Fast Fourier transform (FFT) is the main algorithm for harmonic analysis in electric power system, but when there is the decaying DC component in input signal, FFT algorithm will have higher error.

快速傅里叶变换(FFT)是电力系统进行谐波分析的主要算法，但当输入信号中含有衰减直流分量时，FFT算法会产生较大的误差。

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Basic theory of spectrum analysis and Fast Fourier Transform (FFT) algorithm are briefly introduced.

简介了频谱分析的基础理论和快速傅利叶变换(FFT)算法。

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One is the fast Fourier transform (FFT) accelerated algorithm.

一种是快速傅立叶变换(FFT)加速算法。

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