Charging pile group error characteristic control method and device, equipment and medium

Abstract

The invention provides a control method and device for error characteristics of a charging pile group, equipment and a medium, and relates to the technical field of charging pile verification. The control method comprises the following steps: S101, calculating a virtual verification standard value in a charging pile group metering guarantee scheme; s102, calculating process parameters of a virtual checking standard in the charging pile group metering guarantee scheme based on the virtual checking standard value; s103, controlling the error characteristics of the charging pile group according to the process parameters of the virtual verification standard; in the control process, if it is found that all pile errors of the charging pile group exceed the control limit, process parameters of the virtual checking standard in the charging pile group metering guarantee scheme are corrected. The method has the advantages that the error characteristic of the charging pile group is monitored, the error of each pile of the charging pile group is monitored, the effectiveness of the virtual verification standard is ensured, and the verification efficiency of the charging piles is greatly improved.

Description

Technical Field

[0001] The present invention relates to the technical field of metering control of charging facilities, and in particular to a method, device, equipment and medium for controlling the error characteristics of a charging pile group. Background Art

[0002] At present, the number of new energy electric vehicles is constantly increasing, and the operation and service of electric vehicle charging facilities are receiving increasing attention, which is mainly reflected in the measurement accuracy and charging safety of charging facilities. The accuracy of charging facility measurement directly determines the fairness and reliability of charging trade settlement, and ultimately determines whether the electric vehicle industry can develop healthily.

[0003] A metrological assurance program (MAP) is a quality assurance program for metrological processes. This program quantitatively determines the total measurement uncertainty (including random and systematic error components) of a metrological process relative to a national benchmark or other specified standard, and verifies that the total uncertainty meets user requirements. A metrological assurance program system is a management system that ensures the quality of metrological processes through a series of planned and systematic activities, ensuring that metrological results meet predetermined requirements. Its advantages include: Improve measurement quality: Through a closed-loop feedback mechanism, comprehensively assess the entire measurement process to ensure the accuracy and consistency of value transfer.

[0004] Reduce costs: Simplifying the application of metrology assurance solutions can reduce implementation costs while ensuring measurement quality.

[0005] Enhanced traceability: Establish a complete metrology chain to ensure that measurement results can be traced back to national or international standards.

[0006] However, existing charging pile calibration methods are divided into manual calibration and data-driven calibration methods. Manual calibration faces problems such as high cost, low efficiency, heavy workload, and staff shortages, making it unsuitable for the calibration of large numbers of charging piles. Data-driven calibration is an effective way to improve the efficiency of calibration for large numbers of charging piles. Current data-driven calibration methods include those based on energy conservation and those that interact with vehicle-pile data. However, these methods still rely on the traditional single-time calibration approach, using error calculation algorithms as virtual measuring instruments. This makes it difficult to continuously monitor the error trends of charging pile groups and effectively ensure that the error characteristics of charging piles are continuously controlled during daily use.

[0007] Therefore, how to monitor the error characteristics of charging pile groups, monitor the errors of each charging pile in the group, ensure the effectiveness of virtual verification standards, and ensure the fairness of billing has become a technical problem that needs to be solved urgently. Summary of the Invention

[0008] The technical problem to be solved by the present invention is to provide a method, device, equipment and medium for controlling the error characteristics of a charging pile group. Based on the metering assurance scheme system, the energy conservation is used to establish a virtual verification standard value by using the total meter power measurement data of the charging station and the power measurement data of each pile in the pile group in the station, and then calculate the process parameter verification standard value recognition value. A c and standard deviation recognized values S c , forming a virtual verification standard model, and calculating the statistic t c Control the error characteristics of the charging pile group to ensure the fairness of billing.

[0009] In a first aspect, the present invention provides a method for controlling the error characteristics of a charging pile group, comprising the following steps: S101. Calculate the virtual verification standard value in the charging pile group metering assurance plan; S102. Calculate the process parameters of the virtual verification standard in the charging pile group metering assurance solution based on the virtual verification standard value; S103. Control the error characteristics of the charging pile group according to the process parameters of the virtual verification standard. During the control process, if it is found that the errors of all piles in the charging pile group exceed the control limit, correct the process parameters of the virtual verification standard in the charging pile group measurement assurance plan.

