Method and device for evaluating influence of multiple interference sources on error of capacitive voltage transformer, electronic equipment and storage medium

Abstract

The invention discloses a method and device for evaluating the influence of multiple interference sources on the error of a capacitive voltage transformer, electronic equipment and a storage medium, and belongs to the technical field of high-voltage power measurement. The equivalent circuit is applied to the capacitive voltage transformer, and comprises a capacitive voltage dividing module and an electromagnetic module, the capacitive voltage dividing module comprises a high-voltage capacitor C1 and a low-voltage capacitor C2, and the electromagnetic module comprises a compensation reactor L, a transformer T and a damper D; one end of the high-voltage capacitor C1 is connected with the voltage end U1, and the other end of the high-voltage capacitor C1 is grounded through the low-voltage capacitor C2; the other end of the high-voltage capacitor C1 is connected with a first terminal a of a primary winding of the transformer T through a compensation reactor L, and a second terminal b of the primary winding is grounded; a secondary winding of the transformer T is connected with a damper D; the method comprises the following steps: constructing a Pearson correlation analysis model for the capacitor voltage transformer based on a plurality of interference factors; based on a Pearson correlation analysis model, analyzing the error influence factor of each interference factor, and determining the influence degree of each interference factor on the capacitive voltage transformer; based on the influence degree, the measurement error of the capacitive voltage transformer is evaluated through the coupling effect of multiple interference sources, and the multiple interference sources comprise two or more interference factors. According to the method, dynamic and accurate evaluation of the CVT measurement error is realized.

Description

Technical Field

[0001] This application belongs to the technical field of high-voltage power measurement, and particularly relates to an evaluation method, device, electronic device and storage medium for the influence of multiple interference sources on the error of a capacitive voltage transformer. Background Art

[0002] In high-voltage metering equipment of a power system, a capacitive voltage transformer (CVT) is one of the core components, and its measurement accuracy directly affects the metering accuracy of electric energy. When operating in a high-voltage power transmission environment, the CVT is susceptible to the influence of various external interference factors. These factors may cause changes in the ratio error and phase angle error of the CVT, resulting in metering errors and affecting the fairness of power trading settlement and electricity-carbon trading.

[0003] Currently, in the analysis of CVT measurement errors, single factors or specific experimental conditions are mostly used for evaluation, and the interaction and comprehensive influence of multiple interference factors are usually not fully considered.

[0004] However, existing research lacks a systematic analysis of the correlation of these factors and their influence mechanism on errors, making it difficult to achieve dynamic and accurate evaluation of CVT measurement errors. Summary of the Invention

[0005] This application aims to solve at least one of the technical problems existing in the prior art. For this purpose, this application proposes an evaluation method, device, electronic device and storage medium for the influence of multiple interference sources on the error of a capacitive voltage transformer, achieving dynamic and accurate evaluation of CVT measurement errors.

[0006] In a first aspect, this application provides an evaluation method for the influence of multiple interference sources on the error of a capacitive voltage transformer, which is applied to a capacitive voltage transformer. The equivalent circuit of the capacitive voltage transformer includes a capacitive voltage division module and an electromagnetic module;

[0007] The capacitive voltage division module includes a high-voltage capacitor C 1 and a low-voltage capacitor C 2 , and the electromagnetic module includes a compensation reactor L, a transformer T, and a damper D;

[0008] One end of the high-voltage capacitor C 1 is connected to the voltage terminal U 1 , and the other end of the high-voltage capacitor C 1 is grounded through the low-voltage capacitor C 2 ;

[0009] One end of the high-voltage capacitor C 1The other end thereof is connected to the first terminal a of the primary winding of the transformer T through a compensating reactor L, and the second terminal b of the primary winding is grounded;

[0010] The secondary winding of the transformer T is connected to a damper D;

[0011] The method includes:

[0012] Based on multiple interference factors, a Pearson correlation analysis model is constructed for the capacitive voltage transformer;

[0013] Based on the Pearson correlation analysis model, the error influence factors of each interference factor are analyzed to determine the influence degree of each interference factor on the capacitive voltage transformer;

[0014] Based on the influence degree, the measurement error of the capacitive voltage transformer is evaluated through the coupling effect of multiple interference sources, and the multiple interference sources include two or more of the interference factors.

[0015] According to an embodiment of the present application, based on the Pearson correlation analysis model, the error influence factors of each interference factor are analyzed to determine the influence degree of each interference factor on the capacitive voltage transformer, including:

[0016] Through the Pearson correlation analysis model, a correlation analysis is performed between the error influence factor and the error of the capacitive voltage transformer to obtain the influence parameter in the error of the capacitive voltage transformer corresponding to each interference factor;

[0017] According to the influence parameter, the influence degree of each interference factor on the said is determined.

[0018] According to an embodiment of the present application, the interference factors include the system frequency factor, temperature factor, humidity factor and electric field factor of the capacitive voltage transformer;

[0019] The error influence factor of the system frequency factor is the system frequency, the error influence factor of the temperature factor is the temperature, the error influence factor of the humidity factor is the insulation state, and the error influence factor of the electric field factor is the stray capacitance.

[0020] According to an embodiment of the present application, when the interference factors are the system frequency factor, temperature factor and humidity factor, the influence parameters are the angular difference and ratio difference;

[0021] When the interference factor is the electric field factor, the influence parameter is the voltage division ratio.

