Voltage fault location method, system, computer device and storage medium

Abstract

The application relates to a voltage fault positioning method, system, computer device, storage medium and computer program product. The method comprises the following steps: acquiring corresponding real-time monitoring data of each monitoring point and line connection relationships between the monitoring points based on a power quality monitoring system; comparing actual voltage data contained in the real-time monitoring data with preset voltage data of the corresponding monitoring points, combining the line connection relationships, and determining a fault occurrence area; extracting lines on which voltage sag sources are possibly located from the fault occurrence area to form a fault occurrence line set; judging a fault type causing the voltage sag; setting a virtual fault point on each line of the fault occurrence line set, calculating estimated voltage data of the monitoring points according to distances between the virtual fault point and the monitoring points, comparing the estimated voltage data with actual voltage data corresponding to the monitoring points, and determining a fault position. The method can reduce the calculation difficulty of the fault position investigation process, and achieves the effect of quickly and accurately positioning the voltage fault position.

Description

Technical Field

[0001] This application relates to the technical field of power grids, and in particular to a voltage fault location method, system, computer equipment, storage medium, and computer program product. Background Technology

[0002] With the development of power grid technology, the quality of power supply is crucial to the normal operation of users' production and daily life, and has a significant impact. Among the many issues affecting power quality, voltage sag plays a vital role, causing huge economic losses every year. Voltage sag is the phenomenon of a sudden drop in the effective value of the supply voltage followed by a recovery within a short period of time; most voltage sags are caused by short-circuit faults.

[0003] Short-circuit faults are typically located by establishing a fault distance function, which involves analyzing monitoring points based on the established network topology.

[0004] However, as the power grid continues to expand and the complexity of its topology increases, the location of voltage faults will inevitably require extensive and systematic analysis and evaluation, placing a heavy burden on management personnel for fault diagnosis. Summary of the Invention

[0005] Therefore, it is necessary to provide a method, system, computer equipment, storage medium, and computer program product that can reduce the computational difficulty of the fault location investigation process and achieve rapid and accurate location of voltage faults, in order to address the above-mentioned technical problems.

[0006] Firstly, this application provides a voltage fault location method. The method includes:

[0007] The power quality monitoring system acquires real-time monitoring data for each monitoring point; the real-time monitoring data includes actual voltage data.

[0008] The power quality monitoring system is used to obtain the line connection relationships between monitoring points;

[0009] Compare the actual voltage data with the preset voltage data at the corresponding monitoring points;

[0010] Based on the line connection relationship, the area where the monitoring point where the voltage dip occurred was determined to be the fault area;

[0011] Extract the lines where voltage sag sources may be located from the fault location area and form a set of fault-prone lines;

[0012] On each line in the set of lines where the fault occurred, several virtual fault points were set;

[0013] The estimated voltage data of the monitoring point is calculated based on the distance between the virtual fault point and the monitoring point;

[0014] By comparing the actual voltage data with the estimated voltage data at the monitoring points, the location of the fault can be determined.

[0015] In one embodiment, determining the area where the monitoring point experiencing a voltage dip occurs is the fault location, based on line connection relationships, includes:

[0016] A monitoring matrix is ​​generated based on the line connection relationships of the monitoring points; the monitoring matrix represents the power grid topology with the monitoring points as nodes.

[0017] A fault point matrix is ​​generated based on whether a voltage dip occurs at the monitoring point.

[0018] Multiplying the monitoring matrix by the fault point matrix yields a matrix representation of the fault location area.

[0019] In one embodiment, the lines where voltage sag sources may be located are extracted from the fault location area, forming a set of fault-prone lines including:

[0020] Extract the lines where the monitoring points where voltage dips occur; set the lines where the monitoring points where voltage dips occur as the first line set;

[0021] Extract the upstream and downstream lines of the monitoring point where the voltage dip occurs;

[0022] Identify the lines where voltage dips occur; define the lines where voltage dips occur as the second set of lines.

[0023] Obtain the intersection of the first set of lines and the second set of lines; the intersection is the set of lines where the fault occurred.

[0024] In one embodiment, determining the line where a voltage sag occurs and defining the line where the voltage sag occurs as a second set of lines includes:

[0025] The first reactive power before the voltage sag occurs and the second reactive power during the voltage sag are obtained by real-time monitoring data. If the second reactive power is greater than zero and greater than the first reactive power, it is determined that the voltage sag occurs on the upstream line of the monitoring point; otherwise, it is determined that the voltage sag occurs on the downstream line of the monitoring point.

[0026] The lines where voltage dips occur are designated as the second set of lines.

