Error monitoring method, device and equipment of capacitive voltage transformer, storage medium and program product

Abstract

The application relates to an error monitoring method, device and equipment of a capacitive voltage transformer, a storage medium and a program product. In the application, a plurality of three-phase voltage signals in a preset time period are collected, corresponding voltage three-phase vector sums and coordinates are calculated, a clustering center is determined according to the voltage three-phase vector sums and the coordinates, the voltage three-phase vector sums and the coordinates are sorted according to the distance between each voltage three-phase vector sum and the clustering center, a boundary point coordinate is determined according to the sorting result, a circular boundary region is determined according to the clustering center and the boundary point coordinate, a long axis and a short axis are calculated according to the clustering center and the boundary point coordinate, and a rectangular boundary region is determined based on the long axis and the short axis. The current voltage three-phase vector sum and coordinate are subjected to an over-limit determination based on the circular boundary region and the rectangular boundary region, and an error monitoring result is obtained. The method can accurately determine the stability of three-phase voltage in a power system and guarantee the safe and stable operation of the power system.

Description

TECHNICAL FIELD

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

[0002] In the field of power systems, capacitor voltage transformers (CVT) play a crucial role, and their performance directly affects the accuracy of voltage measurement and the stability of the entire system. Currently, CVT error monitoring systems rely on periodic offline calculations, which are difficult to capture transient abnormalities in a timely manner. This lag may lead to failure to discover abnormal conditions caused by potential faults in a timely manner. In addition, environmental factors such as temperature, humidity, and mechanical vibration can significantly affect the performance of CVT measurement. Traditional devices use fixed compensation coefficients and cannot adapt to dynamic environmental changes. In particular, in new energy stations, power fluctuations exacerbate the coupling effect of CVT error and environmental factors, further increasing the monitoring error of CVT. SUMMARY

[0003] Therefore, it is necessary to provide a capacitor voltage transformer error monitoring method, device, electronic equipment, computer readable storage medium and computer program product to accurately determine the stability of three-phase voltage in a power system and ensure the safe and stable operation of the power system.

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

[0005] Collecting a plurality of three-phase voltage signals within a preset time period, and calculating voltage three-phase vector and coordinates corresponding to the plurality of three-phase voltage signals, respectively;

[0006] Determining a cluster center according to the voltage three-phase vector and coordinates corresponding to the plurality of three-phase voltage signals, respectively;

[0007] Sorting the voltage three-phase vector and coordinates corresponding to the plurality of three-phase voltage signals according to the distance between each voltage three-phase vector and coordinates and the cluster center;

[0008] Determining a boundary point coordinate according to the sorting result;

[0009] Determining a circular boundary region according to the cluster center and the boundary point coordinate;

[0010] Calculating a long axis and a short axis according to the cluster center and the boundary point coordinate, and determining a rectangular boundary region based on the long axis and the short axis;

[0011] Based on the circular boundary region and the rectangular boundary region, performing an out-of-tolerance determination on the voltage three-phase vector and coordinates corresponding to the current three-phase voltage signal to obtain an error monitoring result.

[0012] In one of the embodiments, 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 sum coordinate is calculated by the following formula:

[0013] ;

[0014] wherein (x, y) represents the voltage three-phase vector sum coordinate, 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.

[0015] In one of the embodiments, the boundary point coordinate is determined according to the sorting result, including:

[0016] According to the set limit value, a plurality of voltage three-phase vector sum coordinates with high ranking are selected from the sorting results from small to large distance;

[0017] The voltage three-phase vector sum coordinate with the largest distance between the selected voltage three-phase vector sum coordinates and the clustering center is determined as the boundary point coordinate.

[0018] In one of the embodiments, the long axis and the short axis are calculated according to the clustering center and the boundary point coordinate, and the rectangular boundary region is determined based on the long axis and the short axis, including:

[0019] The first slope and the first intercept are calculated according to the clustering center and the boundary point coordinate, the long axis is determined according to the first slope and the first intercept, and the distance between the boundary point coordinate and the clustering center is determined as the semi-major axis;

[0020] The second slope and the second intercept are determined according to the clustering center and the first slope, and the short axis is determined according to the second slope and the second intercept;

[0021] The distance between each voltage three-phase vector sum coordinate in the set range and the long axis is calculated;

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

[0023] The rectangular boundary region is determined according to the long axis, the semi-major axis, the short axis and the semi-minor axis.

[0024] In one of the embodiments, the error monitoring result is obtained by performing the out-of-tolerance judgment on the voltage three-phase vector sum coordinate corresponding to the current three-phase voltage signal based on the circular boundary region and the rectangular boundary region, including:

[0025] If the voltage three-phase vector and the coordinate corresponding to the current three-phase voltage signal exceed the circular boundary region or the rectangular boundary region, it is determined that the error monitoring result is that the capacitive voltage transformer has an error;

[0026] If the voltage three-phase vector and the coordinate corresponding to the current three-phase voltage signal do not exceed the circular boundary region and the rectangular boundary region, it is determined that the error monitoring result is that the capacitive voltage transformer has no error.

