Fault positioning method and device and computer equipment

Abstract

The invention relates to a fault positioning method and device and computer equipment. The method comprises the following steps: acquiring voltage sag recording data acquired by a plurality of fault recording devices in a power transmission loop at corresponding monitoring points; the types of the fault recording devices are different; target homologous data matched with the voltage sag recording data are screened out from the multiple pieces of initial homologous data; the plurality of initial homologous data are determined based on the starting time and the duration of the voltage sag recording data; and based on the power upstream and downstream lists of the plurality of lines in the power transmission loop relative to each monitoring point and the target homologous data, positioning a fault in the power transmission loop, and determining a fault line in the power transmission loop. By adopting the method, the fault positioning accuracy can be improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of fault positioning, in particular to a fault positioning method, device and computer equipment. BACKGROUND

[0002] With the rapid development of high-end manufacturing industry, the economic loss of sensitive load caused by voltage sag is increasing. As one of the main causes of voltage sag, accurate positioning of short-circuit fault is very important for subsequent line maintenance.

[0003] In the related art, the short-circuit fault position in the power transmission circuit is determined by analyzing the fault recording data, that is, the fault is positioned. However, due to the different types of fault recording devices in the power transmission circuit, the quality of the collected fault recording data is uneven, which makes the accuracy of fault positioning in the related art not high. SUMMARY

[0004] Therefore, it is necessary to provide a fault positioning method, device and computer equipment to improve the accuracy of fault positioning.

[0005] In a first aspect, the present application provides a fault positioning method, comprising:

[0006] Obtaining voltage sag recording data collected by a plurality of fault recording devices in a power transmission circuit at corresponding monitoring points; each fault recording device is of different type;

[0007] Selecting target homologous data matched with the voltage sag recording data from a plurality of initial homologous data; the plurality of initial homologous data are determined based on the start time and duration of the voltage sag recording data;

[0008] Positioning the fault in the power transmission circuit based on the power upstream and downstream list of a plurality of lines in the power transmission circuit relative to each monitoring point and the target homologous data, and determining the fault line in the power transmission circuit.

[0009] In one of the embodiments, positioning the fault in the power transmission circuit based on the power upstream and downstream list of a plurality of lines in the power transmission circuit relative to each monitoring point and the target homologous data, and determining the fault line in the power transmission circuit, comprises:

[0010] Determining first energy data of each monitoring point in the power transmission circuit before voltage sag and second energy data of each monitoring point during voltage sag based on the target homologous data;

[0011] Positioning the fault in the power transmission circuit based on the power upstream and downstream list of a plurality of lines in the power transmission circuit relative to each monitoring point, each first energy data and each second energy data, and determining the fault line in the power transmission circuit.

[0012] In one of the embodiments, the target homologous data includes three-phase voltage data and three-phase current data during the voltage sag;

[0013] Based on the target homologous data, the first energy data of each monitoring point in the power transmission loop before the voltage sag and the second energy data of each monitoring point during the voltage sag are determined, including:

[0014] For any one monitoring point, the sum of the product of each phase voltage data and the corresponding current data of the monitoring point during the voltage sag is calculated to obtain the voltage sag power of the monitoring point;

[0015] Based on the starting time of the voltage sag, the voltage sag power of the monitoring point is integrated to obtain the first energy data of the monitoring point before the voltage sag; and based on the starting time and the ending time of the voltage sag, the voltage sag power of the monitoring point is integrated to obtain the second energy data of the monitoring point during the voltage sag.

[0016] In one of the embodiments, based on the power upstream and downstream list of the plurality of lines in the power transmission loop relative to each monitoring point, each first energy data and each second energy data, the fault in the power transmission loop is located to determine the fault line in the power transmission loop, including:

[0017] Based on the comparison result of the product of any one first energy data and the corresponding second energy data and the preset threshold, the upstream and downstream positions of the fault line relative to each monitoring point are determined;

[0018] According to the power upstream and downstream list of the plurality of lines in the power transmission loop relative to each monitoring point and the upstream and downstream positions of the fault line relative to each monitoring point, the fault in the power transmission loop is located to determine the fault line in the power transmission loop.

[0019] In one of the embodiments, the target homologous data matching the voltage sag recording wave data is selected from the plurality of initial homologous data, including:

[0020] Based on the fault characteristic phase in the voltage sag recording wave data, the candidate homologous data matching the voltage sag recording wave data is selected from the plurality of initial homologous data;

[0021] The similarity distance of the voltage sag recording wave data and each candidate homologous data is calculated, and the target homologous data matching the voltage sag recording wave data is selected from the plurality of initial homologous data.

[0022] In one of the embodiments, based on the fault characteristic phase in the voltage sag recording wave data, the candidate homologous data matching the voltage sag recording wave data is selected from the plurality of initial homologous data, including:

[0023] acquiring the lowest voltage phase in the three-phase voltage data in each initial homologous data;

[0024] If the lowest voltage phase is the same as the fault characteristic phase in the voltage sag recording data, the initial homologous data corresponding to the lowest voltage phase is taken as the candidate homologous data matched with the voltage sag recording data.

[0025] In one embodiment, the similarity distance between the voltage sag recording data and each candidate homologous data is calculated, including:

[0026] The recording amplitude ratio graph of the fault characteristic phase in the voltage sag recording data is calculated, and the candidate amplitude ratio graph of the lowest voltage phase in each candidate homologous data is calculated.

[0027] Based on the coincidence degree between the recording amplitude ratio graph and each candidate amplitude ratio graph, the similarity distance between the voltage sag recording data and each candidate homologous data is determined.

[0028] In one embodiment, the process of obtaining the power upstream and downstream list of the plurality of lines in the power transmission loop with respect to each monitoring point includes:

[0029] The line load data collected by each monitoring point in the power transmission loop before the voltage sag is acquired.

[0030] Based on the line load data, the power of the plurality of lines with respect to each monitoring point is calculated.

[0031] According to the power of the plurality of lines with respect to each monitoring point, the power upstream and downstream list of the plurality of lines in the power transmission loop with respect to each monitoring point is determined.

