Electric vehicle public charging pile group metering quality performance evaluation method and device

Abstract

The invention relates to the technical field of charging pile state evaluation, and particularly provides an electric vehicle public charging pile group metering quality performance evaluation method and device. Comprising the steps of determining a metering quality performance evaluation result of each charging pile group based on a weight coefficient of each metering quality performance evaluation index and an index value of each charging pile group corresponding to each metering quality performance evaluation index; obtaining a weight coefficient optimization value of each metering quality performance evaluation index by adopting a particle swarm optimization algorithm; and determining a final metering quality performance evaluation result of each charging pile group based on the weight coefficient optimization value of each metering quality performance evaluation index and the index value of each charging pile group corresponding to each metering quality performance evaluation index. According to the technical scheme provided by the invention, the metering quality performance of the charging pile group is evaluated comprehensively and objectively, the charging piles with poor performance can be identified and improved, and the overall service quality is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of charging pile status assessment, and in particular to a method and device for evaluating the metering quality performance of a public charging pile group for electric vehicles. Background Art

[0002] At present, the standard GB / T28569-2012 "Electric Vehicle AC Charging Pile Electric Energy Measurement" stipulates the technical requirements for electric vehicle AC charging pile electric energy measurement, and clarifies the configuration and installation requirements, test methods and inspection rules of electric energy metering devices. The implementation of this standard provides guidance for the measurement quality and performance evaluation of electric vehicle public charging pile groups.

[0003] However, despite the clear specifications and standards for AC charging piles for electric vehicles, some problems are still faced in the actual evaluation process. First, measurement errors and instabilities still exist, affecting the accuracy of the evaluation. For example, factors such as the generation of harmonics, the instability of the power grid, and the high current during charging may affect the measurement results. Secondly, the inconsistency of measurement standards is also an urgent problem to be solved. Charging piles of different brands and models may have differences in measurement, resulting in a lack of comparability in the evaluation results. Summary of the invention

[0004] In order to overcome the above-mentioned defects, the present invention proposes a method and device for evaluating the metering quality performance of a public charging pile group for electric vehicles.

[0005] In a first aspect, a method for evaluating the measurement quality and performance of a public charging pile group for electric vehicles is provided, wherein the method comprises:

[0006] The entropy weight method is used to obtain the weight coefficient of each metrological quality performance evaluation index;

[0007] Determine the measurement quality performance evaluation result of each charging pile group based on the weight coefficient of each measurement quality performance evaluation index and the index value of each charging pile group corresponding to each measurement quality performance evaluation index;

[0008] The weight coefficient of each metering quality performance evaluation index is used as the initial particle of the particle swarm optimization algorithm, the metering quality performance evaluation result of each charging pile group is used as the fitness value, and the particle swarm optimization algorithm is used to obtain the optimized value of the weight coefficient of each metering quality performance evaluation index;

[0009] The final measurement quality performance evaluation result of each charging pile group is determined based on the optimized value of the weight coefficient of each measurement quality performance evaluation index and the index value of each charging pile group corresponding to each measurement quality performance evaluation index.

[0010] Preferably, the measurement quality performance evaluation index includes at least one of the following: an electric energy measurement accuracy index, a charging efficiency index, a safety performance index and a charging frequency index.

[0011] Preferably, before determining the measurement quality performance evaluation result of each charging pile group based on the weight coefficient of each measurement quality performance evaluation index and the index value of each charging pile group corresponding to each measurement quality performance evaluation index, the method includes:

[0012] The positive indicators in each metrological quality performance evaluation index are standardized according to the following formula:

[0013]

[0014] The negative indicators in each metrological quality performance evaluation index are standardized according to the following formula:

[0015]

[0016] In the above formula, r ij is the standard value corresponding to the index value of the jth measurement quality performance evaluation index of the i-th charging pile group, x ij is the index value of the jth measurement quality performance evaluation index of the i-th charging pile group, max x j is the maximum value of the jth metrological quality performance evaluation index, min x j is the minimum value of the j-th metrology quality performance evaluation index.

[0017] Preferably, the weight coefficients of the measurement quality performance evaluation indicators are as follows:

[0018]

[0019] In the above formula, w j is the weight coefficient of the jth metrological quality performance evaluation index, E j is the entropy value of the jth metrology quality performance evaluation index, and m is the total number of metrology quality performance evaluation indicators.

[0020] Furthermore, the entropy value of the j-th metrology quality performance evaluation index is as follows:

[0021]

[0022] In the above formula, n is the total number of charging piles, p ij is the characteristic weight of the i-th charging pile group under the j-th measurement quality performance evaluation index, wherein the characteristic weight of the i-th charging pile group under the j-th measurement quality performance evaluation index is as follows:

[0023]

[0024] In the above formula, x ij is the index value of the j-th measurement quality performance evaluation index of the i-th charging pile group.

[0025] Preferably, the method of determining the measurement quality performance evaluation result of each charging pile group based on the weight coefficient of each measurement quality performance evaluation index and the index value of each charging pile group corresponding to each measurement quality performance evaluation index includes:

[0026] Determine positive and negative ideal solutions based on the weight coefficients of the measurement quality performance evaluation indicators and the index values ​​of the measurement quality performance evaluation indicators corresponding to the charging pile groups;

[0027] The measurement quality performance evaluation results of each charging pile group are determined based on the positive and negative ideal solutions.

[0028] Furthermore, the positive and negative ideal solutions are as follows:

[0029] B + =(max x ij |j∈J1),(max x ij |j∈J2), |i=1, 2,…,n

[0030] B - =(max x ij |j∈J1),(max x ij |j∈J2), |i=1, 2,…,n

[0031] In the above formula, B + is a positive ideal solution, B - is a negative ideal solution, x ij is the index value of the jth measurement quality performance evaluation index of the i-th charging pile group, J1 is the benefit index, J2 is the cost index, and n is the total number of charging pile groups.

