Methods, systems, devices, equipment, and media for fault diagnosis of power transmission and distribution lines based on topology dynamic reconfiguration.

Abstract

This application discloses a method, system, device, equipment, and medium for fault diagnosis of transmission and distribution lines based on dynamic topology reconstruction. The method includes: acquiring a first line topology map of the transmission and distribution line; identifying a first fault indicator based on monitoring data before the fault occurred; removing the first fault indicator from the first line topology map to obtain a second line topology map; reconstructing the second line topology map based on the current magnitude of the second fault indicator; reconstructing the numbering and hierarchical relationship of the remaining fault indicators to obtain a third line topology map; acquiring target waveform recording data; and performing fault analysis based on the third line topology map and the target waveform recording data to obtain fault data. This application can improve the efficiency and accuracy of fault diagnosis of transmission and distribution lines.

Description

Technical Field

[0001] This application relates to the field of power transmission and distribution line monitoring, and in particular to a method, system, device, equipment and medium for judging power transmission and distribution line faults based on topology dynamic reconstruction. Background Technology

[0002] As electricity accounts for a growing proportion of final energy consumption, electricity users have increasingly higher requirements for power supply reliability. Therefore, transmission and distribution lines should have greater resilience and be able to quickly locate, eliminate, and restore power supply when a line fault occurs.

[0003] However, the grid structure of power transmission and distribution lines is vast and complex, and its operation frequently 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 incompatible with the flexible and ever-changing nature of power transmission and distribution network operations, not only incorporating invalid information but also resulting in low efficiency and inaccurate assessment results. Summary of the Invention

[0004] This application aims to propose a method, system, device, equipment, and medium for fault diagnosis of power transmission and distribution lines based on topology dynamic reconfiguration, which can improve the efficiency and accuracy of fault diagnosis of power transmission and distribution lines.

[0005] In a first aspect, embodiments of this application provide a method for determining faults in power transmission and distribution lines based on dynamic topology reconfiguration, applied to a server, comprising the following steps:

[0006] Obtain a first line topology map of the power transmission and distribution line, which is used to indicate the initial number, initial level and location information of all fault indicators of the power transmission and distribution line;

[0007] Based on the monitoring data prior to the fault occurrence, a first fault indicator is identified. The monitoring data consists of the current and electric field data of all fault indicators. The first fault indicator is used to indicate fault indicators where the current and electric field are zero.

[0008] Remove the first fault indicator from the first route topology map to obtain the second route topology map;

[0009] The second line topology is reconstructed based on the current magnitude of the second fault indicator. The numbering and hierarchical relationship of the remaining fault indicators are reconstructed to obtain the third line topology. The third line topology is used to indicate the current number, current level and location information of the remaining fault indicators. The second fault indicator is any fault indicator other than the first fault indicator among all fault indicators.

[0010] Acquire target waveform data, wherein the target waveform data is the waveform data of the second fault indicator after the fault occurs;

[0011] Fault analysis is performed based on the third line topology diagram and target waveform data to obtain fault data, which is used to indicate the fault type and fault location.

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

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

[0014] Based on the network diagram, all fault indicators in the transmission and distribution lines are numbered and assigned hierarchical levels to obtain the first line topology diagram.

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

[0016] Obtain the location information of the towers based on the grid diagram;

[0017] Each fault indicator is bound to the nearest pole, and the location information of the fault indicator is generated based on the location information of the pole.

[0018] According to the network diagram of the power transmission and distribution lines, all fault indicators in the power transmission and distribution lines are numbered and assigned hierarchical levels to obtain the initial number and initial level of all fault indicators.

[0019] Based on the initial number and initial level of all fault indicators, as well as the location information of the fault indicators, the first line topology map is obtained.

[0020] According to some embodiments of this application, the fault data includes ground fault data, and the step of obtaining fault data by performing fault analysis based on the third line topology diagram and target waveform data includes:

[0021] The zero-sequence current of each second fault indicator after the fault time is obtained based on the target waveform data.

[0022] Based on the magnitude and polarity of the zero-sequence current of each second fault indicator after the fault time, select the two adjacent second fault indicators with the largest and second largest zero-sequence current values ​​and opposite polarities as ground fault indicators.

[0023] Based on the third line topology diagram, the line section between the two first target fault indicators is taken as the ground fault section and ground fault data is generated.

[0024] According to some embodiments of this application, the fault data includes short-circuit fault data, and the step of obtaining fault data by performing fault analysis based on the third line topology diagram and target waveform recording data includes:

[0025] Based on the target waveform data, obtain the phase current amplitude and phase of each second fault indicator after the fault time;

[0026] Based on the phase current amplitude and phase of each second fault indicator after the fault time, select any two or three phases with the same phase current amplitude and phase as the short-circuit fault indicator.

[0027] Based on the third line topology diagram, the line segment between the short-circuit fault indicator and the adjacent second fault indicator that has not experienced a short-circuit fault is designated as the short-circuit fault segment, and short-circuit fault data is generated.

