A high-efficiency performance testing method for new energy vehicle charging piles

Abstract

The present application relates to the technical field of electric vehicle charging pile performance testing, and specifically to a high-efficiency performance testing method for a new energy vehicle charging pile, the method comprising: a charging pile power data collection step, obtaining the voltage signal and current signal, input power and output power of the input port A phase, B phase and C phase of the target charging pile during the vehicle charging pile test; a charging pile electrical performance analysis step, obtaining the power factor angle and phase difference instability coefficient by analyzing the similarity of the data distribution characteristics in the voltage signal and the current signal; a charging pile performance testing step, correcting the power factor angle according to the phase difference instability coefficient, and calculating the power conversion efficiency of the target charging pile according to the corrected power factor angle combined with the input power and output power of the target charging pile. The present application can improve the detection accuracy of the power conversion efficiency, thereby improving the performance detection accuracy of the charging pile.

Description

Technical Field

[0001] The present application relates to the technical field of electric vehicle charging pile performance testing, and in particular to a method for efficiently testing the performance of a new energy vehicle charging pile. Background Art

[0002] New energy vehicle charging piles are equipment that provide charging services for new energy vehicles. The development of new energy vehicle charging piles is crucial to promoting the popularization of electric vehicles. Testing the power conversion efficiency of new energy vehicle charging piles is part of the performance test of charging piles. The definition of power conversion efficiency usually refers to the ratio of the output power to the input power of the charging pile.

[0003] At present, the conversion efficiency is calculated by directly collecting the input and output power, ignoring the influence of the insulating materials in the car charging pile. The dielectric properties of the insulating materials and the inductance and capacitance components in the circuit of the charging pile will cause energy lag and additional energy loss during the transmission process of electric energy, thereby making the actual output power of the charging pile smaller. This small output power will lead to a decrease in the power transmission efficiency of the charging pile and affect the performance detection accuracy of the charging pile. Summary of the invention

[0004] In order to solve the above technical problems, the present application provides a new energy vehicle charging pile performance efficient testing method to solve the existing problems.

[0005] The present invention discloses a method for efficiently testing the performance of a new energy vehicle charging pile using the following technical solutions:

[0006] An embodiment of the present application provides a method for efficiently testing the performance of a new energy vehicle charging pile, the method comprising the following steps:

[0007] Charging pile power data collection steps: obtaining the voltage and current signals of the A phase, B phase, and C phase of the input port of the target charging pile during the vehicle charging pile test; collecting the input power and output power of the target charging pile;

[0008] The charging pile electrical performance analysis step is to remove the voltage signal and current signal of the input port A phase according to the similarity of the data distribution characteristics in the voltage signal and current signal of the input port A phase of the target charging pile; obtain the power factor angle of the input port A phase of the target charging pile according to the data synchronization change between the voltage signal and the current signal after the removal; obtain the phase difference instability coefficient of the input port A phase of the target charging pile according to the synchronization of the change trend between the voltage signal and the current signal;

[0009] The charging pile performance test steps are as follows: the power factor angle is corrected according to the phase difference instability coefficient of the input end A phase of the target charging pile to obtain the corrected power factor angle; accordingly, the corrected power factor angles of the input port B phase and C phase are obtained; the loss power of the target charging pile is obtained by combining the corrected power factor angles of the input end A phase, B phase, and C phase of the target charging pile and the input power of the target charging pile; the power conversion efficiency of the target charging pile is obtained by combining the loss power, input power, and output power of the target charging pile.

[0010] Furthermore, the process of performing a removal operation on the voltage signal and the current signal of the input port A phase includes:

[0011] According to the periodic variation characteristics of the data in the voltage signal of the phase A at the input end of the target charging pile, the peak-to-valley distribution sequence and the periodic variation amplitude of the voltage signal of the phase A at the input end are obtained;

[0012] For the current signal of phase A at the input terminal, the peak-valley distribution sequence and the periodic variation amplitude of the current signal are obtained by using the same acquisition method as the peak-valley distribution sequence and the periodic variation amplitude of the voltage signal of phase A at the input terminal;

[0013] If the first elements in the peak-valley distribution sequences of the voltage signal and the current signal are both peak data points or trough data points, the peak-valley distribution sequence of the voltage signal will not be eliminated; otherwise, the first data in the peak-valley distribution sequence of the voltage signal and the last data in the peak-valley distribution sequence of the current signal will be eliminated.