[0027] In one embodiment, determining the fault location by comparing the actual voltage data corresponding to the monitoring point with the estimated voltage data includes:

[0028] By comparing the estimated voltage data from multiple monitoring points with the actual voltage data, the deviation value is obtained.

[0029] The virtual fault point corresponding to the largest deviation value is determined as the fault location.

[0030] In one embodiment, the method further includes determining the type of fault causing the voltage sag;

[0031] The types of faults that cause voltage sags include:

[0032] Obtain voltage phasor information of centralized monitoring points on the faulty line based on real-time monitoring data;

[0033] If only one phase voltage value in the voltage phasor information of the monitoring point is lower than the average three-phase voltage, and the difference between the three-phase voltage values ​​and the average three-phase voltage is greater than the first threshold, then it is determined to be a single-phase grounding fault.

[0034] If only one phase voltage value in the voltage phasor information of the monitoring point is higher than the average of its three phase voltages, and the difference between the three phase voltage values ​​and the average of the three phase voltages is greater than the first threshold, then if the zero-sequence component is greater than the second threshold, it is determined to be a two-phase ground fault; if the zero-sequence component is less than the second threshold, it is determined to be a phase-to-phase fault.

[0035] If the difference between the three-phase voltage value and the average three-phase voltage value is less than the first threshold, it is determined to be a three-phase fault.

[0036] Secondly, this application also provides a voltage fault location system. The system includes:

[0037] The acquisition module is used to acquire real-time monitoring data for each monitoring point based on the power quality monitoring system; the real-time monitoring data includes actual voltage data; and the module acquires the line connection relationships between monitoring points based on the power quality monitoring system.

[0038] The fault area determination module is used to compare the actual voltage data with the preset voltage data of the corresponding monitoring point; and, in combination with the line connection relationship, determine the area where the monitoring point where the voltage dip occurs is the fault area.

[0039] The fault occurrence line set determination module is used to extract the lines where the voltage sag source may be located from the fault occurrence area and form a fault occurrence line set.

[0040] The fault type determination module is used to determine the type of fault that causes the voltage sag.

[0041] The fault location module is used to set several virtual fault points on each line in the fault location set; calculate the estimated voltage data of the monitoring point based on the distance between the virtual fault point and the monitoring point; and compare the actual voltage data corresponding to the monitoring point with the estimated voltage data to determine the fault location.

[0042] Thirdly, this application also provides a computer device. The computer device includes a memory and a processor, the memory storing a computer program, and the processor executing the computer program to implement the above-described voltage fault location method.

[0043] Fourthly, this application also provides a storage medium. The storage medium stores a computer program thereon, which, when executed by a processor, implements the aforementioned voltage fault location method.

[0044] Fifthly, this application also provides a computer program product. The computer program product includes a computer program that, when executed by a processor, implements the aforementioned voltage fault location method.

[0045] The aforementioned voltage fault location method, system, computer equipment, storage medium, and computer program products fully utilize the power quality monitoring system to acquire real-time monitoring data from monitoring points and the line connection relationships between monitoring points. This allows for a comprehensive understanding of the operational status of all monitoring points in the distribution network, initially identifying areas with abnormal real-time monitoring data as fault locations, thus narrowing the investigation scope and significantly reducing subsequent computational load. This lays the foundation for targeted extraction of fault-prone line sets within the fault location area. Furthermore, selecting all lines potentially experiencing voltage dips from the fault location area forms a fault-prone line set, further narrowing the fault range and providing a more precise delineation for determining the fault location. Virtual fault points are used as reference points to calculate estimated voltage data for monitoring points. The greater the difference between the estimated voltage data and the actual voltage data of the corresponding monitoring point, the higher the probability that the virtual fault point is the fault location, thus determining the final fault location. The determination of whether each virtual fault point is a fault location is independent, effectively avoiding misjudgments caused by the mutual transmission and superposition of fault effects in the distribution network. It also avoids complex calculation processes, reducing the difficulty and time required for fault location, enabling timely fault handling and minimizing social losses. Attached Figure Description

[0046] Figure 1 This is a flowchart illustrating a voltage fault location method in one embodiment;

[0047] Figure 2 This is a schematic diagram illustrating the positional relationship between the upstream and downstream lines in one embodiment;

[0048] Figure 3 This is a flowchart illustrating the process of determining the fault location in one embodiment;

[0049] Figure 4 This is a flowchart illustrating the process of composing a fault-causing line set in one embodiment;

[0050] Figure 5This is a structural block diagram of a voltage fault location system in one embodiment;

[0051] Figure 6 This is an internal structural diagram of a computer device in one embodiment. Detailed Implementation

[0052] To make the objectives, technical solutions, and advantages of this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the scope of this application.

