数字化电能计量中数值积分算法的误差分析

摘要

数字化变电站目前在国内发展迅猛,基于对数字化变电站关键设备——电子式互感器的研究,本文分析了最常用的数值积分算法测量电压、电流及有功功率产生误差的原因,给出了截断误差、舍入误差及同步误差的计算公式.文章结合数字化计量中电子式互感器典型的非同步采样进行了仿真,理论分析和仿真结果表明:数值积分算法只有在一定条件下,才能满足电力计量的要求.%The digital suhstation technique has obtained rapid progress at home. Based on the key primary equipment, such as electronic instrument transformer, the paper introduced the principle of numerical integration algorithm, analyzed the cause of error in the measurement of rms and active power, and gave the formulas of truncated error, rounding error and synchronous error. The paper also simulated the process of non-synchronous sampling in electronic instrument transformers. The simulation result and theoretical analysis came to the conclusion that numerical integration algorithm can satisfy the high accuracy request on certain condition.