[0022] According to an embodiment of the present application, according to the influence parameter, the influence degree of each interference factor on the said is determined, including:

[0023] Determine the correlation coefficient between the interference factor and the error of the capacitive voltage transformer according to the influence parameter;

[0024] Determine the degree of influence based on the correlation coefficient.

[0025] According to an embodiment of the present application, the correlation coefficient r is:

[0026]

[0027] where n is the sample size, X i is the ratio error sample value corresponding to different factor influences, and Y i is the angular error sample value corresponding to different factor influences, both being their sample means.

[0028] According to an embodiment of the present application, based on the degree of influence, evaluate the measurement error of the capacitive voltage transformer through the coupling action of multiple interference sources, including:

[0029] Based on the degree of influence, screen the multiple interference factors to determine the target interference factor;

[0030] Superpose and couple the target interference factor to evaluate the measurement error of the capacitive voltage transformer.

[0031] In a second aspect, the present application provides an evaluation device for the influence of multiple interference sources on the error of a capacitive voltage transformer, which is applied to a capacitive voltage transformer. The equivalent circuit of the capacitive voltage transformer includes a capacitive voltage division module and an electromagnetic module;

[0032] The capacitive voltage division module includes a high-voltage capacitor C 1 and a low-voltage capacitor C 2 , and the electromagnetic module includes a compensating reactor L, a transformer T, and a damper D;

[0033] One end of the high-voltage capacitor C 1 is connected to the voltage terminal U 1 , and the other end of the high-voltage capacitor C 1 is grounded through the low-voltage capacitor C 2 ;

[0034] The other end of the high-voltage capacitor C 1 is connected to the first connection terminal a of the primary winding of the transformer T through the compensating reactor L, and the second connection terminal b of the primary winding is grounded;

[0035] The secondary winding of the transformer T is connected to the damper D;

[0036] The device includes:

[0037] A first processing module, configured to construct a Pearson correlation analysis model for a capacitive voltage transformer based on multiple interference factors;

[0038] A second processing module, configured to analyze the error influence factor of each of the interference factors based on the Pearson correlation analysis model, and determine the influence degree of each of the interference factors on the capacitive voltage transformer;

[0039] A third processing module, configured to evaluate the measurement error of the capacitive voltage transformer through the coupling effect of multiple interference sources based on the influence degree, where the multiple interference sources include two or more of the interference factors.

[0040] In a third aspect, the present application provides an electronic device, including a memory, a processor, and a computer program stored on the memory and executable on the processor. When the processor executes the computer program, the method for evaluating the influence of multiple interference sources on the error of a capacitive voltage transformer as described in the first aspect above is implemented.

[0041] In a fourth aspect, the present application provides a non-transitory computer-readable storage medium, on which a computer program is stored. When the computer program is executed by a processor, the method for evaluating the influence of multiple interference sources on the error of a capacitive voltage transformer as described in the first aspect above is implemented.

[0042] In a fifth aspect, the present application provides a chip, which includes a processor and a communication interface. The communication interface is coupled to the processor, and the processor is configured to run a program or an instruction to implement the method for evaluating the influence of multiple interference sources on the error of a capacitive voltage transformer as described in the first aspect.

[0043] In a sixth aspect, the present application provides a computer program product, including a computer program. When the computer program is executed by a processor, the method for evaluating the influence of multiple interference sources on the error of a capacitive voltage transformer as described in the first aspect above is implemented.

[0044] Additional aspects and advantages of the present application will be given in part in the following description, become apparent in part from the following description, or be understood through the practice of the present application.

[0045] The method, device, electronic device, and storage medium for evaluating the influence of multiple interference sources on the error of a capacitive voltage transformer provided by the present application have the following beneficial effects compared with the prior art:

[0046] (1) Quantify the influence degree and interaction of multiple interference factors in the environment on the CVT measurement error through Pearson correlation analysis, which can accurately and reliably dynamically evaluate and quantify the change trend of the CVT measurement error, determine different interference factors and their correlations, clarify the main influencing factors, evaluate the generation mechanism and its influence of the CVT measurement error in a theoretical way, provide a theoretical basis for the error monitoring, accuracy evaluation and error control of the CVT in the high-voltage electric energy metering device, and further optimize the accuracy and reliability of electric energy metering.

[0047] (2) Conduct quantitative analysis on the correlations of various factors such as system frequency, temperature, electric field and humidity through Pearson correlation analysis method, so as to evaluate their influence intensity and correlation size, reveal the influence degree and change law of each factor on the CVT error. It can be clarified that among multiple interference factors, there is a strong positive correlation between temperature and the CVT error. Temperature has a greater influence on the ratio error and phase angle error of the CVT. The increase in temperature will cause fluctuations in the ratio error and phase angle error of the CVT, and this influence can be described by the temperature coefficient and the ratio error equation; there is a strong negative correlation between the electric field and the error. Electric field interference will lead to the formation of stray capacitance, which will in turn change the capacitance voltage division ratio and the accuracy of the output voltage. The actual voltage division ratio formula is introduced for the stray capacitance to explain the influence of the electric field on the CVT performance under different operating conditions; at the same time, it is also verified that humidity has a moderate negative correlation influence on the error and vibration has a very weak correlation influence. Humidity has a certain negative correlation influence on the CVT error, while the influence of vibration on the error is relatively small and can be ignored under certain conditions. Description of the Drawings