[0028] According to some embodiments of this application, the fault data includes disconnection fault data, and the step of obtaining fault data by performing fault analysis based on the third line topology diagram and target waveform data includes:

[0029] Based on the target waveform data, obtain the phase current and phase electric field of each second fault indicator after the fault time;

[0030] Based on the phase current and electric field of each second fault indicator after the fault time, the second fault indicator with zero phase current and phase electric field amplitude is selected as the open circuit fault indicator.

[0031] Based on the third line topology diagram, the line segment between the open circuit fault indicator and the adjacent second fault indicator that has not experienced an open circuit fault is designated as the open circuit fault segment, and open circuit fault data is generated.

[0032] Secondly, embodiments of this application provide a power transmission and distribution line monitoring system, including a master station and multiple fault indicators distributed on the power transmission and distribution lines. The master station is communicatively connected to the fault indicators, and the master station performs fault judgment using the power transmission and distribution line fault judgment method based on topology dynamic reconstruction described in the first aspect.

[0033] Thirdly, embodiments of this application provide a fault detection device for power transmission and distribution lines, comprising:

[0034] The first topology generation module is used to obtain the first line topology map of the transmission and distribution line, which is used to indicate the initial number and initial level of all fault indicators of the transmission and distribution line.

[0035] The monitoring data acquisition module is used to identify the first fault indicator based on the monitoring data before the fault occurs. The monitoring data includes the current and electric field data of all fault indicators. The first fault indicator is used to indicate the fault indicator where the current and electric field are zero.

[0036] The second topology generation module is used to remove the first fault indicator from the first line topology map to obtain the second line topology map.

[0037] The topology reconstruction module is used to reconstruct the second line topology based on the current magnitude of the second fault indicator, reconstruct the numbering and hierarchical relationship of the remaining fault indicators, and obtain a third line topology. The third line topology is used to indicate the current number and current level of the remaining fault indicators. The second fault indicator is any fault indicator other than the first fault indicator among all fault indicators.

[0038] The waveform data acquisition module is used to acquire target waveform data, which is the waveform data of the second fault indicator after the fault occurred.

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

[0040] Fourthly, embodiments of this application provide an electronic device, the device comprising: a processor and a memory storing computer program instructions;

[0041] When the processor executes the computer program instructions, it implements the power transmission and distribution line fault judgment method based on topology dynamic reconfiguration as described in the first aspect.

[0042] Fifthly, embodiments of this application provide a computer-readable storage medium storing computer program instructions, which, when executed by a processor, implement the power transmission and distribution line fault judgment method based on topology dynamic reconfiguration as described in the first aspect.

[0043] The method, system, device, equipment, and medium for determining transmission and distribution line faults based on topology dynamic reconfiguration in this application have at least the following beneficial effects:

[0044] In this embodiment, a first line topology map of the transmission and distribution line is first obtained. Then, based on monitoring data prior to the fault occurrence, a first fault indicator is identified. Next, the first fault indicator is removed from the first line topology map to obtain a second line topology map. Then, the second line topology map is reconstructed based on the current magnitude of the second fault indicator, reconstructing the remaining fault indicator numbers and their hierarchical relationships to obtain a third line topology map. Finally, target waveform recording data is acquired, and fault analysis is performed based on the third line topology map and the target waveform recording data to obtain fault data. This application improves the efficiency and accuracy of transmission and distribution line fault diagnosis by removing invalid fault indicators based on monitoring data prior to the fault occurrence and performing fault judgment based on the reconstructed line topology.

[0045] Additional aspects and advantages of this application will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of this application. Attached Figure Description

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

[0047] Figure 1 A flowchart illustrating an embodiment of the power transmission and distribution line fault judgment method based on topology dynamic reconfiguration provided in this application;

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

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

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

[0051] Figure 5 This is an example diagram of the line topology for determining short-circuit faults in this application;

[0052] Figure 6 This is an example diagram illustrating the line topology for determining line faults in this application.

[0053] Figure 7 A schematic diagram of the structure of the power transmission and distribution line fault detection device provided in this application;

[0054] Figure 8 A schematic diagram of the structure of the electronic device provided in this application. Detailed Implementation

[0055] The features and exemplary embodiments of various aspects of this application will be described in detail below. To make the objectives, technical solutions, and advantages of this application clearer, the application will be further described in detail below with reference to the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described herein are only intended to explain this application and not to limit it. For those skilled in the art, this application can be implemented without some of these specific details. The following description of the embodiments is merely to provide a better understanding of this application by illustrating examples.

[0056] In this document, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, without necessarily requiring or implying any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising..." does not exclude the presence of additional identical elements in the process, method, article, or apparatus that includes said element.

[0057] As electricity accounts for a growing proportion of final energy consumption, electricity users have increasingly higher requirements for power supply reliability. Therefore, transmission and distribution lines should have greater resilience and be able to quickly locate, eliminate, and restore power supply when a line fault occurs.