[0010] Furthermore, the calculation method of the virtual verification standard value in the charging pile group metering assurance solution in step S101 is: ; Where, the subscript k represents the kth calculation, where k ≥ 2; A i is a matrix β No. i elements, representing the error coefficient of the solution of the i-th charging pile; the matrix β Refers to the error coefficient matrix of each charging pile in the charging pile group. β The calculation formula is: ; In the formula, the superscript T Represents matrix transpose; matrix E and E t They are: , ; Among them, the matrix E t Chinese elements E tx The total energy meter for the charging station is x Readings at each moment; ε 0 is the fixed loss in the charging station; 1 N×1is a matrix with N rows and 1 column and all 1s; E Chinese elements E xi For the charging station i Pile No. x Readings at each moment; η i For the i The AC-DC conversion efficiency of a pile, if it is an AC pile, then η i =1; a measurement contains N moments, x=1, 2, ...N; Each moment measures n Data of piles i=1, 2, …n ; Among them, the number of moments N> the number of charging piles n.

[0011] Furthermore, the process parameters of the virtual verification standard include verification standard value approval value A c and standard deviation recognized values S c ; The verification standard value approved value A c The calculation method is: ; Where M is the number of measurements, where 2≤M≤k; Standard deviation recognized value S c The calculation method is: ; Furthermore, the method for performing process control on the error characteristics of the charging pile group using the process parameters of the virtual verification standard in step S103 includes: (1) When each additional calculation is added after the kth calculation, it is recorded as the kth k+l Calculation, l ≥1; calculate the standard value of this virtual verification C k+l ;but: ; (2) Calculate the t statistic t c : ; (3) If and only if t c When ≤3, it is considered that the errors of all piles in the pile group do not exceed the control limit, that is, they meet the normal use requirements; otherwise, it is considered that the error of at least one pile in the pile group is out of tolerance, and manual verification and calibration are carried out.

[0012] The method for controlling the process parameters of the charging pile group virtual verification standard in step S103 includes: When t cWhen it is greater than 3, T charging piles in the charging pile group are manually verified or standard power modules are installed, and M measurements are performed on these T charging piles to obtain the error verification values d of the T charging piles yz , where y = 1, 2, …, T, 1 ≤ T < N; z = 1, 2, …, M, and calculate its mean value A c ’ and standard deviation S c ’: ; ; If the t statistic , and S c ’ ≤ S c , then the process parameters of the virtual verification standard are controlled and do not need to be corrected; otherwise, correct A c to be A c ’.

[0013] In a second aspect, the present invention provides a control device for the error characteristics of a charging pile group, including: A simulated verification standard value calculation module, configured to calculate the virtual verification standard value in the metering assurance plan of the charging pile group; A process parameter calculation module, configured to calculate the process parameters of the virtual verification standard in the metering assurance plan of the charging pile group based on the virtual verification standard value; An error characteristic control and correction module, configured to control the error characteristics of the charging pile group according to the process parameters of the virtual verification standard; during the control process, if it is found that the errors of all the charging piles in the charging pile group exceed the control limit, the process parameters of the virtual verification standard in the metering assurance plan of the charging pile group are corrected.

[0014] Furthermore, the calculation method of the virtual verification standard value in the metering assurance plan of the charging pile group is: ; In the formula, the subscript k represents the kth calculation, where k ≥ 2; A i is the β th i element of the matrix β , representing the solution error coefficient of the ith charging pile; the matrix β refers to the matrix of solution error coefficients of each charging pile in the charging pile group, and the calculation formula of the matrix is: In the formula, the superscript T represents matrix transpose; the matrices E and E t are respectively: , ; Among them, the matrix E t Chinese elements E tx The total energy meter for the charging station is x Readings at each moment; ε 0 is the fixed loss in the charging station; 1 N×1 is a matrix with N rows and 1 column and all 1s; E Chinese elements E xi For the charging station i Pile No. x Readings at each moment; η i For the i The AC-DC conversion efficiency of a pile, if it is an AC pile, then η i =1; a measurement contains N moments, x=1, 2, ...N; Each moment measures n Data of piles i=1, 2, …n ; Among them, the number of moments N> the number of charging piles n.