[0032] Furthermore, the measurement quality performance evaluation results of each charging pile group are as follows:

[0033]

[0034] In the above formula, F i is the measurement quality performance evaluation result of the i-th charging pile group, is the negative score of the i-th charging pile group, is the positive score of the i-th charging pile group, wherein the negative score of the i-th charging pile group is as follows:

[0035]

[0036] The positive score of the i-th charging pile group is as follows:

[0037]

[0038] In the above formula, B ij is the standard value of the index value of the jth measurement quality performance evaluation index of the i-th charging pile group, m is the total number of measurement quality performance evaluation indicators, is the negative ideal solution of the jth metrological quality performance evaluation index, is the positive ideal solution of the jth metrological quality performance evaluation index.

[0039] Furthermore, the electric energy measurement accuracy index E is as follows:

[0040] E=(M-T1) / M×100%

[0041] The charging efficiency index E_efficiency is as follows:

[0042] E_efficiency=Ea÷Ep×100%

[0043] The security performance indicator E_secure is as follows:

[0044] E_secure=b1Y+b2L+b3W

[0045] The charging frequency indicator E_frequency is as follows:

[0046] E_frequency=E_time÷T2

[0047] In the above formula, M is the power displayed on the charging pile, T1 is the actual charged power, Ea is the actual power charged into the vehicle battery, Ep is the power absorbed from the power grid, b1, b2 and b3 are the first, second and third coefficients respectively, Y is the overvoltage protection coefficient, L is the overcurrent protection coefficient, W is the overtemperature protection coefficient, E_times is the number of charging times in a unit time period, and T2 is the time length of a unit time period.

[0048] Furthermore, the overvoltage protection coefficient = (maximum output voltage of the charging pile - rated output voltage) / rated output voltage × 100%; the overcurrent protection coefficient = (maximum output current of the charging pile - rated output current) / rated output current × 100%; the overtemperature protection coefficient = (maximum temperature of the charging pile - rated operating temperature) / rated operating temperature × 100%.

[0049] In a second aspect, a device for evaluating the measurement quality and performance of a public charging pile group for electric vehicles is provided, wherein the device for evaluating the measurement quality and performance of a public charging pile group for electric vehicles comprises:

[0050] An acquisition module is used to obtain the weight coefficient of each metrological quality performance evaluation index by adopting the entropy weight method;

[0051] A determination module, used to determine the measurement quality performance evaluation result of each charging pile group based on the weight coefficient of each measurement quality performance evaluation index and the index value of each charging pile group corresponding to each measurement quality performance evaluation index;

[0052] An optimization module, used to use the weight coefficient of each metering quality performance evaluation index as the initial particle of the particle swarm optimization algorithm, the metering quality performance evaluation result of each charging pile group as the fitness value, and use the particle swarm optimization algorithm to obtain the optimized value of the weight coefficient of each metering quality performance evaluation index;

[0053] The evaluation module is used to determine the final measurement quality performance evaluation results of each charging pile group based on the weight coefficient optimization value of each measurement quality performance evaluation index and the index value of each charging pile group corresponding to each measurement quality performance evaluation index.

[0054] Preferably, the measurement quality performance evaluation index includes at least one of the following: an electric energy measurement accuracy index, a charging efficiency index, a safety performance index and a charging frequency index.

[0055] Preferably, the device comprises: a standardization module, specifically used for:

[0056] The positive indicators in each metrological quality performance evaluation index are standardized according to the following formula:

[0057]

[0058] The negative indicators in each metrological quality performance evaluation index are standardized according to the following formula:

[0059]

[0060] In the above formula, r ij is the standard value corresponding to the index value of the jth measurement quality performance evaluation index of the i-th charging pile group, x ij is the index value of the jth measurement quality performance evaluation index of the i-th charging pile group, max x j is the maximum value of the jth metrological quality performance evaluation index, min x j is the minimum value of the j-th metrology quality performance evaluation index.

[0061] Preferably, the weight coefficients of the measurement quality performance evaluation indicators are as follows:

[0062]

[0063] In the above formula, w j is the weight coefficient of the jth metrological quality performance evaluation index, E jis the entropy value of the jth metrology quality performance evaluation index, and m is the total number of metrology quality performance evaluation indicators.

[0064] Furthermore, the entropy value of the j-th metrology quality performance evaluation index is as follows:

[0065]

[0066] In the above formula, n is the total number of charging piles, p ij is the characteristic weight of the i-th charging pile group under the j-th measurement quality performance evaluation index, wherein the characteristic weight of the i-th charging pile group under the j-th measurement quality performance evaluation index is as follows:

[0067]

[0068] In the above formula, x ij is the index value of the j-th measurement quality performance evaluation index of the i-th charging pile group.

[0069] Preferably, the determining module is specifically used for:

[0070] Determine positive and negative ideal solutions based on the weight coefficients of the measurement quality performance evaluation indicators and the index values ​​of the measurement quality performance evaluation indicators corresponding to the charging pile groups;

[0071] The measurement quality performance evaluation results of each charging pile group are determined based on the positive and negative ideal solutions.

[0072] Furthermore, the positive and negative ideal solutions are as follows:

[0073] B + =(max x ij |j∈J1),(max x ij |j∈J2), |i=1, 2,…,n

[0074] B-=(max x ij |j∈J1),(max x ij |j∈J2), |i=1, 2,…,n

[0075] In the above formula, B + is a positive ideal solution, B - is a negative ideal solution, x ij is the index value of the jth measurement quality performance evaluation index of the i-th charging pile group, J1 is the benefit index, J2 is the cost index, and n is the total number of charging pile groups.