[0058] However, the grid structure of power transmission and distribution lines is vast and complex, and its operation frequently 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 incompatible with the flexible and ever-changing nature of power transmission and distribution network operations, not only incorporating invalid information but also resulting in low efficiency and inaccurate assessment results.

[0059] To address the problems of existing technologies, embodiments of this application provide a method, system, device, equipment, and medium for determining transmission and distribution line faults based on dynamic topology reconfiguration. The method for determining transmission and distribution line faults based on dynamic topology reconfiguration provided in this application will be described first below.

[0060] Figure 1 This illustration shows a flowchart of a power transmission and distribution line fault diagnosis method based on dynamic topology reconfiguration provided in an embodiment of this application. The method is applied to a server, which can be located in the cloud or in a dedicated local data center.

[0061] A method for fault diagnosis of power transmission and distribution lines based on dynamic topology reconfiguration, applied to a server, includes the following steps:

[0062] S101. Obtain the first line topology diagram of the transmission and distribution line. The first line topology diagram is used to indicate the initial number and initial level of all fault indicators of the transmission and distribution line.

[0063] S102. Based on the monitoring data before the fault occurred, identify the first fault indicator. The monitoring data consists of the current and electric field data of all fault indicators. The first fault indicator is used to indicate the fault indicator where the current and electric field are zero.

[0064] S103. Remove the first fault indicator from the first line topology diagram to obtain the second line topology diagram;

[0065] S104. Reconstruct the second line topology based on the current magnitude of the second fault indicator, reconstruct the numbering and hierarchical relationship of the remaining fault indicators, and obtain the third line topology. The third line topology is used to indicate the current number and current level of the remaining fault indicators. The second fault indicator is any fault indicator other than the first fault indicator among all fault indicators.

[0066] S105. Obtain the target waveform data, which is the waveform data of the second fault indicator after the fault occurred.

[0067] S106. Based on the third line topology diagram and target waveform data, perform fault analysis to obtain fault data. The fault data is used to indicate the fault type and fault location.

[0068] In this embodiment, a first line topology map of the transmission and distribution line is first obtained. Then, based on monitoring data prior to the fault occurrence, a first fault indicator is identified. Next, the first fault indicator is removed from the first line topology map to obtain a second line topology map. Then, the second line topology map is reconstructed based on the current magnitude of the second fault indicator, reconstructing the remaining fault indicator numbers and their hierarchical relationships to obtain a third line topology map. Finally, target waveform recording data is acquired, and fault analysis is performed based on the third line topology map and the target waveform recording data to obtain fault data. This application improves the efficiency and accuracy of transmission and distribution line fault diagnosis by removing invalid fault indicators based on monitoring data prior to the fault occurrence and performing fault judgment based on the reconstructed line topology.

[0069] The first line topology diagram in step S101 above refers to the initial line topology diagram of the entire transmission and distribution line. The initial line topology diagram records all the 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 diagram can also include information on all power substations, main and branch line important towers and other transmission and distribution line information.

[0070] It should be noted that fault diagnosis requires analyzing and locating fault zones based on hierarchical levels. Therefore, fault indicators need to be hierarchically assigned, and their numbers indicate the sequential relationship between them. The initial numbers and initial levels of the fault indicators in the first line topology diagram are obtained by numbering and hierarchically assigning all fault indicators on the transmission and distribution lines. For example, in this embodiment, the one closest to the power source is designated as level 0. Moving towards the load, the level increases by 1 for each branch encountered, and indicators at the same level are distinguished by their numbers. In addition to its own number, each fault indicator also retains the numbers of the preceding and following fault indicators, thus forming a hierarchical relationship between preceding and following levels.

[0071] The first line topology map can be obtained by directly calling or querying existing line topology maps, or by constructing a line topology map that includes power substations, main and branch line important towers, and fault indicators based on the power transmission and distribution line network diagram.

[0072] The step S102 above, which identifies the first fault indicator based on the monitoring data before the fault occurred, refers to finding the fault indicator where the current and electric field are zero based on the monitoring data.

[0073] Since the fault indicator collects the 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 occurred and use the fault indicator with zero current and electric field as the first fault indicator.

[0074] In step S103 above, removing the first fault indicator from the first line topology diagram to obtain the second line topology diagram means removing the first fault indicator from the first line topology diagram, which is equivalent to removing the corresponding line section of the first fault indicator. Since 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 occurred before the fault occurred, the data of this part of the fault indicator is invalid data for fault analysis. Removing it can improve the efficiency of fault information.

[0075] It should be understood that the second line topology diagram is the first line topology diagram after removing the first fault indicator of the non-energized section. At this time, the numbering and level of the remaining fault indicators are still the initial numbering and initial level.

[0076] In step S104 above, the second line topology is reconstructed based on the current magnitude of the second fault indicator, and the numbering and hierarchical relationship of the remaining fault indicators are reconstructed to obtain the third line topology. This refers to 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 is a line topology that eliminates the first fault indicator and reconstructs the hierarchical relationship and numbering. The third line topology reflects the true line topology of the transmission and distribution lines before the fault occurred, eliminating invalid information.