[0014] Furthermore, the method for acquiring the peak-to-valley distribution sequence and the periodic variation amplitude of the voltage signal of the input terminal A phase includes:

[0015] Acquire the peak data points and trough data points of the voltage signal of phase A at the input terminal of the target charging pile; arrange all the obtained peak data points and trough data points in chronological order to obtain a peak-valley distribution sequence; calculate the first-order difference sequence of the peak-valley distribution sequence; and use the mean of all the data in the first-order difference sequence as the periodic variation amplitude of the voltage signal of phase A at the input terminal.

[0016] Further, the power factor angle of the input phase A of the target charging pile is recorded as θA, and the expression of the power factor angle θA is: Wherein Δt represents the signal offset between the voltage signal and the current signal of phase A at the input end, and T represents the power cycle fluctuation amplitude of phase A at the input end of the target charging pile.

[0017] Furthermore, the power supply periodic fluctuation amplitude of the input terminal A phase of the target charging pile is: the average value of the periodic variation amplitudes of the voltage signal and the current signal.

[0018] Furthermore, the process of acquiring the signal offset between the voltage signal and the current signal includes:

[0019] The sequence consisting of the difference between the corresponding data of the peak-to-valley distribution sequence of the voltage signal and the current signal after elimination is recorded as the instantaneous signal offset sequence; the mean of the absolute values ​​of all data in the instantaneous signal offset sequence is recorded as the signal offset between the voltage signal and the current signal.

[0020] Further, the method for obtaining the phase difference instability coefficient of the input terminal A phase of the target charging pile includes:

[0021] A time series decomposition algorithm is used to obtain a trend term sequence and a residual term sequence of an instantaneous signal offset sequence; a straight line fitting is performed on all data in the trend term sequence to obtain the slope of the fitted straight line; the standard deviation of all data in the residual term sequence is calculated; and the absolute value of the slope of the fitted straight line and the forward fusion result of the standard deviation are used as the phase difference instability coefficient of phase A at the input end of the target charging pile.

[0022] Further, the power factor angle is corrected according to the phase difference instability coefficient of phase A at the input end of the target charging pile to obtain the corrected power factor angle, including: recording the corrected power factor angle of phase A at the input end of the target charging pile as δA, and the expression of the corrected power factor angle δA is: δA=(sigmod(H)×α+1)×θA, wherein θA represents the power factor angle of phase A at the input end of the target charging pile; sigmod() is the sigmod normalization function; α represents the preset correction factor; H is the phase difference instability coefficient of phase A at the input end.

[0023] Further, the power loss of the target charging pile is obtained by combining the corrected power factor angles of the input terminals A phase, B phase, and C phase of the target charging pile and the input power of the target charging pile, including:

[0024] Calculate the average of the corrected power factor angles of phase A, phase B, and phase C of the input port of the target charging pile, and record it as the average power factor angle of the input end of the target charging pile; multiply the sine value of the average power factor angle by the input power of the target charging pile, and record it as the power loss of the target charging pile.

[0025] Furthermore, the power loss, input power and output power of the target charging pile are combined to obtain the electric energy conversion efficiency of the target charging pile, including: taking the sum of the output power and the power loss of the target charging pile as the actual output power of the target charging pile; and taking the ratio of the actual output power to the input power of the target charging pile as the electric energy conversion efficiency of the target charging pile.

[0026] This application has at least the following beneficial effects:

[0027] The present application constructs a corrected phase difference by analyzing the distribution of data in the voltage signal and current signal of the charging pile to construct an instantaneous signal offset sequence, takes into account the influence of signal distortion in the voltage signal and the current signal on the phase difference between the voltage signal and the current signal, and improves the accuracy of the phase difference between the voltage signal and the current signal; further, a phase difference instability coefficient is constructed by analyzing the distribution of data points in the instantaneous signal offset sequence, and a corrected power factor angle is constructed in combination with the power factor angle obtained by the corrected phase difference, which takes into account the dielectric properties of the insulating material in the circuit of the charging pile caused by the unstable change of the phase difference between the voltage and the current and the influence of the additional Joule heat loss generated by the inductor and capacitor elements, thereby improving the accuracy of the subsequent evaluation of the power loss generated by the charging pile during the charging process; finally, the actual output power of the charging pile is obtained according to the power loss obtained by the corrected power factor angle, and the power conversion efficiency is calculated according to the actual output power; the present application improves the accuracy of the detection results of the actual power conversion efficiency of the charging pile, thereby improving the performance detection accuracy of the charging pile. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the technical solutions and advantages in the embodiments of the present application or the prior art, the drawings required for use in the embodiments or the prior art descriptions are briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0029] Figure 1 A flowchart of a method for efficiently testing the performance of a new energy vehicle charging pile provided in this application;