[0048] The above and / or additional aspects and advantages of the present application will become obvious and easy to understand from the description of the embodiments in conjunction with the following drawings, where:

[0049] Figure 1 is a schematic structural diagram of the CVT equivalent circuit provided by the embodiment of the present application;

[0050] Figure 2 is a schematic flowchart of the evaluation method for the influence of multiple interference sources on the error of the capacitive voltage transformer provided by the embodiment of the present application;

[0051] Figure 3 is a graph showing the change of the CVT ratio error with frequency provided by the embodiment of the present application;

[0052] Figure 4 is a graph showing the change of the CT ratio error and phase angle error with the ambient temperature provided by the embodiment of the present application;

[0053] Figure 5 is a graph showing the change of the CVT ratio error with the dielectric loss provided by the embodiment of the present application;

[0054] Figure 6It is a graph of the calculation results of the stray capacitance error of the CVT provided by an embodiment of the present application;

[0055] Figure 7 It is a heat map of the correlation coefficient of the error data of multiple interference sources of the CVT provided by an embodiment of the present application;

[0056] Figure 8 It is a schematic structural diagram of an evaluation device for the influence of multiple interference sources on the error of a capacitive voltage transformer provided by an embodiment of the present application;

[0057] Figure 9 It is a schematic structural diagram of an electronic device provided by an embodiment of the present application. Detailed implementation manners

[0058] Next, the technical solutions in the embodiments of the present application will be clearly described in conjunction with the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art belong to the scope of protection of the present application.

[0059] The terms "first", "second", etc. in the specification and claims of the present application are used to distinguish similar objects, rather than to describe a specific order or sequence. It should be understood that such data can be interchanged under appropriate circumstances so that the embodiments of the present application can be implemented in an order other than those illustrated or described herein, and the objects distinguished by "first", "second", etc. generally belong to the same category, and do not limit the number of objects. For example, the first object can be one or multiple. In addition, "and / or" in the specification and claims means at least one of the connected objects, and the character " / " generally indicates an "or" relationship between the associated objects before and after.

[0060] Next, in conjunction with the accompanying drawings, through specific embodiments and their application scenarios, the evaluation method for the influence of multiple interference sources on the error of a capacitive voltage transformer, the evaluation device for the influence of multiple interference sources on the error of a capacitive voltage transformer, the electronic device, and the readable storage medium provided by the embodiments of the present application will be described in detail.

[0061] Among them, the evaluation method for the influence of multiple interference sources on the error of a capacitive voltage transformer can be applied to a terminal, and can be specifically executed by hardware or software in the terminal.

[0062] The terminal includes, but is not limited to, portable communication devices such as mobile phones or tablets with a touch-sensitive surface (for example, a touch screen display and / or a touchpad). It should also be understood that in some embodiments, the terminal may not be a portable communication device, but a desktop computer with a touch-sensitive surface (for example, a touch screen display and / or a touchpad).

[0063] In each of the following embodiments, a terminal including a display and a touch-sensitive surface is described. However, it should be understood that the terminal may include one or more other physical user interface devices such as a physical keyboard, a mouse, and a joystick.

[0064] The evaluation method for the influence of multiple interference sources on the error of a capacitive voltage transformer provided in the embodiments of this application. The execution subject of this evaluation method for the influence of multiple interference sources on the error of a capacitive voltage transformer can be an electronic device or a functional module or functional entity in the electronic device that can implement this evaluation method for the influence of multiple interference sources on the error of a capacitive voltage transformer. The electronic devices mentioned in the embodiments of this application include but are not limited to mobile phones, tablet computers, computers, cameras, and wearable devices, etc. Hereinafter, taking the electronic device as the execution subject, the evaluation method for the influence of multiple interference sources on the error of a capacitive voltage transformer provided in the embodiments of this application will be described.

[0065] Among them, the evaluation method for the influence of multiple interference sources on the error of a capacitive voltage transformer is applied to a capacitive voltage transformer. As Figure 1 shown, the equivalent circuit of the capacitive voltage transformer includes a capacitive voltage division module and an electromagnetic module;

[0066] The capacitive voltage division module includes a high-voltage capacitor C1 and a low-voltage capacitor C2, and the electromagnetic module includes a compensating reactor L, a transformer T, and a damper D;

[0067] One end of the high-voltage capacitor C1 is connected to the voltage terminal U1, and the other end of the high-voltage capacitor C1 is grounded through the low-voltage capacitor C2;

[0068] The other end of the high-voltage capacitor C1 is connected to the first terminal a of the primary winding of the transformer T through the compensating reactor L, and the second terminal b of the primary winding is grounded;

[0069] The secondary winding of the transformer T is connected to the damper D;

[0070] In actual execution, the capacitive voltage division module divides the input high voltage U1 into a low-voltage signal U3 through the series-connected high-voltage capacitor C1 and low-voltage capacitor C2, and the electromagnetic module can convert the low-voltage signal U3 into a standard measurement signal U2, so as to realize the measurement of the high voltage U1.

[0071] As Figure 2 shown, this evaluation method for the influence of multiple interference sources on the error of a capacitive voltage transformer includes:

[0072] Step 210: Build a Pearson correlation analysis model for the capacitive voltage transformer based on multiple interference factors;

[0073] Step 220: Based on the Pearson correlation analysis model, analyze the error influence factors of each interference factor to determine the influence degree of each interference factor on the capacitive voltage transformer.