[0027] In one embodiment, based on the circular boundary region and the rectangular boundary region, the voltage three-phase vector and the coordinate corresponding to the current three-phase voltage signal are determined to be out of tolerance, and an error monitoring result is obtained, including:

[0028] In the case where the ratio between the half long axis of the long axis line and the half short axis of the short axis line is less than a preset threshold, the voltage three-phase vector and the coordinate corresponding to the current three-phase voltage signal are determined to be out of tolerance according to the circular boundary region, and an error monitoring result is obtained;

[0029] In the case where the ratio between the half long axis of the long axis line and the half short axis of the short axis line is greater than or equal to the preset threshold, the voltage three-phase vector and the coordinate corresponding to the current three-phase voltage signal are determined to be out of tolerance according to the rectangular boundary region, and an error monitoring result is obtained.

[0030] In a second aspect, the application also provides an error monitoring device for a capacitive voltage transformer, including:

[0031] The data acquisition module is configured to acquire a plurality of three-phase voltage signals in a preset time period, and calculate voltage three-phase vector and coordinate corresponding to the plurality of three-phase voltage signals respectively;

[0032] The data processing module is configured to determine a cluster center according to the voltage three-phase vector and the coordinate corresponding to the plurality of three-phase voltage signals respectively, sort the voltage three-phase vector and the coordinate corresponding to the plurality of three-phase voltage signals respectively according to the distance between each voltage three-phase vector and coordinate and the cluster center, and determine a boundary point coordinate according to the sorting result;

[0033] The boundary determination module is configured to determine a circular boundary region according to the cluster center and the boundary point coordinate, calculate a long axis line and a short axis line according to the cluster center and the boundary point coordinate, and determine a rectangular boundary region based on the long axis line and the short axis line;

[0034] The determination module is configured to determine the voltage three-phase vector and the coordinate corresponding to the current three-phase voltage signal to be out of tolerance based on the circular boundary region and the rectangular boundary region, and obtain an error monitoring result.

[0035] In a third aspect, the present application also provides an electronic device comprising a memory and a processor, wherein the memory stores a computer program, and the processor executes the computer program to implement the steps of the method according to the first aspect.

[0036] In a fourth aspect, the present application also provides a computer-readable storage medium, which stores a computer program, and the computer program is executed by a processor to implement the steps of the method according to the first aspect.

[0037] In a fifth aspect, the present application also provides a computer program product comprising a computer program, and the computer program is executed by a processor to implement the steps of the method according to the first aspect.

[0038] The error monitoring method, device, electronic device, computer-readable storage medium and computer program product of the capacitive voltage transformer, the plurality of three-phase voltage signals in the preset time period are collected, the voltage three-phase vector and the coordinate corresponding to the plurality of three-phase voltage signals are calculated; the cluster center is determined according to the voltage three-phase vector and the coordinate corresponding to the plurality of three-phase voltage signals; the voltage three-phase vector and the coordinate corresponding to the plurality of three-phase voltage signals are sorted according to the distance between each voltage three-phase vector and the coordinate and the cluster center; the boundary point coordinate is determined according to the sorting result; the circular boundary region is determined according to the cluster center and the boundary point coordinate; the long axis and the short axis are calculated according to the cluster center and the boundary point coordinate, and the rectangular boundary region is determined based on the long axis and the short axis; the voltage three-phase vector and the coordinate corresponding to the current three-phase voltage signal are judged for over-limit according to the circular boundary region and the rectangular boundary region, and the error monitoring result is obtained. In the above manner, the voltage three-phase vector and the coordinate are accurately calculated, the stable control domain of the CVT is accurately divided, and the stable range of the three-phase voltage of the power system can be more accurately reflected. Based on the accurate division of the circular boundary region and the rectangular boundary region, the over-limit judgment can reduce the misjudgment and omission, help to discover the abnormality in the power system in time, provide a reliable basis for fault diagnosis and maintenance of the power system, and effectively guarantee the safe and stable operation of the power system. The method has important significance for the stable operation and fault prevention of the power system, has the advantages of simple operation, strong adaptability and high precision, and is suitable for monitoring requirements of various power systems. BRIEF DESCRIPTION OF DRAWINGS

[0039] 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.

[0040] Figure 1 a flowchart of an error monitoring method of a capacitive voltage transformer in an embodiment;

[0041] Figure 2 a schematic diagram of a boundary region in an embodiment;

[0042] Figure 3 a block diagram of an error monitoring device of a capacitive voltage transformer in an embodiment;

[0043] Figure 4 an internal structure diagram of an electronic device in an embodiment. DETAILED DESCRIPTION

[0044] In order to make the purpose, technical scheme and advantages of the present application clearer, the present application will be further described in detail below 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 do not limit the present application.

[0045] In an exemplary embodiment, as shown in the figure, an error monitoring method of a capacitive voltage transformer is provided, and the present embodiment is exemplified by the method applied to an electronic device, which comprises the following steps:

[0046] Step 102, a plurality of three-phase voltage signals in a preset time period are collected, and voltage three-phase vector sums and coordinates corresponding to the plurality of three-phase voltage signals are calculated.

