Error monitoring method, device and equipment for capacitor voltage transformer, storage medium and program product

Abstract

The invention relates to an error monitoring method and device for a capacitor voltage transformer, equipment, a storage medium and a program product. The method comprises the following steps: acquiring a plurality of three-phase voltage signals in a preset time period, and calculating corresponding voltage three-phase vectors and coordinates; determining a clustering center according to the voltage three-phase vector and the coordinates; sorting the voltage three-phase vectors and coordinates according to the distance between each voltage three-phase vector and coordinate and the clustering center; determining boundary point coordinates according to a sorting result; determining a circular boundary area according to the clustering center and the boundary point coordinates; calculating a long axis and a short axis according to the clustering center and the boundary point coordinates, and determining a rectangular boundary region based on the long axis and the short axis; and based on the circular boundary region and the rectangular boundary region, performing out-of-tolerance judgment on the current voltage three-phase vector and coordinates to obtain an error monitoring result. By adopting the method, the stability of the three-phase voltage in the power system can be accurately judged, and safe and stable operation of the power system is guaranteed.

Description

Technical Field

[0001] The present application relates to the technical field of power systems, and in particular to a method, device, electronic device, computer-readable storage medium, and computer program product for error monitoring of a capacitor voltage transformer. Background Art

[0002] Capacitor voltage transformers (CVTs) play a crucial role in power systems, with their performance directly impacting the accuracy of voltage measurements and the stability of the entire system. Currently, CVT error monitoring systems rely heavily on periodic offline calculations, making it difficult to capture transient anomalies in a timely manner. This lag can result in the inability to detect abnormalities caused by potential faults. Furthermore, environmental factors such as temperature, humidity, and mechanical vibration can significantly impact CVT measurement performance. Traditional devices often use fixed compensation coefficients, making them unable to adapt to dynamic environmental changes. This is particularly true in new energy stations, where power fluctuations exacerbate the coupling effect between CVT errors and environmental factors, further increasing CVT monitoring errors. Summary of the Invention

[0003] Based on this, it is necessary to provide an error monitoring method, device, electronic device, computer-readable storage medium and computer program product for a capacitor voltage transformer to address the above technical problems, which can accurately judge the stability of the three-phase voltage in the power system and ensure the safe and stable operation of the power system.

[0004] In a first aspect, the present application provides a method for monitoring an error of a capacitor voltage transformer, comprising:

[0005] Collect multiple three-phase voltage signals within a preset time period, and calculate the voltage three-phase vectors and coordinates corresponding to the multiple three-phase voltage signals;

[0006] Determine a cluster center according to the voltage three-phase vectors and coordinates corresponding to the multiple three-phase voltage signals;

[0007] sorting the voltage three-phase vectors and coordinates corresponding to the multiple three-phase voltage signals according to the distance between each voltage three-phase vector and coordinate and the cluster center;

[0008] Determine the coordinates of the boundary points according to the sorting results;

[0009] Determine the circular boundary area based on the cluster center and boundary point coordinates;

[0010] According to the coordinates of the cluster center and the boundary point, the major axis and the minor axis are calculated, and based on the major axis and the minor axis, the rectangular boundary area is determined;

[0011] Based on the circular boundary area and the rectangular boundary area, the voltage three-phase vector and coordinates corresponding to the current three-phase voltage signal are judged to be out of tolerance, and the error monitoring result is obtained.

[0012] In one embodiment, the three-phase voltage signal includes a first phase voltage, a second phase voltage, and a third phase voltage, and the voltage three-phase vector and coordinates are calculated using the following formula:

[0013] ;

[0014] Among them, (x, y) represents the voltage three-phase vector and coordinates, represents the amplitude of the first phase voltage, represents the phase of the first phase voltage, represents the amplitude of the second phase voltage, represents the phase of the second phase voltage, represents the amplitude of the third phase voltage, Indicates the phase of the third-phase voltage.

[0015] In one embodiment, determining the coordinates of the boundary points according to the sorting results includes:

[0016] According to the set limit, select several voltage three-phase vectors and coordinates with the highest order from the results sorted from smallest to largest distance;

[0017] The voltage three-phase vector and coordinates with the largest distance from the cluster center among the selected voltage three-phase vectors and coordinates are determined as the boundary point coordinates.

[0018] In one embodiment, calculating the major axis and the minor axis according to the coordinates of the cluster center and the boundary point, and determining the rectangular boundary area based on the major axis and the minor axis includes:

[0019] Calculating the first slope and the first intercept according to the cluster center and the boundary point coordinates, determining the major axis according to the first slope and the first intercept, and determining the distance between the boundary point coordinates and the cluster center as the semi-major axis;

[0020] Determine a second slope and a second intercept according to the cluster center and the first slope, and determine a minor axis according to the second slope and the second intercept;

[0021] Calculate the distance between the sum coordinates of each voltage three-phase vector and the long axis within the set range;

[0022] The calculated maximum distance is determined as the semi-minor axis;

[0023] Determine the rectangular boundary area based on the major axis, semi-major axis, minor axis, and semi-minor axis.

[0024] In one embodiment, based on the circular boundary area and the rectangular boundary area, the voltage three-phase vector and coordinates corresponding to the current three-phase voltage signal are judged to be out of tolerance, and the error monitoring results are obtained, including:

[0025] If the voltage three-phase vector and coordinates corresponding to the current three-phase voltage signal exceed the circular boundary area or the rectangular boundary area, it is determined that the error monitoring result is that there is an error in the capacitor voltage transformer;

[0026] If the voltage three-phase vector and coordinates corresponding to the current three-phase voltage signal do not exceed the circular boundary area and the rectangular boundary area, it is determined that the error monitoring result is that there is no error in the capacitor voltage transformer.