[0030] Figure 2 This is a block diagram for obtaining the corrected power factor angle provided in this application. DETAILED DESCRIPTION

[0031] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. In the absence of conflict, the embodiments of the present application and the technical features in the embodiments can be combined with each other. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0032] Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs.

[0033] The specific scheme of the performance efficient testing method of a new energy vehicle charging pile provided by the present application is described in detail below with reference to the accompanying drawings.

[0034] An embodiment of the present application provides a method for efficiently testing the performance of a new energy vehicle charging pile. Specifically, the following method for efficiently testing the performance of a new energy vehicle charging pile is provided. Figure 1 , the method comprises the following steps:

[0035] S1, charging pile power data collection step, is used to obtain the voltage signal and current signal of the input port A phase, B phase, and C phase of the target charging pile during the automobile charging pile test; and collect the input power and output power of the target charging pile.

[0036] A specific implementation scenario of the embodiment of the present application is a performance test scenario of a new energy vehicle charging pile. Detecting the power conversion efficiency of the new energy vehicle charging pile is an important part of the performance test of the charging pile. The power conversion efficiency is an indicator to measure the effectiveness of the charging pile in converting input power into output power. It can better understand the actual performance of the charging pile and ensure the safety and efficient charging experience of new energy vehicle users. Therefore, it is necessary to perform high-precision detection of the power conversion efficiency.

[0037] Currently, the detection of power conversion efficiency requires calculation by collecting input and output power; however, this detection method ignores the influence of the dielectric properties of the insulating material in the car charging pile, resulting in energy lag and additional power loss during the transmission process, and the power transmission efficiency obtained by the detection is low; therefore, the high-precision detection of power conversion efficiency in this application needs to consider the degree of influence of the dielectric properties of the insulating material on the fluctuation of the voltage signal and the current signal.

[0038] In this embodiment, the target charging pile is first connected to the AC power grid, and an electric car is charged. The voltage and current signals of the A phase, B phase, and C phase of the input port of the target charging pile are collected using an oscilloscope, and the voltage and current signals are ensured to be collected synchronously, wherein the sampling frequency of the voltage and current signals is 100 Hz, and the sampling time is 5 minutes. The sampling frequency and sampling time can be set by the implementer. The obtained voltage and current signals are respectively smoothed to reduce the interference of noise in the signal. In this embodiment, Savitzky-Golay filtering is selected for smoothing, and finally the voltage and current signals of the input end A phase, the voltage and current signals of the input end B phase, and the voltage and current signals of the input end C phase of the target charging pile are respectively obtained.

[0039] At the same time, a power meter is used to collect the input power P1 and output power P2 of the target charging pile.

[0040] S2, the charging pile electrical performance analysis step, obtains the power factor angle and phase difference instability coefficient by analyzing the similarity of the data distribution characteristics in the voltage signal and the current signal.

[0041] By obtaining the power factor angle at the input end of the charging pile, the actual output power of the charging pile can be effectively evaluated, where the power factor angle is also called the phase angle, which refers to the phase difference between the voltage and the current. However, due to the influence of power grid fluctuations or harmonics in the power grid, the voltage signal and current signal collected at the input end of the target charging pile may be distorted, and signal distortion will cause the waveform of the signal to no longer be a standard sine wave, causing problems with the synchronization between the voltage signal and the current signal, thereby affecting the calculation of the phase difference between the voltage signal and the current signal. Therefore, this embodiment improves the accuracy of the calculation of the phase difference between the voltage signal and the current signal through the following steps.

[0042] S21, according to the similarity of data distribution in the voltage signal and the current signal of the input port A phase of the target charging pile, the voltage signal and the current signal of the input port A phase are eliminated.

[0043] Current and voltage are usually generated synchronously, and they share the same power supply frequency. However, grid fluctuations or the influence of harmonics in the grid may cause signal distortion in the voltage and current signals collected at the input end of the target charging pile. The periodic variation characteristics are obtained by collecting the numerical distribution of the voltage and current signal data in real time. The voltage and current signals are eliminated according to the synchronous changes of their periodic variation characteristics, so that the changes of the voltage and current signals are synchronized.