[0047] Among them, the electronic device is in communication connection with a capacitive voltage transformer (CVT) secondary side voltage sensor, and the three-phase voltage signals are synchronously collected through the voltage sensor. Optionally, the electronic device applying the error monitoring method of the capacitive voltage transformer provided by the present embodiment collects the three-phase voltage signals every certain period of time, and updates the range of the steady-state control domain (i.e. the circular boundary region and the rectangular boundary region) based on a plurality of three-phase voltage signals in a certain period of time.

[0048] The preset time period refers to a pre-agreed time range, which can be adjusted according to actual needs, such as within one day, within one week, within one month, etc., and the present embodiment does not limit the specific value. Exemplarily, a plurality of three-phase voltage signals within one day are collected through the voltage sensor, and a plurality of voltage three-phase vector sums and coordinates are calculated to form a voltage three-phase vector sum dataset. Referring to Figure 2 Each voltage three-phase vector sum and coordinate can be understood as a point in the coordinate system.

[0049] Step 104, a cluster center is determined according to the voltage three-phase vector sums and coordinates corresponding to the plurality of three-phase voltage signals.

[0050] In a specific implementation, based on the plurality of voltage three-phase vector sums, a meanshift method or a 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] wherein n represents the total number of voltage three-phase vector sums, represents the x coordinate in the i-th voltage three-phase vector sum, represents the y coordinate in the i-th voltage three-phase vector sum.

[0053] It can be understood that other clustering algorithms can also be used, and the present embodiment does not limit this.

[0054] Step 106: Sort the voltage three-phase vector sums corresponding to the plurality of three-phase voltage signals according to the distance between each voltage three-phase vector sum and the cluster center.

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

[0056] ;

[0057] wherein represents the cluster center, represents the i-th voltage three-phase vector sum.

[0058] It can be understood that for the plurality of voltage three-phase vector sums, they can be sorted according to the distance from the cluster center in ascending order, or sorted according to the distance from the cluster center in descending order.

[0059] Step 108: Determine the boundary point coordinates according to the sorting result.

[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 an optional implementation, the plurality of voltage three-phase vector sum coordinates are sorted according to distances from the cluster center in descending order; according to a set limit, a plurality of voltage three-phase vector sum coordinates at the back of the sorting result in descending order are selected; and the voltage three-phase vector sum coordinate with the smallest distance from the cluster center among the selected plurality of voltage three-phase vector sum coordinates is determined as the boundary point coordinate. The set limit refers to a distance threshold or a proportion parameter set in advance, for example, 1% of the voltage three-phase vector sum coordinates are selected in descending order.

[0062] In an optional implementation, the plurality of voltage three-phase vector sum coordinates are sorted according to distances from the cluster center in descending order; according to a set limit, a plurality of voltage three-phase vector sum coordinates at the back of the sorting result in descending order are selected; and the voltage three-phase vector sum coordinate with the smallest distance from the cluster center among the selected plurality of voltage three-phase vector sum coordinates is determined as the boundary point coordinate. The set limit refers to a distance threshold or a proportion parameter set in advance, for example, 1% of the voltage three-phase vector sum coordinates are selected in descending order.

[0063] Step 110, determining a circular boundary region according to the cluster center and the boundary point coordinate.

[0064] wherein, referring to Figure 2 , the cluster center is taken as the center, the boundary point coordinate is taken as the radius, and the circular boundary region is determined. L

[0065] Step 112, calculating a long axis and a short axis according to the cluster center and the boundary point coordinate, and determining a rectangular boundary region based on the long axis and the short axis.

[0066] wherein, the circular boundary region and the rectangular boundary region refer to a steady-state control domain, used to represent a stable range of three-phase voltage of the power system.

[0067] Step 114, performing an out-of-tolerance judgment on a voltage three-phase vector sum coordinate corresponding to a current three-phase voltage signal based on the circular boundary region and the rectangular boundary region, to obtain an error monitoring result.

[0068] wherein, the current three-phase voltage signal refers to data collected in real time by a voltage sensor, and the out-of-tolerance judgment is performed on a new voltage three-phase vector sum coordinate according to the steady-state control domain to obtain the error monitoring result.

[0069] ​​The error monitoring method of the capacitive voltage transformer comprises the following steps: collecting a plurality of three-phase voltage signals in a preset time period, calculating voltage three-phase vector sums and coordinates corresponding to the plurality of three-phase voltage signals respectively; determining a cluster center according to the voltage three-phase vector sums and coordinates corresponding to the plurality of three-phase voltage signals respectively; sorting the voltage three-phase vector sums and coordinates corresponding to the plurality of three-phase voltage signals according to distances between each voltage three-phase vector sum and coordinate and the cluster center; determining a boundary point coordinate according to a sorting result; determining a circular boundary region according to the cluster center and the boundary point coordinate; calculating a long axis and a short axis based on the cluster center and the boundary point coordinate, and determining a rectangular boundary region based on the long axis and the short axis; and performing an out-of-tolerance judgment on a voltage three-phase vector sum and coordinate corresponding to a current three-phase voltage signal based on the circular boundary region and the rectangular boundary region to obtain an error monitoring result. In this way, the voltage three-phase vector sum and coordinate are accurately calculated, the steady-state control domain of the CVT is accurately divided, and the stable range of the three-phase voltage of the power system can be more accurately reflected. The out-of-tolerance judgment based on the circular boundary region and the rectangular boundary region accurately divided can reduce the misjudgment and omission, help to discover the abnormality in the power system in time, 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 comprises a first-phase voltage, a second-phase voltage and a third-phase voltage, and the voltage three-phase vector sum and coordinate are calculated by the following formula:

[0071] ;

[0072] wherein (x, y) represents the voltage three-phase vector sum and coordinate, represents an amplitude of the first-phase voltage, represents a phase of the first-phase voltage, represents an amplitude of the second-phase voltage, represents a phase of the second-phase voltage, represents an amplitude of the third-phase voltage, represents a phase of the third-phase voltage.

[0073] In an exemplary embodiment, step 108 comprises: selecting a plurality of voltage three-phase vector sums and coordinates with a small distance from the distance sorting result according to a set limit value; and determining, as the boundary point coordinate, the voltage three-phase vector sum and coordinate with the largest distance from the cluster center among the selected plurality of voltage three-phase vector sums and coordinates.

[0074] wherein the set limit value refers to a distance threshold value or a proportion parameter set in advance, and it is assumed that the set limit value is 99%, and the distance is sorted from small to large, and 99% of the points are selected for range division to locate the boundary point coordinate In this way, the interference of outliers or noise points can be eliminated, thereby improving the accuracy of the defined steady-state control domain.

[0075] In an exemplary embodiment, step 112 includes: calculating a first slope and a first intercept based on the coordinates of the cluster center and boundary points; determining a 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 a minor axis based on the second slope and the second intercept; calculating the distance between the three-phase vector and coordinates of each voltage within a set range and the major axis; determining the maximum calculated distance as the semi-minor axis; and determining a rectangular boundary region 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 is obtained through the formula To express, The first slope, The first intercept is used. Based on the cluster centers... and boundary point coordinates Calculated using the following formula and :

[0077] ;

[0078] boundary point coordinates With cluster center The distance R between them L It has been determined to be a semi-major axis.

[0079] The minor axis is obtained through the formula Representation is performed based on cluster centers. and the first slope The second slope is calculated using the following formula. Second intercept :

[0080] ;

[0081] The defined range refers to a circular area centered at the cluster center with radius R, where R can be set to Rc. L It can also be other values. The major axis is represented as... The coordinates of the point are The distance from all points within the specified range to the long axis is calculated using the following formula:

[0082] ;

[0083] Determine the point with the largest guide axis distance among all points within the set range. and the distance R from this point to the long axis S is determined as the half short axis.

[0084] Referring to Figure 2 , according to the long axis , the half long axis R L , the short axis , the half short axis R S determined rectangular boundary region.

[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 region or the rectangular boundary region, determining that the error monitoring result is that the capacitive voltage transformer has an error; if the voltage three-phase vector and coordinates corresponding to the current three-phase voltage signal do not exceed the circular boundary region and the rectangular boundary region, determining that the error monitoring result is that the capacitive voltage transformer has no error.

[0086] wherein, for the voltage three-phase vector and coordinates corresponding to the current three-phase voltage signal (assuming point A), the out-of-tolerance determination is performed in the following manner:

[0087] According to the circular boundary region, assuming that the distance from point A to the cluster center is d, if , it indicates that point A does not exceed the circular boundary region, and it is determined that the capacitive voltage transformer has no error; if , it indicates that point A exceeds the circular boundary region, and it is determined that the capacitive voltage transformer has an error.

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

[0089] In an alternative implementation, the out-of-tolerance determination can be performed according to the circular boundary region alone, or according to the rectangular boundary region alone, or according to both the circular boundary region and the rectangular boundary region, that is, if point A exceeds the circular boundary region or the rectangular boundary region, it is determined that the capacitive voltage transformer has an error, otherwise it is considered that the capacitive voltage transformer has no error.

[0090] In an exemplary embodiment, step 114 includes: in the case where the ratio between the half long axis of the long axis and the half short axis of the short axis is less than a preset threshold, performing 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 region to obtain an error monitoring result.

[0091] In a case where the ratio between the half long axis of the long axis and the half short axis of the short axis is greater than or equal to a preset threshold value, a voltage three-phase vector corresponding to the current three-phase voltage signal is subjected to an out-of-tolerance judgment according to a rectangular boundary region, and an error monitoring result is obtained.

[0092] wherein the preset threshold value is a critical value for judging the size of the ratio, which is set in advance according to actual conditions, and is assumed to be m, if then a judgment is made according to a circular boundary region, that is, assuming that the distance from the point A to the clustering center is d, if it indicates that the point A does not exceed the circular boundary region, and it is determined that the capacitive voltage transformer does not have an error; if it indicates that the point A exceeds the circular boundary region, and it is determined that the capacitive voltage transformer has an error.