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

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

[0079] The second fault indicator with the highest current is designated as layer 0;

[0080] Based on the second fault indicator of layer 0 and the second line topology diagram, new layers are constructed sequentially according to the current magnitude. The current of the preceding fault indicator is greater than or equal to that of the following fault indicator. The layer of the remaining fault indicators is determined according to the current magnitude and the pre-set preceding and following layers. The fault indicators are numbered according to the new layer and the preceding and following layer relationship. Different fault indicators in the same layer are numbered according to the preceding and following position order to obtain the third line topology diagram.

[0081] In step S105 above, obtaining the target waveform data refers to the second fault indicator monitoring the fault event in real time and generating a waveform file, and transmitting the waveform file to the main station server. The main station can obtain the target waveform data through the waveform file.

[0082] In step S106 above, fault analysis is performed based on the third line topology diagram and target waveform data to obtain fault data. This means that, based on the hierarchical relationship before and after reconstruction, the waveform files of all second fault indicators in the third line topology diagram are analyzed layer by layer starting from the new level 0 to extract fault criteria and complete fault assessment and location.

[0083] Specifically, the location of fault indicators can be determined by pre-setting the nearest tower on the topology map as the actual geographical location of the fault indicator, or by marking the actual geographical location of each fault indicator with latitude and longitude.

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

[0085] In some implementations, prior to obtaining the initial line topology data of the transmission and distribution lines, the process may further include:

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

[0087] Based on the network diagram, all fault indicators in the transmission and distribution lines are numbered and assigned hierarchical levels to obtain the first line topology diagram.

[0088] In this embodiment, the network diagram of the transmission and distribution lines is first obtained; then, based on the network diagram, all fault indicators in the transmission and distribution lines are numbered and hierarchically assigned 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 power transmission and distribution network diagram refers to the topology of power transmission and distribution lines excluding the numbering and hierarchical allocation of fault indicators. The network diagram can show the path of power from the power source (such as a substation) to the user end, the equipment connection methods, and the division of power supply areas. It includes the physical connection relationships of power source substations, main and branch lines, important towers, and fault indicators.

[0090] The above-mentioned numbering and hierarchical allocation of all fault indicators in transmission and distribution lines based on the network diagram refers to numbering and hierarchically allocating the fault indicators in the line topology diagram, which includes power sources, substations, main and branch lines, important towers, and fault indicators, to obtain the first line topology diagram containing the initial numbers and initial levels of the fault indicators. The method for allocating the hierarchical levels of fault indicators is as follows: Each fault indicator has its own unique number, which includes a level number and a sequence number. The level closest to the power source (substation) is level 0. Moving towards the load, the level number increases by 1 for each line branch encountered. Different fault indicators within the same level are distinguished by their sequence numbers. In addition to its own number, each fault indicator also retains the numbers of its predecessor and successor fault indicators, thus forming a hierarchical relationship between preceding and succeeding levels.

[0091] In some implementations, the first line topology map also includes the location information of fault indicators. Based on the network 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 towers based on the grid diagram;

[0093] Each fault indicator is bound to the nearest pole, and the location information of the fault indicator is generated based on the location information of the pole.

[0094] Based on the network diagram of the power transmission and distribution lines, all fault indicators in the power transmission and distribution lines are numbered and assigned hierarchical levels to obtain the initial number and initial level of all fault indicators.

[0095] Based on the initial number and initial level of all fault indicators, as well as the location information of the fault indicators, the first line topology map is obtained.

[0096] In this embodiment, the location information of the poles and towers is obtained based on the network diagram; each fault indicator is bound to the nearest pole or tower, and the location information of the fault indicator is generated based on the location information of the pole or tower; according to the network diagram of the transmission and distribution line, all fault indicators in the transmission and distribution line are numbered and assigned a hierarchy, obtaining the initial number and initial hierarchy of all fault indicators; based on the initial number and initial hierarchy of all fault indicators, as well as the location information of the fault indicators, a first line topology diagram is obtained. Binding fault indicators to the nearest pole or tower and generating the location information of the fault indicators in the first line topology diagram can further improve the accuracy of fault location.

[0097] Because the numbering and hierarchy of fault indicators can change dynamically, it's impossible to determine their exact location based solely on the number or hierarchy. However, the location of the fault is a crucial element in fault diagnosis. Using latitude and longitude to pinpoint the actual geographical location of each fault indicator is cumbersome. Even if the latitude and longitude are known, mapping them to the actual location requires map conversion. Since the location of each tower is marked on the grid diagram, binding the fault indicator to the nearest tower provides a fixed location for the fault indicator, facilitating subsequent fault diagnosis.

[0098] In some implementations, the fault data includes ground fault data. Fault data is obtained by performing fault analysis based on the third line topology diagram and target waveform data, and may include:

[0099] The zero-sequence current of each second fault indicator after the fault time is obtained based on the target waveform data.