[0074] Step 230: Based on the influence degree, evaluate the measurement error of the capacitive voltage transformer through the coupling effect of multiple interference sources, where the multiple interference sources include two or more of the interference factors.

[0075] It should be noted that under the influence of the external environment, especially the superposition of factors such as temperature, electric field, and humidity, the internal capacitance characteristics of the CVT may be significantly changed, resulting in an increase in error fluctuations.

[0076] In actual implementation, quantitatively evaluate the influence of environmental factors such as system frequency, temperature, electric field, humidity, and vibration on the measurement error of the capacitive voltage transformer (CVT).

[0077] By calculating the correlation between factors such as temperature, electric field, humidity, and vibration and the CVT error, the influence degree of each factor on the ratio error and phase angle error can be obtained. It can be determined that the electric field has the greatest influence on the CVT error, followed by temperature, then humidity, and the influence of the system frequency is the lowest. Based on this, the CVT error monitoring and evaluation criteria can be formulated.

[0078] According to the influence degree, couple and superimpose multiple interference sources composed of multiple interference factors to evaluate the measurement error of the capacitive voltage transformer.

[0079] For the coupling effect of multiple interference sources, use multi-dimensional data analysis technology to analyze the combined influence of the corresponding interference sources of each interference source on the CVT error under different environmental conditions. By constructing an error correlation heat map, it is possible to realize the real-time dynamic evaluation of the CVT measurement error under the condition of changing operating environment, and provide a basis for subsequent error compensation and accuracy optimization.

[0080] In related technologies, the analysis of the CVT measurement error is mostly based on the test analysis under static conditions. On the basis of constructing a simulation model, through on-site testing and simulation experiments, simulate and analyze the influence of environmental factors on the CVT error, and combine with an on-line monitoring device to dynamically evaluate the operating state of the CVT. It mainly emphasizes the operating stability and error monitoring, and evaluates the error state by directly comparing the simulation data with the monitoring data, and cannot quantitatively describe the change of the error under multi-factor conditions.

[0081] According to the evaluation method for the influence of multiple interference sources on the error of capacitive voltage transformers provided by the embodiments of the present application, through Pearson correlation analysis, the influence degree and interaction of multiple interference factors in the environment on the CVT measurement error are quantified, and the changing trend of the CVT measurement error can be accurately and reliably dynamically evaluated and quantified, the different interference factors and their correlations are determined, the main influencing factors are clarified, the generation mechanism and its influence of the CVT measurement error are evaluated in a theoretical way, providing a theoretical basis for the error monitoring, accuracy evaluation and error control of CVTs in high-voltage electric energy metering devices, and further optimizing the accuracy and reliability of electric energy metering.

[0082] In some embodiments, based on the Pearson correlation analysis model, the error influence factors of each of the interference factors are analyzed to determine the influence degree of each of the interference factors on the capacitive voltage transformer, including:

[0083] Performing correlation analysis between the error influence factor and the error of the capacitive voltage transformer through the Pearson correlation analysis model to obtain the influence parameters in the error of the capacitive voltage transformer corresponding to each of the interference factors;

[0084] According to the influence parameters, determine the influence degree of each interference factor on the same.

[0085] In some embodiments, the interference factors include the system frequency factor, temperature factor, humidity factor and electric field factor of the capacitive voltage transformer;

[0086] The error influence factor of the system frequency factor is the system frequency, the error influence factor of the temperature factor is the temperature, the error influence factor of the humidity factor is the insulation state, and the error influence factor of the electric field factor is the stray capacitance.

[0087] In this embodiment, considering the multi-factor influence of the temperature factor, electric field factor, humidity factor and system frequency factor at the same time, the Pearson correlation analysis method is used to obtain the correlations of each factor, so as to more comprehensively reveal the formation mechanism of the CVT error.

[0088] In some embodiments, when the interference factors are the system frequency factor, temperature factor and humidity factor, the influence parameters are the angular difference and ratio error;

[0089] When the interference factor is the electric field factor, the influence parameter is the voltage division ratio.

[0090] In actual implementation, the relationship between the system frequency ω of any two nodes in the capacitive voltage division unit of the CVT and the ratio error f and angular difference δ output by the damper D of the secondary winding (secondary side) of the CVT is shown in the following formulas (1) and (2):

[0091]

[0092] Among them, S is the rated capacity; U 1 is the primary voltage of the primary winding; is the power factor angle; ω is the actual frequency; ω n is the rated frequency.

[0093] When the actual frequency ω increases, the frequency deviation term decreases. Therefore, both the ratio error f and the angular error δ will decrease. When the actual frequency ω decreases, the frequency deviation term increases, and both the ratio error f and the angular error δ will increase.

[0094] As Figure 3 shown, the abscissa is the frequency, with the unit of Hz, and the ordinate is the ratio error (ratio difference), with the unit of %. The ratio error of the CVT increases with the increase of the system frequency.

[0095] Through correlation analysis, the influence of temperature on the ratio error f and angular error δ of the CVT is as shown in the following formulas (3) and (4).

[0096]

[0097] Among them, ΔT is the temperature change, and β is the capacitance temperature coefficient.