[0027] In one embodiment, based on the circular boundary area and the rectangular boundary area, the voltage three-phase vector and coordinates corresponding to the current three-phase voltage signal are judged to be out of tolerance, and the error monitoring results are obtained, including:

[0028] When the ratio between the semi-major axis of the major axis and the semi-minor axis of the minor axis is less than a preset threshold, the voltage three-phase vector and coordinates corresponding to the current three-phase voltage signal are judged as out-of-tolerance according to the circular boundary area to obtain the error monitoring result;

[0029] When the ratio between the semi-major axis of the major axis and the semi-minor axis of the minor axis is greater than or equal to the preset threshold, the voltage three-phase vector and coordinates corresponding to the current three-phase voltage signal are judged as out-of-tolerance according to the rectangular boundary area to obtain the error monitoring result.

[0030] In a second aspect, the present application further provides an error monitoring device for a capacitor voltage transformer, comprising:

[0031] A data acquisition module is used to collect multiple three-phase voltage signals within a preset time period and calculate the voltage three-phase vectors and coordinates corresponding to the multiple three-phase voltage signals;

[0032] a data processing module for determining a cluster center based on the voltage three-phase vectors and coordinates corresponding to the multiple three-phase voltage signals; sorting the voltage three-phase vectors and coordinates corresponding to the multiple three-phase voltage signals based on the distance between each voltage three-phase vector and coordinate and the cluster center; and determining the coordinates of the boundary points based on the sorting results;

[0033] A boundary determination module is used to determine a circular boundary area based on the coordinates of the cluster center and the boundary point; calculate the major axis and the minor axis based on the coordinates of the cluster center and the boundary point, and determine a rectangular boundary area based on the major axis and the minor axis;

[0034] The judgment module is used to perform out-of-tolerance judgment on the voltage three-phase vector and coordinates corresponding to the current three-phase voltage signal based on the circular boundary area and the rectangular boundary area to obtain the error monitoring result.

[0035] In a third aspect, the present application further provides an electronic device comprising a memory and a processor, wherein the memory stores a computer program, and the processor implements the steps of the method described in the first aspect above when executing the computer program.

[0036] In a fourth aspect, the present application further provides a computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, implements the steps of the method described in the first aspect above.

[0037] In a fifth aspect, the present application also provides a computer program product, comprising a computer program, which, when executed by a processor, implements the steps of the method described in the first aspect above.

[0038] The error monitoring method, device, electronic device, computer-readable storage medium, and computer program product of the capacitor voltage transformer described above collect multiple three-phase voltage signals within a preset time period, calculate the voltage three-phase vectors and coordinates corresponding to the multiple three-phase voltage signals respectively; determine the cluster center based on the voltage three-phase vectors and coordinates corresponding to the multiple three-phase voltage signals respectively; sort the voltage three-phase vectors and coordinates corresponding to the multiple three-phase voltage signals respectively according to the distance between each voltage three-phase vector and coordinate and the cluster center; determine the boundary point coordinates according to the sorting result; determine the circular boundary area according to the cluster center and the boundary point coordinates; calculate the major axis and minor axis according to the cluster center and the boundary point coordinates, and determine the rectangular boundary area based on the major axis and minor axis; and perform an out-of-tolerance judgment on the voltage three-phase vector and coordinates corresponding to the current three-phase voltage signal based on the circular boundary area and the rectangular boundary area to obtain an error monitoring result. By the above method, the voltage three-phase vector and coordinates are accurately calculated and the steady-state control domain of the CVT is accurately divided, which can more accurately reflect the stable range of the three-phase voltage of the power system. Based on the accurately delineated circular and rectangular boundary areas, out-of-tolerance judgment can reduce misjudgments and missed judgments, helping to promptly detect anomalies in the power system. This provides a reliable basis for fault diagnosis and maintenance, effectively ensuring the safe and stable operation of the power system. This method is of great significance for the stable operation and fault prevention of power systems. It has the advantages of simple operation, strong adaptability, and high accuracy, and is suitable for monitoring needs of various power systems. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] In order to more clearly illustrate the technical solutions in the embodiments of the present application or related technologies, the following briefly introduces the drawings required for use in the embodiments of the present application or related technical descriptions. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying any creative work.

[0040] Figure 1 1 is a flow chart of a method for monitoring an error of a capacitor voltage transformer according to an embodiment;

[0041] Figure 2 A schematic diagram of constructing a boundary area in one embodiment;

[0042] Figure 3 is a structural block diagram of an error monitoring device for a capacitor voltage transformer in one embodiment;

[0043] Figure 4 FIG. 1 is a diagram showing the internal structure of an electronic device in one embodiment. DETAILED DESCRIPTION

[0044] In order to make the purpose, technical solutions and advantages of this application more clear, the following further describes this application in detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain this application and are not intended to limit this application.

[0045] In an exemplary embodiment, as shown in the figure, a method for monitoring an error of a capacitor voltage transformer is provided. This embodiment uses the method applied to an electronic device as an example for illustration. The method includes the following steps:

[0046] Step 102 : collecting a plurality of three-phase voltage signals within a preset time period, and calculating voltage three-phase vectors and coordinates corresponding to the plurality of three-phase voltage signals.

[0047] The electronic device is communicatively connected to a capacitor voltage transformer (CVT) secondary-side voltage sensor, and synchronously collects three-phase voltage signals via the voltage sensor. Optionally, the electronic device employing the capacitor voltage transformer error monitoring method provided in this embodiment collects the three-phase voltage signals at regular intervals and updates the range of the steady-state control domain (i.e., the circular boundary region and the rectangular boundary region) based on multiple three-phase voltage signals within a certain time period.

[0048] The preset time period refers to a pre-agreed time range and can be adjusted according to actual needs, such as within the past day, within the past week, within the past month, etc. This embodiment does not limit the specific value. For example, a voltage sensor collects multiple three-phase voltage signals within a day, calculates multiple voltage three-phase vectors and coordinates, and forms a voltage three-phase vector and data set. Figure 2 , each voltage three-phase vector and coordinate can be understood as a point in the coordinate system.

[0049] Step 104 : determining a cluster center according to the voltage three-phase vectors and coordinates corresponding to the plurality of three-phase voltage signals.