[0093] if then a judgment is made according to a rectangular boundary region, that is, assuming that the distance from the point A to the long axis is d1 and the distance from the point A to the short axis is d2, if it indicates that the point A does not exceed the rectangular boundary region, and it is determined that the capacitive voltage transformer does not have an error; if it indicates that the point A exceeds the rectangular boundary region, and it is determined that the capacitive voltage transformer has an error.

[0094] Exemplarily, m = 2, if then a judgment is made according to the circular boundary region; if then a judgment is made according to the rectangular boundary region.

[0095] In the embodiment, two kinds of steady-state control domain boundary forms of a circle and a rectangle are provided, and the mechanism of selecting the judgment method according to the ratio of the long axis and the short axis can be flexibly adjusted according to the characteristics and needs of the actual power system, thereby enhancing the applicability of the method provided in the embodiment in different power system scenarios.

[0096] It should be understood that, although each step in the flowchart involved in each embodiment as described above is displayed in sequence according to the arrow, these steps are not necessarily executed in sequence according to 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 sequences. Moreover, at least part of the steps in the flowchart involved in each embodiment as described above 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 sequence of these steps or stages is not necessarily sequential, but can be executed in rotation or alternation with at least part of other steps or steps or stages in other steps.

[0097] Based on the same inventive concept, the application further provides an error monitoring device of a capacitive voltage transformer for implementing the error monitoring method of the capacitive voltage transformer as described above. The implementation scheme for solving the problem provided by the device is similar to the implementation scheme described in the above method, so the specific limitations in one or more error monitoring device embodiments of the capacitive voltage transformer provided below can refer to the limitations of the error monitoring method of the capacitive voltage transformer described above, which will not be described here.

[0098] In one exemplary embodiment, as shown in Figure 3 An error monitoring device of a capacitive voltage transformer is provided, comprising:

[0099] The data acquisition module 302 is configured to acquire a plurality of three-phase voltage signals in a preset time period, and calculate voltage three-phase vector sums and coordinates corresponding to the plurality of three-phase voltage signals, respectively.

[0100] The data processing module 304 is configured to determine a cluster center according to the voltage three-phase vector sums and coordinates corresponding to the plurality of three-phase voltage signals, respectively; sort the voltage three-phase vector sums and coordinates corresponding to the plurality of three-phase voltage signals according to the distance between each voltage three-phase vector sum and coordinate and the cluster center; and determine a boundary point coordinate according to a sorting result.

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

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

[0103] In the error monitoring device of the capacitive voltage transformer as described above, the voltage three-phase vector sums and coordinates are accurately calculated, and the stable control domain of the CVT is accurately divided, so that the stable range of the three-phase voltage of the power system can be more accurately reflected. The out-of-tolerance determination based on the circular boundary region and the rectangular boundary region accurately divided can reduce the misjudgment and omission, and is helpful to timely discover the abnormality in the power system, provide a reliable basis for the fault diagnosis and maintenance of the power system, and effectively guarantee the safe and stable operation of the power system.

[0104] In one exemplary embodiment, the three-phase voltage signal includes a first-phase voltage, a second-phase voltage, and a third-phase voltage, and the data processing module 304 is further configured to calculate the voltage three-phase vector sum and coordinate by the following formula:

[0105] ;

[0106] wherein (x, y) represents a voltage three-phase vector sum coordinate, represents an amplitude of the first phase voltage, represents a phase of the first phase voltage, represents an amplitude of the second phase voltage, represents a phase of the second phase voltage, represents an amplitude of the third phase voltage, represents a phase of the third phase voltage.

[0107] In an example embodiment, the data processing module 304 is further configured to select a plurality of voltage three-phase vector sum coordinates in front of the sorting according to the set limit value from the sorting results from small to large; and determine the voltage three-phase vector sum coordinate with the largest distance from the clustering center as the boundary point coordinate among the selected plurality of voltage three-phase vector sum coordinates.

[0108] In an example embodiment, the boundary determination module 306 is further configured to calculate a first slope and a first intercept according to the clustering center and the boundary point coordinate, determine a long axis according to the first slope and the first intercept, and determine the distance between the boundary point coordinate and the clustering center as a half long axis; determine a second slope and a second intercept according to the clustering center and the first slope, determine a short axis according to the second slope and the second intercept; calculate the distance between each voltage three-phase vector sum coordinate in the set range and the long axis; determine the maximum distance calculated as a half short axis; and determine a rectangular boundary region according to the long axis, the half long axis, the short axis, and the half short axis.

[0109] In an example embodiment, the determination module 308 is further configured to determine that the error monitoring result is that the capacitance voltage transformer has an error if the voltage three-phase vector sum coordinate corresponding to the current three-phase voltage signal exceeds the circular boundary region or the rectangular boundary region; and determine that the error monitoring result is that the capacitance voltage transformer does not have an error if the voltage three-phase vector sum coordinate corresponding to the current three-phase voltage signal does not exceed the circular boundary region and the rectangular boundary region.

