A Full- and Half-Cycle DFT-based technique for fault current filtering

C. Yu, Yisheng Huang, Joe-Air Jiang
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引用次数: 32

Abstract

Decaying DC components in fault currents will make the digital filter to obtain inaccurate phasors and cause the false operations of a relay system. Many studies have put their focuses for removing the decaying DC components from fault currents. Generally, they need extra samples or phasors to obtain the parameters of the decaying DC component. In order to accelerate the filter response, this paper presents a new Discrete Fourier Transform (DFT)-based algorithm which does not need extra sample to remove the decaying DC component. To achieve this, the samples used for a traditional DFT computation are split to four groups. Both the Full-Cycle DFT (FCDFT) and the Half-Cycle DFT (HCDFT) -based computations have been developed in this paper. The proposed algorithm is evaluated by MATLAB/SIMULINK generated data to show its effectiveness.
基于全半周dft的故障电流滤波技术
故障电流中直流分量的衰减会使数字滤波器获得不准确的相量,导致继电系统误动作。许多研究都把重点放在从故障电流中去除衰减的直流分量上。通常,他们需要额外的采样或相量来获得衰减直流元件的参数。为了加快滤波器的响应速度,本文提出了一种新的基于离散傅立叶变换(DFT)的算法,该算法不需要额外的采样来去除衰减的直流分量。为了实现这一点,用于传统DFT计算的样本被分成四组。本文提出了基于全周期DFT (FCDFT)和半周期DFT (HCDFT)的计算方法。通过MATLAB/SIMULINK生成的数据对该算法进行了验证。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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