[0053] The voltage fault location method provided in this application can be applied to power grids to locate faults causing voltage dips. In one embodiment, such as... Figure 1 As shown, a voltage fault location method is provided, including the following steps:

[0054] Step 102: Obtain the corresponding real-time monitoring data of each monitoring point based on the power quality monitoring system; the real-time monitoring data includes the actual voltage data.

[0055] Step 104: Obtain the line connection relationship between monitoring points based on the power quality monitoring system.

[0056] In one embodiment, the order of steps 102 and 104 is not limited. They can be performed simultaneously, or the corresponding real-time monitoring data of each monitoring point can be obtained first, followed by the acquisition of the line connection relationship between the monitoring points. Alternatively, the line connection relationship between the monitoring points can be obtained first, followed by the acquisition of the corresponding real-time monitoring data of each monitoring point.

[0057] The power quality monitoring system utilizes power quality monitoring terminals installed on the grid side or user side to transmit data back to the monitoring center via a network, enabling simultaneous monitoring of multiple locations. This allows for online monitoring and statistical analysis of various power quality indicators of the power grid. Power quality indicators include voltage deviation, frequency deviation, harmonics, voltage fluctuation, flicker, and three-phase voltage imbalance. The locations being monitored are called monitoring points.

[0058] Specifically, a power quality monitoring system generally includes terminal monitoring units, a communication service system, a database service system, and a monitoring and analysis platform. The terminal monitoring units collect real-time monitoring data, including voltage and current, and upload it to the storage container of the database service system via the communication service system. The monitoring and analysis platform uses the real-time monitoring data to analyze power quality. This application, by accessing the power quality monitoring system, can obtain various types of real-time monitoring data stored in the database service system. When the power quality monitoring system is built, the line connection relationships between monitoring points can be stored simultaneously in the database service system, thereby enabling the acquisition of these line connection relationships when accessing the power quality monitoring system.

[0059] Using power quality monitoring systems to locate faults helps both power suppliers and users distinguish fault responsibilities. Furthermore, different fault locations result in different socio-economic losses, thus having engineering application value for assessing the impact of voltage sags.

[0060] Step 106: Compare the actual voltage data with the preset voltage data of the corresponding monitoring point.

[0061] The preset voltage data can be obtained by analyzing historical data from the monitoring point. This historical data is also provided by the power quality monitoring system. Under normal circumstances, the historical data fluctuates within a fixed range. If the actual voltage data at the monitoring point exceeds this fixed range, it indicates a potential fault at or near the monitoring point, requiring further investigation.

[0062] The preset voltage data can be a fixed range or a fixed value. If the actual voltage data at the monitoring point suddenly exceeds the lower limit of the preset voltage data fixed range or falls below the preset voltage data fixed value within a certain range within a few seconds, and then suddenly recovers, it is determined that a voltage dip has occurred at the monitoring point.

[0063] Step 108: Based on the line connection relationship, determine the area where the monitoring point where the voltage dip occurs is the fault area.

[0064] The area enclosed by multiple monitoring points where voltage dips occur is the fault location.

[0065] Step 110: Extract the possible voltage sag sources from the fault location area and form a fault location line set.

[0066] A voltage sag source is an interference source that causes a voltage sag. The line where the voltage sag source is located is the line where the interference source of the voltage sag is located. Generally, the monitoring point is used as a reference point to determine whether the voltage sag source is located upstream or downstream of the monitoring point. For example... Figure 2As shown, referring to the direction of active power flow from upstream to downstream, if the fault occurs upstream of the monitoring point, it is said that the voltage sag source occurs in the upstream line; if the fault occurs downstream of the monitoring point, it is said that the voltage sag source occurs in the downstream line.

[0067] Voltage sag source location methods include methods based on disturbance power and disturbance energy, methods based on the real part of impedance, methods based on voltage sag classification, and so on.

[0068] Step 112: Set several virtual fault points on each line in the fault location set.

[0069] Virtual fault points can be set at equal intervals, or at important nodes, such as near electrical equipment; or a combination of both can be used, that is, while setting them at equal intervals, additional points can be set at important nodes.

[0070] In one embodiment, virtual fault points can be set multiple times. When setting virtual fault points for the first time, the distance between the virtual fault points can be relatively large. After obtaining a first fault range by setting virtual fault points for the first time, virtual fault points are set a second time within the first fault range, this time with the distance between the virtual fault points reduced, thereby obtaining a second fault range, and so on.

[0071] Step 114: Calculate the estimated voltage data of the monitoring point based on the distance between the virtual fault point and the monitoring point.