[0110] In an example embodiment, the determination module 308 is further configured to perform an out-of-tolerance determination on the voltage three-phase vector sum coordinate corresponding to the current three-phase voltage signal according to the circular boundary region to obtain the error monitoring result in a case where the ratio between the half long axis of the long axis and the half short axis of the short axis is less than a preset threshold; and perform an out-of-tolerance determination on the voltage three-phase vector sum coordinate corresponding to the current three-phase voltage signal according to the rectangular boundary region to obtain the error monitoring result in a case where the ratio between the half long axis of the long axis and the half short axis of the short axis is greater than or equal to the preset threshold.

[0111] The modules in the error monitoring device of the capacitive voltage transformer can be implemented by software, hardware, or a combination thereof. The modules can be embedded in or independent of a processor in the electronic device in hardware form, or stored in a memory in the electronic device in software form, so that the processor can call and execute the operations corresponding to the modules.

[0112] In an example embodiment, an electronic device, which can be a server, has an internal structure as shown in Figure 4 The electronic device includes a processor, a memory, an input / output interface, and a communication interface. The processor, the memory, and the input / output interface are connected by a system bus, and the communication interface is connected to the system bus through the input / output interface. The processor of the electronic device provides 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 operating system and the computer program in the non-volatile storage medium to run. The input / output interface of the electronic device is used to exchange information between the processor and external devices. The communication interface of the electronic device is used to communicate with external terminals through network connection. The computer program is executed by the processor to implement an error monitoring method for a capacitive voltage transformer.

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

[0114] In an example embodiment, an electronic device is provided, which includes a memory and a processor. The memory stores a computer program. When the processor executes the computer program, the following steps are implemented: acquiring a plurality of three-phase voltage signals in a preset time period, calculating voltage three-phase vector and coordinates corresponding to the plurality of three-phase voltage signals respectively; determining a cluster center according to the voltage three-phase vector and coordinates corresponding to the plurality of three-phase voltage signals respectively; sorting the voltage three-phase vector 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; determining a boundary point coordinate according to the sorting result; determining a circular boundary region according to the cluster center and the boundary point coordinate; calculating a long axis and a short axis based on the cluster center and the boundary point coordinate, and determining a rectangular boundary region based on the long axis and the short axis; and performing an out-of-tolerance judgment on the voltage three-phase vector and coordinates corresponding to a current three-phase voltage signal based on the circular boundary region and the rectangular boundary region, to obtain an error monitoring result.

[0115] In one embodiment, the processor, when executing the computer program, further implements the following steps: the three-phase voltage signal comprises a first phase voltage, a second phase voltage and a third phase voltage, and the voltage three-phase vector sum coordinate is calculated by the following formula:

[0116] ;

[0117] wherein (x, y) represents the voltage three-phase vector sum coordinate, 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.

[0118] In one embodiment, the processor, when executing the computer program, further implements the following steps: according to the set limit value, a plurality of voltage three-phase vector sum coordinates with high ranks are selected from the results sorted from small to large distances; and the voltage three-phase vector sum coordinate with the largest distance from the cluster center among the selected voltage three-phase vector sum coordinates is determined as the boundary point coordinate.

[0119] In one embodiment, the processor, when executing the computer program, further implements the following steps: according to the cluster center and the boundary point coordinate, a first slope and a first intercept are calculated, a long axis is determined according to the first slope and the first intercept, and a distance between the boundary point coordinate and the cluster center is determined as a half long axis; a second slope and a second intercept are determined according to the cluster center and the first slope, a short axis is determined according to the second slope and the second intercept; a distance between each voltage three-phase vector sum coordinate within the set range and the long axis is calculated; the largest distance calculated is determined as a half short axis; and a rectangular boundary region is determined according to the long axis, the half long axis, the short axis and the half short axis.

[0120] In one embodiment, the processor, when executing the computer program, further implements the following steps: if the voltage three-phase vector sum coordinate corresponding to the current three-phase voltage signal exceeds the circular boundary region or the rectangular boundary region, it is determined that the error monitoring result is that the capacitive voltage transformer has an error; and if the voltage three-phase vector sum coordinate corresponding to the current three-phase voltage signal does not exceed the circular boundary region and the rectangular boundary region, it is determined that the error monitoring result is that the capacitive voltage transformer has no error.

[0121] In one embodiment, the processor, when executing the computer program, also implements the following steps: in a case where the ratio between the half long axis of the long axis line and the half short axis of the short axis line is less than a preset threshold, performing an out-of-tolerance judgment on the voltage three-phase vector sum coordinate corresponding to the current three-phase voltage signal according to the circular boundary region to obtain an error monitoring result; and in a case where the ratio between the half long axis of the long axis line and the half short axis of the short axis line is greater than or equal to the preset threshold, performing an out-of-tolerance judgment on the voltage three-phase vector sum coordinate corresponding to the current three-phase voltage signal according to the rectangular boundary region to obtain an error monitoring result.