[0015] Furthermore, the process parameters of the virtual verification standard include verification standard value approval value A c and standard deviation recognized values S c ; The verification standard value approved value A c The calculation method is: ; Where M is the number of measurements, where 2≤M≤k; Standard deviation recognized value S c The calculation method is: ; The method for controlling the error characteristics of a charging pile group using the process parameters of a virtual verification standard in the error characteristic control and correction module includes: (1) When each additional calculation is added after the kth calculation, it is recorded as the kth k+l Calculation, l ≥1; calculate the standard value of this virtual verification C k+l ;but: ; (2) Calculate the t statistic t c : ; (3) If and only if t cWhen t ≤ 3, it is considered that the errors of all piles in the pile group do not exceed the control limit, that is, it meets the normal use requirements; otherwise, it is considered that the error of at least one pile in the pile group exceeds the tolerance, and then manual verification and calibration are carried out.

[0016] Furthermore, the method for the error characteristic control and correction module to control the process parameters of the virtual verification standard for the charging pile group includes: When t c > 3, manual verification is carried out on T piles in the charging pile group or standard power modules are installed. T is the number of charging piles with out-of-tolerance. The standard power module is used to realize the error calibration of the charging pile group. M measurements are carried out on these T piles to obtain the error verification values d yz , y = 1, 2, …, T, 1 ≤ T < N; z = 1, 2, …, M, and calculate their mean value A c ’ and standard deviation S c ’ ; ; If the t-statistic , and S c ’ ≤ S c , then the process parameters of the virtual verification standard are controlled and do not need to be corrected; otherwise, correct A c to A c ’

[0017] In a third aspect, the present invention provides an electronic device, including a memory, a processor, and a computer program stored on the memory and executable on the processor. When the processor executes the program, the method described in the first aspect is implemented.

[0018] In a fourth aspect, the present invention provides a computer-readable storage medium, on which a computer program is stored. When the program is executed by a processor, the method described in the first aspect is implemented.

[0019] One or more technical solutions provided by the present invention have at least the following technical effects or advantages: introducing the idea of the metrological assurance program into the metrological verification of the charging pile group, using the total meter power measurement data of the charging station and the power measurement data of each pile in the pile group in the station, establishing a virtual verification standard value based on energy conservation, calculating the process parameters of the virtual verification standard, forming a virtual verification standard model to monitor the error characteristics of the charging pile group, continuously monitoring the errors of each pile in the pile group through a closed-loop control method, updating the control process of the metrological assurance program system for the charging pile group by manual verification or installing standard modules through a sampling plan, ensuring the effectiveness of the virtual verification standard, ensuring the continuous effectiveness of error control, and thus ensuring the fairness of charging.

[0020] The above description is only an overview of the technical solution of the present invention. In order to more clearly understand the technical means of the present invention, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the present invention more obvious and easy to understand, the specific implementation methods of the present invention are specifically listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0022] Figure 1 is a flow chart of the method in embodiment 1 of the present invention; Figure 2 This is a schematic structural diagram of the device in Example 2 of the present invention; Figure 3 This is a schematic structural diagram of an electronic device in a third embodiment of the present invention; Figure 4 Schematic diagram of the structure of the medium in the fourth embodiment of the present invention. DETAILED DESCRIPTION

[0023] The embodiment of the present application provides a control method, device, equipment and medium for process parameters of charging pile group verification. The overall idea is as follows: Based on the measurement assurance solution system, the energy measurement data of the charging station master meter and the energy measurement data of each pile in the station pile group are used to establish a virtual verification standard value based on energy conservation, and then calculate the process parameter verification standard value acceptance value. A c and standard deviation recognized values S c , forming a virtual verification standard model, and calculating the statistic t c The error characteristics of the charging pile group are controlled to form a closed-loop feedback mechanism. When deviations are detected, the control process of the charging pile group in the measurement assurance solution system is updated through manual verification of the sampling plan or the built-in standard module to ensure the continued effectiveness of error control.

