一种新型负序基波电流检测方法及其应用

快速、准确、实用的负序基波电流检测方法对于电能质量监测与控制、继电保护等具有极其重要的意义。通过对幅值积分信号所具有的选频特性进行分析，研究了一种负序基波提取器，在此基础上提出了一种新型的负序基波电流检测方法。基于负序基波提取器的检测方法既不需要锁相环、低通滤波器，也不需要进行αβ坐标系变换到 dq坐标系及其反变换的计算。仿真与实验结果均证明了采用该检测方法的有源滤波器具有良好的补偿性能。

A Novel Detecting Method for Negative Sequence Fundamental Current and Its Applications

For the power quality control and relay protection,it is very important of rapid,correct and practical detection of the negative sequence fundamental current.After analyzing the selective frequency characteristic of an amplitude integration signal,this paper proposes an extractor with a novel detecting method of the negative sequence fundamental current.This detecting method needs neither a phase locked loop(PLL) nor a low pass filter(LPF),and can omit some complex calculations for the coordinate transforms.Results from the simulations and experiments all verify the perfect performances of the shunt APF which employs this novel detecting method.