[0050] In a specific implementation, based on multiple voltage three-phase vectors and coordinates, the meanshift method or the centroid calculation formula can be used to determine the cluster center. Taking the centroid calculation formula as an example, the following formula is used to calculate the cluster center :

[0051] ;

[0052] Where n represents the total number of voltage three-phase vectors and coordinates, represents the x coordinate in the i-th voltage three-phase vector and coordinates, Represents the y coordinate of the i-th voltage three-phase vector and coordinates.

[0053] It is understandable that other clustering algorithms may also be used, and this embodiment does not limit this.

[0054] Step 106 : sorting the voltage three-phase vectors and coordinates corresponding to the plurality of three-phase voltage signals according to the distance between each voltage three-phase vector and coordinate and the cluster center.

[0055] In the specific implementation, the distance between each voltage three-phase vector and coordinate and the cluster center can be calculated according to the following formula :

[0056] ;

[0057] in, represents the cluster center, Represents the three-phase vector and coordinates of the i-th voltage.

[0058] It is understandable that the multiple voltage three-phase vectors and coordinates may be sorted in ascending order based on the distance from the cluster center, or in descending order based on the distance from the cluster center.

[0059] Step 108: Determine the coordinates of the boundary points according to the sorting results.

[0060] Optionally, the first N points are selected according to the sorting result, and the coordinates corresponding to the Nth point are determined as the boundary point coordinates; N can be a fixed parameter or can be dynamically calculated according to the point distribution.

[0061] In one optional implementation, multiple voltage three-phase vectors and coordinates are sorted in descending order based on their distance from the cluster center. Based on a set limit, several voltage three-phase vectors and coordinates with the lowest distance from the cluster center are selected from the sorted results. Among the selected voltage three-phase vectors and coordinates, the one with the smallest distance from the cluster center is determined as the boundary point coordinate. The set limit refers to a pre-set distance threshold or ratio parameter, for example, selecting 1% of the voltage three-phase vectors and coordinates from the largest to the smallest.

[0062] In one optional implementation, multiple voltage three-phase vectors and coordinates are sorted in ascending order based on their distance from the cluster center. Based on a set limit, several voltage three-phase vectors and coordinates with the highest distance from the cluster center are selected from the sorted results. Among the selected voltage three-phase vectors and coordinates, the one with the largest distance from the cluster center is determined as the boundary point coordinate. The set limit refers to a pre-set distance threshold or ratio parameter, for example, selecting 99% of the voltage three-phase vectors and coordinates from the smallest to the largest.

[0063] Step 110: Determine the circular boundary area based on the cluster center and the boundary point coordinates.

[0064] Among them, reference Figure 2 , with cluster centers As the center of the circle, with the coordinates of the boundary point and The distance R L is the radius, determining the circular boundary area.

[0065] Step 112 : Calculate the major axis and the minor axis according to the cluster center and the coordinates of the boundary points, and determine the rectangular boundary area based on the major axis and the minor axis.

[0066] The circular boundary area and the rectangular boundary area refer to the steady-state control domain, which are used to characterize the stable range of the three-phase voltage of the power system.

[0067] Step 114 : Based on the circular boundary area and the rectangular boundary area, an out-of-tolerance determination is performed on the voltage three-phase vector and coordinates corresponding to the current three-phase voltage signal to obtain an error monitoring result.

[0068] Among them, the current three-phase voltage signal refers to the data collected in real time by the voltage sensor. The new voltage three-phase vector and coordinates are judged to be out of tolerance according to the steady-state control domain to obtain the error monitoring result.

[0069] In the error monitoring method of the capacitive voltage transformer, multiple three-phase voltage signals are collected within a preset time period, and the voltage three-phase vectors and coordinates corresponding to the multiple three-phase voltage signals are calculated; the cluster center is determined based on the voltage three-phase vectors and coordinates corresponding to the multiple three-phase voltage signals; the voltage three-phase vectors and coordinates corresponding to the multiple three-phase voltage signals are sorted based on the distance between each voltage three-phase vector and coordinate and the cluster center; the boundary point coordinates are determined based on the sorting result; the circular boundary area is determined based on the cluster center and the boundary point coordinates; the long axis and the short axis are calculated based on the cluster center and the boundary point coordinates, and the rectangular boundary area is determined based on the long axis and the short axis; based on the circular boundary area and the rectangular boundary area, the voltage three-phase vector and coordinates corresponding to the current three-phase voltage signal are judged to be out of tolerance to obtain the error monitoring result. Through the above method, the voltage three-phase vector and coordinates are accurately calculated and the steady-state control domain of the CVT is accurately divided, which can more accurately reflect the stable range of the three-phase voltage of the power system. Out-of-tolerance judgment based on accurately divided circular and rectangular boundary areas can reduce misjudgments and missed judgments, help to promptly detect anomalies in the power system, provide a reliable basis for fault diagnosis and maintenance of the power system, and effectively ensure the safe and stable operation of the power system.

[0070] In an exemplary embodiment, the three-phase voltage signal includes a first-phase voltage, a second-phase voltage, and a third-phase voltage, and the voltage three-phase vector and coordinates are calculated using the following formula:

[0071] ;

[0072] Among them, (x, y) represents the voltage three-phase vector and coordinates, represents the amplitude of the first phase voltage, represents the phase of the first phase voltage, represents the amplitude of the second phase voltage, represents the phase of the second phase voltage, represents the amplitude of the third phase voltage, Indicates the phase of the third-phase voltage.

[0073] In an exemplary embodiment, step 108 includes: selecting, according to a set limit value, several voltage three-phase vectors and coordinates that are ranked higher from the results of sorting the distance from small to large; and determining the voltage three-phase vector and coordinates with the largest distance from the cluster center among the selected several voltage three-phase vectors and coordinates as the boundary point coordinates.

[0074] The set limit refers to the distance threshold or ratio parameter set in advance. Assuming the set limit is 99%, according to the distance Sort by selecting 99% of the points from small to large to divide the range and locate the boundary point coordinates In this way, the interference of outliers or noise points can be eliminated, thereby improving the accuracy of the divided steady-state control domain.