[0024] Example 1 This embodiment provides a method for controlling the error characteristics of a charging pile group. Figure 1 As shown, the following steps are included: S101. Calculate the virtual verification standard value in the charging pile group metering assurance plan based on the law of conservation of energy; The calculation method of the virtual verification standard value is: ; Where, the subscript k represents the kth calculation, where k ≥ 2; A i is a matrix β No. i Elements represent the error coefficient of the solution of the i-th charging pile; the matrix βRefers to the error coefficient matrix of each charging pile in the charging pile group. β The calculation formula is: ; In the formula, the superscript T Represents matrix transpose; matrix E and E t They are: , ; Among them, the matrix E t Chinese elements E tx The total energy meter for the charging station is x Readings at each moment; ε 0 is the fixed loss in the charging station; 1 N×1 is a matrix with N rows and 1 column and all 1s; E Chinese elements E xi For the charging station i Pile No. x Readings at each moment; η i For the i The AC-DC conversion efficiency of a pile, if it is an AC pile, then η i =1; a measurement contains N moments, x=1, 2, ...N; Each moment measures n Data of piles i=1, 2, …n ; Among them, the number of moments N> the number of charging piles n.

[0025] The overall error characteristics of the charging pile group are dynamically captured through matrix operations, avoiding reliance on data at a single moment and significantly improving the robustness of the error model.

[0026] S102. Based on the virtual verification standard value, calculate the process parameters of the virtual verification standard in the charging pile group metering assurance solution; the process parameters of the virtual verification standard include the verification standard value approval value A c and standard deviation recognized values S c ; The verification standard value approved value A c The calculation method is: ; Where M is the number of measurements, where 2≤M≤k; Standard deviation recognized value S c The calculation method is: ; By means of the sliding window statistical method, the process parameters are dynamically updated to ensure that the model adapts to the long-term operation changes of the charging pile group (such as equipment aging or environmental fluctuations).

[0027] S103. Control the error characteristics of the charging pile group according to the process parameters of the virtual verification standard; during the control process, if it is found that the errors of all piles in the charging pile group exceed the control limit, the process parameters of the virtual verification standard in the metering assurance plan of the charging pile group shall be corrected.

[0028] The method for process control of the error characteristics of the charging pile group by using the process parameters of the virtual verification standard in step S103 includes: (1) When each new calculation is added after the k-th calculation, it is recorded as the k+l -th calculation, l ≥1; calculate the virtual verification standard value C k+l at this time; then: ; (2) Calculate the t statistic t c : ; (3) When and only when t c ≤ 3 (confidence level 99.7%), it is considered that the errors of all piles in the pile group do not exceed the control limit, that is, the normal use requirements are met; otherwise, when t c > 3, it is considered that the error of at least one pile in the pile group exceeds the tolerance, and the correction process is triggered for manual verification and calibration, that is: the method for controlling the process parameters of the virtual verification standard of the charging pile group includes: When t<00神仙道0072> > 3, perform manual verification or install standard power modules on T piles in the charging pile group, and perform M measurements on these T piles to obtain the error verification values d yz of these T piles, y = 1, 2,..., T, 1 ≤ T < N; z = 1, 2,..., M, and calculate their mean value A c ' and standard deviation S c ': <神仙道00350>; ; If the t statistic , and S c ' ≤ S c , the process parameters of the virtual verification standard are controlled and do not need to be corrected; otherwise, correct A c to A c '.

[0029] Therefore, the model parameters can be corrected in real time through closed-loop feedback, which can reduce the error control rate to less than 0.5%.

[0030] Example 2 Based on the same inventive concept, this application also provides a device corresponding to the method in Example 1, see Example 2 for details.

[0031] like Figure 2 As shown, in this embodiment, a device for controlling the error characteristics of a charging pile group is provided, which includes a simulation verification standard value calculation module, a process parameter calculation module, and an error characteristic control and correction module.