[0044] Specifically, the peak data points and trough data points of the voltage signal of phase A at the input end of the target charging pile are obtained; in this embodiment, the peak and trough second-order difference recognition algorithm is used to obtain all the peak data points and trough data points of the voltage signal A1. As other implementation methods, on the premise that the peak data points and trough data points of the voltage signal can be obtained, the implementer can choose other feasible algorithms such as Fourier transform method and first-order difference method. Among them, the peak and trough second-order difference recognition algorithm is a well-known technology, and the specific process will not be repeated.

[0045] Arrange all the obtained peak data points and trough data points in chronological order to obtain a peak-to-trough distribution sequence; the peak-to-trough distribution sequence is used to characterize the change in the relative position of the peak and trough in the voltage signal A1 over time, so as to reflect the change in the phase of the voltage signal A1 over time. Calculate the first-order difference sequence of the peak-to-trough distribution sequence; use the mean of all the data in the first-order difference sequence as the periodic change amplitude of the voltage signal of the input terminal A phase; the first-order difference processing is a well-known technology, and the specific process will not be repeated.

[0046] For the current signal of phase A at the input terminal, the peak-valley distribution sequence and periodic variation amplitude of the current signal are obtained using the same acquisition method as the peak-valley distribution sequence and periodic variation amplitude of the voltage signal of phase A at the input terminal.

[0047] Since in an AC power system, current and voltage are usually generated synchronously, they share the same power frequency, so that the periods of the voltage signal and the current signal of the same phase in the AC power are equal.

[0048] Therefore, the average value of the periodic variation amplitude of the voltage signal and the current signal of the input phase A of the target charging pile is recorded as the power supply periodic fluctuation amplitude of the input phase A, which is used to characterize the signal periodic variation amplitude of the voltage signal and the current signal of the input phase A.

[0049] If the first elements in the peak-valley distribution sequence of the voltage signal and the current signal are both peak data points or trough data points, the peak-valley distribution sequence of the voltage signal is not removed; otherwise, the first data in the peak-valley distribution sequence of the voltage signal and the last data in the peak-valley distribution sequence of the current signal are removed;

[0050] Specifically, this embodiment obtains the difference between the first two data in each peak-valley distribution sequence, which is recorded as the peak-valley judgment value of each peak-valley distribution sequence; if the signs of the peak-valley judgment values ​​of the peak-valley distribution sequence of the voltage signal of phase A at the input end and the current signal are different, the first data of the peak-valley distribution sequence of the voltage signal of phase A at the input end is discarded.

[0051] In this embodiment, an example is given of the criteria for determining whether the signs of the peak and valley judgment values ​​are the same: if the two peak and valley judgment values ​​are -1 and -3 respectively, they are considered to have the same signs; if the two peak and valley judgment values ​​are 1 and -3 respectively, they are considered to have different signs. It should be noted that in the peak and valley distribution sequence, the peak data points and the valley data points are arranged crosswise, so the peak and valley judgment value will not be 0.

[0052] The elimination process is to determine whether the first data point in the peak-valley distribution sequence of the voltage signal and the current signal is simultaneously a peak data point or a trough data point. If not, the first data point in the peak-valley distribution sequence of the voltage signal will be removed to ensure that the first data point in the peak-valley distribution sequence of the voltage signal and the current signal is simultaneously a peak data point or a trough data point.

[0053] S22, calculating the power factor angle according to the data synchronization change between the voltage signal and the current signal after the elimination.

[0054] After the above elimination operation, the arrangement order of the peak data points and the trough data points of the voltage signal and the current signal is the same, so the peak-valley distribution sequence of the voltage signal and the current signal has the characteristic of synchronous change. Since the power factor angle refers to the phase difference between the phase voltage and the phase current in the alternating current, according to the synchronous change of the peak-valley distribution sequence, the signal offset between the voltage signal and the current signal is first calculated, and then the power factor angle is obtained.

[0055] Specifically, the sequence consisting of the difference between the corresponding data of the peak-to-valley distribution sequence of the voltage signal and the current signal after elimination is recorded as the instantaneous signal offset sequence; the mean of the absolute values ​​of all data in the instantaneous signal offset sequence is recorded as the signal offset between the voltage signal and the current signal.