[0076] Furthermore, the measurement quality performance evaluation results of each charging pile group are as follows:

[0077]

[0078] In the above formula, F i is the measurement quality performance evaluation result of the i-th charging pile group, is the negative score of the i-th charging pile group, is the positive score of the i-th charging pile group, wherein the negative score of the i-th charging pile group is as follows:

[0079]

[0080] The positive score of the i-th charging pile group is as follows:

[0081]

[0082] In the above formula, B ij is the standard value of the index value of the jth measurement quality performance evaluation index of the i-th charging pile group, m is the total number of measurement quality performance evaluation indicators, is the negative ideal solution of the jth metrological quality performance evaluation index, is the positive ideal solution of the jth metrological quality performance evaluation index.

[0083] Furthermore, the electric energy measurement accuracy index E is as follows:

[0084] E=(M-T1) / M×100%

[0085] The charging efficiency index E_efficiency is as follows:

[0086] E_efficiency=Ea÷Ep×100%

[0087] The security performance indicator E_secure is as follows:

[0088] E_secure=b1Y+b2L+b3W

[0089] The charging frequency indicator E_frequency is as follows:

[0090] E_frequency=E_time÷T2

[0091] In the above formula, M is the power displayed on the charging pile, T1 is the actual charged power, Ea is the actual power charged into the vehicle battery, Ep is the power absorbed from the power grid, b1, b2 and b3 are the first, second and third coefficients respectively, Y is the overvoltage protection coefficient, L is the overcurrent protection coefficient, W is the overtemperature protection coefficient, E_times is the number of charging times in a unit time period, and T2 is the time length of a unit time period.

[0092] Furthermore, the overvoltage protection coefficient = (maximum output voltage of the charging pile - rated output voltage) / rated output voltage × 100%; the overcurrent protection coefficient = (maximum output current of the charging pile - rated output current) / rated output current × 100%; the overtemperature protection coefficient = (maximum temperature of the charging pile - rated operating temperature) / rated operating temperature × 100%.

[0093] In a third aspect, a computer device is provided, comprising: one or more processors;

[0094] The processor is used to store one or more programs;

[0095] When the one or more programs are executed by the one or more processors, the method for evaluating the metering quality performance of a group of public charging piles for electric vehicles is implemented.

[0096] In a fourth aspect, a computer-readable storage medium is provided, on which a computer program is stored. When the computer program is executed, the method for evaluating the metering quality performance of a group of public charging piles for electric vehicles is implemented.

[0097] The above one or more technical solutions of the present invention have at least one or more of the following beneficial effects:

[0098] The present invention provides a method and device for evaluating the metering quality performance of a public charging pile group for electric vehicles, comprising: using an entropy weight method to obtain a weight coefficient of each metering quality performance evaluation indicator; determining the metering quality performance evaluation result of each charging pile group based on the weight coefficient of each metering quality performance evaluation indicator and the index value of each charging pile group corresponding to each metering quality performance evaluation indicator; using the weight coefficient of each metering quality performance evaluation indicator as the initial particle of a particle swarm optimization algorithm, and the metering quality performance evaluation result of each charging pile group as a fitness value, and using the particle swarm optimization algorithm to obtain the optimized value of the weight coefficient of each metering quality performance evaluation indicator; determining the final metering quality performance evaluation result of each charging pile group based on the optimized value of the weight coefficient of each metering quality performance evaluation indicator and the index value of each charging pile group corresponding to each metering quality performance evaluation indicator. The technical solution provided by the present invention can comprehensively consider the weight and importance of each evaluation indicator, avoid the subjective determination of the indicator weight in the traditional method, thereby improving the credibility of the evaluation results, and further objectively measure the discreteness of the indicator data, avoid the deviation of the evaluation results caused by data fluctuations or outliers, ensure the objectivity of the evaluation, help identify and improve charging piles with poor performance, and improve the overall service quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0099] Figure 1 It is a flow chart of the main steps of the method for evaluating the quality performance of public charging pile groups for electric vehicles according to an embodiment of the present invention. DETAILED DESCRIPTION

[0100] The specific implementation modes of the present invention will be further described in detail below in conjunction with the accompanying drawings.

[0101] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0102] As disclosed in the background technology, at present, the standard GB / T28569-2012 "Electric Vehicle AC Charging Pile Electric Energy Measurement" stipulates the technical requirements for electric vehicle AC charging pile electric energy measurement, and clarifies the configuration and installation requirements, test methods and inspection rules of electric energy metering devices. The implementation of this standard provides guidance for the measurement quality performance evaluation of electric vehicle public charging pile groups.

[0103] However, despite the clear specifications and standards for AC charging piles for electric vehicles, some problems are still faced in the actual evaluation process. First, measurement errors and instabilities still exist, affecting the accuracy of the evaluation. For example, factors such as the generation of harmonics, the instability of the power grid, and the high current during charging may affect the measurement results. Secondly, the inconsistency of measurement standards is also an urgent problem to be solved. Charging piles of different brands and models may have differences in measurement, resulting in a lack of comparability in the evaluation results.

