Alternating current and direct current charging pile metering performance and output electric energy quality diagnosis system

Abstract

The invention discloses an AC / DC charging pile metering performance and output electric energy quality diagnosis system, and belongs to the technical field of electric energy quality diagnosis. Comprising a high-precision data acquisition module, a remote communication and protocol interaction module, a metering performance online verification module, an electric energy quality evaluation module, a temperature monitoring and early warning module, a health state evaluation module and a data storage and traceability module. Extracting amplitudes and phases of fundamental waves and multiple harmonic waves, and calculating total harmonic distortion and a harmonic distortion rate; a bandwidth resolution is set through ripple analysis, high-frequency fluctuation characteristics are captured, and energy efficiency deviation is quantified by combining the difference between a battery demand value and an actual output value in a BCL message; through comprehensive analysis of harmonic waves and ripples, electric energy quality reduction caused by problems of line impedance, poor contact and the like of the charging pile is identified, an energy efficiency optimization basis is provided for an operator, and the service life of the charging pile is prolonged.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of power quality diagnosis, and particularly relates to an alternating current and direct current charging pile metering performance and output power quality diagnosis system. BACKGROUND

[0002] With the rapid development of the electric vehicle industry, the number of charging piles is increasing rapidly, and under the promotion of national mandatory verification requirements and the double carbon strategy, intelligent and remote metering and power quality diagnosis systems are urgently needed to realize charging pile life cycle quality monitoring, fault early warning and energy efficiency optimization, and to ensure charging safety and metering accuracy.

[0003] However, the existing alternating current and direct current charging pile metering performance and output power quality diagnosis system still has certain defects, and the existing communication and data security rely on 4G / 5G network, which has the risk of network interruption leading to service interruption; although it is compatible with multiple brands of charging piles, it may still face compatibility problems caused by protocol differences in actual deployment; the fixed threshold of temperature monitoring lacks environmental adaptability, which may cause false alarm or omission due to working condition difference, therefore, an alternating current and direct current charging pile metering performance and output power quality diagnosis system is proposed. SUMMARY

[0004] The purpose of the present application is to provide an alternating current and direct current charging pile metering performance and output power quality diagnosis system to solve the problems raised in the background.

[0005] To achieve the above purpose, the present application provides the following technical scheme: an alternating current and direct current charging pile metering performance and output power quality diagnosis system, comprising a high-precision data acquisition module, a remote communication and protocol interaction module, a metering performance online verification module, a power quality evaluation module, a temperature monitoring and early warning module, a health state evaluation module, a data storage and traceability module;

[0006] The high-precision data acquisition module acquires real-time voltage, current, power, energy, frequency, harmonic, ripple and charging gun interface temperature key parameters of the charging pile and transmits them to the metering performance online verification module and the power quality evaluation module;

[0007] The remote communication and protocol interaction module realizes bidirectional data interaction between the metering performance online verification module and the health state evaluation module and the operation platform through the 4G / 5G network test instrument;

[0008] The metering performance online verification module receives the data collected by the high-precision data acquisition module, verifies the metering accuracy of the alternating current and direct current charging pile based on the real load test method and the order energy comparison algorithm, and then transmits it to the data storage and traceability module;

[0009] The power quality evaluation module analyzes voltage, current harmonics and ripples through discrete Fourier transform, evaluates output stability and energy efficiency deviation, and then outputs to the health state evaluation module;

[0010] The temperature monitoring and early warning module triggers an overheating early warning by setting a threshold value and analyzes the influence on metering through deploying temperature sensors on the gun head and gun seat;

[0011] The health state evaluation module builds a health index model by comprehensively analyzing energy efficiency, temperature and fault message data, outputs a health level and inputs to the temperature monitoring and early warning module;

[0012] The data storage and traceability module receives data from the metering performance online verification module and the health state evaluation module, stores full-quantity data of the charging process locally, and calibrates the detector through a multi-table independent voltage and current source and a standard meter.

[0013] The high-precision data acquisition module collects real-time output voltage, current, power, electric energy, frequency, harmonics, ripples and charging gun interface temperature key parameters of the charging pile through a 0.05-level lightweight switching wide-range tester, and integrates GPS and Beidou clock modules for time synchronization with the charging pile and the operation platform.