[0056] The instantaneous signal offset sequence is used to characterize the distribution of the phase difference between the peaks or troughs in the voltage signal and the current signal at adjacent sampling moments over time, that is, the synchronous change. The obtained signal offset characterizes the phase difference between the voltage signal and the current signal.

[0057] When the phase difference between voltage and current caused by the inductor and capacitor components changes continuously when the AC current passes through, additional Joule heat loss will be generated, making the power factor angle unstable. Therefore, the power factor angle can be calculated based on the phase difference between the voltage signal and the current signal represented by the signal offset obtained above.

[0058] Specifically, the power factor angle θA of phase A at the input end of the target charging pile is calculated as follows: Where Δt represents the signal offset between the voltage signal and the current signal of the input phase A of the target charging pile, and T represents the power cycle fluctuation amplitude of the input phase A of the target charging pile. The value range of the obtained power factor angle θA is [0°, 90°].

[0059] The greater the phase difference between voltage and current caused by inductor and capacitor elements when alternating current passes through, the greater the power factor angle obtained, and the more additional Joule heat loss is generated when the phase difference between current and voltage changes.

[0060] S23, obtaining a phase difference instability coefficient of phase A at the input end of the target charging pile according to the synchronization of the change trends between the voltage signal and the current signal.

[0061] The instantaneous signal offset sequence is used to characterize the temporal distribution of the phase difference between the peaks or troughs in the voltage signal and the current signal at adjacent sampling moments. The phase difference instability coefficient can be obtained according to the trend and fluctuation of the instantaneous signal offset sequence, which characterizes the steepness of the overall trend of the data changing over time.

[0062] Based on the above analysis, the time series decomposition algorithm is used to obtain the trend term sequence and residual term sequence of the instantaneous signal offset sequence;

[0063] The trend term sequence and the residual term sequence are used to characterize the long-term change trend and short-term fluctuation distribution of the data in the instantaneous signal offset sequence. In this embodiment, the STL decomposition algorithm is used to decompose the instantaneous signal offset sequence. As other implementation methods, the implementer can adopt other feasible time series decomposition algorithms, among which the STL decomposition algorithm is a well-known technology, and the specific process will not be repeated here.

[0064] Fit all the data in the trend item sequence with a straight line to obtain the slope of the fitted straight line; calculate the standard deviation of all the data in the residual item sequence; and use the absolute value of the slope of the fitted straight line and the forward fusion result of the standard deviation as the phase difference instability coefficient of the input end A phase of the target charging pile.

[0065] It should be noted that forward fusion means that the fused data and the fused result have a same-direction changing relationship, where the larger the fused data, the larger the fused result. Forward fusion can specifically be a multiplication relationship, an addition relationship, etc., which is determined by the actual application and this application does not impose any special restrictions.

[0066] As an embodiment of the present application, the phase difference instability coefficient of the input terminal A phase of the target charging pile is the sum of the absolute value of the slope of the fitting straight line and the standard deviation.

[0067] As another embodiment of the present application, the phase difference instability coefficient of the input terminal A phase of the target charging pile may be the product of the absolute value of the slope of the fitting straight line and the standard deviation.

[0068] Among them, the slope of the fitting straight line of the trend term sequence is used to characterize the overall trend of the data points in the instantaneous signal offset sequence changing over time, wherein linear fitting is a well-known technology and the specific process will not be repeated. The standard deviation of the data points in the residual term sequence is used to characterize the overall short-term fluctuation of the data points in the instantaneous signal offset sequence. The larger the phase difference instability coefficient obtained by forward fusion of the absolute value of the slope and the standard deviation, the steeper the overall trend of the data in the instantaneous signal offset sequence changing over time, and the larger the absolute value of the slope, the greater the overall short-term fluctuation of the data points in the instantaneous signal offset sequence, the more unstable the data points changing over time, and the more unstable the phase difference between the voltage signal and the current signal changing over time.

[0069] S3, charging pile performance test step, corrects the power factor angle according to the phase difference instability coefficient, and calculates the power conversion efficiency of the target charging pile based on the corrected power factor angle combined with the input power and output power of the target charging pile.