[0032] In a second aspect, the application also provides a fault positioning device, including:

[0033] The acquisition module is configured to acquire voltage sag recording data collected by a plurality of fault recording devices in a power transmission loop at corresponding monitoring points; each fault recording device is of a different type.

[0034] The screening module is configured to screen target homologous data matched with the voltage sag recording data from a plurality of initial homologous data; the plurality of initial homologous data is determined based on the start time and duration of the voltage sag recording data.

[0035] The positioning module is configured to position a fault in the power transmission loop based on the power upstream and downstream list of the plurality of lines in the power transmission loop with respect to each monitoring point and the target homologous data, and determine a fault line in the power transmission loop.

[0036] In a third aspect, the present application also provides a computer device, comprising a memory and a processor, the memory storing a computer program, and the processor implementing the content of any one of the embodiments of the fault locating method in the first aspect when executing the computer program.

[0037] In a fourth aspect, the present application also provides a computer readable storage medium, which stores a computer program, and the computer program implements the content of any one of the embodiments of the fault locating method in the first aspect when executed by a processor.

[0038] In a fifth aspect, the present application also provides a computer program product, comprising a computer program, and the computer program implements the content of any one of the embodiments of the fault locating method in the first aspect when executed by a processor.

[0039] The above fault locating method, device and computer device, acquire voltage sag recording data collected by a plurality of fault recording devices in a power transmission loop at corresponding monitoring points; each fault recording device is of a different type; target common data matching the voltage sag recording data is selected from a plurality of initial common data; the plurality of initial common data is determined based on a start time and a duration of the voltage sag recording data; and the fault in the power transmission loop is located based on a power upstream and downstream list of a plurality of lines in the power transmission loop relative to each monitoring point and the target common data, to determine a fault line in the power transmission loop. The method can first select common data for voltage sag recording data collected by different types of fault recording devices, select target common data matching the voltage sag recording data, and align the quality of multi-source heterogeneous data. Then, based on the power upstream and downstream list of the plurality of lines in the power transmission loop relative to each monitoring point, the target common data can be more comprehensively analyzed, so that the fault line in the power transmission loop can be accurately determined. BRIEF DESCRIPTION OF DRAWINGS

[0040] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the related art, the drawings needed to be used in the description of the embodiments of the present application or the related art will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the present application, and for those skilled in the art, other related drawings can also be obtained without creative labor.

[0041] Figure 1 An application environment diagram of the fault locating method in an embodiment;

[0042] Figure 2 A flowchart of the fault locating method in an embodiment;

[0043] Figure 3 A schematic diagram of a power transmission loop in an embodiment;

[0044] Figure 4 A flowchart of a fault locating method in an embodiment;

[0045] Figure 5 A flowchart of a fault locating method in an embodiment;

[0046] Figure 6 A flowchart of a fault locating method in an embodiment;

[0047] Figure 7 A flowchart of a fault locating method in an embodiment;

[0048] Figure 8 A flowchart of a fault locating method in an embodiment;

[0049] Figure 9 A flowchart of a fault locating method in an embodiment;

[0050] Figure 10 A flowchart of a fault locating method in an embodiment;

[0051] Figure 11 A flowchart of a fault locating method in an embodiment;

[0052] Figure 12 A structural block diagram of a fault locating device in an embodiment. DETAILED DESCRIPTION

[0053] In order to make the purposes, technical solutions and advantages of the present application clearer, further detailed description will be given to the present application in combination with the drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application, and are not used to limit the present application.

[0054] Before the technical solutions of the present application are described in detail, the background art of the present application will be briefly introduced.

[0055] With the rapid development of high-end manufacturing industry, the economic loss of sensitive load caused by voltage sag is increasing. As one of the main causes of voltage sag, accurate fault locating is beneficial to trace the weak part of the fault and provide theoretical support for improving the power supply quality.

[0056] In the related art, the fault is mainly located by analyzing the fault recording data to determine the short-circuit fault position in the power transmission circuit.

[0057] However, due to the different types of fault recording devices in the power transmission circuit, the quality of the collected fault recording data is uneven, which makes the accuracy of fault locating in the related art not high.

[0058] To address the aforementioned problems, the fault location method, apparatus, and computer equipment provided in this application can fully utilize multi-source heterogeneous data resources to achieve accurate fault location. The technical solution of this application will now be described in detail.

[0059] The fault location method provided in this application embodiment can be applied to, for example, Figure 1 The application environment shown is a computer device that can be a server, personal computer, laptop, smartphone, tablet, mobile phone, etc. This computer device may include a processor, memory, and network interface connected via a system bus or wirelessly. The processor provides computing and control capabilities. The memory may include 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 an environment for the operation of the operating system and computer programs in the non-volatile storage media. The database stores data during the fault location process. The network interface communicates with external terminals via a network connection, and the computer program, when executed by the processor, implements a fault location method.

[0060] In one exemplary embodiment, such as Figure 2 As shown, a fault location method is provided, which can be applied to... Figure 1 Taking a computer device as an example, the explanation includes the following steps S101 to S103. Wherein:

[0061] S101, acquire voltage sag recording data collected by multiple fault recording devices in the transmission circuit at corresponding monitoring points; each fault recording device is of a different type.

[0062] A transmission circuit is a closed electrical path connecting two or more substations or switching stations to achieve power transmission between different sites. A monitoring point can be set up before or after a substation in the transmission circuit to collect voltage sag waveform data at the corresponding location. It should be noted that the fault recording equipment at the monitoring points set up at different substation locations is different, so the collected voltage sag waveform data is multi-source heterogeneous data.

[0063] Figure 3 This is a schematic diagram of the power transmission circuit. As can be seen from the diagram, the power transmission circuit includes five stations: TC, LY, XY, YY, and LD. M1, M2, M3, and M4 are four monitoring points. A fault is simulated on line 3.