[0032] The simulation verification standard value calculation module is used to calculate the virtual verification standard value in the charging pile group metering assurance plan; the calculation method is: ; Where, the subscript k represents the kth calculation, where k ≥ 2; A i is a matrix β No. i elements, representing the error coefficient of the solution of the i-th charging pile; the matrix β Refers to the error coefficient matrix of each charging pile in the charging pile group. β The calculation formula is: ; In the formula, the superscript T Represents matrix transpose; matrix E and E t They are: , ; Among them, the matrix E t Chinese elements E tx The total energy meter for the charging station is x Readings at each moment; ε 0 is the fixed loss in the charging station; 1 N×1 is a matrix with N rows and 1 column and all 1s; E Chinese elements E xi For the charging station i Pile No. x Readings at each moment; η i For the i The AC-DC conversion efficiency of a pile, if it is an AC pile, then η i =1; a measurement contains N moments, x=1, 2, ...N; Each moment measures n Data of piles i=1, 2, …n; Among them, the number of moments N> the number of charging piles n.

[0033] The process parameter calculation module is used to calculate the process parameters of the virtual verification standard in the charging pile group metering assurance solution based on the virtual verification standard value; the process parameters of the virtual verification standard include the verification standard value approval value A c and standard deviation recognized values S c ; The verification standard value approved value A c The calculation method is: ; Where M is the number of measurements, where 2≤M≤k; Standard deviation recognized value S c The calculation method is: ; The error characteristic control and correction module is used to control the error characteristics of the charging pile group according to the process parameters of the virtual verification standard; during the control process, if it is found that the errors of all piles in the charging pile group exceed the control limit, the process parameters of the virtual verification standard in the charging pile group measurement assurance plan are corrected.

[0034] The method for controlling the error characteristics of a charging pile group using the process parameters of a virtual verification standard in the error characteristic control and correction module includes: (1) When each additional calculation is added after the kth calculation, it is recorded as the kth k+l Calculation, l ≥1; calculate the standard value of this virtual verification C k+l ;but: ; (2) Calculate the t statistic t c : ; (3) If and only if t c When t ≤ 3, it is considered that the errors of all piles in the pile group do not exceed the control limit, that is, they meet the normal use requirements; otherwise, when t c When the error is greater than 3, it is considered that at least one pile in the pile group has exceeded the tolerance, and manual verification and calibration are required, that is, the process parameters of the virtual verification standard of the charging pile group are controlled; The method for controlling the process parameters of the virtual verification standard of the charging pile group includes: When t c When the error is greater than 3, manually calibrate T piles in the charging pile group or install standard power modules, and measure these T piles M times to obtain the error calibration value of T piles as d yz, where \(y = 1, 2, \ldots, T\), \(1\leq T\lt N\); \(z = 1, 2, \ldots, M\), calculate its mean value A c ’ and standard deviation S c ’: ; ; If the t-statistic , and S c ’ ≤ S c , then the process parameters of the virtual verification standard are controlled and do not need to be corrected; otherwise, correct A c to be A c ’.

[0035] Update the control process of the charging pile group of the metrological assurance scheme system through manual verification of the sampling plan or the built-in standard module, and correct the model parameters in real time through closed-loop feedback, which can reduce the error control error rate to less than 0.5%.

[0036] Example 3 Based on the same inventive concept, this application provides an electronic device embodiment corresponding to Embodiment 1. For details, see Example 3.

[0037] As Figure 3 shown, this embodiment provides an electronic device, including a memory, a processor, and a computer program stored on the memory and executable on the processor. When the processor executes the computer program, any implementation manner of Embodiment 1 can be realized.

[0038] Since the electronic device introduced in this embodiment is the device used to implement the method in Embodiment 1 of this application, based on the method introduced in Embodiment 1 of this application, those skilled in the art can understand the specific implementation manner and various variations of the electronic device in this embodiment. Therefore, the specific implementation of how this electronic device realizes the method in Embodiment 1 of this application will not be described in detail here. As long as the device used by those skilled in the art to implement the method in Embodiment 1 of this application belongs to the scope to be protected by this application.

[0039] Example 4 Based on the same inventive concept, this application provides a storage medium corresponding to Embodiment 1. For details, see Example 4.