[0072] Assuming that no fault has occurred at the virtual fault point, the voltage data at the virtual fault point is detected, and the voltage data of the monitoring points at a certain distance are calculated using the virtual fault point as a reference point. This is the estimated voltage data.

[0073] Step 116: Compare the actual voltage data and estimated voltage data corresponding to the monitoring point to determine the fault location. The greater the difference between the actual voltage data and the estimated voltage data, the higher the probability that a fault has occurred at the virtual fault point.

[0074] The voltage fault location method described above utilizes terminal monitoring units distributed within the power quality monitoring system to extract effective information from voltage sag data, thus solving the voltage fault location problem. By first determining the fault location area using data obtained from the power quality monitoring system, and then identifying the faulty line set, the investigation scope is gradually narrowed, facilitating subsequent precise fault location. Finally, by setting a virtual fault point, the estimated voltage data of the monitoring point is calculated and compared with the actual voltage data to determine the fault location. This method effectively avoids misjudgments caused by the mutual transmission and superposition of fault effects in the distribution network, and also avoids complex calculation processes, thereby achieving rapid and accurate fault location.

[0075] In one embodiment, such as Figure 3As shown, in step 108, based on the line connection relationship, determining the area where the monitoring point where the voltage dip occurs is located as the fault area includes:

[0076] Step 302: Generate a monitoring matrix based on the line connection relationship of the monitoring points. The monitoring matrix represents the power grid topology with the monitoring points as nodes.

[0077] Assuming there are n monitoring points in the power grid topology, then the monitoring matrix G is an n-order matrix. ij This indicates a feeder line connecting monitoring point i and monitoring point j, where the subscripts i and j represent the monitoring point numbers. When monitoring point i and monitoring point j are connected by a feeder line, the corresponding G... ij and G ji The element is 1, and the rest are 0.

[0078] Step 304: Generate a fault point matrix based on whether a voltage dip occurs at the monitoring point.

[0079] Assuming the fault point matrix is ​​represented by M, when a voltage dip occurs at monitoring point i, element M... ii The first element is 1, and all other elements are 0.

[0080] Step 306: Multiply the monitoring matrix with the fault point matrix to obtain a matrix representation of the fault occurrence area.

[0081] Assuming the fault location is represented by H, when element H ij When the value is 1, it indicates that the feeder between monitoring point i and monitoring point j belongs to the fault occurrence area.

[0082] In this embodiment, the line connection relationship directly reflects the feeder connection status between each monitoring point. Therefore, the monitoring matrix can be obtained from the line connection relationship. Whether a voltage sag occurs at a monitoring point can be obtained through real-time monitoring data. Then, the fault location can be determined through the matrix. This allows for the rapid identification of all lines affected by voltage sags, i.e., the fault location, from the complex power grid topology.

[0083] In one embodiment, such as Figure 4 As shown, in step 106, the possible voltage sag sources are extracted from the fault location area, forming a set of fault location lines including:

[0084] Step 402: Extract the lines where the monitoring points experiencing voltage sags are located, and set these lines as the first line set. In other words, all feeders connected to the monitoring points experiencing voltage sags constitute the first line set.

[0085] Step 404: Extract the upstream and downstream lines of the monitoring points where voltage sags occur; determine all lines where voltage sags occur, and set the lines where voltage sags occur as the second line set.

[0086] In this embodiment, reactive power is determined by the reactive power occurring before the voltage sag, which is Q. m The reactive power during the voltage sag is Q. fm When Q m Less than Q fm And Q fm When the value is greater than 0, the voltage sag occurs on the upstream line; otherwise, the voltage sag occurs on the downstream line. The set of lines where voltage sags occur is the second set of lines.

[0087] Step 406: Obtain the intersection of the first line set and the second line set; the intersection is the line set where the fault occurred.

[0088] In this embodiment, the lines obtained by taking the intersection of the first line set and the second line set belong to both the fault location area and the line where the voltage sag source is located, which further narrows the scope of fault investigation and is beneficial for subsequent investigation.

[0089] In one embodiment, the method further includes determining the fault type causing the voltage sag. The fault type determination can occur at any point between steps 110 and 116, or after step 116, and is used for subsequent reference by staff to address the fault problem in a targeted manner.

[0090] The above-mentioned fault types include single-phase grounding faults, phase-to-phase faults, two-phase grounding faults, and three-phase faults. A single-phase grounding fault refers to a single-phase grounding fault in an ungrounded neutral system, meaning the live wire (any one phase) is directly connected to the ground wire without passing through a load. A phase-to-phase fault refers to a short circuit between any two phases of the three-phase conductors, even though the insulation to ground is good. A two-phase grounding fault refers to a single-phase grounding fault occurring between any two phases in an ungrounded neutral system. A three-phase fault refers to a failure of insulation between the three phases. Identifying the fault type is crucial for developing appropriate measures to eliminate it.