[0104] In order to improve the above-mentioned problems, the present invention provides a method and device for evaluating the metering quality performance of a public charging pile group for electric vehicles, comprising: using an entropy weight method to obtain a weight coefficient of each metering quality performance evaluation indicator; determining the metering quality performance evaluation result of each charging pile group based on the weight coefficient of each metering quality performance evaluation indicator and the index value of each charging pile group corresponding to each metering quality performance evaluation indicator; using the weight coefficient of each metering quality performance evaluation indicator as the initial particle of a particle swarm optimization algorithm, and the metering quality performance evaluation result of each charging pile group as the fitness value, and using a particle swarm optimization algorithm to obtain the optimized value of the weight coefficient of each metering quality performance evaluation indicator; determining the final metering quality performance evaluation result of each charging pile group based on the optimized value of the weight coefficient of each metering quality performance evaluation indicator and the index value of each metering quality performance evaluation indicator corresponding to each charging pile group. The technical solution provided by the present invention can comprehensively consider the weight and importance of each evaluation indicator, avoid the subjective determination of the indicator weight in the traditional method, thereby improving the credibility of the evaluation results, and further objectively measure the discreteness of the indicator data, avoid the deviation of the evaluation results caused by data fluctuations or outliers, ensure the objectivity of the evaluation, help identify and improve charging piles with poor performance, and improve the overall service quality.

[0105] The above scheme is described in detail below.

[0106] Example 1

[0107] See attached Figure 1 , Figure 1 1 is a flow chart of the main steps of a method for evaluating the quality performance of a public charging pile group for electric vehicles according to an embodiment of the present invention. Figure 1 As shown, the electric vehicle public charging pile group measurement quality performance evaluation method in the embodiment of the present invention mainly includes the following steps:

[0108] Step S101: using the entropy weight method to obtain the weight coefficient of each measurement quality performance evaluation index;

[0109] Step S102: determining the measurement quality performance evaluation result of each charging pile group based on the weight coefficient of each measurement quality performance evaluation index and the index value of each charging pile group corresponding to each measurement quality performance evaluation index;

[0110] Step S103: using the weight coefficient of each metering quality performance evaluation index as the initial particle of the particle swarm optimization algorithm, and the metering quality performance evaluation result of each charging pile group as the fitness value, and using the particle swarm optimization algorithm to obtain the optimized value of the weight coefficient of each metering quality performance evaluation index;

[0111] Step S104: determining the final measurement quality performance evaluation result of each charging pile group based on the optimized value of the weight coefficient of each measurement quality performance evaluation index and the index value of each charging pile group corresponding to each measurement quality performance evaluation index.

[0112] Among them, the measurement quality performance evaluation index includes at least one of the following: electric energy measurement accuracy index, charging efficiency index, safety performance index and charging frequency index.

[0113] In this embodiment, in the process of evaluating the metrology quality performance of public charging pile groups for electric vehicles, since the indicators have different dimensions and units, direct comparison or calculation will lead to distorted results. Therefore, data normalization is performed, and the data corresponding to each evaluation indicator is dimensionless. Ensure that the data of each charging pile group on different indicators are converted to the same scale to facilitate subsequent calculations and analysis. Therefore, before determining the metrology quality performance evaluation results of each charging pile group based on the weight coefficients of the metrology quality performance evaluation indicators and the indicator values ​​of each charging pile group corresponding to each metrology quality performance evaluation indicator, it includes:

[0114] The positive indicators in each metrological quality performance evaluation index are standardized according to the following formula:

[0115]

[0116] The negative indicators in each metrological quality performance evaluation index are standardized according to the following formula:

[0117]

[0118] In the above formula, r ij is the standard value corresponding to the index value of the jth measurement quality performance evaluation index of the i-th charging pile group, x ij is the index value of the jth measurement quality performance evaluation index of the i-th charging pile group, max x j is the maximum value of the jth metrological quality performance evaluation index, min x j is the minimum value of the j-th metrology quality performance evaluation index.

[0119] The standardized data is shifted by 0.0001 units as a whole to eliminate the influence of indicators with values ​​equal to zero on subsequent calculation results.

[0120] In this embodiment, the weight coefficients of the measurement quality performance evaluation indicators are as follows:

[0121]

[0122] In the above formula, w j is the weight coefficient of the jth metrological quality performance evaluation index, Ej is the entropy value of the jth metrology quality performance evaluation index, and m is the total number of metrology quality performance evaluation indicators.

[0123] In one embodiment, the entropy value of the j-th metrology quality performance evaluation index is as follows:

[0124]

[0125] In the above formula, n is the total number of charging piles, p ij is the characteristic weight of the i-th charging pile group under the j-th measurement quality performance evaluation index, wherein the characteristic weight of the i-th charging pile group under the j-th measurement quality performance evaluation index is as follows:

[0126]

[0127] In the above formula, x ij is the index value of the j-th measurement quality performance evaluation index of the i-th charging pile group.

[0128] In this embodiment, the method of determining the measurement quality performance evaluation result of each charging pile group based on the weight coefficient of each measurement quality performance evaluation index and the index value of each charging pile group corresponding to each measurement quality performance evaluation index includes:

[0129] Determine positive and negative ideal solutions based on the weight coefficients of the measurement quality performance evaluation indicators and the index values ​​of the measurement quality performance evaluation indicators corresponding to the charging pile groups;

[0130] The measurement quality performance evaluation results of each charging pile group are determined based on the positive and negative ideal solutions.

[0131] In one embodiment, the positive and negative ideal solutions are as follows:

[0132] B + =(max x ij |j∈J1),(max x ij |j∈J2), |i=1, 2,…,n

[0133] B - =(max x ij |j∈J1),(max x ij |j∈J2), |i=1, 2,…,n

[0134] In the above formula, B + is a positive ideal solution, B - is a negative ideal solution, x ij is the index value of the jth measurement quality performance evaluation index of the i-th charging pile group, J1 is the benefit index, J2 is the cost index, and n is the total number of charging pile groups.