[0100] Based on the magnitude and polarity of the zero-sequence current of each second fault indicator after the fault time, select the two adjacent second fault indicators with the largest and second largest zero-sequence current values ​​and opposite polarities as ground fault indicators.

[0101] Based on the third line topology diagram, the line section between the two first target fault indicators is taken as the ground fault section and ground fault data is generated.

[0102] In this embodiment, firstly, the zero-sequence current of each second fault indicator after the fault time is obtained based on the target waveform data. Then, based on the magnitude and polarity of the zero-sequence current of each second fault indicator after the fault time, two adjacent second fault indicators with the largest and second largest zero-sequence currents and opposite polarities are selected as ground fault indicators. Finally, according to the third line topology diagram, the line section between the two first target fault indicators is designated as the ground fault section, and ground fault data is generated. This allows for accurate identification of ground faults, further improving the efficiency and accuracy of fault identification in transmission and distribution lines.

[0103] The aforementioned zero-sequence current of each second fault indicator after the fault time is obtained based on the target waveform data. This refers to obtaining the zero-sequence current of each second fault indicator after the fault time based on the waveform file.

[0104] The above-mentioned selection of two adjacent second fault indicators with the largest and second largest zero-sequence currents and opposite polarities as ground fault indicators, based on the magnitude and polarity of the zero-sequence currents after the fault time, refers to sorting the zero-sequence currents according to their magnitude after the fault time, and then selecting the two adjacent second fault indicators with the largest and second largest zero-sequence currents and opposite polarities as ground fault indicators. The line section between these two ground fault indicators is the ground fault section.

[0105] In some implementations, the fault data includes short-circuit fault data. Fault data is obtained by performing fault analysis based on a third line topology diagram and target waveform recording data, and may include:

[0106] The phase current amplitude and phase of each second fault indicator are obtained after the fault time based on the target waveform data.

[0107] Based on the phase current amplitude and phase of each second fault indicator after the fault time, select any two or three phases with the same phase current amplitude and phase as the short-circuit fault indicator.

[0108] Based on the third line topology diagram, the line segment between the short-circuit fault indicator and the adjacent second fault indicator that has not experienced a short-circuit fault is designated as the short-circuit fault segment, and short-circuit fault data is generated.

[0109] In this embodiment, firstly, the phase current amplitude and phase of each second fault indicator after the fault time are obtained based on the target waveform recording data; then, based on the phase current amplitude and phase of each second fault indicator after the fault time, any two or three phases of second fault indicators with the same phase current amplitude and phase are selected as short-circuit fault indicators; finally, according to the third line topology diagram, the line segment between the short-circuit fault indicator and the adjacent second fault indicator that has not experienced a short-circuit fault is taken as the short-circuit fault segment, and short-circuit fault data is generated. This allows for accurate identification of short-circuit faults, further improving the efficiency and accuracy of fault identification in transmission and distribution lines.

[0110] The aforementioned acquisition of the phase current amplitude and phase of each second fault indicator after the fault time based on the target waveform data refers to the acquisition of the phase current amplitude and phase of each second fault indicator after the fault time based on the waveform file.

[0111] The above-mentioned selection of any two or three phases of the second fault indicator 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 time refers to analyzing the phase current amplitude and phase of the second fault indicator after the fault time. If the phase current amplitude and phase of a certain second fault indicator are the same, then a short-circuit fault has occurred in those two phases. If the phase current amplitude and phase of all three phases are the same, then a short-circuit fault has occurred in all three phases.

[0112] The above-mentioned section of the line between the short-circuit fault indicator and the adjacent second fault indicator that has not experienced a short-circuit fault, as determined by 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, and determining the section between the two as the short-circuit fault section.

[0113] In some implementations, the fault data includes disconnection fault data, obtained by fault analysis based on a third line topology diagram and target waveform data, and may include:

[0114] The phase current and phase electric field of each second fault indicator are obtained after the fault time based on the target waveform data.

[0115] Based on the phase current and electric field of each second fault indicator after the fault time, the second fault indicator with zero phase current and phase electric field amplitude is selected as the open circuit fault indicator.

[0116] Based on the third line topology diagram, the line segment between the open circuit fault indicator and the adjacent second fault indicator that has not experienced an open circuit fault is designated as the open circuit fault segment, and open circuit fault data is generated.

[0117] In this embodiment, firstly, the phase current and phase electric field of each second fault indicator after the fault time are obtained based on the target waveform recording data; then, based on the phase current and electric field of each second fault indicator after the fault time, the second fault indicator with a phase current and phase electric field amplitude of zero is selected as the open circuit fault indicator; finally, according to the third line topology diagram, the line segment between the open circuit fault indicator and the adjacent second fault indicator that has not experienced an open circuit fault is taken as the open circuit fault segment, and open circuit fault data is generated. This allows for accurate identification of open circuit faults, further improving the efficiency and accuracy of fault identification in transmission and distribution lines.

