摘要
为了保证微机保护的速动性,大部分微机保护的信号采集装置利用DFT来实现傅氏算法的系数求解。本文由连续信号的频域出发,推导出了基于DFT的傅氏算法离散信号频率特性。通过对该频率特性的研究,既给出了基于DFT的傅氏算法在微机保护中的理论依据,又得到了基于傅立叶算法应用的必要条件。并在最后简要的介绍了某种剔除信号中衰减直流分量的算法。
In order to ensure the rapidness of microprocessor- based protection relays, most data-acquisition devices in microprocessor-based protection relays utilize DFT to figure out the coefficients of Fourier-Series. Starting with an analysis in the frequency domain of continuous signal, this paper deduces the frequency character of discrete signal within Fourier algorithm based on DFT. The research on this frequency character not only gives us the theoretical essence of Fourier algorithm based on DFT in microprocessor-based protection, but also shows us the necessary conditions of the applications based on Fourier algorithms. Finally, the paper briefly introduces an algorithm which could eliminate the decaying DC component in the signal.
出处
《山东电力高等专科学校学报》
2008年第4期32-36,共5页
Journal of Shandong Electric Power College
关键词
微机保护
DFT
傅氏算法
频率特性
microprocessor-based protection relay
DFT
Fourier algorithm
frequency character
