicate a fault indicator with zero current and zero electric field; Eliminate the first fault indicator from the first line topology diagram to obtain a second line topology diagram; Reconstructing the second line topology map according to the current magnitude of the second fault indicator, reconstructing the numbers and previous and next hierarchical relationships of the remaining fault indicators, and obtaining a third line topology map, wherein the third line topology map is used to indicate the current numbers and current hierarchical levels of the remaining fault indicators, and the second fault indicators are the fault indicators other than the first fault indicator among all the fault indicators; Acquiring target recorded wave data, wherein the target recorded wave data is recorded wave data of the second fault indicator after the fault occurs; A fault analysis is performed based on the third line topology diagram and the target recorded wave data to obtain fault data, where the fault data is used to indicate the fault type and the fault location.

2. The method for determining power transmission and distribution line faults based on dynamic topology reconstruction according to claim 1, characterized in that: Before obtaining the initial line topology data of the transmission and distribution line, the method further includes: Obtain the grid diagram of transmission and distribution lines; According to the grid diagram, all fault indicators in the transmission and distribution lines are numbered and assigned to levels to obtain a first line topology diagram.

3. The method for determining power transmission and distribution line faults based on dynamic topology reconstruction according to claim 1, characterized in that: The first line topology map also includes location information of the fault indicators. The method of numbering and hierarchically assigning all fault indicators in the transmission and distribution lines according to the grid diagram of the transmission and distribution lines to obtain the first line topology map includes: Obtain the location information of the tower according to the grid diagram; Bind each fault indicator to the nearest tower, and generate the position information of the fault indicator according to the position information of the tower; According to the grid diagram of the power transmission and distribution line, all fault indicators in the power transmission and distribution line are numbered and assigned to levels to obtain initial numbers and initial levels of all fault indicators; A first line topology map is obtained according to the initial numbers and initial levels of all fault indicators and the position information of the fault indicators.

4. The method for determining power transmission and distribution line faults based on dynamic topology reconstruction according to claim 1, characterized in that: The fault data includes ground fault data, and the fault analysis is performed based on the third line topology diagram and the target recorded waveform data to obtain the fault data, including: Acquire the zero-sequence current of each second fault indicator after the fault moment according to the target recorded data; According to the magnitude and polarity of the zero-sequence current of each second fault indicator after the fault moment, two adjacent second fault indicators with the largest and second largest zero-sequence current values ​​and opposite polarities are selected as ground fault indicators; According to the third line topology diagram, the line section between the two second target fault indicators is used as a ground fault section and ground fault data is generated.

5. The method for determining power transmission and distribution line faults based on dynamic topology reconstruction according to claim 1, characterized in that: The fault data includes short-circuit fault data, and the fault analysis is performed based on the third line topology diagram and the target recorded waveform data to obtain the fault data, including: Acquire the phase current amplitude and phase of each second fault indicator after the fault moment according to the target recorded data; According to the phase current amplitudes and phases of the respective second fault indicators after the fault moment, second fault indicators with the same phase current amplitudes and phases of any two or three phases are selected as short-circuit fault indicators; According to the third line topology diagram, a line section between the short-circuit fault indicator and an adjacent second fault indicator where no short-circuit fault occurs is used as a short-circuit fault section and short-circuit fault data is generated.

6. The method for determining power transmission and distribution line faults based on dynamic topology reconstruction according to claim 1, characterized in that: The fault data includes disconnection fault data, and the fault analysis is performed based on the third line topology diagram and the target recorded waveform data to obtain the fault data, including: Acquire the phase current and phase electric field of each second fault indicator after the fault moment according to the target recorded data; According to the phase current and electric field of each second fault indicator after the fault moment, a second fault indicator with zero phase current and zero phase electric field amplitude is selected as a line break fault indicator; According to the third line topology diagram, a line section between the line break fault indicator and an adjacent second fault indicator where no line break fault occurs is used as a line break fault section and line break fault data is generated.

7. A power transmission and distribution line monitoring system, characterized in that: It includes a master station and multiple fault indicators distributed on the transmission and distribution lines, the master station is communicatively connected to the fault indicators, and the master station performs fault judgment through the transmission and distribution line fault judgment method based on topology dynamic reconstruction according to any one of claims 1 to 6.

8. A power transmission and distribution line fault judgment device, characterized in that: include: A first topology generating module is configured to obtain a first line topology diagram of a power transmission and distribution line, wherein the first line topology diagram is configured to indicate initial numbers and initial levels of all fault indicators of the power transmission and distribution line; a monitoring data acquisition module, configured to identify a first fault indicator based on monitoring data obtained before a fault occurs, wherein the monitoring data is current and electric field data of all fault indicators, and the first fault indicator is configured to indicate a fault indicator having zero current and zero electric field; A second topology generating module is configured to remove the first fault indicator from the first line topology map to obtain a second line topology map; a topology reconstruction module, configured to reconstruct the second line topology map according to the current magnitude of the second fault indicator, reconstruct the numbers and previous and next hierarchical relationships of the remaining fault indicators, and obtain a third line topology map, wherein the third line topology map is used to indicate the current numbers, current hierarchies, and location information of the remaining fault indicators, wherein the second fault indicators are all fault indicators other than the first fault indicator; A wave recording data acquisition module is used to acquire target wave recording data, wherein the target wave recording data is the wave recording data of the second fault indicator after the fault occurs; The fault analysis module is used to perform fault analysis based on the third line topology diagram and the target recorded wave data to obtain fault data, where the fault data is used to indicate the fault type and fault location.

9. An electronic device, characterized in that: The device includes: a processor and a memory storing computer program instructions; When the processor executes the computer program instructions, it implements the method for determining power transmission and distribution line faults based on dynamic topology reconstruction according to any one of claims 1 to 6.

10. A computer-readable storage medium, characterized in that The computer-readable storage medium stores computer program instructions, which, when executed by a processor, implement the method for determining power transmission and distribution line faults based on dynamic topology reconstruction according to any one of claims 1 to 6.

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