[0091] In this embodiment, the fault types that cause voltage sags include:

[0092] The voltage phasor information of the centralized monitoring points of the faulty line is obtained based on real-time monitoring data.

[0093] If the voltage phasor information at the monitoring point shows that only one phase voltage value is lower than the average three-phase voltage U... m This means that the voltage value of one phase at the monitoring point is lower than the average value U of its three phase voltages. m The voltage values ​​of the other two phases are higher than the average value U of the three-phase voltages. m And the three-phase voltage values ​​and the three-phase voltage average U m If the difference between the values ​​is greater than the first threshold, it is determined to be a single-phase ground fault.

[0094] In the voltage phasor information at the monitoring point, only one phase voltage value is higher than its three-phase voltage average U. m This means that the voltage values ​​of two phases at the monitoring point are lower than the average value U of its three phase voltages. m The voltage value of the other phase is higher than the average value U of its three phase voltages. m And the three-phase voltage values ​​and the three-phase voltage average U m If the difference between the two phases is greater than the first threshold, and the zero-sequence component is greater than the second threshold, it is determined to be a two-phase ground fault; if the zero-sequence component is less than the second threshold, it is determined to be a phase-to-phase fault.

[0095] If the three-phase voltage value and the average three-phase voltage U m If the difference between the values ​​is less than the first threshold, it is determined to be a three-phase fault.

[0096] The first and second thresholds mentioned above are set according to the actual situation of the distribution network.

[0097] In one embodiment, step 116, comparing the actual voltage data corresponding to the monitoring point with the estimated voltage data to determine the fault location, includes:

[0098] By comparing the estimated voltage data from multiple monitoring points with the actual voltage data, the deviation value is obtained, and the virtual fault point corresponding to the largest deviation value is determined as the fault location.

[0099] Using a virtual fault point as a reference, the estimated voltage data of a monitoring point at a certain distance from the virtual fault point is calculated, and then compared with the actual voltage data of that monitoring point. If the deviation is large, it indicates that the virtual fault point is more likely to be the fault location. All virtual fault points are sorted in order of deviation value, and the virtual fault point with the largest deviation value is most likely to be the fault location. This can be verified using other methods to determine the fault location. Simulation experiments demonstrate that the location accuracy is good and conforms to actual fault conditions.

[0100] In one embodiment, the fault location can be represented by a range. The fault location is the range centered on the finally selected virtual fault point and bounded by adjacent virtual fault points. Therefore, the denser the virtual fault points are, the more accurate the final fault location will be. It is understandable that in some cases, trade-offs are made based on the scope of the investigation area, the urgency of the situation, etc., to balance the needs of both positioning accuracy and speed.

[0101] In one embodiment, a fault distance function can be established, with input parameters including the distance between the virtual fault point and the monitoring point, and the voltage of the virtual fault point, to quickly calculate the estimated voltage data of the monitoring point, thereby further accelerating the fault location process. The fault distance function is primarily a functional method for measuring transmission line faults using impedance analysis or traveling wave propagation theory.

[0102] In one embodiment, the voltage fault location method includes the following steps:

[0103] Step S502: Obtain the corresponding real-time monitoring data of each monitoring point based on the power quality monitoring system; the real-time monitoring data includes actual voltage data.

[0104] Step S504: Obtain the line connection relationship between monitoring points based on the power quality monitoring system.

[0105] Step S506: Compare the actual voltage data with the preset voltage data of the corresponding monitoring point.

[0106] Step S508: Generate a monitoring matrix based on the line connection relationship of the monitoring points; the monitoring matrix represents the power grid topology with the monitoring points as nodes.

[0107] Step S510: Generate a fault point matrix based on whether a voltage dip occurs at the monitoring point.

[0108] Step S512: Multiply the monitoring matrix and the fault point matrix to obtain a matrix representation of the fault occurrence area.

[0109] Step S514: Extract the line where the monitoring point where the voltage sag occurs; set the line where the monitoring point where the voltage sag occurs as the first line set.

[0110] Step S516: Obtain the first reactive power before the voltage sag occurs at the monitoring point and the second reactive power during the voltage sag at the monitoring point through real-time monitoring data; if the second reactive power is greater than zero and greater than the first reactive power, it is determined that the voltage sag occurs on the upstream line of the monitoring point; otherwise, it is determined that the voltage sag occurs on the downstream line of the monitoring point.

[0111] The lines where voltage dips occur are designated as the second set of lines.

[0112] Step S518: Obtain the intersection of the first line set and the second line set; the intersection is the line set where the fault occurred.

