一种滤除衰减直流分量的改进傅氏算法

An Improved Fourier Algorithm for Decaying DC Component Filtration

傅里叶变换在电力系统继电保护中已广泛应用,但电力系统发生故障时,其中的衰减直流分量会影响测量的精度。在此基础上,提出了一种新的滤除衰减直流分量的方法,算法利用对交流采样序列值进行修正,剔除其中所含的非周期分量。通过算例仿真,验证了本方法的准确性。

Fourier transform has been widely used in power system protection, when power system failure. The decaying DC components will affect the accuracy of the measurement. In this paper, on the basis of the previous, a new filtering decaying DC component algorithm which uses the correct of AC sampling sequence value is proposed, excluding the non-periodic components contained therein. Through numerical simulation, the accuracy of the method is verified.