[0098] As Figure 4 shown, the abscissa is the temperature, with the unit of °C, and the ordinate is the ratio error (ratio difference) f, with the unit of %. The ratio error f and angular error of the CT change with the ambient temperature, showing a trend of first decreasing and then increasing. When the ambient temperature is 0 °C, the ratio error f is the smallest, which is 0.14723%, and the minimum angular error is 1.34507. When the ambient temperature is 70 °C, the ratio error f and angular error of the CT are the largest, which are 0.21245% and 1.94083 respectively.

[0099] The humidity factor will affect the insulation state of the CVT. The poor insulation state may cause insulation damage inside the CVT, thereby affecting its measurement accuracy and stability. The relationship between the insulation state and the ratio error f and angular error δ output by the damper D of the secondary winding (secondary side) of the CVT is as shown in the following formulas (5) and (6):

[0100]

[0101] Among them, σ 1 is the phase difference of the high-voltage capacitor C 1 , and σ 2 is the phase difference of the low-voltage capacitor C 2 .

[0102] The deterioration of the insulation state causes changes in the high-voltage capacitor C1 and the low-voltage capacitor C2. When other external conditions are the same, the insulation state of the capacitive voltage division module affects the error of the CVT.

[0103] The variation of the ratio difference with the dielectric loss is as follows Figure 5 shown. When the dielectric loss value and the equivalent parallel resistance of the capacitive voltage divider module change, the ratio difference and phase difference of the CVT will shift to a certain extent. The change in the dielectric loss value will affect the loss condition of the capacitor, thereby affecting the accuracy of the CVT. The change in the equivalent parallel resistance of the capacitor will affect the equivalent resistance of the capacitor, and further affect the output characteristics of the CVT.

[0104] In this embodiment, by considering the quantification of the influence of temperature and humidity changes on the measurement error of the CVT, determining the relationship between the ratio difference and angular difference with temperature and humidity changes, the prediction of the CVT error change under different temperature and humidity conditions is realized.

[0105] The interference of the electric field will cause the generation of stray capacitance, and the stray capacitance will cause capacitive coupling between different parts inside the CVT. This capacitive coupling may generate an additional capacitive voltage division effect in the CVT circuit, thereby changing the working principle of the capacitive voltage divider module, and further affecting the voltage division ratio of the CVT. The actual voltage division ratio of the CVT considering stray capacitance is:

[0106]

[0107] where k is the actual voltage division ratio considering the influence of stray capacitance, and k 1 is the voltage division ratio in the ideal case, C is the main capacitance value of the CVT, which is the total resistance after the series connection of the high-voltage capacitor C 1 and the low-voltage capacitor C 2 . The high-voltage capacitor C 1 is the ground stray capacitance. The calculation result of the CVT stray capacitance error is as Figure 6 shown.

[0108] In this embodiment, by considering the influence of environmental electric field interference on the measurement accuracy of the CVT, including the generation of stray capacitance and its change to the capacitive voltage division ratio, and a detailed evaluation method for the influence of the electric field distribution on the measurement error is given.

[0109] In this embodiment, the Pearson correlation analysis method is used to quantitatively analyze the correlations of various factors such as system frequency, temperature, electric field, and humidity, so as to evaluate their influence intensities and correlation magnitudes, reveal the influence degrees and variation rules of each factor on the CVT error, and clarify that among multiple interference factors, there is a strong positive correlation between temperature and the CVT error. Temperature has a greater impact on the ratio error and angular error of the CVT. An increase in temperature will cause fluctuations in the ratio error and angular error of the CVT, and this influence can be described by the temperature coefficient and the ratio error equation; there is a strong negative correlation between the electric field and the error. Electric field interference will lead to the formation of stray capacitance, which in turn changes the capacitance voltage division ratio and the accuracy of the output voltage. For stray capacitance, an actual voltage division ratio formula is introduced to explain the influence of the electric field on the CVT performance under different operating conditions; at the same time, it is also verified that humidity has a moderately negative correlation with the error and vibration has a very weak correlation. Humidity has a certain negative correlation with the CVT error, while the influence of vibration on the error is relatively small and can be ignored under certain conditions.

[0110] In some embodiments, according to the influence parameters, determining the influence degree of each interference factor on the above includes:

[0111] According to the influence parameters, determining the correlation coefficient between the interference factor and the error of the capacitive voltage transformer;

[0112] Based on the correlation coefficient, determining the influence degree.

[0113] The correlation between the interference factor and the CVT error is calculated through the calculation formula of the Pearson coefficient. By analyzing the experimental data, the correlation coefficients of each interference factor are determined.

[0114] The Pearson coefficient can describe the correlation between the independent variable X and the dependent variable Y. The larger the Pearson coefficient, the stronger the correlation. The closer |r| is to 1, the higher the degree of correlation; the closer |r| is to 0, the lower the degree of correlation. When 0.9 < |r| < 1, it is highly correlated; when 0.7 < |r| < 0.9, it is strongly correlated; 0.4 < |r| < 0.7, it is moderately correlated; 0.2 < |r| < 0.4, it is weakly correlated; 0 < |r| < 0.2, it is very weakly correlated or has no correlation.

[0115] The Pearson correlation coefficient is used to analyze the influence intensities of system frequency, temperature, electric field, and humidity on the ratio error and angular error of the CVT. The calculated correlation coefficient matrix is used to quantify the influence degree of the interference factor and improve the applicability in a complex environment, which is more comprehensive and has stronger practical guiding significance.

[0116] Such as Figure 7As shown, the correlation coefficient matrix is presented in the form of a heat map. With the proposed Pearson correlation coefficient matrix and heat map, it provides convenience for users to intuitively understand and use the influence of multiple interference sources, and can be directly used for the CVT error monitoring and calibration in the field environment.

