Energy measurement scheme of off-board charger suitable for virtual load verification

Abstract

Aiming at the shortcomings of the existing off-board charger energy measurement scheme, this paper proposes an off-board charger energy measurement scheme suitable for virtual load verification. By adopting the gun head measurement scheme, the voltage sampling is replaced from the pile to the gun head, avoiding the influence of the gun line voltage, and more in line with the measurement point setting requirements. Using an integrated DC power meter instead of the combined measurement scheme with the DC power meter and shunt avoids the accuracy effect caused by the heat of the shunt, which is convenient for the management of the built-in measurement instruments and meets the requirements of the seal of the verification regulations. The scheme supports the virtual load verification method, avoids the problems of large power consumption and heavy equipment in the real load verification, and improves the verification efficiency. By comparing the electricity errors of real load verification and virtual load verification, the feasibility and accuracy of the electric energy measurement scheme are verified, which has good engineering application value.