直流纹波对直流电能表的影响分析

Analysis on Influence of Direct Current Ripple Wave on Direct Current Electric Energy Meter

对直流电能的测量,方法一是使用一个直流电压表和一个直流电流表分别测量其有效值,然后两者相乘得出其直流功率后计算电能值;方法二是对电压和电流同步采样,使用瞬时功率积分计算电能值。由于直流信号叠加了纹波信号,通过理论分析和设计仿真,分析直流纹波对这两种方法测量误差的影响,为直流溯源和直流测量提供理论参考。

For measuring direct current （DC）electric energy,one method is to use a DC voltage meter and a DC current me-ter to measure its effective values respectively and then work out the electric energy value after multiplying the two effective values and getting its DC power. Another method is to carry on synchronous sampling for voltage and current and use instan-taneous power integration to calculate the electric energy value. Because DC signals overlay ripple signals,it is able to ana-lyze influence by DC ripple wave on measuring errors by means of theoretical analysis and design simulation which may pro-vide theoretical reference for DC tracing to the source and DC measuring.