[0118] The aforementioned acquisition of the phase current and phase electric field of each second fault indicator after the fault time based on the target waveform data refers to the acquisition of the phase current and phase electric field of each second fault indicator after the fault time based on the waveform file.

[0119] The above-mentioned selection of the second fault indicator with a phase current and phase electric field amplitude of zero as the open circuit fault indicator based on the phase current and electric field of each second fault indicator after the fault time refers to analyzing the phase current and electric field after the fault time. If the phase current and phase electric field amplitude of a certain second fault indicator decrease to zero, it is determined that the second fault indicator has been disconnected from the operating grid and is used as the second fault indicator.

[0120] The above-mentioned section of the line between the open circuit fault indicator and the adjacent second fault indicator that has not experienced an open circuit fault, as determined by 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 the section between the two as the open circuit fault section.

[0121] refer to Figure 2 The following detailed description, in conjunction with the accompanying drawings, illustrates several specific examples of hierarchical reconfiguration and fault diagnosis in transmission and distribution lines of this application. Specifically, in the first line topology diagram of a certain transmission and distribution line, there are three levels of fault indicators: 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, when a line fault occurs, before the main station server detects the fault, the current and electric field of fault indicators F001 and F002 are both zero. Therefore, F001 and F002 are excluded from the hierarchical relationship, and other fault indicators are renumbered to generate a reconstructed line topology map and complete the fault assessment.

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

[0124] Example 3, Reference Figure 5 As shown, when a short-circuit fault occurs on the line, if the current and electric field of fault indicators F001 and F002 are both zero before the fault is detected, then 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 time is performed to determine whether a short-circuit fault has occurred in each fault indicator. If short-circuit faults occur in N001 and N011, but not in N010, N012, and N013, then the short-circuit fault point is determined to be between the preceding N011 and the following N012.

[0125] Example 4, Reference Figure 6 As shown, a line open circuit fault occurs. Before the fault is detected, the current and electric field of fault indicators F001, F002, F011, and F012 are all zero. Therefore, F001, F002, F011, and F012 are removed 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 disconnected, then the open circuit fault point is determined to be between the preceding M001 and the following M002.

[0126] In summary, this application uses dynamic topology reconstruction for fault assessment of power transmission and distribution lines. It collects the current and electric field data of each fault indicator in real time. When a fault occurs on the line, it determines the new hierarchical relationship based on the fault indicator current and electric field, achieving dynamic topology reconstruction. Fault assessment is then performed within the reconstructed topology. Before fault assessment, this application dynamically reconstructs the line topology, generating a line topology diagram that conforms to the actual operating network structure. Invalid data is eliminated, and valid fault criteria data are retained, improving the efficiency and accuracy of fault assessment.

[0127] This application also relates to a power transmission and distribution line monitoring system, including a master station and multiple fault indicators distributed on the power transmission and distribution lines. The master station is communicatively connected to the fault indicators, and the master station performs fault judgment using the power transmission and distribution line fault judgment method based on topology dynamic reconstruction as described in the above embodiments.

[0128] Based on the power transmission and distribution line monitoring method provided in the above embodiments, this application also provides specific implementation methods 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 this application embodiment may include:

[0130] The first topology generation module 201 is used to obtain the first line topology map of the transmission and distribution line. The first line topology map is used to indicate the initial number and initial level of all fault indicators of the transmission and distribution line.

[0131] The monitoring data acquisition module 202 is used to identify the first fault indicator based on the monitoring data before the fault occurs. The monitoring data includes the current and electric field data of all fault indicators. The first fault indicator is used to indicate the fault indicator where the current and electric field are zero.

[0132] The second topology generation module 203 is used to remove the first fault indicator from the first line topology map to obtain the second line topology map.

[0133] The topology reconstruction module 204 is used to reconstruct the second line topology based on the current magnitude of the second fault indicator, reconstruct the number and hierarchical relationship of the remaining fault indicators, and obtain the third line topology. The third line topology is used to indicate the current number, current level and location information of the remaining fault indicators. The second fault indicator is the other fault indicator besides the first fault indicator among all fault indicators.

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

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

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

[0137] An 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), an application-specific integrated circuit (ASIC), or one or more integrated circuits that can be configured to implement the embodiments of this application.

[0139] Memory 302 may include mass storage for data or instructions. For example, and not limitingly, memory 302 may include a hard disk drive (HDD), floppy disk drive, flash memory, optical disk, magneto-optical disk, magnetic tape, or Universal Serial Bus (USB) drive, or a combination of two or more of these. Where appropriate, memory 302 may include removable or non-removable (or fixed) media. Where appropriate, memory 302 may be internal or external to the integrated gateway disaster recovery device. In a particular embodiment, memory 302 is non-volatile solid-state memory.

[0140] In some embodiments, memory 302 may include read-only memory (ROM), random access memory (RAM), disk storage media device, optical storage media device, flash memory device, electrical, optical, or other physical / tangible memory storage device. Thus, generally, 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 one aspect of this disclosure.