[0064] In the embodiment of the present application, when the power transmission loop has a fault, the computer device can send a fault data acquisition instruction to each fault recording device corresponding to the monitoring point. After each fault recording device corresponding to the monitoring point receives the fault data acquisition instruction, the fault recording device sends the fault recording data to the computer device. Alternatively, after each fault recording device corresponding to the monitoring point collects data, the fault recording device reports the collected data to the computer device according to a preset time period. Then, the computer device can determine the voltage sag recording data from the data when the power transmission loop has a fault.

[0065] S102, target homologous data matching the voltage sag recording data is screened from the plurality of initial homologous data; the plurality of initial homologous data is determined based on the start time and the duration of the voltage sag recording data.

[0066] In the embodiment of the present application, it is assumed that the start time of the fault in the power transmission loop is T0, all recording data within 1 minute of (T0-30s, T0+30s) is acquired, and all n recording data can be represented as (X1, X2, …, Xn). n Each waveform data X i (i=1, …, n) contains corresponding A, B, and C three-phase voltage data. Then, according to the duration of the fault, the recording data with the same duration as the initial homologous data is screened from all recording data. It is assumed that the duration of the voltage sag recording is T i , and the duration of the voltage sag of another recording data is T j . If the following formula is satisfied, the recording data is determined to be the homologous data of the voltage sag recording data. The formula can be represented as:

[0067]

[0068] In the embodiment of the present application, the computer device can screen target homologous data matching the voltage sag recording data from the plurality of initial homologous data according to the characteristic information of the voltage sag recording data. Alternatively, the computer device can also input the plurality of initial homologous data and the voltage sag recording data into a classification model, the classification model can classify the plurality of initial homologous data based on the voltage sag recording data, and obtain target homologous data matching the voltage sag recording data.

[0069] S103, based on the power upstream and downstream list of the plurality of lines in the power transmission loop relative to each monitoring point and the target homologous data, the fault in the power transmission loop is located, and the fault line in the power transmission loop is determined.

[0070] The power upstream and downstream list refers to the power upstream and downstream position of the line relative to each monitoring point in the process of running the power transmission loop. For example, the power upstream and downstream list of the line relative to each monitoring point in the process of running the power transmission loop can be represented as: Figure 3For example, the power upstream and downstream list of multiple lines in the power transmission loop relative to each monitoring point can be represented by Table 1.

[0071] Table 1

[0072]

[0073] In the embodiments of the present application, when the target homologous data is acquired, the computer device can analyze the target homologous data to determine the upstream and downstream positions of the homologous data relative to each monitoring point. Then, according to the power upstream and downstream list of each monitoring point and the upstream and downstream positions of each monitoring point, the fault line in the power transmission loop is predicted. Alternatively, the computer device can also input the power upstream and downstream list of multiple lines in the power transmission loop relative to each monitoring point and the target homologous data into the fault locating model, and analyze the line with fault in the power transmission loop through the fault locating model.

[0074] In the above fault locating method, the voltage sag recording data collected by multiple fault recording devices in the power transmission loop at the corresponding monitoring points is acquired; each fault recording device is of different type; the target homologous data matching the voltage sag recording data is selected from multiple initial homologous data; the multiple initial homologous data is determined based on the starting time and duration of the voltage sag recording data; the fault in the power transmission loop is located based on the power upstream and downstream list of multiple lines in the power transmission loop relative to each monitoring point and the target homologous data, and the fault line in the power transmission loop is determined. This method can align the quality of multi-source heterogeneous data by first selecting the target homologous data matching the voltage sag recording data collected by fault recording devices of different types. Then, the target homologous data can be analyzed more comprehensively based on the power upstream and downstream list of multiple lines in the power transmission loop relative to each monitoring point, so as to accurately determine the fault line in the power transmission loop.

[0075] In one embodiment, as shown in Figure 4 the above detailed content of locating the fault in the power transmission loop based on the power upstream and downstream list of multiple lines in the power transmission loop relative to each monitoring point and the target homologous data, and determining the fault line in the power transmission loop, which includes:

[0076] S201, based on the target homologous data, determining the first energy data of each monitoring point in the power transmission loop before voltage sag and the second energy data during voltage sag.

[0077] The energy data refers to the cumulative effect of the power data of each monitoring point before voltage sag and during voltage sag.

[0078] In the embodiments of the present application, the target homologous data includes homologous data of multiple monitoring points. For any one monitoring point, the computer device can calculate power data of the monitoring point according to instantaneous three-phase voltage / current data of the monitoring point. The power data is then integrated to obtain first energy data of the monitoring point before voltage sag and second energy data of the monitoring point during voltage sag.

[0079] In the embodiments of the present application, for any one monitoring point, the computer device can determine the upstream and downstream positions of the fault relative to the monitoring point according to the positive and negative values of the first energy data and the second energy data of the monitoring point. The upstream and downstream positions of the fault relative to each monitoring point are analyzed according to the power upstream and downstream list of the multiple lines in the power transmission loop relative to each monitoring point, so as to infer the fault line in the power transmission loop.

[0080] In the embodiments of the present application, for any one monitoring point, the computer device can determine the upstream and downstream positions of the fault relative to the monitoring point according to the positive and negative values of the first energy data and the second energy data of the monitoring point. The upstream and downstream positions of the fault relative to each monitoring point are analyzed according to the power upstream and downstream list of the multiple lines in the power transmission loop relative to each monitoring point, so as to infer the fault line in the power transmission loop.

[0081] In the above fault positioning method, the first energy data of each monitoring point in the power transmission loop before voltage sag and the second energy data of each monitoring point during voltage sag are determined based on target homologous data. The fault in the power transmission loop is positioned based on the power upstream and downstream list of the multiple lines in the power transmission loop relative to each monitoring point, the first energy data and the second energy data, so as to determine the fault line in the power transmission loop. The energy data of each monitoring point is obtained through the target homologous data, and the fault in the power transmission loop can be further accurately positioned by combining the power upstream and downstream list of the multiple lines in the power transmission loop relative to each monitoring point.