[0014] The remote communication and protocol interaction module realizes two-way data interaction under 4G / 5G network based on a double-layer protocol architecture; the communication layer is responsible for device registration, identity authentication, command issuance and event reporting, and the business layer realizes business closed loop through order electric quantity comparison, verification task execution and abnormal data upload logic; data interaction adopts JSON and XML format packaging, combined with SSL and TLS protocols and asymmetric encryption of digital certificates of State Grid Electric Power Research Institute, to ensure consistency and tamper resistance of data transmission between management information areas and Internet areas.

[0015] The remote communication and protocol interaction module on the device side is connected through 4G / 5G module and protocol stack, simulates registration, authentication and data reporting scenarios to verify communication stability; the platform side integrates the charging pile management platform of the provincial company, simulates order electric quantity comparison and verification task issuance business logic, and tests the encryption transmission process between isolation devices through the power supervision service platform; the protocol latency and encryption efficiency are optimized, the disconnection and reconnection mechanism is improved, and the module is deployed to typical charging stations for demonstration application.

[0016] The metering performance online verification module verifies the metering accuracy of AC and DC charging piles through real load test method and order electric quantity comparison algorithm: DC piles compare the start and end time of charging in BMS message with the standard electric quantity accumulated by the detector and the order electric quantity generated by the charging pile operation platform, calculate the error and determine whether it is qualified according to the verification regulation, the formula is:

[0017]

[0018] In the formula, - the difference between the apparent value of the electric energy when the tested charging pile stops charging and when charging starts, kW·h, - the electric energy value measured by the verification instrument, kW·h, - the system error of the verification device, which is not required to be corrected when = 0.

[0019] The AC pile of the on-line verification module of the metering performance determines the charging stage by analyzing the PWM pulse width signal, determines the start and end time of the charging process in combination with the CP and PE voltage values, simultaneously collects the electric quantity data of the verification instrument and the platform order for error analysis, and realizes the formula:

[0020]

[0021] In the formula, - the difference between the apparent value of the electric energy when the tested charging pile stops charging and when charging starts, kW·h; - the electric energy value measured by the verification instrument, kW·h; - the system error of the verification device, which is not required to be corrected when = 0.

[0022] During the verification process, the GPS and Beidou clock modules built in the equipment guarantee time synchronization with the charging pile and the platform, and the verification result is uploaded to the operation platform through remote communication, thereby completing the on-line metering verification under the condition of no operation.

[0023] The power quality evaluation module performs frequency spectrum analysis on the voltage and current signals output by the charging pile through discrete Fourier transform, decomposes the amplitude and phase of the fundamental wave and multiple harmonics, calculates the harmonic distortion rate and total harmonic distortion, sets the measurement parameters of bandwidth and resolution for ripple analysis, and extracts the ripple content characteristics; by comparing the difference between the voltage and current set values and the actual output values of the battery demand in the charging pile BCL message, the output efficiency deviation is evaluated, and the harmonic and ripple analysis results are comprehensively judged to evaluate the output stability of the charging pile, and the evaluation data is uploaded to the operation platform for quality diagnosis and energy efficiency optimization.

[0024] The temperature monitoring and early warning module monitors the temperature change of the gun head and the gun seat interface in real time during the charging process by deploying temperature sensors on the gun head side and the gun seat side, pre-sets an overheating warning threshold, triggers a warning signal when the monitored temperature exceeds the threshold, and uploads it to the operation platform; at the same time, the contact state of the charging gun is analyzed in combination with the temperature change trend, the influence of temperature abnormity on the metering error of the charging pile is evaluated, and the platform prompts the maintenance personnel to troubleshoot and replace the charging gun.

[0025] The health state evaluation module constructs a health index model by analyzing the energy efficiency data collected during the operation of the charging pile, the temperature change trend of the charging gun interface monitored by the temperature sensor and the fault information in the CST and BMS messages, calculates the health index through adjustable weights, divides the health index into four levels according to a preset threshold, and uploads the result to the operation platform as the basis for the operation and maintenance personnel to judge whether the charging pile needs to be maintained and replaced.

[0026] The data storage and traceability module stores the full data of the charging process in the built-in solid state memory of the tester, and adopts a multi-table independent voltage source, a current source and a standard table to periodically calibrate the tester; in a laboratory environment, the tester's measurement value is synchronously collected by combining a multi-channel independent voltage and current source output standard signal and a high-precision standard table, the error is compared and analyzed, and a calibration certificate is generated; the data integrity is prevented from being tampered with by block chain technology and digital signature, and a complete data traceability chain is formed.