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

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

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

[0144] Bus 310 includes hardware, software, or both, that couples components of an online data traffic metering device together. For example, and not limitingly, the bus may include an Accelerated Graphics Port (AGP) or other graphics bus, an Enhanced Industry Standard Architecture (EISA) bus, a Front Side Bus (FSB), HyperTransport (HT) interconnect, an Industry Standard Architecture (ISA) bus, an Infinite Bandwidth Interconnect, a Low Pin Count (LPC) bus, a memory bus, a Microchannel Architecture (MCA) bus, a Peripheral Component Interconnect (PCI) bus, a PCI-Express (PCI-X) bus, a Serial Advanced Technology Attachment (SATA) bus, a Video Electronics Standards Association Local (VLB) bus, or other suitable buses, or combinations of two or more of these. Where appropriate, bus 310 may include one or more buses. Although specific buses are described and illustrated in embodiments of this application, any suitable bus or interconnect is contemplated herein.

[0145] Furthermore, in conjunction with the power transmission and distribution line fault judgment method based on topology dynamic reconfiguration in the above embodiments, this application embodiment can provide a computer storage medium for implementation. The computer storage medium stores computer program instructions; when these computer program instructions are executed by a processor, they implement any of the power transmission and distribution line fault judgment methods based on topology dynamic reconfiguration in the above embodiments.

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

[0147] The functional blocks shown in the above-described structural 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 this application are programs or code segments used to perform the required tasks. Programs or code segments can be stored on a machine-readable medium or transmitted over a transmission medium or communication link via data signals carried on a carrier wave. "Machine-readable medium" can include any medium capable of storing or transmitting information. Examples of machine-readable media include electronic circuits, semiconductor memory devices, ROM, flash memory, erasable ROM (EROM), floppy disks, CD-ROMs, optical disks, hard disks, fiber optic media, radio frequency (RF) links, etc. Code segments can be downloaded via computer networks such as the Internet, intranets, etc.

[0148] It should also be noted that the exemplary embodiments mentioned in this application describe methods or systems based on a series of steps or apparatus. However, this application is not limited to the order of the above steps; that is, 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] The aspects of this disclosure have been described above with reference to flowchart illustrations and / or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of this disclosure. It should be understood that each block in the flowchart illustrations and / or block diagrams, and combinations of blocks in the flowchart illustrations and / or block diagrams, 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 apparatus to produce a machine such that these instructions, executable via the processor of the computer or other programmable data processing apparatus, enable the implementation of the functions / actions specified in one or more blocks of the flowchart illustrations and / or block diagrams. 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 block in the block diagrams and / or flowcharts, and combinations of blocks in the block diagrams and / or flowcharts, can also be implemented by special-purpose hardware performing the specified functions or actions, or can be implemented by a combination of special-purpose hardware and computer instructions.

[0150] The above description is merely a specific implementation of this application. Those skilled in the art will clearly understand that, for the sake of convenience and brevity, the specific working processes of the systems, modules, and units described above can be referred to the corresponding processes in the foregoing method embodiments, and will not be repeated here. It should be understood that the protection scope of this application is not limited thereto. Any person skilled in the art can easily conceive of various equivalent modifications or substitutions within the technical scope disclosed in this application, and these modifications or substitutions should all be covered within the protection scope of this application.

Claims

1. A method for fault diagnosis of power transmission and distribution lines based on dynamic topology reconfiguration, applied to a server, characterized in that, Includes the following steps: Obtain a first line topology map of the transmission and distribution lines, which is used to indicate the initial number and initial level of all fault indicators of the transmission and distribution lines; Based on the monitoring data prior to the fault occurrence, a first fault indicator is identified. The monitoring data consists of the current and electric field data of all fault indicators. The first fault indicator is used to indicate fault indicators where the current and electric field are zero. Remove the first fault indicator from the first route topology map to obtain the second route topology map; The second line topology is reconstructed based on the current magnitude of the second fault indicator, and the remaining fault indicators' numbers and hierarchical relationships are reconstructed to obtain a third line topology. The specific steps for reconstructing the remaining fault indicator numbers and hierarchical relationships are as follows: Current data for all second fault indicators is obtained from the monitoring data; the second fault indicator with the largest current is designated as layer 0; based on the second fault indicators in layer 0 and the second line topology, new layers are constructed sequentially according to current magnitude, where the current of the preceding fault indicator is greater than or equal to that of the following fault indicator; the remaining fault indicators' layers are dynamically determined based on current magnitude and pre-set hierarchical relationships, and numbered according to the new layers and hierarchical relationships; different fault indicators in the same layer are numbered according to their preceding and following positions to obtain the third line topology. The third line topology is used to indicate the current number and current layer of the remaining fault indicators, where the second fault indicator is any fault indicator other than the first fault indicator among all fault indicators. Acquire target waveform data, wherein the target waveform data is the waveform data of the second fault indicator after the fault occurs; Fault analysis is performed based on the third line topology diagram and target waveform data to obtain fault data, which is used to indicate the fault type and fault location.