[0040] As Figure 4 shown, this embodiment provides a computer-readable storage medium, on which a computer program is stored. When the computer program is executed by a processor, any implementation manner in Embodiment 1 can be realized.

[0041] ​The technical solution provided in the embodiments of the present application has at least the following technical effects or advantages: introducing the idea of ​​the metering assurance scheme into the metering calibration of the charging pile group, using the electric energy measurement data of the charging station's total meter and the electric energy measurement data of each pile in the pile group within the station, and establishing a virtual verification standard value based on energy conservation, calculating the process parameters of the virtual verification standard, forming a virtual verification standard model to monitor the error characteristics of the charging pile group, continuously monitoring the errors of each pile in the pile group through closed-loop control, and updating the control process of the charging pile group of the metering assurance scheme system through manual calibration of the sampling scheme or installation of the standard module, thereby ensuring the effectiveness of the virtual verification standard and improving the efficiency of the charging pile calibration.

[0042] It will be understood by those skilled in the art that embodiments of the present invention may be provided as methods, systems, or computer program products. Thus, the present invention may take the form of an entirely hardware embodiment, an entirely software embodiment, or an embodiment combining software and hardware. Furthermore, 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 magnetic disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0043] 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 flowcharts and / or block diagrams, as well as combinations of processes and / or blocks in the flowcharts and / or block diagrams, 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 flowcharts and / or block diagrams. 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.

[0044] These computer program instructions may also be stored in a computer readable memory that can direct a computer or other programmable data processing device to work in a specific manner, so that the instructions stored in the computer readable memory produce an article of manufacture comprising an instruction device, which implements the process Figure 1 a process or multiple processes and / or boxes Figure 1 The function specified in one or more boxes.

[0045] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operational steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing the instructions executed on the computer or other programmable device for implementing the process. Figure 1a process or multiple processes and / or boxes Figure 1 A step that specifies a function in one or more boxes.

[0046] Although the specific embodiments of the present invention are described above, those skilled in the art should understand that the specific embodiments described are merely illustrative and are not intended to limit the scope of the present invention. Equivalent modifications and changes made by those skilled in the art in accordance with the spirit of the present invention should be included within the scope of protection of the claims of the present invention.

Claims

1. A method for controlling the error characteristics of a charging pile group, characterized by: The following steps are involved: S101. Calculate the virtual verification standard value in the charging pile group metering assurance plan. The calculation method is: ; Where, the subscript k represents the kth calculation, where k ≥ 2; A i is a matrix β No. i elements, representing the error coefficient of the solution of the i-th charging pile; matrix β Refers to the error coefficient matrix of each charging pile in the charging pile group. β The calculation formula is: ; In the formula, the superscript T Represents matrix transpose; matrix E and E t They are: , ; Among them, the matrix E t Chinese elements E tx The total energy meter for the charging station is x Readings at each moment; ε 0 is the fixed loss in the charging station; 1 N×1 is a matrix with N rows and 1 column and all 1s; E Chinese elements E xi For the charging station i Pile No. x Readings at each moment; η i For the i The AC-DC conversion efficiency of a pile, if it is an AC pile, then η i =1; a measurement contains N moments, x=1, 2, ...N; Each moment measures n Data of piles i=1, 2, …n ; Among them, the number of moments N> the number of charging piles n; S102: Calculate the process parameters of the virtual verification standard in the charging pile group metering assurance solution based on the virtual verification standard value, wherein the process parameters of the virtual verification standard include the verification standard value approval value A c and standard deviation recognized values S c ; The verification standard value approved value A c The calculation method is: ; Where M is the number of measurements, where 2≤M≤k; Standard deviation recognized value S c The calculation method is: ; S103. Controlling the error characteristics of the charging pile group according to the process parameters of the virtual verification standard; during the control process, if it is found that the errors of all piles in the charging pile group exceed the control limit, correcting the process parameters of the virtual verification standard in the charging pile group measurement assurance scheme. The method for controlling the error characteristics of the charging pile group according to the process parameters of the virtual verification standard includes: (1) When each additional calculation is added after the kth calculation, it is recorded as the kth k+l times calculation, l ≥1; calculate the standard value of this virtual verification C k+l ;but: ; (2) Calculate the t statistic t c : ; (3) If and only if t c When t ≤ 3, it is considered that the errors of all piles in the pile group do not exceed the control limit, that is, they meet the normal use requirements; otherwise, when t c When >3, it is considered that the error of at least one pile in the pile group exceeds the tolerance, and the correction process is triggered.