[0027] Compared with the prior art, the beneficial effects of the present application are:

[0028] 1. The present application realizes the bidirectional data interaction between the tester and the operation platform through 5G and 4G networks, and the double-layer protocol architecture manages device registration, command issuing, data uploading and other tasks in layers, thereby improving the system response speed and stability; the asymmetric encryption technology of SSL, TLS and the digital certificate of the State Grid Electric Power Research Institute is adopted to ensure the transmission consistency and tamper resistance of data between the management information area and the Internet area isolation device through the public key and private key mechanism, support real-time uploading and remote control of large-scale charging pile data, reduce the cost of manual inspection, meet the regulatory requirements of the state on the traceability of charging pile metering data, and promote the interconnection of industry detection equipment through the design of standardized communication protocols;

[0029] 2. The present application performs frequency spectrum analysis on the voltage and current signals through discrete Fourier transform, extracts the amplitude and phase of the fundamental wave and multiple harmonics, calculates the total harmonic distortion and harmonic distortion rate, and accurately evaluates the output stability; the ripple analysis sets the bandwidth resolution to capture the high-frequency fluctuation characteristics, and quantifies the energy efficiency deviation by combining the difference between the battery demand value and the actual output value in the BCL message; through harmonic and ripple comprehensive analysis, the power quality decline caused by problems such as line impedance and poor contact of the charging pile is identified, providing the basis for energy efficiency optimization for operators; after the data is uploaded to the operation platform, fault early warning and health state evaluation are supported, and the service life of the charging pile is prolonged;

[0030] 3、The application monitors the temperature change of the interface in the charging process in real time through the gun head and the gun seat side temperature sensor, triggers a warning when the preset threshold is reached, prevents safety accidents caused by poor contact and short circuit, identifies potential faults such as aging and loosening of the charging gun by combining temperature trend analysis, evaluates the influence of the charging gun on the metering error of the charging pile, uploads the warning information to the operation platform through the 5G network, prompts the operation and maintenance personnel to timely troubleshoot or replace the charging gun, reduces the risk of fire and overcharging of the battery, avoids modifying the structure of the charging pile through non-contact deployment, adapts to existing charging facilities, provides key safety protection for the edge charging and edge detection mode, and reduces the charging interruption and maintenance cost caused by temperature faults. BRIEF DESCRIPTION OF DRAWINGS

[0031] Figure 1 It is a structural diagram of the AC / DC charging pile metering performance and output power quality diagnosis system of the application;

[0032] Figure 2 It is a running process of the AC / DC charging pile metering performance and output power quality diagnosis system of the application Figure One ;

[0033] Figure 3 It is a running process of the AC / DC charging pile metering performance and output power quality diagnosis system of the application Figure Two . DETAILED DESCRIPTION

[0034] The technical solutions in the embodiments of the application will be described clearly and completely below with reference to the drawings in the embodiments of the application. Obviously, the described embodiments are only part of the embodiments of the application, rather than all the embodiments of the application. Based on the embodiments in the application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the application.

[0035] EMBODIMENT

[0036] Please refer to Figures 1-3 The application provides a technical solution: including a high-precision data acquisition module, a remote communication and protocol interaction module, an online metering performance verification module, an electric energy quality evaluation module, a temperature monitoring and warning module, a health state evaluation module, a data storage and traceability module;

[0037] The high-precision data acquisition module acquires the voltage, current, power, electric energy, frequency, harmonic, ripple and charging gun interface temperature key parameters of the charging pile in real time and transmits them to the online metering performance verification module and the electric energy quality evaluation module;

[0038] The remote communication and protocol interaction module realizes the bidirectional data interaction between the online metering performance verification module and the health state evaluation module and the operation platform through the 4G / 5G network test instrument.

[0039] The metering performance online verification module receives the data collected by the high-precision data acquisition module, verifies the metering accuracy of the AC / DC charging pile based on the real load test method and the order power comparison algorithm, and then transmits to the data storage and traceability module;

[0040] The power quality evaluation module analyzes voltage, current harmonics and ripples through discrete Fourier transform, evaluates output stability and energy efficiency deviation, and then outputs to the health state evaluation module;

[0041] The temperature monitoring and early warning module triggers an overheating warning by setting a threshold and analyzes the influence of metering by deploying gun head and gun seat temperature sensors;

[0042] The health state evaluation module constructs a health index model by integrating energy efficiency, temperature, and fault message data, outputs a health level, and inputs to the temperature monitoring and early warning module;

[0043] The data storage and traceability module receives data from the metering performance online verification module and the health state evaluation module, stores full-quantity data of the charging process locally, and calibrates the detector by using multiple table positions, independent voltage and current sources, and standard tables.