[0075] In an exemplary embodiment, step 112 includes: calculating a first slope and a first intercept based on the cluster center and the boundary point coordinates, determining the major axis based on the first slope and the first intercept, and determining the distance between the boundary point coordinates and the cluster center as the semi-major axis; determining a second slope and a second intercept based on the cluster center and the first slope, and determining the minor axis based on the second slope and the second intercept; calculating the distance between each voltage three-phase vector and coordinate within a set range and the major axis; determining the calculated maximum distance as the semi-minor axis; and determining a rectangular boundary area based on the major axis, the semi-major axis, the minor axis, and the semi-minor axis.

[0076] Among them, reference Figure 2 , the major axis passes through the formula To express, is the first slope, is the first intercept. According to the cluster center and boundary point coordinates , calculated by the following formula and :

[0077] ;

[0078] The boundary point coordinates and cluster centers The distance R L Determined as the semi-major axis.

[0079] The minor axis passes through the formula According to the cluster center and the first slope , the second slope is calculated by the following formula and the second intercept :

[0080] ;

[0081] The setting range refers to the circular range with the cluster center as the center and R as the radius. R can be set to R L , or other values. The long axis is represented by , the coordinates of the point are , calculate the distance from all points within the set range to the long axis using the following formula:

[0082] ;

[0083] Determine the point with the largest distance from the guide axis among all points within the set range , and the distance R from this point to the long axis S Determined as the semi-minor axis.

[0084] Reference Figure 2 , according to the long axis , semi-major axis R L , short axis 、Semi-minor axis R S Determine the rectangular bounding area.

[0085] In an exemplary embodiment, step 114 includes: if the voltage three-phase vector and coordinates corresponding to the current three-phase voltage signal exceed the circular boundary area or the rectangular boundary area, then determining that the error monitoring result is that there is an error in the capacitor voltage transformer; if the voltage three-phase vector and coordinates corresponding to the current three-phase voltage signal do not exceed the circular boundary area and the rectangular boundary area, then determining that the error monitoring result is that there is no error in the capacitor voltage transformer.

[0086] Among them, for the voltage three-phase vector and coordinates corresponding to the current three-phase voltage signal (assuming it is point A), the deviation judgment is performed in the following way:

[0087] According to the circular boundary area, assuming that the distance from point A to the cluster center is d, if , indicating that point A does not exceed the circular boundary area, and it is determined that there is no error in the capacitor voltage transformer; if , indicating that point A exceeds the circular boundary area, it is determined that there is an error in the capacitor voltage transformer;

[0088] According to the rectangular boundary area, assuming that the distance from point A to the long axis is d1 and the distance to the short axis is d2, if , indicating that point A does not exceed the rectangular boundary area, and it is determined that there is no error in the capacitor voltage transformer; if , indicating that point A exceeds the rectangular boundary area, and it is determined that there is an error in the capacitor voltage transformer.

[0089] In an optional implementation, the out-of-tolerance judgment can be made based on the circular boundary area alone, the out-of-tolerance judgment can be made based on the rectangular boundary area alone, or the out-of-tolerance judgment can be made based on the circular boundary area and the rectangular boundary area at the same time, that is, if point A exceeds the circular boundary area or the rectangular boundary area, it is determined that there is an error in the capacitive voltage transformer, otherwise it is considered that there is no error in the capacitive voltage transformer.

[0090] In an exemplary embodiment, step 114 includes: when the ratio between the semi-major axis of the major axis and the semi-minor axis of the minor axis is less than a preset threshold, performing an out-of-tolerance determination on the voltage three-phase vector and coordinates corresponding to the current three-phase voltage signal according to the circular boundary area to obtain an error monitoring result;

[0091] When the ratio between the semi-major axis of the major axis and the semi-minor axis of the minor axis is greater than or equal to the preset threshold, the voltage three-phase vector and coordinates corresponding to the current three-phase voltage signal are judged as out-of-tolerance according to the rectangular boundary area to obtain the error monitoring result.

[0092] The preset threshold refers to the critical value set in advance according to the actual situation and used to judge the size of the ratio. Assuming that the preset threshold is m, if , then the judgment is made based on the circular boundary area, that is: assuming that the distance from point A to the cluster center is d, if , indicating that point A does not exceed the circular boundary area, and it is determined that there is no error in the capacitor voltage transformer; if , indicating that point A exceeds the circular boundary area, and it is determined that there is an error in the capacitor voltage transformer.

[0093] like , then the judgment is made based on the rectangular boundary area, that is: assuming that the distance from point A to the long axis is d1 and the distance to the short axis is d2, if , indicating that point A does not exceed the rectangular boundary area, and it is determined that there is no error in the capacitor voltage transformer; if , indicating that point A exceeds the rectangular boundary area, and it is determined that there is an error in the capacitor voltage transformer.

[0094] For example, m=2, if , then make a judgment based on the circular boundary area; if , then the judgment is made based on the rectangular boundary area.

[0095] In this embodiment, two steady-state control domain boundary forms, circular and rectangular, are provided. The mechanism of the determination method is selected based on the ratio of the long and short axes, and can be flexibly adjusted according to the characteristics and needs of the actual power system, thereby enhancing the applicability of the method provided in this embodiment in different power system scenarios.

[0096] It should be understood that, although the various steps in the flowcharts involved in the various embodiments described above are displayed in sequence according to the instructions of the arrows, these steps are not necessarily executed in sequence in the order indicated by the arrows. Unless otherwise specified herein, there is no strict order restriction on the execution of these steps, and these steps can be executed in other orders. Moreover, at least a portion of the steps in the flowcharts involved in the various embodiments described above can include multiple steps or multiple stages, and these steps or stages are not necessarily executed and completed at the same time, but can be executed at different times, and the execution order of these steps or stages is not necessarily to be carried out in sequence, but can be executed in turn or alternately with other steps or at least a portion of steps or stages in other steps.

