快速傅立叶变换存在较大的误差, 无法直接用于电力

系统谐波分析。本文对 FFT 的泄漏误差进行了分析, 根据

Jain 和Grandke 提出的插值算法提出了多项余弦窗插值的

新算法, 对 FFT 的结果进行修正, 极大地提高了计算精度,

使之适用于电力系统的准确谐波分析。 文中给出了该算法进

行谐波分析模拟计算的算例, 计算结果表明, 不同的加窗算

法计算精度不同, 新算法的计算精度显著提高-Fast Fourier transform is a larger error, cannot be directly used for electric power

The system harmonic analysis. Error is analyzed in this paper, the leakage of FFT, according to

Jain and Grandke interpolation algorithm proposed a number of cosine window interpolation

The new algorithm, to modify the result of the FFT, greatly improve the calculation accuracy,

Make it suitable for the accurate harmonic analysis of power system. The algorithm are also given in this paper

Simulation examples of harmonic analysis, the results show that different window to calculate

Method of calculation accuracy is different, the calculation precision of the new algorithm improved significantly