[0135] In one embodiment, the measurement quality performance evaluation results of each charging pile group are as follows:

[0136]

[0137] In the above formula, F i is the measurement quality performance evaluation result of the i-th charging pile group, is the negative score of the i-th charging pile group, is the positive score of the i-th charging pile group, wherein the negative score of the i-th charging pile group is as follows:

[0138]

[0139] The positive score of the i-th charging pile group is as follows:

[0140]

[0141] In the above formula, B ij is the standard value of the index value of the jth measurement quality performance evaluation index of the i-th charging pile group, m is the total number of measurement quality performance evaluation indicators, is the negative ideal solution of the jth metrological quality performance evaluation index, is the positive ideal solution of the jth metrological quality performance evaluation index.

[0142] In one embodiment, the power metering accuracy index reflects the accuracy of the power metering of the charging pile, that is, the degree of deviation between the power actually charged into the electric vehicle during the charging process and the power displayed by the charging pile. The power metering accuracy index E is as follows:

[0143] E=(M-T1) / M×100%

[0144] The charging efficiency index reflects the proportion of power lost during the charging process to the total charging power, that is, the ratio between the power absorbed from the power grid and the power actually charged into the vehicle battery. The charging efficiency index E_efficiency is as follows:

[0145] E_efficiency=Ea÷Ep×100%

[0146] The safety performance index reflects whether the charging pile has overvoltage, overcurrent, or overtemperature during the charging process. The safety performance index E_secure is as follows:

[0147] E_secure=b1Y+b2L+b3W

[0148] The charging frequency index reflects the average utilization rate of the charging pile, that is, the number of charging times completed per unit time. The charging frequency index E_frequency is as follows:

[0149] E_frequency=E_time÷T2

[0150] In the above formula, M is the power displayed on the charging pile, T1 is the actual charged power, Ea is the actual power charged into the vehicle battery, Ep is the power absorbed from the power grid, b1, b2 and b3 are the first, second and third coefficients respectively, Y is the overvoltage protection coefficient, L is the overcurrent protection coefficient, W is the overtemperature protection coefficient, E_times is the number of charging times in a unit time period, and T2 is the time length of a unit time period.

[0151] In one embodiment, the overvoltage protection coefficient = (charging pile maximum output voltage - rated output voltage) / rated output voltage × 100%; the overcurrent protection coefficient = (charging pile maximum output current - rated output current) / rated output current × 100%; the overtemperature protection coefficient = (charging pile maximum temperature - rated operating temperature) / rated operating temperature × 100%.

[0152] In a specific implementation, the measurement quality performance evaluation of the charging pile group is divided into different categories, and the specific classification is as follows:

[0153] Excellent: Charging pile groups with a comprehensive score higher than or equal to the high score threshold (0.8).

[0154] Good: Charging pile groups whose comprehensive scores are between the high score threshold (0.8) and the medium score threshold (0.6).

[0155] Medium: Charging pile groups with comprehensive scores between the medium score threshold (0.6) and the low score threshold (0.4).

[0156] Poor: Charging pile groups whose comprehensive scores are lower than the low score threshold (0.4).

[0157] Example 2

[0158] Based on the same inventive concept, the present invention also provides a device for evaluating the measurement quality and performance of a public charging pile group for electric vehicles, the device comprising:

[0159] An acquisition module is used to obtain the weight coefficient of each metrological quality performance evaluation index by adopting the entropy weight method;

[0160] A determination module, used to determine the measurement quality performance evaluation result of each charging pile group based on the weight coefficient of each measurement quality performance evaluation index and the index value of each charging pile group corresponding to each measurement quality performance evaluation index;

[0161] An optimization module, used to use the weight coefficient of each metering quality performance evaluation index as the initial particle of the particle swarm optimization algorithm, the metering quality performance evaluation result of each charging pile group as the fitness value, and use the particle swarm optimization algorithm to obtain the optimized value of the weight coefficient of each metering quality performance evaluation index;

[0162] The evaluation module is used to determine the final measurement quality performance evaluation results of each charging pile group based on the weight coefficient optimization value of each measurement quality performance evaluation index and the index value of each charging pile group corresponding to each measurement quality performance evaluation index.

[0163] Preferably, the measurement quality performance evaluation index includes at least one of the following: an electric energy measurement accuracy index, a charging efficiency index, a safety performance index and a charging frequency index.

[0164] Preferably, the device comprises: a standardization module, specifically used for:

[0165] The positive indicators in each metrological quality performance evaluation index are standardized according to the following formula:

[0166]

[0167] The negative indicators in each metrological quality performance evaluation index are standardized according to the following formula:

[0168]

[0169] In the above formula, r ij is the standard value corresponding to the index value of the jth measurement quality performance evaluation index of the i-th charging pile group, x ij is the index value of the jth measurement quality performance evaluation index of the i-th charging pile group, max x j is the maximum value of the jth metrological quality performance evaluation index, min x j is the minimum value of the j-th metrology quality performance evaluation index.

[0170] Preferably, the weight coefficients of the measurement quality performance evaluation indicators are as follows:

[0171]

[0172] In the above formula, w j is the weight coefficient of the jth metrological quality performance evaluation index, E j is the entropy value of the jth metrology quality performance evaluation index, and m is the total number of metrology quality performance evaluation indicators.

[0173] Furthermore, the entropy value of the j-th metrology quality performance evaluation index is as follows:

[0174]

[0175] In the above formula, n is the total number of charging piles, p ij is the characteristic weight of the i-th charging pile group under the j-th measurement quality performance evaluation index, wherein the characteristic weight of the i-th charging pile group under the j-th measurement quality performance evaluation index is as follows:

[0176]

[0177] In the above formula, x ij is the index value of the j-th measurement quality performance evaluation index of the i-th charging pile group.

