Three-phase alternating-current charging pile testing method, device and equipment based on analog multiplier principle

Abstract

The invention discloses a three-phase alternating current charging pile testing method, device and equipment based on an analog multiplier principle. The method comprises the steps that a voltage divider resistance network and a current sensor are additionally arranged on a voltage circuit and a current circuit respectively, current and voltage signals of all phases output by a three-phase alternating current charging pile during charging of an electric automobile are collected, the voltage divider resistance network is adopted to collect voltage signals, and the current sensor is adopted to collect current signals; the active power of the three-phase alternating current charging pile is calculated by using a three-phase analog multiplier with a zero calibration function; the active powerof the three-phase AC charging pile is converted into a frequency signal through a V / F converter, the frequency signal is output, and the output pulse of the V / F converter and the pulse number of an electric energy meter in the detected charging pile are collected; an active electric energy error of the three-phase AC charging pile is calculated by using the pulse data, and zero calibration of allpaths from sensor input to V / F converter output is realized. The use difficulty of the charging pile test equipment is greatly reduced.

Description

technical field [0001] The invention relates to a three-phase AC charging pile testing method, device and equipment based on the principle of an analog multiplier, and belongs to the technical field of electric vehicle charging. Background technique [0002] Electric vehicle charging piles, like fuel dispensers, are measuring instruments used for trade settlement, and the accuracy of their measurement (billing) directly affects the economic interests of both parties to the trade. It is of great significance to carry out the legal management of measurement of electric vehicle charging piles, strengthen the measurement and supervision of charging piles, ensure the accuracy and reliability of the electric energy value of charging piles, and maintain the fairness and justice of electric energy trade settlement. [0003] There are already more than 1 million charging piles in my country, and the workload of electric energy measurement and testing of charging piles in the future w...

AI Technical Summary

Problems solved by technology

[0004]The AC charging pile calibrator and the AC charging pile load box generally adopt the AC sampling principle, the accuracy of the active energy of the equipment and the reference voltage chip inside the calibrator. The temperature coefficient is proportional to the relationship, but the long-term stability depends on the stability of the reference voltage chip and the AC sampling algorithm is complex, not only the volume is too large, the transportation is inconvenient, and the equipment is expensive

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