[0097] Based on the same inventive concept, embodiments of the present application also provide a capacitor voltage transformer error monitoring device for implementing the aforementioned capacitor voltage transformer error monitoring method. The solution provided by this device is similar to the solution described in the aforementioned method. Therefore, the specific limitations in the embodiments of one or more capacitor voltage transformer error monitoring devices provided below can be found in the limitations of the capacitor voltage transformer error monitoring method described above and will not be repeated here.

[0098] In an exemplary embodiment, Figure 3 As shown, a device for monitoring an error of a capacitor voltage transformer is provided, comprising:

[0099] The data acquisition module 302 is used to acquire a plurality of three-phase voltage signals within a preset time period, and calculate the voltage three-phase vectors and coordinates corresponding to the plurality of three-phase voltage signals.

[0100] The data processing module 304 is configured to determine a cluster center based on the voltage three-phase vectors and coordinates corresponding to the multiple three-phase voltage signals; sort the voltage three-phase vectors and coordinates corresponding to the multiple three-phase voltage signals based on the distance between each voltage three-phase vector and coordinate and the cluster center; and determine the coordinates of the boundary points based on the sorting result.

[0101] The boundary determination module 306 is used to determine the circular boundary area according to the cluster center and the boundary point coordinates; calculate the major axis and the minor axis according to the cluster center and the boundary point coordinates, and determine the rectangular boundary area based on the major axis and the minor axis.

[0102] The determination module 308 is configured to perform an out-of-tolerance determination on the voltage three-phase vector and coordinates corresponding to the current three-phase voltage signal based on the circular boundary area and the rectangular boundary area to obtain an error monitoring result.

[0103] The error monitoring device for capacitor voltage transformers (CVTs) described above precisely calculates the three-phase voltage vectors and coordinates and accurately divides the CVT's steady-state control domain, enabling a more accurate reflection of the stable range of the power system's three-phase voltage. Determining deviations based on accurately delineated circular and rectangular boundary areas reduces misjudgments and missed detections, facilitating timely detection of power system anomalies. This provides a reliable basis for fault diagnosis and maintenance, effectively ensuring the safe and stable operation of the power system.

[0104] In an exemplary embodiment, the three-phase voltage signal includes a first phase voltage, a second phase voltage, and a third phase voltage. The data processing module 304 is further configured to calculate the voltage three-phase vector and coordinates using the following formula:

[0105] ;

[0106] Among them, (x, y) represents the voltage three-phase vector and coordinates, represents the amplitude of the first phase voltage, represents the phase of the first phase voltage, represents the amplitude of the second phase voltage, represents the phase of the second phase voltage, represents the amplitude of the third phase voltage, Indicates the phase of the third-phase voltage.

[0107] In an exemplary embodiment, the data processing module 304 is further used to select, from the sorting results in ascending order of distance, several voltage three-phase vectors and coordinates with the highest sorting according to a set limit value; and determine the voltage three-phase vector and coordinate with the largest distance from the cluster center among the selected several voltage three-phase vectors and coordinates as the boundary point coordinates.

[0108] In an exemplary embodiment, the boundary determination module 306 is also used to calculate the first slope and the first intercept based on the cluster center and the boundary point coordinates, determine the major axis based on the first slope and the first intercept, and determine the distance between the boundary point coordinates and the cluster center as the semi-major axis; determine the second slope and the second intercept based on the cluster center and the first slope, and determine the minor axis based on the second slope and the second intercept; calculate the distance between each voltage three-phase vector and coordinate within a set range and the major axis; determine the calculated maximum distance as the semi-minor axis; and determine the rectangular boundary area based on the major axis, the semi-major axis, the minor axis, and the semi-minor axis.

[0109] In an exemplary embodiment, the judgment module 308 is also used to determine that the error monitoring result is that there is an error in the capacitor voltage transformer if the voltage three-phase vector and coordinates corresponding to the current three-phase voltage signal exceed the circular boundary area or the rectangular boundary area; if the voltage three-phase vector and coordinates corresponding to the current three-phase voltage signal do not exceed the circular boundary area and the rectangular boundary area, then the error monitoring result is determined that there is no error in the capacitor voltage transformer.

[0110] In an exemplary embodiment, the judgment module 308 is also used to perform an out-of-tolerance judgment on the voltage three-phase vector and coordinates corresponding to the current three-phase voltage signal according to the circular boundary area when the ratio between the semi-major axis of the major axis and the semi-minor axis of the minor axis is less than a preset threshold, and obtain an error monitoring result; when the ratio between the semi-major axis of the major axis and the semi-minor axis of the minor axis is greater than or equal to the preset threshold, perform an out-of-tolerance judgment on the voltage three-phase vector and coordinates corresponding to the current three-phase voltage signal according to the rectangular boundary area, and obtain an error monitoring result.

[0111] Each module in the aforementioned capacitor voltage transformer error monitoring device can be implemented in whole or in part through software, hardware, or a combination thereof. Each module can be embedded in or independent of a processor in an electronic device in hardware form, or can be stored in a memory in the electronic device in software form, so that the processor can call and execute the corresponding operations of each module.

[0112] In an exemplary embodiment, an electronic device is provided. The electronic device may be a server, and its internal structure diagram may be as shown in FIG. Figure 4 As shown. The electronic device includes a processor, a memory, an input / output interface (Input / Output, abbreviated as I / O) and a communication interface. The processor, the memory and the input / output interface are connected through a system bus, and the communication interface is connected to the system bus through the input / output interface. The processor of the electronic device is used to provide computing and control capabilities. The memory of the electronic device includes a non-volatile storage medium and an internal memory. The non-volatile storage medium stores an operating system and a computer program. The internal memory provides an environment for the operation of the operating system and the computer program in the non-volatile storage medium. The input / output interface of the electronic device is used to exchange information between the processor and an external device. The communication interface of the electronic device is used to communicate with an external terminal through a network connection. When the computer program is executed by the processor, a method for monitoring an error of a capacitive voltage transformer is implemented.

[0113] Those skilled in the art will understand that Figure 4 The structure shown in the figure is only a block diagram of a part of the structure related to the solution of the present application, and does not constitute a limitation on the electronic device to which the solution of the present application is applied. The specific electronic device may include more or fewer components than shown in the figure, or combine certain components, or have a different component arrangement.