[0113] Step S520: Obtain voltage phasor information of the centralized monitoring points of the faulty line based on real-time monitoring data;

[0114] If only one phase voltage value in the voltage phasor information of the monitoring point is lower than the average three-phase voltage, and the difference between the three-phase voltage values ​​and the average three-phase voltage is greater than the first threshold, then it is determined to be a single-phase grounding fault.

[0115] If only one phase voltage value in the voltage phasor information of the monitoring point is higher than the average of its three phase voltages, and the difference between the three phase voltage values ​​and the average of the three phase voltages is greater than the first threshold, then if the zero-sequence component is greater than the second threshold, it is determined to be a two-phase ground fault; if the zero-sequence component is less than the second threshold, it is determined to be a phase-to-phase fault.

[0116] If the difference between the three-phase voltage value and the average three-phase voltage value is less than the first threshold, it is determined to be a three-phase fault.

[0117] Step S522: On each line of the fault-occurring line set, set several virtual fault points;

[0118] Step S524: Calculate the estimated voltage data of the monitoring point based on the distance between the virtual fault point and the monitoring point;

[0119] Step S526: Compare the estimated voltage data from multiple monitoring points with the actual voltage data to obtain the deviation value;

[0120] Step S528: Determine the virtual fault point corresponding to the largest deviation value as the fault location.

[0121] It should be understood that although the steps in the flowcharts of the embodiments described above are shown sequentially according to the arrows, these steps are not necessarily executed in the order indicated by the arrows. Unless explicitly stated herein, there is no strict order restriction on the execution of these steps, and they can be executed in other orders. Moreover, at least some steps in the flowcharts of the embodiments described above may include multiple steps or multiple stages. These steps or stages are not necessarily completed at the same time, but can be executed at different times. The execution order of these steps or stages is not necessarily sequential, but can be performed alternately or in turn with other steps or at least some of the steps or stages of other steps.

[0122] Based on the same inventive concept, this application also provides a voltage fault location system for implementing the voltage fault location method described above. The solution provided by this system is similar to the implementation scheme described in the above method; therefore, the specific limitations in one or more voltage fault location system embodiments provided below can be found in the limitations of the voltage fault location method described above, and will not be repeated here.

[0123] In one embodiment, such as Figure 5 As shown, a voltage fault location system is provided, including: an acquisition module, a fault area determination module, a fault occurrence line set determination module, a fault type determination module, and a fault location module, wherein:

[0124] The acquisition module 502 is used to acquire corresponding real-time monitoring data of each monitoring point based on the power quality monitoring system; the real-time monitoring data includes actual voltage data; and to acquire the line connection relationship between the monitoring points based on the power quality monitoring system.

[0125] The fault area determination module 504 is used to compare the actual voltage data with the preset voltage data of the corresponding monitoring point; and, in combination with the line connection relationship, determine the area where the monitoring point where the voltage dip occurs is the fault area.

[0126] The fault occurrence line set determination module 506 is used to extract the possible voltage sag sources from the fault occurrence area and form a fault occurrence line set.

[0127] The fault type determination module 508 is used to determine the fault type that causes the voltage sag.

[0128] The fault location module 510 is used to set several virtual fault points on each line of the fault location line set; calculate the estimated voltage data of the monitoring point based on the distance between the virtual fault point and the monitoring point; and compare the actual voltage data corresponding to the monitoring point with the estimated voltage data to determine the fault location.

[0129] In the aforementioned voltage fault location system, the acquisition module utilizes terminal monitoring units distributed within the power quality monitoring system to extract effective information from voltage sag data to solve the voltage fault location problem. Using data acquired from the power quality monitoring system, the fault area determination module first identifies the fault location, then the fault line set determination module identifies the fault line set, gradually narrowing down the investigation scope and facilitating precise fault location. The fault type determination module identifies the fault type, enabling targeted fault resolution. Finally, the fault location module sets a virtual fault point, calculates estimated voltage data for the monitoring point, and compares it with actual voltage data to determine the fault location. This method effectively avoids misjudgments caused by the mutual transmission and superposition of fault effects in the distribution network, while also avoiding complex calculation processes, thus achieving rapid and accurate fault location.

[0130] Each module in the aforementioned voltage fault location system can be implemented entirely or partially through software, hardware, or a combination thereof. These modules can be embedded in the processor of a computer device in hardware form or independent of it, or stored in the memory of the computer device in software form, so that the processor can call and execute the corresponding operations of each module.