[0082] Suppose that the target homologous data includes three-phase voltage data and three-phase current data during voltage sag. In one embodiment, as shown in FIG. 2, the determination of the first energy data of each monitoring point in the power transmission loop before voltage sag and the second energy data of each monitoring point during voltage sag based on the target homologous data includes: Figure 5

[0083] S301, for any one monitoring point, the sum of the product of each phase voltage data and the corresponding current data of the monitoring point during voltage sag is calculated to obtain the voltage sag power of the monitoring point.

[0084] In the embodiments of the present application, for any one monitoring point, the three-phase voltage of the monitoring point during voltage sag can be expressed as u x , and the three-phase current can be expressed as i x ​, x = A, B, C respectively represent instantaneous three-phase voltage and instantaneous three-phase current. The voltage sag power of the monitoring point can be expressed as:

[0085]

[0086] S302, based on the starting time of the voltage sag, the voltage sag power of the monitoring point is integrated to obtain the first energy data of the monitoring point before the voltage sag; and based on the starting time and the ending time of the voltage sag, the voltage sag power of the monitoring point is integrated to obtain the second energy data of the monitoring point during the voltage sag.

[0087] In the embodiment of the present application, it is assumed that the starting time of the voltage sag is t first, and the first energy data of the monitoring point before the voltage sag is which can be expressed as:

[0088]

[0089] Wherein, P M is the instantaneous power of the monitoring device.

[0090] It is assumed that the ending time of the voltage sag is t end, and the second energy data of the monitoring point during the voltage sag is which can be expressed as:

[0091]

[0092] In the above fault locating method, for any one monitoring point, the sum of the product of each phase voltage data and the corresponding current data of the monitoring point during the voltage sag is calculated to obtain the voltage sag power of the monitoring point; based on the starting time of the voltage sag, the voltage sag power of the monitoring point is integrated to obtain the first energy data of the monitoring point before the voltage sag; and based on the starting time and the ending time of the voltage sag, the voltage sag power of the monitoring point is integrated to obtain the second energy data of the monitoring point during the voltage sag. This method eliminates three-phase imbalance error through phase-by-phase power calculation, and strips off steady-state and fault energy through accurate time period integration, which can ensure the accuracy of energy data of different monitoring points.

[0093] In one embodiment, as Figure 6 shown, for the above locating the fault in the power transmission loop based on the power upstream and downstream list of each line in the power transmission loop relative to each monitoring point, each first energy data and each second energy data, the specific content of determining the fault line in the power transmission loop is introduced, which includes:

[0094] S401, determine the upstream and downstream positions of the fault line relative to each monitoring point based on a comparison result of a product of the first energy data and the corresponding second energy data of any one monitoring point and a preset threshold.

[0095] In the embodiments of the present application, for any one monitoring point, the computer device can multiply the first energy data and the second energy data of the monitoring point to obtain a product result. Then, the product result is compared with the preset threshold, and the upstream and downstream positions of the fault line relative to each monitoring point are determined according to the comparison result. Specifically, taking the preset threshold as 0, the comparison result can include:

[0096]

[0097] S402, locate the fault in the power transmission loop and determine the fault line in the power transmission loop according to the power upstream and downstream list of the multiple lines in the power transmission loop relative to each monitoring point and the upstream and downstream positions of the fault line relative to each monitoring point.

[0098] In the embodiments of the present application, after the upstream and downstream positions of the fault line relative to each monitoring point are obtained, the computer device can combine the power upstream and downstream list of the multiple lines in the power transmission loop relative to each monitoring point and the upstream and downstream positions of the fault line relative to each monitoring point to infer the fault line in the power transmission loop. The upstream and downstream positions of the fault line relative to each monitoring point can be shown by Table 2.

[0099] Table 2

[0100]

[0101] According to the content of Table 2 and the power upstream and downstream list of the multiple lines in the power transmission loop relative to each monitoring point, the fault line can be traced back to line 3. The fault location is the same as the simulated fault location in Table 1, and the fault location is accurate. Figure 2

[0102] In the above fault locating method, the upstream and downstream positions of the fault line relative to each monitoring point are determined based on a comparison result of a product of the first energy data and the corresponding second energy data of any one monitoring point and a preset threshold; the fault in the power transmission loop is located and the fault line in the power transmission loop is determined according to the power upstream and downstream list of the multiple lines in the power transmission loop relative to each monitoring point and the upstream and downstream positions of the fault line relative to each monitoring point. This method can quickly make a preliminary judgment on the upstream and downstream positions of the fault relative to each monitoring point by comparing the energy data product with the threshold. Then, the power upstream and downstream list is associated with the fault position, which can realize accurate locking of the fault line.

[0103] In one embodiment, as Figure 7 ​As shown in the above, the selecting the target homologous data matched with the voltage sag recording wave data from the plurality of initial homologous data includes:

[0104] S501, based on the fault characteristic phase in the voltage sag recording wave data, the candidate homologous data matched with the voltage sag recording wave data is selected from the plurality of initial homologous data.

[0105] Wherein, the fault characteristic phase refers to the phase with the lowest voltage in the three-phase data, for example, the lowest voltage is A phase, and the fault characteristic phase is also A phase.

[0106] In the embodiment of the application, the computer device can compare the three-phase voltage in the voltage sag recording wave data, select the lowest voltage from the three-phase voltage, and take the lowest voltage as the fault characteristic phase. Then, the three-phase voltage in each initial homologous data is compared, the lowest voltage is selected from the three-phase voltage, and the lowest voltage is taken as the homologous fault characteristic phase. The initial homologous data corresponding to the homologous fault characteristic phase same as the fault characteristic phase is taken as the candidate homologous data.

[0107] S502, the similarity distance between the voltage sag recording wave data and each candidate homologous data is calculated, and the target homologous data matched with the voltage sag recording wave data is selected from each candidate homologous data.

[0108] In the embodiment of the application, the computer device can calculate the similarity distance between each homologous data and the voltage sag recording wave data according to the calculation formula of the similarity distance, and take the homologous data with the highest similarity distance as the target homologous data matched with the voltage sag recording wave data.