[0044] The high-precision data acquisition module collects real-time output voltage, current, power, energy, frequency, harmonics, ripples, and charging gun interface temperature key parameters by deploying 0.05 level lightweight switching type wide range tester, and integrates GPS and Beidou clock modules for time synchronization with charging piles and operation platforms.

[0045] The remote communication and protocol interaction module realizes bidirectional data interaction under 4G / 5G network based on a double-layer protocol architecture; the communication layer is responsible for device registration, identity authentication, command issuance, and event reporting, and the business layer realizes business closed loop through order power comparison, verification task execution, and abnormal data upload logic; data interaction is packaged in JSON and XML formats, combined with SSL and TLS protocols and asymmetric encryption of digital certificates from the State Grid Electric Power Research Institute, to ensure consistency and tamper resistance of data transmission between management information zones and Internet zones.

[0046] The remote communication and protocol interaction module on the device side interfaces with the 4G / 5G module and protocol stack, simulates registration, authentication, and data reporting scenarios to verify communication stability; the platform side integrates the charging pile management platform of the provincial company, simulates order power comparison and verification task issuance business logic, and tests the encryption transmission process between isolation devices through the power supervision service platform; the protocol latency and encryption efficiency are optimized, the disconnection and reconnection mechanism is improved, and the module is deployed to typical charging stations for demonstration application.

[0047] The metering performance online verification module verifies the metering accuracy of the AC / DC charging pile through the real load test method and the order electric quantity comparison algorithm: the DC pile compares the charging start time and end time in the BMS message, combines the standard electric quantity accumulated by the verification instrument with the order electric quantity generated by the charging pile operation platform, calculates the error, and determines whether it is qualified according to the verification regulation, and the formula is:

[0048]

[0049] In the formula, The difference between the electric energy indication value when the charging pile stops charging and when the charging starts, kW·h, The electric energy value measured by the verification instrument, kW·h, The fixed system error of the verification device, when no correction is needed = 0.

[0050] The AC pile of the metering performance online verification module determines the charging stage by analyzing the PWM pulse width signal, determines the start and end time of the charging process by combining the CP and PE voltage values, and collects the electric quantity data of the verification instrument and the platform order for error analysis, and the formula is:

[0051]

[0052] In the formula, The difference between the electric energy indication value when the charging pile stops charging and when the charging starts, kW·h; The electric energy value measured by the verification instrument, kW·h; The fixed system error of the verification device, when no correction is needed = 0.

[0053] During the verification process, the GPS and Beidou clock modules built-in the device ensure time synchronization with the charging pile and the platform, and the verification result is uploaded to the operation platform through remote communication to complete online metering verification without manual operation.

[0054] The power quality evaluation module performs frequency spectrum analysis on the voltage and current signals output by the charging pile through discrete Fourier transform, decomposes the amplitude and phase of the fundamental wave and multiple harmonics, calculates the harmonic distortion rate and total harmonic distortion, sets the measurement parameters of bandwidth and resolution for ripple analysis, and extracts the ripple content characteristics; by comparing the difference between the voltage and current set values and the actual output values of the battery demand in the charging pile BCL message, the output efficiency deviation is evaluated, and the harmonic and ripple analysis results are combined to comprehensively judge the output stability of the charging pile. The evaluation data is uploaded to the operation platform for quality diagnosis and energy efficiency optimization.

[0055] The temperature monitoring and early warning module monitors the temperature change of the gun head and the gun seat interface in real time during the charging process by deploying temperature sensors on the charging pile gun head side and the gun seat side, pre-sets an overheating early warning threshold, triggers an early warning signal when the monitored temperature exceeds the threshold, and uploads it to the operation platform; at the same time, the charging gun contact state is analyzed combined with the temperature change trend, the influence of temperature abnormity on the charging pile metering error is evaluated, and the maintenance personnel is prompted through the platform to troubleshoot and replace the charging gun.

[0056] The health state evaluation module analyzes the energy efficiency data collected during the operation of the charging pile, the temperature change trend of the charging gun interface monitored by the temperature sensor, and the fault information in the CST and BMS messages, constructs a health index model, calculates the health index through adjustable weight, divides the health index into four levels according to the preset threshold, and uploads the result to the operation platform as the basis for the maintenance personnel to judge whether the charging pile needs to be maintained and replaced.