[0122] In one embodiment, a computer readable storage medium is provided, and the computer readable storage medium stores a computer program. The computer program, when executed by a processor, implements the following steps: collecting a plurality of three-phase voltage signals in a preset time period, and calculating voltage three-phase vector sum coordinates corresponding to the plurality of three-phase voltage signals respectively; determining a cluster center according to the voltage three-phase vector sum coordinates corresponding to the plurality of three-phase voltage signals respectively; sorting the voltage three-phase vector sum coordinates corresponding to the plurality of three-phase voltage signals respectively according to distances between each voltage three-phase vector sum coordinate and the cluster center; determining boundary point coordinates according to a sorting result; determining a circular boundary region according to the cluster center and the boundary point coordinates; calculating a long axis line and a short axis line according to the cluster center and the boundary point coordinates, and determining a rectangular boundary region based on the long axis line and the short axis line; and performing an out-of-tolerance judgment on a voltage three-phase vector sum coordinate corresponding to a current three-phase voltage signal based on the circular boundary region and the rectangular boundary region to obtain an error monitoring result.

[0123] In one embodiment, the computer program, when executed by the processor, also implements the following steps: 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 sum coordinate is calculated by the following formula:

[0124] ;

[0125] wherein (x, y) represents the voltage three-phase vector sum coordinate, represents an amplitude of the first phase voltage, represents a phase of the first phase voltage, represents an amplitude of the second phase voltage, represents a phase of the second phase voltage, represents an amplitude of the third phase voltage, represents a phase of the third phase voltage.

[0126] In one embodiment, the computer program, when executed by the processor, also implements the following steps: selecting a number of voltage three-phase vector sum coordinates in front of the sorting result from small to large distances according to a set limit; and determining, as the boundary point coordinates, the voltage three-phase vector sum coordinate with the largest distance from the cluster center among the selected number of voltage three-phase vector sum coordinates.

[0127] In one embodiment, the computer program, when executed by the processor, further implements the following steps: calculating a first slope and a 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 semi-major axis as the distance between the boundary point coordinates and the cluster center; determining a second slope and a second intercept according to the cluster center and the first slope, determining the minor axis according to the second slope and the second intercept; calculating the distance between each voltage three-phase vector sum coordinate within the set range and the major axis; determining the maximum distance calculated as the semi-minor axis; and determining the rectangular boundary region according to the major axis, the semi-major axis, the minor axis, and the semi-minor axis.

[0128] In one embodiment, the computer program, when executed by the processor, further implements the following steps: if the voltage three-phase vector sum coordinate corresponding to the current three-phase voltage signal exceeds the circular boundary region or the rectangular boundary region, determining that the error monitoring result is that the capacitive voltage transformer has an error; and if the voltage three-phase vector sum coordinate corresponding to the current three-phase voltage signal does not exceed the circular boundary region and the rectangular boundary region, determining that the error monitoring result is that the capacitive voltage transformer has no error.

[0129] In one embodiment, the computer program, when executed by the processor, further implements the following steps: in the case where 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 sum coordinate corresponding to the current three-phase voltage signal according to the circular boundary region to obtain an error monitoring result; and in the case where 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, performing an out-of-tolerance determination on the voltage three-phase vector sum coordinate corresponding to the current three-phase voltage signal according to the rectangular boundary region 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 a plurality of three-phase voltage signals within a preset time period, and calculating voltage three-phase vector sum coordinates corresponding to the plurality of three-phase voltage signals respectively; determining a cluster center according to the voltage three-phase vector sum coordinates corresponding to the plurality of three-phase voltage signals respectively; sorting the voltage three-phase vector sum coordinates corresponding to the plurality of three-phase voltage signals respectively according to the distance between each voltage three-phase vector sum coordinate and the cluster center; determining boundary point coordinates according to the sorting result; determining a circular boundary region according to the cluster center and the boundary point coordinates; determining a major axis and a minor axis according to the cluster center and the boundary point coordinates, and determining a rectangular boundary region based on the major axis and the minor axis; and performing an out-of-tolerance determination on a voltage three-phase vector sum coordinate corresponding to a current three-phase voltage signal based on the circular boundary region and the rectangular boundary region to obtain an error monitoring result.

[0131] In one embodiment, the computer program, when executed by the processor, further implements the following steps: the three-phase voltage signal comprises a first phase voltage, a second phase voltage and a third phase voltage, and the voltage three-phase vector sum coordinate is calculated by the following formula:

[0132] ;

[0133] wherein (x, y) represents the voltage three-phase vector sum coordinate, 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.

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

[0135] In one embodiment, the computer program, when executed by the processor, further implements the following steps: according to the cluster center and the boundary point coordinate, a first slope and a first intercept are calculated, a long axis is determined according to the first slope and the first intercept, and a distance between the boundary point coordinate and the cluster center is determined as a half long axis; a second slope and a second intercept are determined according to the cluster center and the first slope, a short axis is determined according to the second slope and the second intercept; a distance between each voltage three-phase vector sum coordinate in the set range and the long axis is calculated; the largest distance calculated is determined as a half short axis; and a rectangular boundary region is determined according to the long axis, the half long axis, the short axis and the half short axis.