[0178] Preferably, the determining module is specifically used for:

[0179] Determine positive and negative ideal solutions based on the weight coefficients of the measurement quality performance evaluation indicators and the index values ​​of the measurement quality performance evaluation indicators corresponding to the charging pile groups;

[0180] The measurement quality performance evaluation results of each charging pile group are determined based on the positive and negative ideal solutions.

[0181] Furthermore, the positive and negative ideal solutions are as follows:

[0182] B + =(max x ij |j∈J1),(max x ij |j∈J2), |i=1, 2,…,n

[0183] B - =(max x ij |j∈J1),(max x ij |j∈J2), |i=1, 2,…,n

[0184] In the above formula, B + is a positive ideal solution, B- is a negative ideal solution, x ij is the index value of the jth measurement quality performance evaluation index of the i-th charging pile group, J1 is the benefit index, J2 is the cost index, and n is the total number of charging pile groups.

[0185] Furthermore, the measurement quality performance evaluation results of each charging pile group are as follows:

[0186]

[0187] In the above formula, F i is the measurement quality performance evaluation result of the i-th charging pile group, is the negative score of the i-th charging pile group, is the positive score of the i-th charging pile group, wherein the negative score of the i-th charging pile group is as follows:

[0188]

[0189] The positive score of the i-th charging pile group is as follows:

[0190]

[0191] In the above formula, B ij is the standard value of the index value of the jth measurement quality performance evaluation index of the i-th charging pile group, m is the total number of measurement quality performance evaluation indicators, is the negative ideal solution of the jth metrological quality performance evaluation index, is the positive ideal solution of the jth metrological quality performance evaluation index.

[0192] Furthermore, the electric energy measurement accuracy index E is as follows:

[0193] E=(M-T1) / M×100%

[0194] The charging efficiency index E_efficiency is as follows:

[0195] E_efficiency=Ea÷Ep×100%

[0196] The security performance indicator E_secure is as follows:

[0197] E_secure=b1Y+b2L+b3W

[0198] The charging frequency indicator E_frequency is as follows:

[0199] E_frequency=E_time÷T2

[0200] In the above formula, M is the power displayed on the charging pile, T1 is the actual charged power, Ea is the actual power charged into the vehicle battery, Ep is the power absorbed from the power grid, b1, b2 and b3 are the first, second and third coefficients respectively, Y is the overvoltage protection coefficient, L is the overcurrent protection coefficient, W is the overtemperature protection coefficient, E_times is the number of charging times in a unit time period, and T2 is the time length of a unit time period.

[0201] Furthermore, the overvoltage protection coefficient = (maximum output voltage of the charging pile - rated output voltage) / rated output voltage × 100%; the overcurrent protection coefficient = (maximum output current of the charging pile - rated output current) / rated output current × 100%; the overtemperature protection coefficient = (maximum temperature of the charging pile - rated operating temperature) / rated operating temperature × 100%.

[0202] Example 3

[0203] Based on the same inventive concept, the present invention also provides a computer device, which includes a processor and a memory, the memory is used to store a computer program, the computer program includes program instructions, and the processor is used to execute the program instructions stored in the computer storage medium. The processor may be a central processing unit (CPU), or other general-purpose processors, digital signal processors (DSP), application-specific integrated circuits (ASIC), field-programmable gate arrays (FPGA) or other programmable logic devices, discrete gates or transistor logic devices, discrete hardware components, etc. It is the computing core and control core of the terminal, which is suitable for implementing one or more instructions, and is specifically suitable for loading and executing one or more instructions in the computer storage medium to implement the corresponding method flow or corresponding function, so as to implement the steps of the electric vehicle public charging pile group measurement quality performance evaluation method in the above embodiment.

[0204] Example 4

[0205] Based on the same inventive concept, the present invention also provides a storage medium, specifically a computer-readable storage medium (Memory), which is a memory device in a computer device for storing programs and data. It can be understood that the computer-readable storage medium here can include both built-in storage media in a computer device and, of course, extended storage media supported by the computer device. The computer-readable storage medium provides a storage space, which stores the operating system of the terminal. In addition, one or more instructions suitable for being loaded and executed by a processor are also stored in the storage space, and these instructions can be one or more computer programs (including program codes). It should be noted that the computer-readable storage medium here can be a high-speed RAM memory or a non-volatile memory, such as at least one disk memory. The processor can load and execute one or more instructions stored in the computer-readable storage medium to implement the steps of a method for evaluating the quality performance of a public charging pile group for electric vehicles in the above embodiment.

[0206] Those skilled in the art will appreciate that embodiments of the present invention may be provided as methods, systems, or computer program products. Therefore, the present invention may take the form of a complete hardware embodiment, a complete software embodiment, or an embodiment combining software and hardware. Moreover, the present invention may take the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0207] The present invention is described with reference to flowcharts and / or block diagrams of methods, devices (systems), and computer program products according to embodiments of the present invention. It should be understood that each process and / or block in the flowchart and / or block diagram, as well as the combination of processes and / or blocks in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing device to produce a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the processes in the flowchart and / or block diagram. Figure 1 A process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0208] These computer program instructions may also be stored in a computer readable memory capable of directing a computer or other programmable data processing device to operate in a specific manner, so that the instructions stored in the computer readable memory produce an article of manufacture including an instruction device, which implements the process Figure 1 A process or multiple processes and / or boxes Figure 1 A function specified in one or more boxes.

[0209] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operating steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing instructions for implementing the process. Figure 1 A process or multiple processes and / or boxes Figure 1 The steps for the functions specified in one or more boxes.

[0210] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the above embodiments, ordinary technicians in the relevant field should understand that the specific implementation methods of the present invention can still be modified or replaced by equivalents. Any modification or equivalent replacement that does not depart from the spirit and scope of the present invention should be covered within the scope of protection of the claims of the present invention.