[0109] In the above fault location method, based on the fault characteristic phase in the voltage sag recording wave data, the candidate homologous data matched with the voltage sag recording wave data is selected from the plurality of initial homologous data; the similarity distance between the voltage sag recording wave data and each candidate homologous data is calculated, and the target homologous data matched with the voltage sag recording wave data is selected from each candidate homologous data. Through the selection process of the fault characteristic phase, the range of homologous data can be narrowed, and on the basis of the small range, the high-precision matching of homologous data can be realized according to the similarity distance, so that the target homologous data matched with the voltage sag recording wave data can be accurately obtained.

[0110] Next, the detailed process of selecting the candidate homologous data matched with the voltage sag recording wave data from the plurality of initial homologous data based on the fault characteristic phase in the voltage sag recording wave data is introduced through an embodiment, as shown in the following Figure 8 The detailed content includes:

[0111] S601, the lowest voltage phase in the three-phase voltage data in each initial homologous data is obtained.

[0112] In the embodiment of the present application, for any one initial homologous data, the computer device can sort the three-phase voltage data in the initial homologous data to obtain the voltage phase with the smallest order, i.e., the lowest voltage phase.

[0113] Since the data of multiple monitoring points are also included in each initial homologous data, for any one initial homologous data, the initial homologous data X i The corresponding three-phase voltage effective value waveform R i is compared, i.e., minR i = min(R ia , R ib , R ic ), and the A phase is selected as the lowest voltage phase.

[0114] S602, if any one lowest voltage phase is the same as the fault characteristic phase in the voltage sag recording wave data, the initial homologous data corresponding to the lowest voltage phase is taken as the candidate homologous data matched with the voltage sag recording wave data.

[0115] In the embodiment of the present application, for any one initial homologous data, the computer device can compare the lowest voltage phase corresponding to the initial homologous data with the fault characteristic phase in the voltage sag recording wave data, if they are the same, the initial homologous data is taken as the candidate homologous data matched with the voltage sag recording wave data. If they are different, the initial homologous data is ignored.

[0116] In the above fault positioning method, the lowest voltage phase in the three-phase voltage data in each initial homologous data is obtained; if any one lowest voltage phase is the same as the fault characteristic phase in the voltage sag recording wave data, the initial homologous data corresponding to the lowest voltage phase is taken as the candidate homologous data matched with the voltage sag recording wave data. The method directly matches the lowest voltage phase of the initial homologous data with the fault characteristic phase, and the essence is to anchor the most critical phase feature of the fault, so as to realize the rapid filtering of the candidate data.

[0117] In one embodiment, as shown in Figure 9 The above calculating the similarity distance of the voltage sag recording wave data and each candidate homologous data includes:

[0118] S701, the recording wave amplitude ratio graph of the fault characteristic phase in the voltage sag recording wave data is calculated, and the candidate amplitude ratio graph of the lowest voltage phase of each candidate homologous data is calculated.

[0119] In the embodiments of the present application, in order to avoid the error introduced by the secondary voltage ratio and rated voltage difference of the fault recording device, the amplitude proportion graph can be used to represent the voltage sag relative amplitude, and the waveform data is processed into a probability value. Specifically, for the voltage sag recording data, the computer device can select the sampling point k s to k e between the sampling points; the maximum value and the minimum value of the data in the segment are calculated, and are denoted as V max and V min respectively; the difference between V max and V min is divided by 10, and the voltage sag amplitude difference is equally divided into 10 subintervals; the total number of sampling points between k s and k e is counted, and is denoted as d all ; the number of sampling points falling into each amplitude interval is counted, and is denoted as d(x), x = 1, 2, …, 10, representing a subinterval in the 10 subintervals, to obtain the sampling point proportion of each amplitude subinterval, and to obtain the recording amplitude proportion graph of the fault characteristic phase. The sampling point proportion can be represented as:

[0120]

[0121] wherein q(x) is the sampling point proportion of the voltage sag effective value in the subinterval x.

[0122] In the same way, the candidate amplitude proportion graph of the lowest voltage phase of each candidate homologous data can be calculated.

[0123] S702, based on the coincidence degree of the recording amplitude proportion graph and each candidate amplitude proportion graph, the similarity distance of the voltage sag recording data and each candidate homologous data is determined.

[0124] wherein the similarity (Bhattacharyya) distance is used to represent the discrete probability distribution of the recording amplitude proportion graph and any one candidate amplitude proportion graph, and has the characteristics of good effect and small calculation amount when used for amplitude proportion graph similarity calculation.

[0125] In the embodiments of the present application, the computer device can calculate the coincidence degree between the amplitude proportion histograms by the Bhattacharyya distance algorithm. The higher the coincidence degree of the recording amplitude proportion graph and any one candidate amplitude proportion graph, the higher the waveform similarity. The specific calculation formula can be represented as:

[0126]

[0127]

[0128] Wherein, q1(x) and q2(x) are the sampling point proportions of the recording wave amplitude proportion graph and any one candidate amplitude proportion graph in a certain amplitude sub-interval x, respectively; β is the Bhattacharyya coefficient, and 0≤β≤1, the greater β is, the higher the coincidence degree between the two amplitude proportion graphs is. And 0≤S≤1, the greater β is, the higher the coincidence degree between the two amplitude proportion graphs is. The homologous data similarity threshold is set as When , it indicates that the voltage sag recording wave data and the candidate homologous data are homologous data.

[0129] In actual operation, the voltage sag recording wave data recorded by a voltage sag fault event of a certain main station is taken as a reference to calculate the Bhattacharyya distance of each voltage sag recording wave data and the candidate homologous data. Based on the threshold, it is determined whether it is homologous data. The recording wave data with a similarity less than the threshold to the voltage sag recording wave data is removed, the remaining recording wave data and the voltage sag event record are matched, and the Figure 2 homologous data of M1, M2, M3, and M4 in the above are screened out. Then, the fault line in the power transmission loop is located.