[0131] In one embodiment, a computer device is provided, which may be a server, and its internal structure diagram may be as follows: Figure 6As shown, this computer device includes a processor, memory, input / output (I / O) interfaces, and a communication interface. The processor, memory, and I / O interfaces are connected via a system bus, and the communication interface is also connected to the system bus via the I / O interfaces. The processor provides computational and control capabilities. The memory includes non-volatile storage media and internal memory. The non-volatile storage media stores the operating system, computer programs, and a database. The internal memory provides the environment for the operating system and computer programs stored in the non-volatile storage media. The database stores real-time monitoring data, etc. The I / O interfaces are used for exchanging information between the processor and external devices. The communication interface is used for communication with external terminals via a network connection. When executed by the processor, the computer program implements a voltage fault location method.

[0132] In one embodiment, a computer device is provided, including a memory and a processor, wherein the memory stores a computer program, and the processor executes the computer program to implement the steps in the above-described method embodiments.

[0133] In one embodiment, a storage medium is provided on which a computer program is stored, which, when executed by a processor, implements the steps in the above method embodiments.

[0134] In one embodiment, a computer program product is provided, including a computer program that, when executed by a processor, implements the steps in the above method embodiments.

[0135] Those skilled in the art will understand that all or part of the processes in the above embodiments can be implemented by a computer program instructing related hardware. The computer program can be stored in a non-volatile computer-readable storage medium, and when executed, it can include the processes of the embodiments described above. Any references to memory, databases, or other media used in the embodiments provided in this application can include at least one of non-volatile and volatile memory. Non-volatile memory can include read-only memory (ROM), magnetic tape, floppy disk, flash memory, optical memory, high-density embedded non-volatile memory, resistive random access memory (ReRAM), magnetic random access memory (MRAM), ferroelectric random access memory (FRAM), phase change memory (PCM), graphene memory, etc. Volatile memory can include random access memory (RAM) or external cache memory, etc. By way of illustration and not limitation, RAM can take many forms, such as Static Random Access Memory (SRAM) or Dynamic Random Access Memory (DRAM). The databases involved in the embodiments provided in this application may include at least one type of relational database and non-relational database. Non-relational databases may include, but are not limited to, blockchain-based distributed databases. The processors involved in the embodiments provided in this application may be general-purpose processors, central processing units, graphics processing units, digital signal processors, programmable logic devices, quantum computing-based data processing logic devices, etc., and are not limited to these.

[0136] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0137] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of this patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this application should be determined by the appended claims.

Claims

1. A voltage fault location method, characterized in that, The method includes: The power quality monitoring system acquires real-time monitoring data for each monitoring point. The real-time monitoring data includes actual voltage data. The power quality monitoring system includes a terminal monitoring unit, a communication service system, a database service system, and a monitoring and analysis platform. The terminal monitoring unit collects real-time monitoring data including voltage and current, and uploads it to the storage container of the database service system through the communication service system. The monitoring and analysis platform uses the real-time monitoring data to analyze power quality. The power quality monitoring system is used to obtain the line connection relationship between the monitoring points; By comparing the actual voltage data with the preset voltage data of the corresponding monitoring point, if the actual voltage data exceeds the fixed range corresponding to the preset voltage data, it is determined that the corresponding monitoring point has a fault; wherein, the preset voltage data is obtained by statistically analyzing the historical data of the corresponding monitoring point, and the historical data of the corresponding monitoring point is obtained by the power quality monitoring system; A monitoring matrix is ​​generated based on the line connection relationships of the monitoring points; the monitoring matrix represents the power grid topology with the monitoring points as nodes; the elements in the monitoring matrix represent the direct feeder connection relationships between the monitoring points; A fault point matrix is ​​generated based on whether a voltage dip occurs at the monitoring point; the matrix elements of the fault point matrix correspond to the fault status of the monitoring point. Multiplying the monitoring matrix with the fault point matrix yields a matrix representation of the fault occurrence area; wherein, the lines corresponding to the non-zero elements in the matrix representation constitute the fault occurrence area; the fault occurrence area is the region enclosed by multiple monitoring points where voltage dips occur; Extract the lines where voltage sag sources may be located from the fault location area to form a fault line set; On each line of the set of lines where the fault occurred, several virtual fault points were set; The estimated voltage data of the monitoring point is calculated based on the distance between the virtual fault point and the monitoring point; By comparing the actual voltage data corresponding to the monitoring point with the estimated voltage data, the location of the fault can be determined.

2. The method according to claim 1, characterized in that, The fault location is defined as the range centered on the finally selected virtual fault point and bounded by adjacent virtual fault points.

