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。
Recently, harmonic analysis is an important area in the electric power system.
目前，电力谐波分析已经成为电力系统领域的一个重要研究方向。
Recently, harmonic analysis is an important area in the electric power system.
目前，电力谐波分析已经成为电力系统领域的一个重要研究方向。
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