[0130] In the above fault locating method, the recording wave amplitude proportion graph of the fault characteristic phase in the voltage sag recording wave data is calculated, and the candidate amplitude proportion graph of the lowest voltage phase of each candidate homologous data is calculated; based on the coincidence degree of the recording wave amplitude proportion graph and each candidate amplitude proportion graph, the similarity distance of the voltage sag recording wave data and each candidate homologous data is determined. This method calculates the recording wave amplitude proportion graph of the voltage sag recording wave data and the candidate amplitude proportion graph of each candidate homologous data, respectively, and then determines the similarity distance of the voltage sag recording wave data and each candidate homologous data by the coincidence degree of the two amplitude proportion graphs.

[0131] Next, an embodiment is introduced to the acquisition process of the power upstream and downstream list of each line relative to each monitoring point in the power transmission loop, as shown in Figure 10 , the acquisition process includes:

[0132] S801, acquiring the line load data collected by each monitoring point in the power transmission loop before voltage sag.

[0133] In this embodiment, the computer device can send a data acquisition command to the fault recording device corresponding to each monitoring point. After receiving the data acquisition command, the fault recording device corresponding to each monitoring point sends the collected line load data to the computer device. Alternatively, after collecting data, the fault recording device corresponding to each monitoring point will report the collected line load data to the computer device according to a preset time period. Thus, the computer device can obtain the line load data collected by each monitoring point in the transmission circuit before the voltage dip.

[0134] S802 calculates the power of multiple lines relative to each monitoring point based on the load data of each line.

[0135] In this embodiment, after acquiring the load data for each line, since each line load data includes three-phase voltage and three-phase current, for any given monitoring point, the computer device can calculate the sum of the products of each phase voltage data and the corresponding current data during the voltage sag period to obtain the power of the monitoring point.

[0136] S803 determines the upstream and downstream power list of multiple lines in the transmission circuit relative to each monitoring point based on the power of multiple lines relative to each monitoring point.

[0137] In this embodiment of the application, for any given monitoring point, the computer device can determine whether the power of that monitoring point is greater than 0. If it is greater than 0, it indicates that the line is upstream of the power of that monitoring point; if it is less than 0, it indicates that the line is downstream of the power of that monitoring point. Specifically, this can be expressed as:

[0138]

[0139] in, This refers to the power data of the i-th line connected to the monitoring point before the fault. When line i supplies power to the monitoring point... If line i is upstream of the power of the monitoring point, then line i is downstream of the power of the monitoring point. After traversing all lines connected to the monitoring point, a list of upstream and downstream power of multiple lines in the transmission circuit relative to each monitoring point is obtained.

[0140] In the fault locating method, line load data collected by each monitoring point in the power transmission loop before voltage sag is obtained; power of multiple lines relative to each monitoring point is calculated based on the line load data; and power upstream and downstream list of the multiple lines relative to each monitoring point in the power transmission loop is determined according to the power of the multiple lines relative to each monitoring point. The method can calculate the power of each line at each monitoring point under the condition of no fault based on the line load data collected before voltage sag, and can accurately determine the upstream and downstream of the line relative to each monitoring point based on the power of each monitoring point, thereby accurately generating the power upstream and downstream list of the multiple lines relative to each monitoring point in the power transmission loop.

[0141] In one detailed embodiment, as shown in Figure 11 the fault locating method comprises:

[0142] S901, voltage sag recording data collected by multiple fault recording devices in a power transmission loop at corresponding monitoring points is obtained;

[0143] S902, the lowest voltage phase in three-phase voltage data in each initial homologous data is obtained;

[0144] S903, if any one of the lowest voltage phases is the same as the fault characteristic phase in the voltage sag recording data, the initial homologous data corresponding to the lowest voltage phase is taken as the candidate homologous data matched with the voltage sag recording data;

[0145] S904, a recording amplitude ratio graph of the fault characteristic phase in the voltage sag recording data is calculated, and a candidate amplitude ratio graph of the lowest voltage phase of each candidate homologous data is calculated;

[0146] S905, based on the coincidence degree of the recording amplitude ratio graph and each candidate amplitude ratio graph, the similarity distance between the voltage sag recording data and each candidate homologous data is determined;

[0147] S906, for any one monitoring point, the sum of the product of each phase voltage data and the corresponding current data of the monitoring point during voltage sag is calculated to obtain the voltage sag power of the monitoring point;

[0148] S907, based on the starting time of voltage sag, the voltage sag power of the monitoring point is integrated to obtain the first energy data of the monitoring point before voltage sag; and based on the starting time and the ending time of voltage sag, the voltage sag power of the monitoring point is integrated to obtain the second energy data of the monitoring point during voltage sag;

[0149] S908, based on the comparison result of the product of any one first energy data and the corresponding second energy data and the preset threshold, the upstream and downstream positions of the fault line relative to each monitoring point are determined.

[0150] S909, positioning the fault in the power transmission loop based on the power upstream and downstream list of the plurality of lines in the power transmission loop relative to the respective monitoring points and the upstream and downstream position of the fault line relative to the respective monitoring points, and determining the fault line in the power transmission loop.

[0151] It should be understood that although each step in the flowchart involved in the above embodiments is shown in sequence according to the arrow, these steps are not necessarily executed in the order indicated by the arrow. Unless otherwise specified herein, the execution of these steps is not strictly limited in sequence, and these steps can be executed in other orders. Moreover, at least part of the steps in the flowchart involved in the above embodiments can include multiple steps or stages, which are not necessarily executed at the same time, but can be executed at different times, and the execution order of these steps or stages is not necessarily sequential, but can be executed alternately or alternately with at least part of other steps or steps or stages in other steps.

[0152] Based on the same inventive concept, the embodiments of the present application also provide a fault positioning device for implementing the above-mentioned fault positioning method. The implementation scheme for solving the problem provided by the device is similar to the implementation scheme described in the above method, and therefore the specific limitations in one or more fault positioning device embodiments provided below can refer to the limitations of the fault positioning method described above, which will not be repeated here.

