智能变电站电能计量中非整周期采样的误差分析与补偿

摘要

With the development of smart substation, digital electric energy meter is widely applied. Because of the grid frequency fluctuation and other reasons, the spectrum leakage error brought by current and voltage non-integer period sampling is much bigger, affecting the accuracy of energy metering. This paper mainly ana-lyzes the spectrum leakage error in the process of energy metering, which uses zero-crossing check to calculate the real-time frequency and proposes the method of non-integer period sampling error compensation. Then Mat-lab simulation is used to test the compensation effect, and the simulation data shows that the method is simple, effective and provides basis for metering accuracy of electric energy meter.%随着智能变电站的发展，数字化电能表的应用越来越广泛。由于电网频率波动等原因，电压、电流信号的非整周期采样引入的频谱泄露误差较大，影响电能量的准确计量。分析了数字化电能表电能计量过程中引入的频谱泄露误差，采用过零检测计算实时频率，提出非整周期采样误差补偿方法。通过Matlab仿真验证其补偿效果，仿真数据表明该方法简单、有效，为电能量的准确计量提供了依据。