2. The method according to claim 1, wherein the correction process is: When t c > 3, conduct manual verification or install standard power modules for T charging piles in the charging pile group. Conduct M measurements on these T charging piles, and the error verification values of the T charging piles are d yz , where y = 1, 2, …, T, 1 ≤ T < N; z = 1, 2, …, M, and calculate its mean value A c ’ and standard deviation S c ’: ; ; If the t statistic ,and S c '≤ S c , then the process parameters of the virtual verification standard are under control and do not need to be corrected; otherwise, A c for A c '.

3. A device for controlling the error characteristics of a charging pile group, characterized by: include: The simulation verification standard value calculation module is used to calculate the virtual verification standard value in the charging pile group metering assurance plan. The calculation method is: ; Where, the subscript k represents the kth calculation, where k ≥ 2; A i is a matrix β No. i elements, representing the error coefficient of the solution of the i-th charging pile; matrix β Refers to the error coefficient matrix of each charging pile in the charging pile group. β The calculation formula is: ; In the formula, the superscript T Represents matrix transpose; matrix E and E t They are: , ; Among them, the matrix E t Chinese elements E tx The total energy meter for the charging station is x Readings at each moment; ε 0 is the fixed loss in the charging station; 1 N×1 is a matrix with N rows and 1 column and all 1s; E Chinese elements E xi for Charging station i Pile No. x Readings at each moment; η i For the i The AC-DC conversion efficiency of a pile, if it is an AC pile, then η i =1; a measurement contains N moments, x=1, 2, ...N; Each moment measures n Data of piles i=1, 2, …n ; Among them, the number of moments N> the number of charging piles n; The process parameter calculation module is used to calculate the process parameters of the virtual verification standard in the charging pile group metering assurance solution based on the virtual verification standard value. The process parameters of the virtual verification standard include the verification standard value approval value. A c and standard deviation recognized values S c ; The verification standard value approved value A c The calculation method is: ; Where M is the number of measurements, where 2≤M≤k; Standard deviation recognized value S c The calculation method is: ; The error characteristic control and correction module is used to control the error characteristics of the charging pile group according to the process parameters of the virtual verification standard. During the control process, if it is found that the errors of all piles in the charging pile group exceed the control limit, the process parameters of the virtual verification standard in the charging pile group measurement assurance plan are corrected. The method of using the process parameters of the virtual verification standard to control the error characteristics of the charging pile group in the error characteristic control and correction module includes: (1) When each additional calculation is added after the kth calculation, it is recorded as the kth k+l times calculation, l ≥1; calculate the standard value of this virtual verification C k+l ;but: ; (2) Calculate the t statistic t c : ; (3) If and only if t c When t ≤ 3, it is considered that the errors of all piles in the pile group do not exceed the control limit, that is, they meet the normal use requirements; otherwise, when t c When >3, it is considered that the error of at least one pile in the pile group exceeds the tolerance, and the correction process is triggered.

4. The device according to claim 3, characterized in that: The correction process is as follows: When t c > 3, manually calibrate or install standard power modules for T charging piles in the charging pile group, and perform M measurements on these T charging piles to obtain the error calibration values d yz , where y = 1, 2, …, T, 1 ≤ T < N; z = 1, 2, …, M, and calculate its mean value A c ’ and standard deviation S c 0]]’: ; ; If the t statistic ,and S c '≤ S c , then the process parameters of the virtual verification standard are under control and do not need to be corrected; otherwise, A c for A c '.

5. An electronic device comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein: When the processor executes the program, the method according to claim 1 or 2 is implemented.

6. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the program is executed by a processor, the method according to claim 1 or 2 is implemented.

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