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

3. The method for determining transmission and distribution line faults based on dynamic topology reconfiguration according to claim 2, characterized in that, The first line topology map also includes the location information of fault indicators. The step of numbering and hierarchically assigning all fault indicators in the transmission and distribution lines according to the network diagram to obtain the first line topology map includes: Obtain the location information of the towers based on the grid diagram; Each fault indicator is bound to the nearest pole, and the location information of the fault indicator is generated based on the location information of the pole. According to the network diagram of the power transmission and distribution lines, all fault indicators in the power transmission and distribution lines are numbered and assigned hierarchical levels to obtain the initial number and initial level of all fault indicators. Based on the initial number and initial level of all fault indicators, as well as the location information of the fault indicators, the first line topology map is obtained.

4. The method for determining transmission and distribution line faults based on dynamic topology reconfiguration according to claim 1, characterized in that, The fault data includes grounding fault data. The fault analysis based on the third line topology diagram and target waveform data to obtain fault data includes: The zero-sequence current of each second fault indicator after the fault time is obtained based on the target waveform data. Based on the magnitude and polarity of the zero-sequence current of each second fault indicator after the fault time, select the two adjacent second fault indicators with the largest and second largest zero-sequence current values ​​and opposite polarities as ground fault indicators. Based on the third line topology diagram, the line section between the two second target fault indicators is designated as the ground fault section, and ground fault data is generated.

5. The method for determining transmission and distribution line faults based on dynamic topology reconfiguration according to claim 1, characterized in that, The fault data includes short-circuit fault data. The fault analysis based on the third line topology diagram and target waveform data to obtain fault data includes: Based on the target waveform data, obtain the phase current amplitude and phase of each second fault indicator after the fault time; Based on the phase current amplitude and phase of each second fault indicator after the fault time, select any two or three phases with the same phase current amplitude and phase as the short-circuit fault indicator. Based on the third line topology diagram, the line segment between the short-circuit fault indicator and the adjacent second fault indicator that has not experienced a short-circuit fault is designated as the short-circuit fault segment, and short-circuit fault data is generated.

6. The method for determining transmission and distribution line faults based on dynamic topology reconfiguration according to claim 1, characterized in that, The fault data includes disconnection fault data. The fault analysis based on the third line topology diagram and target waveform data to obtain fault data includes: Based on the target waveform data, obtain the phase current and phase electric field of each second fault indicator after the fault time; Based on the phase current and electric field of each second fault indicator after the fault time, the second fault indicator with zero phase current and phase electric field amplitude is selected as the open circuit fault indicator. Based on the third line topology diagram, the line segment between the open circuit fault indicator and the adjacent second fault indicator that has not experienced an open circuit fault is designated as the open circuit fault segment, and open circuit 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 power transmission and distribution lines. The master station is communicatively connected to the fault indicators. The master station performs fault judgment using the power transmission and distribution line fault judgment method based on topology dynamic reconfiguration as described in any one of claims 1 to 6.

8. A fault detection device for power transmission and distribution lines, characterized in that, include: The first topology generation module is used to obtain the first line topology map of the transmission and distribution line, which is used to indicate the initial number and initial level of all fault indicators of the transmission and distribution line. The monitoring data acquisition module is used to identify the first fault indicator based on the monitoring data before the fault occurs. The monitoring data includes the current and electric field data of all fault indicators. The first fault indicator is used to indicate the fault indicator where the current and electric field are zero. The second topology generation module is used to remove the first fault indicator from the first line topology map to obtain the second line topology map. The topology reconstruction module is used to reconstruct the second line topology based on the current magnitude of the second fault indicator, reconstruct the numbering and hierarchical relationship of the remaining fault indicators, and obtain a third line topology. The specific steps for reconstructing the numbering and hierarchical relationship of the remaining fault indicators are as follows: Obtain the current data of all second fault indicators from the monitoring data; designate the second fault indicator with the largest current as layer 0; based on the second fault indicators in layer 0 and the second line topology, construct new layers sequentially according to current magnitude, where the current of the preceding fault indicator is greater than or equal to that of the following fault indicator; dynamically determine the layer of the remaining fault indicators based on current magnitude and pre-set preceding and following layers, and number them according to the new layers and preceding and following layer relationships; different fault indicators in the same layer are numbered according to their preceding and following positions to obtain the third line topology. The third line topology is used to indicate the current number, current layer, and position information of the remaining fault indicators, where the second fault indicator is any fault indicator other than the first fault indicator among all fault indicators. The waveform data acquisition module is used to acquire target waveform data, which is the waveform data of the second fault indicator after the fault occurred. The fault analysis module is used to perform fault analysis based on the third line topology diagram and target waveform data to obtain fault data, which 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 power transmission and distribution line fault judgment method based on topology dynamic reconfiguration as described in any one of claims 1-6.

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 power transmission and distribution line fault judgment method based on dynamic topology reconfiguration as described in any one of claims 1-6.

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