[0114] In an exemplary embodiment, an electronic device is provided, including a memory and a processor, wherein a computer program is stored in the memory, and the processor implements the following steps when executing the computer program: collecting multiple three-phase voltage signals within a preset time period, calculating the voltage three-phase vectors and coordinates corresponding to the multiple three-phase voltage signals respectively; determining a cluster center according to the voltage three-phase vectors and coordinates corresponding to the multiple three-phase voltage signals respectively; sorting the voltage three-phase vectors and coordinates corresponding to the multiple three-phase voltage signals according to the distance between each voltage three-phase vector and coordinate and the cluster center; determining the boundary point coordinates according to the sorting result; determining a circular boundary area according to the cluster center and the boundary point coordinates; calculating the major axis and the minor axis according to the cluster center and the boundary point coordinates, and determining a rectangular boundary area based on the major axis and the minor axis; and performing an out-of-tolerance judgment on the voltage three-phase vector and coordinate corresponding to the current three-phase voltage signal based on the circular boundary area and the rectangular boundary area to obtain an error monitoring result.

[0115] In one embodiment, when the processor executes the computer program, the following steps are further implemented: the three-phase voltage signal includes a first phase voltage, a second phase voltage, and a third phase voltage, and the voltage three-phase vector and coordinates are calculated using the following formula:

[0116] ;

[0117] Among them, (x, y) represents the voltage three-phase vector and coordinates, represents the amplitude of the first phase voltage, represents the phase of the first phase voltage, represents the amplitude of the second phase voltage, represents the phase of the second phase voltage, represents the amplitude of the third phase voltage, Indicates the phase of the third-phase voltage.

[0118] In one embodiment, when the processor executes the computer program, the following steps are further implemented: according to a set limit value, from the results of sorting from small to large distances, a number of voltage three-phase vectors and coordinates with the highest sorting order are selected; and among the selected number of voltage three-phase vectors and coordinates, the voltage three-phase vector and coordinate with the largest distance from the cluster center is determined as the boundary point coordinates.

[0119] In one embodiment, when the processor executes the computer program, the following steps are also implemented: according to the cluster center and the boundary point coordinates, the first slope and the first intercept are calculated, the major axis is determined according to the first slope and the first intercept, and the distance between the boundary point coordinates and the cluster center is determined as the semi-major axis; according to the cluster center and the first slope, the second slope and the second intercept are determined, and the minor axis is determined according to the second slope and the second intercept; the distance between each voltage three-phase vector and coordinate within the set range and the major axis is calculated; the calculated maximum distance is determined as the semi-minor axis; and the rectangular boundary area is determined according to the major axis, the semi-major axis, the minor axis and the semi-minor axis.

[0120] In one embodiment, when the processor executes the computer program, the following steps are also implemented: if the voltage three-phase vector and coordinates corresponding to the current three-phase voltage signal exceed the circular boundary area or the rectangular boundary area, the error monitoring result is determined to be that there is an error in the capacitor voltage transformer; if the voltage three-phase vector and coordinates corresponding to the current three-phase voltage signal do not exceed the circular boundary area and the rectangular boundary area, the error monitoring result is determined to be that there is no error in the capacitor voltage transformer.

[0121] In one embodiment, when the processor executes the computer program, the following steps are also implemented: when the ratio between the semi-major axis of the major axis and the semi-minor axis of the minor axis is less than a preset threshold, the voltage three-phase vector and coordinates corresponding to the current three-phase voltage signal are judged to be out of tolerance based on the circular boundary area to obtain an error monitoring result; when the ratio between the semi-major axis of the major axis and the semi-minor axis of the minor axis is greater than or equal to the preset threshold, the voltage three-phase vector and coordinates corresponding to the current three-phase voltage signal are judged to be out of tolerance based on the rectangular boundary area to obtain an error monitoring result.

[0122] In one embodiment, a computer-readable storage medium is provided, on which a computer program is stored. When the computer program is executed by a processor, the following steps are implemented: collecting multiple three-phase voltage signals within a preset time period, calculating the voltage three-phase vectors and coordinates corresponding to the multiple three-phase voltage signals respectively; determining a cluster center based on the voltage three-phase vectors and coordinates corresponding to the multiple three-phase voltage signals respectively; sorting the voltage three-phase vectors and coordinates corresponding to the multiple three-phase voltage signals according to the distance between each voltage three-phase vector and coordinate and the cluster center; determining the boundary point coordinates according to the sorting result; determining a circular boundary area according to the cluster center and the boundary point coordinates; calculating the major axis and the minor axis according to the cluster center and the boundary point coordinates, and determining a rectangular boundary area based on the major axis and the minor axis; and performing an out-of-tolerance judgment on the voltage three-phase vector and coordinates corresponding to the current three-phase voltage signal based on the circular boundary area and the rectangular boundary area to obtain an error monitoring result.

[0123] In one embodiment, when the computer program is executed by the processor, the following steps are further implemented: the three-phase voltage signal includes a first phase voltage, a second phase voltage, and a third phase voltage, and the voltage three-phase vector and coordinates are calculated using the following formula:

[0124] ;

[0125] Among them, (x, y) represents the voltage three-phase vector and coordinates, represents the amplitude of the first phase voltage, represents the phase of the first phase voltage, represents the amplitude of the second phase voltage, represents the phase of the second phase voltage, represents the amplitude of the third phase voltage, Indicates the phase of the third-phase voltage.

[0126] In one embodiment, when the computer program is executed by the processor, the following steps are further implemented: according to a set limit value, from the results of sorting from small to large distances, several voltage three-phase vectors and coordinates with the highest sorting order are selected; and among the several selected voltage three-phase vectors and coordinates, the voltage three-phase vector and coordinate with the largest distance from the cluster center is determined as the boundary point coordinates.