[0117] In some embodiments, the correlation coefficient r is:

[0118]

[0119] where n is the sample size, X i is the ratio error sample value under the influence of different factors, Y i is the angular error sample value under the influence of different factors, and is its sample mean.

[0120] In this embodiment, by introducing the Pearson correlation analysis method, it can effectively identify and quantify the influence degree of environmental factors such as temperature, electric field, humidity, and vibration on the CVT error, thus providing an accurate analysis tool and theoretical support for the dynamic monitoring of the CVT error in high-voltage power metering devices. Through the multi-interference source coupling analysis method, a correlation matrix of the influence of multi-dimensional interference factors on the CVT error is constructed, and key monitoring and evaluation strategies for factors such as temperature and electric field are proposed, providing a theoretical basis for the CVT error control in high-voltage power metering devices.

[0121] In some embodiments, based on the influence degree, the measurement error of the capacitive voltage transformer is evaluated through the coupling effect of multiple interference sources, including:

[0122] Based on the influence degree, screening the multiple interference factors to determine the target interference factors;

[0123] Performing superposition coupling on the target interference factors to evaluate the measurement error of the capacitive voltage transformer.

[0124] Among them, according to the influence degree, in the case of relatively low requirements for evaluation accuracy, the electric field factor and temperature factor with high influence degree are used as the target interference factors. In the case of relatively high requirements for evaluation accuracy, the electric field factor and temperature factor with high influence degree, and the humidity factor with medium influence degree are used as the target interference factors.

[0125] By considering the combined action of each target interference factor, the error sources corresponding to each target interference factor can be synthetically analyzed through the error propagation theory, and superimposed to calculate the total measurement error of the CVT.

[0126] It is also possible to evaluate the contribution of different factors to the measurement error through computer simulation or experimental tests in the actual environment, and combine the standard error analysis method to determine the main sources of error and the quantification results.

[0127] In this embodiment, it is possible to solve the problem that the measurement accuracy of the CVT in the high-voltage electric energy metering device is vulnerable to the interference of environmental factors. During operation, the CVT is affected by multiple factors such as temperature, electric field, and vibration. These factors will have a significant impact on the ratio error and phase angle error of the CVT, resulting in measurement errors, and further affecting the stable operation of the power system and the accuracy of electric energy trading.

[0128] The evaluation method for the influence of multiple interference sources on the error of a capacitive voltage transformer provided by the embodiment of the present application may be executed by an evaluation device for the influence of multiple interference sources on the error of a capacitive voltage transformer. In the embodiment of the present application, taking the evaluation device for the influence of multiple interference sources on the error of a capacitive voltage transformer executing the evaluation method for the influence of multiple interference sources on the error of a capacitive voltage transformer as an example, the evaluation device for the influence of multiple interference sources on the error of a capacitive voltage transformer provided by the embodiment of the present application is described.

[0129] The embodiment of the present application also provides an evaluation device for the influence of multiple interference sources on the error of a capacitive voltage transformer, which is applied to a capacitive voltage transformer. The equivalent circuit of the capacitive voltage transformer includes a capacitive voltage division module and an electromagnetic module;

[0130] The capacitive voltage division module includes a high-voltage capacitor C 1 and a low-voltage capacitor C 2 , and the electromagnetic module includes a compensating reactor L, a transformer T, and a damper D;

[0131] One end of the high-voltage capacitor C 1 is connected to the voltage terminal U 1 , and the other end of the high-voltage capacitor C 1 is grounded through the low-voltage capacitor C 2 ;

[0132] The other end of the high-voltage capacitor C 1 is connected to the first terminal a of the primary winding of the transformer T through the compensating reactor L, and the second terminal b of the primary winding is grounded;

[0133] The secondary winding of the transformer T is connected to the damper D.

[0134] As Figure 8 shown, the evaluation device for the influence of multiple interference sources on the error of a capacitive voltage transformer includes:

[0135] A first processing module 810, configured to construct a Pearson correlation analysis model for the capacitive voltage transformer based on multiple interference factors;

[0136] A second processing module 820, configured to analyze the error influence factor of each of the interference factors based on the Pearson correlation analysis model, and determine the influence degree of each of the interference factors on the capacitive voltage transformer.

[0137] A third processing module 830, configured to evaluate the measurement error of the capacitive voltage transformer through the coupling action of multiple interference sources based on the influence degree, where the multiple interference sources include two or more of the interference factors.

[0138] According to the evaluation device for the influence of multiple interference sources on the error of a capacitive voltage transformer provided by an embodiment of the present application, by quantifying the influence degree and interaction of multiple interference factors in the environment on the CVT measurement error through Pearson correlation analysis, it can accurately and reliably dynamically evaluate and quantify the change trend of the CVT measurement error, determine different interference factors and their correlations, clarify the main influencing factors, evaluate the generation mechanism and influence of the CVT measurement error in a theoretical manner, provide a theoretical basis for the error monitoring, accuracy evaluation and error control of the CVT in a high-voltage electric energy metering device, and further optimize the accuracy and reliability of electric energy metering.