3. The method according to claim 1, characterized in that, The step of extracting the possible voltage sag sources from the fault location area to form a fault location line set includes: Extract the line where the monitoring point where the voltage sag occurs; set the line where the monitoring point where the voltage sag occurs as the first line set; Extract the upstream and downstream lines of the monitoring point where the voltage sag occurred; Identify the lines where voltage dips occur; define the lines where voltage dips occur as the second set of lines; Obtain the intersection of the first set of lines and the second set of lines; the intersection is the set of lines where the fault occurred.

4. The method according to claim 3, characterized in that, The circuit that is experiencing a voltage dip; The second set of lines where voltage dips occur includes: The first reactive power before the voltage sag at the monitoring point and the second reactive power during the voltage sag at the monitoring point are obtained through the real-time monitoring data. If the second reactive power is greater than zero and greater than the first reactive power, then the voltage sag is determined to occur on the upstream line of the monitoring point; otherwise, the voltage sag is determined to occur on the downstream line of the monitoring point. The lines where voltage dips occur are designated as the second set of lines.

5. The method according to claim 1, characterized in that, The step of comparing the actual voltage data corresponding to the monitoring point with the estimated voltage data to determine the fault location includes: By comparing the estimated voltage data with the actual voltage data from multiple monitoring points, the deviation value is obtained; The virtual fault point corresponding to the maximum deviation value is determined as the fault location.

6. The method according to claim 1, characterized in that, The method also includes determining the type of fault causing the voltage sag; The fault types that cause voltage dips include: Based on the real-time monitoring data, obtain the voltage phasor information of the centralized monitoring points of the faulty line; If only one phase voltage value in the voltage phasor information of the monitoring point is lower than the average three-phase voltage, and the difference between the three-phase voltage value and the average three-phase voltage is greater than the first threshold, then it is determined to be a single-phase grounding fault. If only one phase voltage value in the voltage phasor information of the monitoring point is higher than its three-phase voltage average value, and the difference between the three-phase voltage value and the three-phase voltage average value is greater than the first threshold, then if the zero-sequence component is greater than the second threshold, it is determined to be a two-phase ground fault; if the zero-sequence component is less than the second threshold, it is determined to be a phase-to-phase fault. If the difference between the three-phase voltage value and the average three-phase voltage value is less than the first threshold, it is determined to be a three-phase fault.

7. A voltage fault location system, characterized in that, The system includes: The acquisition module is used to acquire real-time monitoring data corresponding to each monitoring point based on the power quality monitoring system; the real-time monitoring data includes actual voltage data; wherein, the power quality monitoring system includes a terminal monitoring unit, a communication service system, a database service system, and a monitoring and analysis platform; the terminal monitoring unit collects real-time monitoring data including voltage and current, and uploads it to the storage container of the database service system for storage through the communication service system; the monitoring and analysis platform uses the real-time monitoring data to analyze power quality; and acquires the line connection relationship between the monitoring points based on the power quality monitoring system; The fault area determination module compares the actual voltage data with the preset voltage data of the corresponding monitoring point. If the actual voltage data exceeds the fixed range corresponding to the preset voltage data, it determines that a fault has occurred at the corresponding monitoring point. The preset voltage data is obtained from historical data of the corresponding monitoring point, which is obtained by the power quality monitoring system. A monitoring matrix is ​​generated based on the line connection relationships of the monitoring points. The monitoring matrix represents the power grid topology with the monitoring points as nodes. The elements in the monitoring matrix represent the direct feeder connections between the monitoring points. A fault point matrix is ​​generated based on whether a voltage sag has occurred at the monitoring point. The matrix elements of the fault point matrix correspond to the fault states of the monitoring points. The monitoring matrix and the fault point matrix are multiplied to obtain a matrix representation of the fault occurrence area. The lines corresponding to the non-zero elements in the matrix representation constitute the fault occurrence area. The fault occurrence area is the region enclosed by multiple monitoring points experiencing voltage sags. The fault occurrence line set determination module is used to extract the lines where the voltage sag source may be located from the fault occurrence area and form a fault occurrence line set. The fault type determination module is used to determine the type of fault that causes the voltage sag. The fault location module is used to set several virtual fault points on each line of the fault occurrence line set; calculate the estimated voltage data of the monitoring point based on the distance between the virtual fault point and the monitoring point; and compare the actual voltage data corresponding to the monitoring point with the estimated voltage data to determine the fault location.

8. A computer device comprising a memory and a processor, wherein the memory stores a computer program, characterized in that, When the processor executes the computer program, it implements the steps of the method according to any one of claims 1 to 6.

9. A storage medium having a computer program stored thereon, characterized in that, When the computer program is executed by a processor, it implements the steps of the method according to any one of claims 1 to 6.

10. A computer program product, comprising a computer program, characterized in that, When the computer program is executed by a processor, it implements the steps of the method according to any one of claims 1 to 6.

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