A method and system for calibrating a DC electric energy meter based on a standard pulse virtual power source method

Abstract

The invention discloses a method and system for calibrating a DC electric energy meter based on a standard pulse virtual power source method, belonging to the technical field of electric energy measurement; the method uses a pulse virtual power source as a standard source to calibrate a measured electric energy meter; the standard pulse virtual power The source is composed of a steady-state test source, a standard table, a switch array and a controller; by controlling the dynamic error, the steady-state voltage U, the steady-state current I and the time t on The accurate value of electric energy can be obtained by measuring; by controlling the standard pulse virtual power source to simulate dynamically changing load and high-frequency ripple current, the measurement accuracy of the electric energy meter under changing load conditions can be tested. The pulse virtual power output by the invention realizes traceability of the value, can be used as a standard source method to realize the calibration of the electric energy meter, and comprehensively and accurately evaluate the electric energy measurement performance of the direct current electric energy meter.

Description

technical field [0001] The invention belongs to the technical field of electric energy measurement, relates to the technical field of DC electric energy meter verification for electric vehicle charging piles, in particular to a method and system for calibrating a direct current electric energy meter based on a standard pulse imaginary power source method. Background technique [0002] As an important part of the new energy strategy, electric vehicles are developing rapidly. According to the characteristics of the on-board batteries used in electric vehicles, large and medium-sized electric vehicles generally use DC charging. Since the DC voltage during charging is 400-800V and the current is 0-500A, the original DC electric energy meters on the market cannot meet the needs of charging pile electric energy metering functionally. If the AC side is used to measure electric energy with an AC energy meter, the power loss during rectification will be counted on the user side, whi...

AI Technical Summary

Problems solved by technology

[0004] First, the entire charging process of a battery or supercapacitor is a process of constantly changing power rather than a steady state, so the current method based on steady-state power verification is not suitable for these occasions where power changes

[0005] Second, the current DC watt-hour meter does not calculate the loss caused by high-frequency ripple current in principle, and the verification method of the watt-hour meter does not involve the measurement of high-frequency ripple power; Its internal resistance will increase significantly, so that the power dissipation caused by the current ripple cannot be ignored

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