[0070] The phase difference instability coefficient characterizes the signal distortion of the voltage signal and current signal at the input end. In order to obtain the actual output power of the target charging pile and improve the accuracy of the charging pile performance test, such as Figure 2 As shown, the power factor angle needs to be corrected according to the phase difference instability coefficient to obtain the corrected power factor angle; and then the actual output power of the target charging pile is calculated in combination with the input power and output power of the target charging pile.

[0071] First, calculate the corrected power factor angle δA of phase A at the input end of the target charging pile: δA = (sigmod(H) × α + 1) × θA, where H represents the phase difference instability coefficient of phase A at the input end of the target charging pile; θA represents the power factor angle of phase A at the input end of the target charging pile; H is the phase difference instability coefficient of phase A at the input end; sigmod() is the sigmod normalization function, which is used to map the value of the phase difference instability coefficient H to the interval of 0-1; α represents the preset correction factor. In order to control the correction range of the power factor angle θA, the value of α can be set by the technician according to the resistance of the inductor and capacitor elements in the charging pile. In this application, the empirical value of α is 0.1; the constant 1 is added because when the value of the phase difference instability coefficient H is 0, the inductor and capacitor elements in the charging pile circuit will not generate additional Joule heat loss, and there is no need to correct the result of the power factor angle θA.

[0072] The more unstable the phase difference between the voltage signal and the current signal is over time, the larger the value of the phase difference instability coefficient H is, the more additional Joule heat loss is generated by the inductor and capacitor elements in the charging pile circuit, the lower the utilization rate of the electric energy at the input end of the charging pile, the larger the value of the power factor angle θA should be, and the larger the corrected power factor angle δA should be.

[0073] Using the same calculation method as the corrected power factor angle δA, the voltage signals and current signals of the B-phase and C-phase of the input port of the target charging pile are respectively used to calculate the corrected power factor angle of the input phase B and the corrected power factor angle of the input phase C of the target charging pile.

[0074] Calculate the average of the corrected power factor angles of phases A, B, and C of the target charging pile's input port, and record it as the average power factor angle of the target charging pile's input terminal; multiply the sine value of the average power factor angle by the target charging pile's input power, and record it as the target charging pile's power loss. This is used to characterize the power consumed by the dielectric properties of the insulating material and the inductance and capacitance components in the charging pile's circuit during the charging process of the target charging pile.

[0075] The sum of the output power and the loss power of the target charging pile is taken as the actual output power of the target charging pile, and the ratio of the actual output power to the input power of the target charging pile is taken as the power conversion efficiency of the target charging pile, thereby completing an efficient performance testing method for a new energy vehicle charging pile.

[0076] Through the above description of the implementation method in combination with the accompanying drawings, technical personnel in the relevant field can understand that for the convenience and simplicity of description, only the division of the above-mentioned functional modules is used as an example. In actual applications, the above-mentioned functions can be assigned to different functional modules as needed, that is, the internal structure of the device can be divided into different functional modules to complete all or part of the functions described above.

[0077] The above contents are only specific implementation methods of the present application, but the protection scope of the present application is not limited thereto. Any technician familiar with the technical field can easily think of changes or substitutions within the technical scope disclosed in the present application, which should be included in the protection scope of the present application. Therefore, the protection scope of the present application should be based on the protection scope of the claims.