[0136] In one embodiment, the computer program, when executed by the processor, further implements the following steps: if the voltage three-phase vector sum coordinate corresponding to the current three-phase voltage signal exceeds the circular boundary region or the rectangular boundary region, it is determined that the error monitoring result is that the capacitive voltage transformer has an error; and if the voltage three-phase vector sum coordinate corresponding to the current three-phase voltage signal does not exceed the circular boundary region and the rectangular boundary region, it is determined that the error monitoring result is that the capacitive voltage transformer has no error.

[0137] In one embodiment, the computer program, when executed by the processor, further implements the following steps: in a case where the ratio between the half long axis of the long axis line and the half short axis of the short axis line 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 region to obtain an error monitoring result; and in a case where the ratio between the half long axis of the long axis line and the half short axis of the short axis line is greater than or equal to the 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 rectangular boundary region to obtain an error monitoring result.

[0138] Those skilled in the art can understand that all or part of the processes in the above-mentioned embodiments can be completed by a computer program instructing related hardware. The computer program can be stored in a non-volatile computer readable storage medium. When the computer program is executed, the processes of the above-mentioned embodiments can be included. In each embodiment provided in the present application, the memory, database or other medium can include at least one of a non-volatile memory and a volatile memory. The non-volatile memory can include a read-only memory (ROM), a tape, a floppy disk, a flash memory, an optical memory, a high-density embedded non-volatile memory, a resistive random access memory (ReRAM), a magnetoresistive random access memory (MRAM), a ferroelectric random access memory (FRAM), a phase change memory (PCM), a graphene memory, etc. The volatile memory can include a random access memory (RAM) or an external cache memory, etc. As an illustration but not limitation, the RAM can be in various forms, such as a static random access memory (SRAM) or a dynamic random access memory (DRAM), etc. The database involved in each embodiment provided in 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., but is not limited thereto. The processor involved in each embodiment provided in 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., but is not limited thereto.

[0139] Any technical features in the above embodiments can be combined, and for the sake of brevity, not all possible combinations are described above, however, any combination of these technical features is deemed to be within the scope of the present application.

[0140] The above embodiments only express several implementation manners of the present application, and the description is relatively specific and detailed, but it should not be understood as a limitation on the patent scope of the present application. It should be pointed out that, for ordinary skilled persons in the art, several modifications and improvements can be made without departing from the concept of the present application, and these 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 method for error monitoring of a capacitive voltage transformer, characterized in that, The method includes: Collect multiple three-phase voltage signals within a preset time period, and calculate the voltage three-phase vector and coordinates corresponding to the multiple three-phase voltage signals respectively; Based on the voltage three-phase vectors and coordinates corresponding to the multiple three-phase voltage signals, the cluster centers are determined; Based on the distance between each voltage three-phase vector and coordinate and the cluster center, the voltage three-phase vectors and coordinates corresponding to the plurality of three-phase voltage signals are sorted respectively; Determine the coordinates of the boundary points based on the sorting results; The circular boundary region is determined based on the cluster centers and the coordinates of the boundary points; Based on the coordinates of the cluster centers and the boundary points, the major axis and the minor axis are calculated, and the rectangular boundary region is determined based on the major axis and the minor axis. Based on the circular boundary region and the rectangular boundary region, 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.

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 three-phase voltage vector and coordinates are calculated using the following formula: ； Where (x,y) represents the three-phase voltage vector and coordinates. This indicates the amplitude of the first phase voltage. This indicates the phase of the first phase voltage. This indicates the amplitude of the second phase voltage. This indicates the phase of the second phase voltage. This indicates the amplitude of the third phase voltage. This indicates the phase of the third phase voltage.

3. The method according to claim 1, characterized in that, The step of determining the boundary point coordinates based on the sorting results includes: Based on the set limits, select the top-ranked three-phase voltage vectors and coordinates from the sorted results in ascending order of distance; The voltage three-phase vector and coordinates that have 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, characterized in that, The step of calculating the major and minor axes based on the coordinates of the cluster centers and the boundary points, and determining the rectangular boundary region based on the major and minor axes, includes: Based on the coordinates of the cluster center and the boundary point, calculate the first slope and the first intercept, 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; Based on the cluster centers and the first slope, a second slope and a second intercept are determined, and the minor axis is determined based on the second slope and the second intercept. Calculate the distance between the three-phase vector and coordinate of each voltage within the set range and the long axis; The calculated maximum distance is defined as the semi-minor axis; The rectangular boundary region is determined based on 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, Based on the circular boundary region and the rectangular boundary region, 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: 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 the error monitoring result is determined to be that there is an error in the capacitive voltage transformer. If the voltage three-phase vector and coordinates corresponding to the current three-phase voltage signal do not exceed the circular boundary region and the rectangular boundary region, then the error monitoring result is determined to be that the capacitive voltage transformer has no error.

6. The method according to any one of claims 1 to 4, characterized in that, Based on the circular boundary region and the rectangular boundary region, 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: 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 region, and the error monitoring result is obtained. 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 to be out of tolerance based on the rectangular boundary region, and the error monitoring result is obtained.

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

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

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

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

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