[0153] In one exemplary embodiment, as shown in Figure 12 A fault positioning device is provided, comprising: an acquisition module 11, a screening module 12 and a positioning module 13, wherein:

[0154] The acquisition module 11 is configured to acquire voltage sag recording data collected by a plurality of fault recording devices in a power transmission loop at corresponding monitoring points; each fault recording device is of a different type;

[0155] The screening module 12 is configured to screen target isochronous data matching the voltage sag recording data from a plurality of initial isochronous data; the plurality of initial isochronous data is determined based on the start time and duration of the voltage sag recording data;

[0156] The positioning module 13 is configured to position the fault in the power transmission loop based on the power upstream and downstream list of the plurality of lines in the power transmission loop relative to the respective monitoring points and the target isochronous data, and determine the fault line in the power transmission loop.

[0157] In one exemplary embodiment, the above positioning module 13 comprises a data determination unit and a positioning unit, wherein:

[0158] The data determination unit is used to determine the first energy data of each monitoring point in the transmission circuit before the voltage dip and the second energy data during the voltage dip, based on the target homogeneous data.

[0159] The location unit is used to locate faults in the power transmission circuit based on the upstream and downstream power lists of multiple lines in the power transmission circuit relative to each monitoring point, each first energy data and each second energy data, and to identify the faulty line in the power transmission circuit.

[0160] In an exemplary embodiment, the data determination unit is further configured to, for any monitoring point, calculate the sum of the products of each phase voltage data and the corresponding current data during the voltage sag period to obtain the voltage sag power of the monitoring point; perform integration processing on the voltage sag power of the monitoring point based on the start time of the voltage sag to obtain the first energy data of the monitoring point before the voltage sag; and perform integration processing on the voltage sag power of the monitoring point based on the start time and end time of the voltage sag to obtain the second energy data of the monitoring point during the voltage sag period.

[0161] In an exemplary embodiment, the positioning unit is further configured to determine the upstream and downstream positions of the faulty line relative to each monitoring point based on the comparison result of the product of any first energy data and the corresponding second energy data with a preset threshold; and to locate the fault in the transmission circuit and determine the faulty line in the transmission circuit based on the upstream and downstream power list of multiple lines in the transmission circuit relative to each monitoring point and the upstream and downstream positions of the faulty line relative to each monitoring point.

[0162] In an exemplary embodiment, the above-mentioned filtering module includes: a first filtering unit and a second filtering unit, wherein:

[0163] The first screening unit is used to select candidate source data that matches the voltage sag waveform data from multiple initial source data based on the fault characteristic phase in the voltage sag waveform data.

[0164] The second screening unit is used to calculate the similarity distance between the voltage sag waveform data and each candidate source data, and to screen out the target source data that matches the voltage sag waveform data from each candidate source data.

[0165] In an exemplary embodiment, the first screening unit is further configured to obtain the lowest voltage phase among the three-phase voltage data in each initial source data; if any lowest voltage phase is the same as the fault characteristic phase in the voltage sag recording data, then the initial source data corresponding to the lowest voltage is used as the candidate source data that matches the voltage sag recording data.

[0166] In an example embodiment, the second screening unit is further configured to calculate a recording amplitude ratio graph of the fault characteristic phase in the voltage sag recording data, and calculate a candidate amplitude ratio graph of the lowest voltage phase of each candidate homologous data; and determine the similarity distance between the voltage sag recording data and each candidate homologous data based on the coincidence degree of the recording amplitude ratio graph and each candidate amplitude ratio graph.

[0167] In an example embodiment, the fault locating device further comprises a load data acquisition module, a calculation module and a list determination module, wherein:

[0168] The load data acquisition module is configured to acquire line load data of each monitoring point in the power transmission circuit before voltage sag;

[0169] The calculation module is configured to calculate the power of multiple lines with respect to each monitoring point based on the line load data.

[0170] The list determination module is configured to determine the power upstream and downstream list of multiple lines with respect to each monitoring point in the power transmission circuit according to the power of multiple lines with respect to each monitoring point.

[0171] Each module in the fault locating device can be realized by software, hardware and a combination thereof in whole or in part. Each module can be embedded in or independent of the processor in the computer device in hardware form, or stored in the memory in the computer device in software form, so as to be called and executed by the processor to perform the operations corresponding to each module.

[0172] In an example embodiment, a computer device is provided, comprising a memory and a processor, the memory stores a computer program, and the processor executes the computer program to realize the content of any one of the above-mentioned fault locating methods.

[0173] In an embodiment, a computer readable storage medium is provided, which stores a computer program, and the computer program is executed by a processor to realize the content of any one of the above-mentioned fault locating methods.

[0174] In an embodiment, a computer program product is provided, which comprises a computer program, and the computer program is executed by a processor to realize the content of any one of the above-mentioned fault locating methods.

[0175] It should be noted that the user information (including but not limited to user equipment information, user personal information, etc.) and data (including but not limited to data for analysis, stored data, displayed data, etc.) involved in the present application are all information and data authorized by the user or authorized by all parties, and the collection, use and processing of related data need to comply with relevant regulations.

[0176] Those skilled in the art can understand that all or part of the processes in the above-mentioned embodiment methods can be completed by instructing the relevant hardware through a computer program. The computer program can be stored in a non-volatile computer readable storage medium, and when executed, can include the processes of the above-mentioned embodiment methods. Any reference to memory, database or other medium used in the embodiments provided by the present application can include at least one of non-volatile memory and volatile memory. The non-volatile memory can include read-only memory (ROM), magnetic tape, floppy disk, flash memory, optical storage, high-density embedded non-volatile memory, resistive random access memory (ReRAM), magnetoresistive random access memory (MRAM), ferroelectric random access memory (FRAM), phase change memory (PCM), graphene memory, etc. The volatile memory can include random access memory (RAM) or external cache memory, etc. As an illustration but not limitation, the RAM can be in various forms, such as static random access memory (SRAM) or dynamic random access memory (DRAM), etc. The database involved in the embodiments provided by the present application can include at least one of a relational database and a non-relational database. The non-relational database can include a distributed database based on a block chain, etc., without being limited thereto. The processor involved in the embodiments provided by the present application can be a general-purpose processor, a central processing unit, a graphics processing unit, a digital signal processor, a programmable logic device, a data processing logic device based on quantum computing, an artificial intelligence (AI) processor, etc., without being limited thereto.

