Research on the Measurement error of Electric Energy Metering System under Harmonics

Abstract

Electric energy metering system consists of watt-hour meter, voltage transformer and current transformer. Hence, the error of electric energy metering system should be analyzed from the three parts. Aiming at the measurement accuracy of the power metering system under harmonics, the equivalent circuits of electronic watt-hour meter, capacitive voltage transformer and magnetic current transformer under harmonic conditions are built, and the harmonic measurement/metering error and the influencing factors are analyzed. The model of electric energy metering system is set up to analyze its error under harmonic conditions. This article provides a theoretical basis for the quantitative analysis of measurement error of the energy metering system under harmonics.

An Energy Measurement Method of Electric Vehicle Based on FFT and Wavelet Transform

“…However, Electric vehicle battery charging is a nonlinear capacitive load, the load distribution is rather random, and load power factor is low [1], [2]. In addition, the complexity of the charging process will produce shock load, nonlinear load and transient harmonics [3], and bring harmonic pollution and electric energy measurement error.…”