[0057] The data storage and traceability module stores the full data of the charging process in the built-in solid state memory of the detector, and uses a multi-table independent voltage source, a current source and a standard table to periodically calibrate the detector: in the laboratory environment, the standard signal is output by the multi-channel independent voltage and current source, the measurement value of the detector is synchronously collected by the high-precision standard table, the error is compared and analyzed, and the calibration certificate is generated; the data integrity is prevented from being tampered with by using blockchain technology and digital signature, and a complete data traceability chain is formed.

[0058] Working principle: the nine modules realize the online diagnosis of the AC and DC charging pile metering performance and power quality, the high-precision data acquisition module uses a 0.1-level wide-range tester to acquire parameters in real time and synchronously timestamps; the remote communication module is based on a 5G and 4G double-layer protocol architecture, combined with SSL and TLS encryption and the digital certificate of the State Grid to ensure data security; the metering and verification module verifies the error by the order power comparison algorithm and supports edge charging and edge detection; the power quality module uses DFT to analyze harmonics and ripples, and compares BCL messages to evaluate energy efficiency; the temperature early warning module monitors the temperature of the gun head and the gun seat, and triggers an overheating early warning; the health evaluation module constructs an adjustable weight model to output a health level; the data storage module locally stores full data and calibrates the detector, and the blockchain technology ensures anti-tampering.

[0059] Although embodiments of the present application have been shown and described, it will be understood by those having ordinary skill in the art that various changes, modifications, substitutions and alterations can be made thereto without departing from the principles and spirit of the present application, the scope of which is defined by the appended claims and their equivalents.

[0060] The above describes the present application and its embodiments, which are not limited, and the drawings only show one of the embodiments of the present application, and the actual structure is not limited thereto. In general, if a person skilled in the art is inspired thereby, without departing from the purpose of the present application, without creative design, similar structure and embodiments of the technical solution are not creative, and should belong to the protection scope of the present application.