Claims

1. A method for evaluating the measurement quality performance of public charging piles for electric vehicles, characterized in that: The method comprises: The entropy weight method is used to obtain the weight coefficient of each metrological quality performance evaluation index; Determine the measurement quality performance evaluation result of each charging pile group based on the weight coefficient of each measurement quality performance evaluation index and the index value of each charging pile group corresponding to each measurement quality performance evaluation index; The weight coefficient of each metering quality performance evaluation index is used as the initial particle of the particle swarm optimization algorithm, the metering quality performance evaluation result of each charging pile group is used as the fitness value, and the particle swarm optimization algorithm is used to obtain the optimized value of the weight coefficient of each metering quality performance evaluation index; The final measurement quality performance evaluation result of each charging pile group is determined based on the optimized value of the weight coefficient of each measurement quality performance evaluation index and the index value of each charging pile group corresponding to each measurement quality performance evaluation index.

2. The method according to claim 1, characterized in that The measurement quality performance evaluation index includes at least one of the following: an electric energy measurement accuracy index, a charging efficiency index, a safety performance index, and a charging frequency index.

3. The method according to claim 1, characterized in that Before determining the measurement quality performance evaluation result of each charging pile group based on the weight coefficient of each measurement quality performance evaluation index and the index value of each charging pile group corresponding to each measurement quality performance evaluation index, the method includes: The positive indicators in each metrological quality performance evaluation index are standardized according to the following formula: The negative indicators in each metrological quality performance evaluation index are standardized according to the following formula: In the above formula, r ij is the standard value corresponding to the index value of the jth measurement quality performance evaluation index of the i-th charging pile group, x ij is the index value of the jth measurement quality performance evaluation index of the i-th charging pile group, max x j is the maximum value of the jth metrological quality performance evaluation index, min x j is the minimum value of the j-th metrology quality performance evaluation index.

4. The method according to claim 1, characterized in that The weight coefficients of the above-mentioned measurement quality performance evaluation indicators are as follows: In the above formula, w j is the weight coefficient of the jth metrological quality performance evaluation index, E j is the entropy value of the jth metrology quality performance evaluation index, and m is the total number of metrology quality performance evaluation indicators.

5. The method according to claim 4, characterized in that The entropy value of the j-th metrology quality performance evaluation index is as follows: In the above formula, n is the total number of charging piles, p ij is the characteristic weight of the i-th charging pile group under the j-th measurement quality performance evaluation index, wherein the characteristic weight of the i-th charging pile group under the j-th measurement quality performance evaluation index is as follows: In the above formula, x ij is the index value of the j-th measurement quality performance evaluation index of the i-th charging pile group.

6. The method according to claim 1, characterized in that The method of determining the measurement quality performance evaluation result of each charging pile group based on the weight coefficient of each measurement quality performance evaluation index and the index value of each charging pile group corresponding to each measurement quality performance evaluation index includes: Determine positive and negative ideal solutions based on the weight coefficients of the measurement quality performance evaluation indicators and the index values ​​of the measurement quality performance evaluation indicators corresponding to the charging pile groups; The measurement quality performance evaluation results of each charging pile group are determined based on the positive and negative ideal solutions.

7. The method according to claim 6, characterized in that The positive and negative ideal solutions are as follows: B + =(max x ij |j∈J1),(max x ij |j∈J2),|i=1,2,…,n B - =(max x ij |j∈J1),(max x ij |j∈J2),|i=1,2,…,n In the above formula, B + is a positive ideal solution, B - is a negative ideal solution, x ij is the index value of the jth measurement quality performance evaluation index of the i-th charging pile group, J1 is the benefit index, J2 is the cost index, and n is the total number of charging pile groups.

8. The method according to claim 7, characterized in that The measurement quality performance evaluation results of each charging pile group are as follows: In the above formula, F i is the measurement quality performance evaluation result of the i-th charging pile group, is the negative score of the i-th charging pile group, is the positive score of the i-th charging pile group, wherein the negative score of the i-th charging pile group is as follows: The positive score of the i-th charging pile group is as follows: In the above formula, B ij is the standard value of the index value of the jth measurement quality performance evaluation index of the i-th charging pile group, m is the total number of measurement quality performance evaluation indicators, is the negative ideal solution of the jth metrological quality performance evaluation index, is the positive ideal solution of the jth metrological quality performance evaluation index.

9. The method according to claim 2, characterized in that The electric energy measurement accuracy index E is as follows: E=(M-T1) / M×100% The charging efficiency index E_efficiency is as follows: E_efficiency=Ea÷Ep×100% The security performance indicator E_secure is as follows: E_secure=b1Y+b2L+b3W The charging frequency indicator E_frequency is as follows: E_frequency=E_time÷T2 In the above formula, M is the power displayed on the charging pile, T1 is the actual charged power, Ea is the actual power charged into the vehicle battery, Ep is the power absorbed from the power grid, b1, b2 and b3 are the first, second and third coefficients respectively, Y is the overvoltage protection coefficient, L is the overcurrent protection coefficient, W is the overtemperature protection coefficient, E_times is the number of charging times in a unit time period, and T2 is the time length of a unit time period.

10. The method according to claim 9, characterized in that The overvoltage protection coefficient = (maximum output voltage of the charging pile - rated output voltage) / rated output voltage × 100%; the overcurrent protection coefficient = (maximum output current of the charging pile - rated output current) / rated output current × 100%; the overtemperature protection coefficient = (maximum temperature of the charging pile - rated operating temperature) / rated operating temperature × 100%.