Claims

1. A high-efficiency performance testing method for a new energy vehicle charging pile, characterized in that: The method comprises the following steps: Charging pile power data collection steps: obtaining the voltage and current signals of the A phase, B phase, and C phase of the input port of the target charging pile during the vehicle charging pile test; collecting the input power and output power of the target charging pile; The charging pile electrical performance analysis step is to remove the voltage signal and current signal of the input port A phase according to the similarity of the data distribution characteristics in the voltage signal and current signal of the input port A phase of the target charging pile; obtain the power factor angle of the input port A phase of the target charging pile according to the data synchronization change between the voltage signal and the current signal after the removal; obtain the phase difference instability coefficient of the input port A phase of the target charging pile according to the synchronization of the change trend between the voltage signal and the current signal; Charging pile performance test steps, according to the phase difference instability coefficient of the input end A phase of the target charging pile, the power factor angle is corrected to obtain the corrected power factor angle; accordingly, the corrected power factor angles of the input port B phase and C phase are obtained; the loss power of the target charging pile is obtained by combining the corrected power factor angles of the input end A phase, B phase, and C phase of the target charging pile and the input power of the target charging pile; the power loss, input power, and output power of the target charging pile are combined to obtain the electric energy conversion efficiency of the target charging pile; The process of removing the voltage signal and the current signal of the input port A phase includes: According to the periodic variation characteristics of the data in the voltage signal of the phase A at the input end of the target charging pile, the peak-to-valley distribution sequence and the periodic variation amplitude of the voltage signal of the phase A at the input end are obtained; For the current signal of phase A at the input terminal, the peak-valley distribution sequence and the periodic variation amplitude of the current signal are obtained by using the same acquisition method as the peak-valley distribution sequence and the periodic variation amplitude of the voltage signal of phase A at the input terminal; If the first elements in the peak-valley distribution sequence of the voltage signal and the current signal are both peak data points or trough data points, the peak-valley distribution sequence of the voltage signal is not removed; otherwise, the first data in the peak-valley distribution sequence of the voltage signal and the last data in the peak-valley distribution sequence of the current signal are removed; The method for acquiring the peak-to-valley distribution sequence and the periodic variation amplitude of the voltage signal of the input terminal A phase comprises: Acquire the peak data points and trough data points of the voltage signal of the input terminal A phase of the target charging pile; arrange all the obtained peak data points and trough data points in chronological order to obtain a peak-valley distribution sequence; calculate the first-order difference sequence of the peak-valley distribution sequence; take the mean of all the data in the first-order difference sequence as the periodic variation amplitude of the voltage signal of the input terminal A phase; record the power factor angle of the input terminal A phase of the target charging pile as θA, and the expression of the power factor angle θA is: Where Δt represents the signal offset between the voltage signal and the current signal of phase A at the input end, and T represents the power cycle fluctuation amplitude of phase A at the input end of the target charging pile; The method for obtaining the phase difference instability coefficient of the input end A phase of the target charging pile includes: The trend term sequence and residual term sequence of the instantaneous signal offset sequence are obtained by using a time series decomposition algorithm; a straight line is fitted to all data in the trend term sequence to obtain the slope of the fitted straight line; the standard deviation of all data in the residual term sequence is calculated; the absolute value of the slope of the fitted straight line and the forward fusion result of the standard deviation are used as the phase difference instability coefficient of the input end A phase of the target charging pile; The power factor angle is corrected according to the phase difference instability coefficient of phase A at the input end of the target charging pile to obtain the corrected power factor angle, including: the corrected power factor angle of phase A at the input end of the target charging pile is recorded as δA, and the expression of the corrected power factor angle δA is: δA=(sigmod(H)×α+1)×θA, wherein θA represents the power factor angle of phase A at the input end of the target charging pile; sigmod() is the sigmod normalization function; α represents the preset correction factor; H is the phase difference instability coefficient of phase A at the input end.

2. A high-efficiency performance testing method for a new energy vehicle charging pile as claimed in claim 1, characterized in that: The power supply periodic fluctuation amplitude of phase A at the input end of the target charging pile is: the average value of the periodic variation amplitude of the voltage signal and the current signal.

3. A high-efficiency performance testing method for a new energy vehicle charging pile as claimed in claim 1, characterized in that: The process of obtaining the signal offset between the voltage signal and the current signal includes: The sequence consisting of the difference between the corresponding data of the peak-to-valley distribution sequence of the voltage signal and the current signal after elimination is recorded as the instantaneous signal offset sequence; the mean of the absolute values ​​of all data in the instantaneous signal offset sequence is recorded as the signal offset between the voltage signal and the current signal.

4. A high-efficiency performance testing method for a new energy vehicle charging pile as claimed in claim 1, characterized in that: The method combines the corrected power factor angles of the input terminals A phase, B phase, and C phase of the target charging pile and the input power of the target charging pile to obtain the power loss of the target charging pile, including: Calculate the average of the corrected power factor angles of phase A, phase B, and phase C of the input port of the target charging pile, and record it as the average power factor angle of the input end of the target charging pile; multiply the sine value of the average power factor angle by the input power of the target charging pile, and record it as the power loss of the target charging pile.

5. A high-efficiency performance testing method for a new energy vehicle charging pile as claimed in claim 1, characterized in that: The power loss, input power and output power of the target charging pile are combined to obtain the electric energy conversion efficiency of the target charging pile, including: taking the sum of the output power and the power loss of the target charging pile as the actual output power of the target charging pile; and taking the ratio of the actual output power to the input power of the target charging pile as the electric energy conversion efficiency of the target charging pile.

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