[0139] The evaluation device for the influence of multiple interference sources on the error of a capacitive voltage transformer in an embodiment of the present application may be an electronic device or a component in an electronic device, such as an integrated circuit or a chip. The electronic device may be a terminal or other devices other than a terminal. Exemplarily, the electronic device may be a mobile phone, a tablet computer, a notebook computer, a handheld computer, a vehicle-mounted electronic device, a Mobile Internet Device (MID), an Augmented Reality (AR) / Virtual Reality (VR) device, a robot, a wearable device, an Ultra-Mobile Personal Computer (UMPC), a netbook, or a Personal Digital Assistant (PDA), etc., and may also be a server, a Network Attached Storage (NAS), a Personal Computer (PC), a Television (TV), a teller machine, or a self-service machine, etc. The embodiments of the present application do not make specific limitations.

[0140] The evaluation device for the influence of multiple interference sources on the error of a capacitive voltage transformer in an embodiment of the present application may be a device with an operating system. The operating system may be an Android operating system, an iOS operating system, or other possible operating systems. The embodiments of the present application do not make specific limitations.

[0141] The evaluation device for the influence of multiple interference sources on the error of capacitive voltage transformers provided by the embodiments of the present application can implement each process realized by the evaluation method embodiments of the influence of multiple interference sources on the error of capacitive voltage transformers in the above embodiments. To avoid repetition, it will not be elaborated here.

[0142] In some embodiments, as Figure 9 shown, the embodiments of the present application also provide an electronic device 900, including a processor 901, a memory 902, and a computer program stored on the memory 902 and executable on the processor 901. When the program is executed by the processor 901, it implements each process of the above-mentioned evaluation method embodiments of the influence of multiple interference sources on the error of capacitive voltage transformers and can achieve the same technical effects. To avoid repetition, it will not be elaborated here.

[0143] It should be noted that the electronic devices in the embodiments of the present application include the above-mentioned mobile electronic devices and non-mobile electronic devices.

[0144] The embodiments of the present application also provide a non-transitory computer-readable storage medium, on which a computer program is stored. When the computer program is executed by a processor, it implements each process of the above-mentioned evaluation method embodiments of the influence of multiple interference sources on the error of capacitive voltage transformers and can achieve the same technical effects. To avoid repetition, it will not be elaborated here.

[0145] Among them, the processor is the processor in the electronic device in the above embodiments. The readable storage medium includes computer-readable storage media, such as computer read-only memory (ROM), random access memory (RAM), magnetic disks, or optical discs, etc.

[0146] The embodiments of the present application also provide a computer program product, including a computer program, which implements the above-mentioned evaluation method of the influence of multiple interference sources on the error of capacitive voltage transformers when executed by a processor.

[0147] Among them, the processor is the processor in the electronic device in the above embodiments. The readable storage medium includes computer-readable storage media, such as computer read-only memory ROM, random access memory RAM, magnetic disks, or optical discs, etc.

[0148] The embodiments of the present application further provide a chip, which includes a processor and a communication interface. The communication interface is coupled to the processor, and the processor is used to run programs or instructions to implement each process of the above-mentioned evaluation method embodiments of the influence of multiple interference sources on the error of capacitive voltage transformers and can achieve the same technical effects. To avoid repetition, it will not be elaborated here.

[0149] It should be understood that the chip mentioned in the embodiments of the present application may also be referred to as a system-on-chip, system chip, chip system, or system-on-chip, etc.

[0150] It should be noted that in this text, the term "including", "comprising" or any other variant thereof is intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements not only includes those elements, but also includes other elements not expressly listed, or also includes elements inherent to such process, method, article or device. Without further limitation, an element defined by the statement "including a..." does not exclude the existence of another identical element in the process, method, article or device including that element. In addition, it should be pointed out that the scope of the methods and devices in the embodiments of the present application is not limited to performing functions in the order shown or discussed, and may also include performing functions in a substantially simultaneous manner or in a reverse order according to the functions involved. For example, the described methods may be performed in a different order than described, and various steps may be added, omitted, or combined. Additionally, the features described with reference to certain examples may be combined in other examples.

[0151] Through the description of the above embodiments, those skilled in the art can clearly understand that the above-described example methods can be implemented by means of software plus a necessary general hardware platform. Of course, they can also be implemented by hardware, but in many cases the former is a better implementation. Based on such an understanding, the technical solution of the present application, in essence, or the part that contributes to the prior art, can be embodied in the form of a computer software product. This computer software product is stored in a storage medium (such as ROM / RAM, magnetic disk, optical disc) and includes several instructions to enable a terminal (which can be a mobile phone, computer, server, or network device, etc.) to execute the method for evaluating the influence of multiple interference sources on the error of a capacitive voltage transformer in various embodiments of the present application.

[0152] In the description of the present application, the "first feature", "second feature" may include one or more of such features.

[0153] In the description of the present application, the meaning of "a plurality" is two or more.

[0154] The embodiments of the present application have been described above in conjunction with the accompanying drawings. However, the present application is not limited to the above specific embodiments. The above specific embodiments are merely illustrative and not restrictive. Those of ordinary skill in the art, under the inspiration of the present application and without departing from the spirit and scope protected by the claims of the present application, can also make many forms, all of which fall within the protection scope of the present application.

[0155] In the description of this specification, the descriptions referring to terms such as "one embodiment", "some embodiments", "schematic embodiments", "examples", "specific examples", or "some examples", etc., mean that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of this application. In this specification, the schematic expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in a suitable manner in any one or more embodiments or examples.