Claims

1. An AC / DC charging pile metering performance and output power quality diagnosis system, characterized in that: The high-precision data acquisition module, the remote communication and protocol interaction module, the metering performance online verification module, the power quality evaluation module, the temperature monitoring and early warning module, the health state evaluation module, and the data storage and traceability module are included. The high-precision data acquisition module acquires real-time voltage, current, power, electric energy, frequency, harmonic, ripple and charging gun interface temperature key parameters of the charging pile and transmits them to the metering performance online verification module and the power quality evaluation module. The remote communication and protocol interaction module realizes two-way data interaction between the metering performance online verification module and the health state evaluation module and the operation platform through 4G / 5G network testing. The metering performance online verification module receives the data collected by the high-precision data acquisition module, verifies the metering accuracy of the AC / DC charging pile based on the real load test method and the order electric quantity comparison algorithm, and then transmits it to the data storage and traceability module. The power quality evaluation module analyzes voltage, current harmonic and ripple through discrete Fourier transform, evaluates output stability and energy efficiency deviation, and then outputs to the health state evaluation module. The temperature monitoring and early warning module triggers an overheating warning by setting a threshold value and analyzes the influence on metering by deploying gun head and gun seat temperature sensors. The health state evaluation module constructs a health index model by comprehensively considering energy efficiency, temperature and fault message data, outputs a health level and inputs it to the temperature monitoring and early warning module. The data storage and traceability module receives the data of the metering performance online verification module and the health state evaluation module, stores the full amount of data in the charging process locally, and calibrates the tester through the multi-table independent voltage and current source and the standard table. 2.The AC / DC charging pile metering performance and output power quality diagnostic system according to claim 1, characterized in that: The remote communication and protocol interaction module includes a communication layer and a business layer. The communication layer is responsible for device registration, identity authentication, command issuance and event reporting. The business layer realizes business closed loop through order electric quantity comparison, verification task execution and abnormal data upload logic. Data interaction adopts JSON and XML format packaging, combined with SSL and TLS protocols and asymmetric encryption of digital certificates of State Grid Electric Power Research Institute, to ensure consistency and tamper resistance of data transmission between management information area and Internet area. 3.The AC / DC charging pile metering performance and output power quality diagnosis system according to claim 1, characterized in that: The remote communication and protocol interaction module is connected to the protocol stack through the 4G / 5G module on the device side, simulates the registration, authentication and data reporting scene to verify the communication stability. The platform side integrates the charging pile management platform of the provincial company, simulates the order electric quantity comparison and verification task issuance business logic, and tests the encryption transmission process between the isolation devices through the power supervision service platform. Optimize protocol latency and encryption efficiency, improve the disconnect and reconnect mechanism, and deploy it to typical charging stations for demonstration application. 4.The AC / DC charging pile metering performance and output power quality diagnostic system of claim 1, characterized in that: The metering performance online verification module verifies the metering accuracy of the AC / DC charging pile through the real load test method and the order electric quantity comparison algorithm: the DC pile compares the charging start and end time in the BMS message with the standard electric quantity accumulated by the tester and the order electric quantity generated by the charging pile operation platform, calculates the error and determines whether it is qualified according to the verification regulation, and the formula is: ， In the formula, - the difference between the indication of the electric energy at the time of stopping the charging of the tested charging station and at the time of starting the charging, kW·h, - the value of the electric energy measured by the check meter, kW·h, - the system error of the tested device, which is not corrected = 0. 5.The AC / DC charging pile metering performance and output power quality diagnostic system of claim 1, wherein: The metering performance online verification module AC pile determines the charging stage by analyzing the PWM pulse signal, determines the start and end time of the charging process in combination with the CP and PE voltage values, collects the power data of the verification instrument and the platform order for error analysis, and realizes the formula: ， In the formula, - the difference between the indication of the electric energy at the time when the tested charging pile stops charging and at the time when charging starts, kW·h; - the electric energy value measured by the calibrator, kW·h; - the calibrated systematic error of the testing device, without correction = 0; During the verification process, the GPS and Beidou clock modules built in the device ensure time synchronization with the charging pile and the platform, and the verification results are uploaded to the operation platform through remote communication to complete online metering verification under unmanned operation. 6.The AC / DC charging pile metering performance and output power quality diagnostic system of claim 1, wherein: The power quality evaluation module performs frequency spectrum analysis on the voltage and current signals output by the charging pile through discrete Fourier transform, decomposes the amplitude and phase of the fundamental wave and multiple harmonics, calculates the harmonic distortion rate and total harmonic distortion, sets the measurement parameters of bandwidth and resolution for ripple analysis, and extracts the ripple content characteristics; By comparing the differences between the voltage and current set values and the actual output values of the battery demand in the charging pile BCL message, the output efficiency deviation is evaluated, and the harmonic and ripple analysis results are combined to comprehensively judge the output stability of the charging pile. The evaluation data is uploaded to the operation platform for quality diagnosis and energy efficiency optimization. 7.The AC / DC charging pile metering performance and output power quality diagnostic system of claim 1, wherein: The temperature monitoring and early warning module monitors the temperature changes of the gun head and gun seat interface during the charging process by deploying temperature sensors on the gun head side and the gun seat side, and pre-sets the overheating warning threshold. When the monitored temperature exceeds the threshold, a warning signal is triggered and uploaded to the operation platform; At the same time, combined with the temperature change trend analysis of the charging gun contact state, the influence of temperature abnormity on the charging pile metering error is evaluated, and the platform prompts the maintenance personnel to troubleshoot and replace the charging gun. 8.The AC / DC charging pile metering performance and output power quality diagnostic system of claim 1, characterized in that: The health status evaluation module analyzes the energy efficiency data collected during the operation of the charging pile, the temperature change trend of the charging gun interface monitored by the temperature sensor, and the fault information in the CST and BMS messages, constructs a health index model, calculates the health index through adjustable weight, divides the health index into four levels according to the preset threshold, and uploads the results to the operation platform. As the basis for maintenance personnel to judge whether the charging pile needs to be maintained and replaced. 9.The AC / DC charging pile metering performance and output power quality diagnostic system of claim 1, wherein: The data storage and traceability module stores the full data of the charging process in the built-in solid state memory of the verification instrument, and uses multiple table positions independent voltage source, current source and standard table to periodically calibrate the verification instrument: In the laboratory environment, the standard signal is output by the multi-channel independent voltage and current source, the measurement value of the verification instrument is collected synchronously by the high-precision standard table, the error is compared and analyzed, and the calibration certificate is generated; Data integrity is tamper-proofed by blockchain technology and digital signature to form a complete data traceability chain.

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