11. A device for evaluating the measurement quality and performance of a public charging pile group for electric vehicles, characterized in that: The device comprises: An acquisition module is used to obtain the weight coefficient of each metrological quality performance evaluation index by adopting the entropy weight method; A determination module, used to determine the measurement quality performance evaluation result of each charging pile group based on the weight coefficient of each measurement quality performance evaluation index and the index value of each charging pile group corresponding to each measurement quality performance evaluation index; An optimization module, used to use the weight coefficient of each metering quality performance evaluation index as the initial particle of the particle swarm optimization algorithm, the metering quality performance evaluation result of each charging pile group as the fitness value, and use the particle swarm optimization algorithm to obtain the optimized value of the weight coefficient of each metering quality performance evaluation index; The evaluation module is used to determine the final measurement quality performance evaluation results of each charging pile group based on the weight coefficient optimization value of each measurement quality performance evaluation index and the index value of each charging pile group corresponding to each measurement quality performance evaluation index.

12. The device according to claim 11, characterized in that The measurement quality performance evaluation index includes at least one of the following: an electric energy measurement accuracy index, a charging efficiency index, a safety performance index, and a charging frequency index.

13. The device according to claim 11, characterized in that The device comprises: a standardization module, specifically used for: The positive indicators in each metrological quality performance evaluation index are standardized according to the following formula: The negative indicators in each metrological quality performance evaluation index are standardized according to the following formula: In the above formula, r ij is the standard value corresponding to the index value of the jth measurement quality performance evaluation index of the i-th charging pile group, x ij is the index value of the jth measurement quality performance evaluation index of the i-th charging pile group, max x j is the maximum value of the jth metrological quality performance evaluation index, min x j is the minimum value of the j-th metrology quality performance evaluation index.

14. The device according to claim 11, characterized in that The weight coefficients of the above-mentioned measurement quality performance evaluation indicators are as follows: In the above formula, w j is the weight coefficient of the jth metrological quality performance evaluation index, E j is the entropy value of the jth metrology quality performance evaluation index, and m is the total number of metrology quality performance evaluation indicators.

15. The device according to claim 14, characterized in that The entropy value of the j-th metrology quality performance evaluation index is as follows: In the above formula, n is the total number of charging piles, p ij is the characteristic weight of the i-th charging pile group under the j-th measurement quality performance evaluation index, wherein the characteristic weight of the i-th charging pile group under the j-th measurement quality performance evaluation index is as follows: In the above formula, x ij is the index value of the j-th measurement quality performance evaluation index of the i-th charging pile group.

16. The device according to claim 11, characterized in that The determination module is specifically used for: Determine positive and negative ideal solutions based on the weight coefficients of the measurement quality performance evaluation indicators and the index values ​​of the measurement quality performance evaluation indicators corresponding to the charging pile groups; The measurement quality performance evaluation results of each charging pile group are determined based on the positive and negative ideal solutions.

17. The device according to claim 16, characterized in that The positive and negative ideal solutions are as follows: B + =(max x ij |j∈J1),(max x ij |j∈J2),|i=1,2,…,n B - =(max x ij |j∈J1),(max x ij |j∈J2),|i=1,2,…,n In the above formula, B + is a positive ideal solution, B - is a negative ideal solution, x ij is the index value of the jth measurement quality performance evaluation index of the i-th charging pile group, J1 is the benefit index, J2 is the cost index, and n is the total number of charging pile groups.

18. The device according to claim 17, characterized in that The measurement quality performance evaluation results of each charging pile group are as follows: In the above formula, F i is the measurement quality performance evaluation result of the i-th charging pile group, is the negative score of the i-th charging pile group, is the positive score of the i-th charging pile group, wherein the negative score of the i-th charging pile group is as follows: The positive score of the i-th charging pile group is as follows: In the above formula, B ij is the standard value of the index value of the jth measurement quality performance evaluation index of the i-th charging pile group, m is the total number of measurement quality performance evaluation indicators, is the negative ideal solution of the jth metrological quality performance evaluation index, is the positive ideal solution of the jth metrological quality performance evaluation index.

19. The device according to claim 12, characterized in that The electric energy measurement accuracy index E is as follows: E=(M-T1) / M×100% The charging efficiency index E_efficiency is as follows: E_efficiency=Ea÷Ep×100% The security performance indicator E_secure is as follows: E_secure=b1Y+b2L+b3W The charging frequency indicator E_frequency is as follows: E_frequency=E_time÷T2 In the above formula, M is the power displayed on the charging pile, T1 is the actual charged power, Ea is the actual power charged into the vehicle battery, Ep is the power absorbed from the power grid, b1, b2 and b3 are the first, second and third coefficients respectively, Y is the overvoltage protection coefficient, L is the overcurrent protection coefficient, W is the overtemperature protection coefficient, E_times is the number of charging times in a unit time period, and T2 is the time length of a unit time period.

20. The device according to claim 19, characterized in that The overvoltage protection coefficient = (maximum output voltage of the charging pile - rated output voltage) / rated output voltage × 100%; the overcurrent protection coefficient = (maximum output current of the charging pile - rated output current) / rated output current × 100%; the overtemperature protection coefficient = (maximum temperature of the charging pile - rated operating temperature) / rated operating temperature × 100%.

21. A computer device, characterized in that: include: one or more processors; The processor is configured to execute one or more programs; When the one or more programs are executed by the one or more processors, the method for evaluating the metering quality performance of a public charging pile group for electric vehicles as described in any one of claims 1 to 10 is implemented.

22. A computer-readable storage medium, characterized in that: A computer program is stored thereon, and when the computer program is executed, the method for evaluating the metering quality performance of a public charging pile group for electric vehicles as described in any one of claims 1 to 10 is implemented.

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