[0127] In one embodiment, when the computer program is executed by the processor, the following steps are also implemented: according to the cluster center and the boundary point coordinates, the first slope and the first intercept are calculated, the major axis is determined according to the first slope and the first intercept, and the distance between the boundary point coordinates and the cluster center is determined as the semi-major axis; according to the cluster center and the first slope, the second slope and the second intercept are determined, and the minor axis is determined according to the second slope and the second intercept; the distance between each voltage three-phase vector and coordinate within the set range and the major axis is calculated; the calculated maximum distance is determined as the semi-minor axis; and the rectangular boundary area is determined according to the major axis, the semi-major axis, the minor axis and the semi-minor axis.

[0128] In one embodiment, when the computer program is executed by the processor, the following steps are also implemented: if the voltage three-phase vector and coordinates corresponding to the current three-phase voltage signal exceed the circular boundary area or the rectangular boundary area, the error monitoring result is determined to be that there is an error in the capacitor voltage transformer; if the voltage three-phase vector and coordinates corresponding to the current three-phase voltage signal do not exceed the circular boundary area and the rectangular boundary area, the error monitoring result is determined to be that there is no error in the capacitor voltage transformer.

[0129] In one embodiment, when the computer program is executed by the processor, the following steps are also implemented: when the ratio between the semi-major axis of the major axis and the semi-minor axis of the minor axis is less than a preset threshold, the voltage three-phase vector and coordinates corresponding to the current three-phase voltage signal are judged to be out of tolerance based on the circular boundary area to obtain an error monitoring result; when the ratio between the semi-major axis of the major axis and the semi-minor axis of the minor axis is greater than or equal to the preset threshold, the voltage three-phase vector and coordinates corresponding to the current three-phase voltage signal are judged to be out of tolerance based on the rectangular boundary area to obtain an error monitoring result.

[0130] In one embodiment, a computer program product is provided, comprising a computer program, which, when executed by a processor, implements the following steps: collecting multiple three-phase voltage signals within a preset time period, calculating voltage three-phase vectors and coordinates corresponding to the multiple three-phase voltage signals; determining a cluster center based on the voltage three-phase vectors and coordinates corresponding to the multiple three-phase voltage signals; sorting the voltage three-phase vectors and coordinates corresponding to the multiple three-phase voltage signals based on the distance between each voltage three-phase vector and coordinate and the cluster center; determining boundary point coordinates based on the sorting result; determining a circular boundary area based on the cluster center and the boundary point coordinates; calculating a major axis and a minor axis based on the cluster center and the boundary point coordinates, and determining a rectangular boundary area based on the major axis and the minor axis; and performing an out-of-tolerance judgment on the voltage three-phase vector and coordinates corresponding to the current three-phase voltage signal based on the circular boundary area and the rectangular boundary area to obtain an error monitoring result.

[0131] In one embodiment, when the computer program is executed by the processor, the following steps are further implemented: the three-phase voltage signal includes a first phase voltage, a second phase voltage, and a third phase voltage, and the voltage three-phase vector and coordinates are calculated using the following formula:

[0132] ;

[0133] Among them, (x, y) represents the voltage three-phase vector and coordinates, represents the amplitude of the first phase voltage, represents the phase of the first phase voltage, represents the amplitude of the second phase voltage, represents the phase of the second phase voltage, represents the amplitude of the third phase voltage, Indicates the phase of the third-phase voltage.

[0134] In one embodiment, when the computer program is executed by the processor, the following steps are further implemented: according to a set limit value, from the results of sorting from small to large distances, several voltage three-phase vectors and coordinates with the highest sorting order are selected; and among the several selected voltage three-phase vectors and coordinates, the voltage three-phase vector and coordinate with the largest distance from the cluster center is determined as the boundary point coordinates.

[0135] In one embodiment, when the computer program is executed by the processor, the following steps are also implemented: according to the cluster center and the boundary point coordinates, the first slope and the first intercept are calculated, the major axis is determined according to the first slope and the first intercept, and the distance between the boundary point coordinates and the cluster center is determined as the semi-major axis; according to the cluster center and the first slope, the second slope and the second intercept are determined, and the minor axis is determined according to the second slope and the second intercept; the distance between each voltage three-phase vector and coordinate within the set range and the major axis is calculated; the calculated maximum distance is determined as the semi-minor axis; and the rectangular boundary area is determined according to the major axis, the semi-major axis, the minor axis and the semi-minor axis.

[0136] In one embodiment, when the computer program is executed by the processor, the following steps are also implemented: if the voltage three-phase vector and coordinates corresponding to the current three-phase voltage signal exceed the circular boundary area or the rectangular boundary area, the error monitoring result is determined to be that there is an error in the capacitor voltage transformer; if the voltage three-phase vector and coordinates corresponding to the current three-phase voltage signal do not exceed the circular boundary area and the rectangular boundary area, the error monitoring result is determined to be that there is no error in the capacitor voltage transformer.

[0137] In one embodiment, when the computer program is executed by the processor, the following steps are also implemented: when the ratio between the semi-major axis of the major axis and the semi-minor axis of the minor axis is less than a preset threshold, the voltage three-phase vector and coordinates corresponding to the current three-phase voltage signal are judged to be out of tolerance based on the circular boundary area to obtain an error monitoring result; when the ratio between the semi-major axis of the major axis and the semi-minor axis of the minor axis is greater than or equal to the preset threshold, the voltage three-phase vector and coordinates corresponding to the current three-phase voltage signal are judged to be out of tolerance based on the rectangular boundary area to obtain an error monitoring result.

[0138] Those skilled in the art will understand that all or part of the processes in the above-mentioned embodiments can be implemented by instructing the relevant hardware through a computer program. The computer program can be stored in a non-volatile computer-readable storage medium. When the computer program is executed, it can include the processes of the embodiments of the above-mentioned methods. Among them, the memory, database or other media mentioned in each embodiment provided by this application can include at least one of non-volatile memory 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 various forms, such as static random access memory (SRAM) or dynamic random access memory (DRAM). The databases involved in the various embodiments provided herein may include at least one of a relational database and a non-relational database. Non-relational databases may include, but are not limited to, blockchain-based distributed databases. The processors involved in the various embodiments provided herein may be, but are not limited to, general-purpose processors, central processing units (CPUs), graphics processing units (GPUs), digital signal processors (DSPs), programmable logic devices (PLDs), quantum computing-based data processing logic devices, artificial intelligence (AI) processors, and the like.