[0177] The technical features of the above embodiments can be combined in any manner. To make the description concise, not all possible combinations of the technical features in the above embodiments are described, but as long as the combinations of the technical features do not exist, they should be considered as the scope of the present application.

[0178] The above embodiments only express several implementation ways of the present application, and the description is specific and detailed, but it should not be understood as a limitation to the patent scope of the present application. It should be pointed out that for ordinary skilled in the art, without departing from the concept of the present application, several modifications and improvements can be made, which all belong to the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the appended claims.

Claims

1. A fault location method characterized by, The method comprises: acquiring voltage sag recording data collected by a plurality of fault recording devices in a power transmission loop at corresponding monitoring points; each fault recording device is of a different type; selecting target homologous data matching the voltage sag recording data from a plurality of initial homologous data; the plurality of initial homologous data are determined based on a starting time and a duration of the voltage sag recording data; locating a fault in the power transmission loop based on a power upstream and downstream list of a plurality of lines in the power transmission loop relative to each monitoring point and the target homologous data, and determining a fault line in the power transmission loop.

2. The method of claim 1, wherein, The locating of the fault in the power transmission loop based on the power upstream and downstream list of the plurality of lines in the power transmission loop relative to each monitoring point and the target homologous data, and the determination of the fault line in the power transmission loop, comprise: determining, based on the target homologous data, first energy data of each monitoring point in the power transmission loop before voltage sag and second energy data of each monitoring point during voltage sag; locating the fault in the power transmission loop based on the power upstream and downstream list of the plurality of lines in the power transmission loop relative to each monitoring point, each first energy data and each second energy data, and determining the fault line in the power transmission loop.

3. The method of claim 2, wherein, The target homologous data comprise three-phase voltage data and three-phase current data during voltage sag; The determination of the first energy data of each monitoring point in the power transmission loop before voltage sag and the second energy data of each monitoring point during voltage sag based on the target homologous data, comprises: for any one monitoring point, calculating a sum of products of each-phase voltage data and corresponding current data of the monitoring point during voltage sag to obtain voltage sag power of the monitoring point; based on a starting time of voltage sag, performing integral processing on the voltage sag power of the monitoring point to obtain the first energy data of the monitoring point before voltage sag, and based on the starting time and an ending time of voltage sag, performing integral processing on the voltage sag power of the monitoring point to obtain the second energy data of the monitoring point during voltage sag.

4. The method of claim 2, wherein, The locating of the fault in the power transmission loop based on the power upstream and downstream list of the plurality of lines in the power transmission loop relative to each monitoring point, each first energy data and each second energy data, and the determination of the fault line in the power transmission loop, comprise: determining upstream and downstream positions of the fault line relative to each monitoring point based on a comparison result of a product of any one first energy data and corresponding second energy data and a preset threshold; locating the fault in the power transmission loop according to the power upstream and downstream list of the plurality of lines in the power transmission loop relative to each monitoring point and the upstream and downstream positions of the fault line relative to each monitoring point, and determining the fault line in the power transmission loop.

5. The method according to any one of claims 1 to 4, characterized in that, The selection of the target homologous data from the plurality of initial homologous data matching the voltage sag recording data, comprises: selecting candidate homologous data matching the voltage sag recording data from the plurality of initial homologous data based on a fault feature phase in the voltage sag recording data; The similarity distance of the voltage sag recorded wave data and each of the candidate homologous data is calculated, and target homologous data matching the voltage sag recorded wave data is screened from each of the candidate homologous data.

6. The method of claim 5, wherein, The candidate homologous data matching the voltage sag recorded wave data is screened from the plurality of initial homologous data based on the fault characteristic phase in the voltage sag recorded wave data, and the method comprises the following steps of: The lowest voltage phase in the three-phase voltage data in each initial homologous data is obtained. If any one of the lowest voltage phases is the same as the fault characteristic phase in the voltage sag recorded wave data, the initial homologous data corresponding to the lowest voltage phase is taken as the candidate homologous data matching the voltage sag recorded wave data.

7. The method of claim 5, wherein, The similarity distance of the voltage sag recorded wave data and each of the candidate homologous data is calculated, and the method comprises the following steps of: The recorded wave amplitude proportion graph of the fault characteristic phase in the voltage sag recorded wave data is calculated, and the candidate amplitude proportion graph of the lowest voltage phase in each of the candidate homologous data is calculated. The similarity distance of the voltage sag recorded wave data and each of the candidate homologous data is determined based on the coincidence degree of the recorded wave amplitude proportion graph and each of the candidate amplitude proportion graphs.

8. The method according to any one of claims 1 to 4, characterized in that, The process of obtaining the power upstream and downstream list of the plurality of lines relative to each monitoring point in the power transmission loop comprises the following steps of: The line load data collected by each monitoring point in the power transmission loop before voltage sag is obtained. The power of the plurality of lines relative to each monitoring point is calculated based on the line load data. The power upstream and downstream list of the plurality of lines relative to each monitoring point in the power transmission loop is determined according to the power of the plurality of lines relative to each monitoring point.

9. A fault location device characterized by, The device comprises: An obtaining module is configured to obtain voltage sag recorded wave data collected by a plurality of fault recorded wave devices in a power transmission loop at corresponding monitoring points; each fault recorded wave device is of a different type; A screening module is configured to screen target homologous data matching the voltage sag recorded wave data from a plurality of initial homologous data; the plurality of initial homologous data is determined based on the starting time and duration of the voltage sag recorded wave data; A positioning module is configured to position a fault in the power transmission loop based on the power upstream and downstream list of the plurality of lines relative to each monitoring point in the power transmission loop and the target homologous data, and determine a fault line in the power transmission loop. 10.A computer device, comprising a memory and a processor, wherein the memory stores a computer program, and the computer device is configured to perform the method according to any one of claims 1-9. The processor implements the steps of the method of any one of claims 1 to 8 when executing the computer program.

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