[0156] Although the embodiments of this application have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of this application, and the scope of this application is defined by the claims and their equivalents.

Claims

1. A method for evaluating the influence of multiple interference sources on the error of a capacitive voltage transformer, characterized in that: Applied to a capacitive voltage transformer, the equivalent circuit of the capacitive voltage transformer comprises a capacitive voltage dividing module and an electromagnetic module; The capacitor voltage dividing module includes a high voltage capacitor C1 and a low voltage capacitor C2, and the electromagnetic module includes a compensating reactor L, a transformer T and a damper D; One end of the high voltage capacitor C1 is connected to the voltage terminal U1, and the other end of the high voltage capacitor C1 is grounded via the low voltage capacitor C2; The other end of the high-voltage capacitor C1 is connected to the first terminal a of the primary winding of the transformer T through the compensating reactor L, and the second terminal b of the primary winding is grounded; The secondary winding of the transformer T is connected to a damper D; The method comprises: Based on multiple interference factors, a Pearson correlation analysis model is constructed for capacitive voltage transformer; Based on the Pearson correlation analysis model, the error influencing factor of each interference factor is analyzed to determine the influence degree of each interference factor on the capacitive voltage transformer; Based on the influence degree, the measurement error of the capacitive voltage transformer is evaluated through the coupling effect of multiple interference sources, and the multiple interference sources include two or more interference factors.

2. The method for evaluating the influence of multiple interference sources on the error of a capacitive voltage transformer according to claim 1, characterized in that: Based on the Pearson correlation analysis model, the error influencing factor of each interference factor is analyzed to determine the influence degree of each interference factor on the capacitive voltage transformer, including: A correlation analysis is performed between the error influencing factor and the capacitor voltage transformer error using a Pearson correlation analysis model to obtain an influencing parameter in the capacitor voltage transformer error corresponding to each interference factor; According to the influencing parameters, the degree of influence of each interference factor on the said is determined.

3. The method for evaluating the influence of multiple interference sources on the error of a capacitive voltage transformer according to claim 2, characterized in that: The interference factors include system frequency factors, temperature factors, humidity factors and electric field factors of the capacitive voltage transformer; The error influencing factor of the system frequency factor is the system frequency, the error influencing factor of the temperature factor is the temperature, the error influencing factor of the humidity factor is the insulation state, and the error influencing factor of the electric field factor is the stray capacitance.

4. The method for evaluating the influence of multiple interference sources on the error of a capacitive voltage transformer according to claim 3, characterized in that: When the interference factors are system frequency factors, temperature factors and humidity factors, the influencing parameters are angle difference and ratio difference; When the interference factor is an electric field factor, the influencing parameter is a voltage division ratio.

5. The method for evaluating the influence of multiple interference sources on the error of a capacitive voltage transformer according to claim 2, characterized in that: Determining the degree of influence of each interference factor on the above according to the influence parameter includes: Determining, according to the influencing parameter, a correlation coefficient between the interference factor and the capacitor voltage transformer error; Based on the correlation coefficient, the influence degree is determined.

6. The method for evaluating the influence of multiple interference sources on the error of a capacitive voltage transformer according to claim 5, characterized in that: The correlation coefficient r is: Where n is the sample size, X i is the corresponding difference sample value under the influence of different factors, Y i is the corresponding angle difference sample value under the influence of different factors, are their sample means.

7. The method for evaluating the influence of multiple interference sources on the error of a capacitive voltage transformer according to claim 1, characterized in that: Based on the above influence, the measurement error of the capacitive voltage transformer is evaluated through the coupling of multiple interference sources, including: Based on the impact degree, the multiple interference factors are screened to determine a target interference factor; The target interference factor is superimposed and coupled, and the measurement error of the capacitive voltage transformer is evaluated.

8. An evaluation device for the influence of multiple interference sources on the error of a capacitive voltage transformer, characterized in that: Applied to a capacitive voltage transformer, the equivalent circuit of the capacitive voltage transformer comprises a capacitive voltage dividing module and an electromagnetic module; The capacitor voltage dividing module includes a high voltage capacitor C1 and a low voltage capacitor C2, and the electromagnetic module includes a compensating reactor L, a transformer T and a damper D; One end of the high voltage capacitor C1 is connected to the voltage terminal U1, and the other end of the high voltage capacitor C1 is grounded via the low voltage capacitor C2; The other end of the high-voltage capacitor C1 is connected to the first terminal a of the primary winding of the transformer T through the compensating reactor L, and the second terminal b of the primary winding is grounded; The secondary winding of the transformer T is connected to a damper D; The device comprises: A first processing module is used to construct a Pearson correlation analysis model for the capacitive voltage transformer based on multiple interference factors; A second processing module is used to analyze the error influencing factor of each interference factor based on the Pearson correlation analysis model to determine the influence degree of each interference factor on the capacitive voltage transformer; The third processing module is used to evaluate the measurement error of the capacitive voltage transformer based on the influence degree through the coupling effect of multiple interference sources, and the multiple interference sources include two or more interference factors.

9. An electronic device comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, characterized in that: When the processor executes the computer program, the method for evaluating the influence of multiple interference sources on the error of a capacitive voltage transformer as described in any one of claims 1 to 7 is implemented.

10. A non-transitory computer-readable storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by a processor, the method for evaluating the influence of multiple interference sources on the error of a capacitive voltage transformer as described in any one of claims 1 to 7 is implemented.

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