[0139] The technical features of the above embodiments can be combined arbitrarily. In order to make the description concise, 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 application.

[0140] The above-described embodiments merely represent several implementation methods of the present application. While the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the present application. It should be noted that a person of ordinary skill in the art may make various modifications and improvements without departing from the spirit of the present application, and these modifications and improvements fall within the scope of protection of the present application. Therefore, the scope of protection of the present application shall be determined by the appended claims.

Claims

1. A method for monitoring an error of a capacitor voltage transformer, characterized in that: The method comprises: Collecting multiple three-phase voltage signals within a preset time period, and calculating voltage three-phase vectors and coordinates corresponding to the multiple three-phase voltage signals respectively; Determining a cluster center according to the voltage three-phase vectors and coordinates respectively corresponding to the multiple three-phase voltage signals; sorting the voltage three-phase vectors and coordinates respectively corresponding to the plurality of three-phase voltage signals according to the distance between each voltage three-phase vector and coordinate and the cluster center; Determine the coordinates of the boundary points according to the sorting results; Determining a circular boundary area according to the cluster center and the boundary point coordinates; Calculating a major axis and a minor axis according to the cluster center and the coordinates of the boundary point, and determining a rectangular boundary area based on the major axis and the minor axis; Based on the circular boundary area and the rectangular boundary area, an out-of-tolerance judgment is performed on the voltage three-phase vector and coordinates corresponding to the current three-phase voltage signal to obtain an error monitoring result.

2. The method according to claim 1, characterized in that The three-phase voltage signal includes the first phase voltage, the second phase voltage and the third phase voltage. The voltage three-phase vector and coordinates are calculated using the following formula: ； Among them, (x, y) represents the voltage three-phase vector and coordinates, represents the amplitude of the first phase voltage, represents the phase of the first phase voltage, represents the amplitude of the second phase voltage, represents the phase of the second phase voltage, represents the amplitude of the third phase voltage, represents the phase of the third phase voltage.

3. The method according to claim 1, characterized in that Determining the coordinates of the boundary points according to the sorting results includes: According to the set limit, select several voltage three-phase vectors and coordinates with the highest order from the results sorted from smallest to largest distance; The voltage three-phase vector and coordinates having the largest distance from the cluster center among the selected voltage three-phase vectors and coordinates are determined as the boundary point coordinates.

4. The method according to claim 1, wherein The calculating of the major axis and the minor axis according to the cluster center and the coordinates of the boundary point, and determining the rectangular boundary area based on the major axis and the minor axis, includes: Calculating a first slope and a first intercept according to the cluster center and the boundary point coordinates, determining a major axis according to the first slope and the first intercept, and determining the distance between the boundary point coordinates and the cluster center as the semi-major axis; determining a second slope and a second intercept according to the cluster center and the first slope, and determining a short axis according to the second slope and the second intercept; Calculate the distance between each voltage three-phase vector sum coordinate and the long axis within a set range; The calculated maximum distance is determined as the semi-minor axis; A rectangular boundary area is determined according to the major axis, the semi-major axis, the minor axis, and the semi-minor axis.

5. The method according to any one of claims 1 to 4, characterized in that The method of performing an out-of-tolerance determination on the voltage three-phase vector and coordinates corresponding to the current three-phase voltage signal based on the circular boundary area and the rectangular boundary area to obtain an error monitoring result includes: If the voltage three-phase vector and coordinates corresponding to the current three-phase voltage signal exceed the circular boundary area or the rectangular boundary area, it is determined that the error monitoring result is that there is an error in the capacitor voltage transformer; If the voltage three-phase vector and coordinates corresponding to the current three-phase voltage signal do not exceed the circular boundary area and the rectangular boundary area, it is determined that the error monitoring result is that there is no error in the capacitor voltage transformer.

6. The method according to any one of claims 1 to 4, characterized in that The method of performing an out-of-tolerance determination on the voltage three-phase vector and coordinates corresponding to the current three-phase voltage signal based on the circular boundary area and the rectangular boundary area to obtain an error monitoring result includes: When the ratio between the semi-major axis of the major axis and the semi-minor axis of the minor axis is less than a preset threshold, performing an out-of-tolerance judgment on the voltage three-phase vector and coordinates corresponding to the current three-phase voltage signal according to the circular boundary area to obtain an error monitoring result; When the ratio between the semi-major axis of the major axis and the semi-minor axis of the minor axis is greater than or equal to a preset threshold, the voltage three-phase vector and coordinates corresponding to the current three-phase voltage signal are judged as out-of-tolerance based on the rectangular boundary area to obtain an error monitoring result.

7. A capacitor voltage transformer error monitoring device, characterized in that: The device comprises: A data acquisition module is used to collect multiple three-phase voltage signals within a preset time period and calculate the voltage three-phase vectors and coordinates corresponding to the multiple three-phase voltage signals; a data processing module, configured to determine a cluster center based on the voltage three-phase vectors and coordinates respectively corresponding to the multiple three-phase voltage signals; sort the voltage three-phase vectors and coordinates respectively corresponding to the multiple three-phase voltage signals based on the distance between each voltage three-phase vector and coordinate and the cluster center; and determine the coordinates of the boundary points based on the sorting result; a boundary determination module, configured to determine a circular boundary region based on the cluster centers and the coordinates of the boundary points; calculate a major axis and a minor axis based on the cluster centers and the coordinates of the boundary points, and determine a rectangular boundary region based on the major axis and the minor axis; The determination module is used to perform out-of-tolerance determination on the voltage three-phase vector and coordinates corresponding to the current three-phase voltage signal based on the circular boundary area and the rectangular boundary area to obtain an error monitoring result.

8. An electronic device comprising a memory and a processor, wherein the memory stores a computer program, wherein: When the processor executes the computer program, the steps of the method according to any one of claims 1 to 6 are implemented.

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

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

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