希尔伯特-黄变换在电力谐波分析中的应用研究

Application Research of HHT in Harmonic Analysis of Power System

重点研究了希尔伯特-黄变换(HHT)在电力谐波分析中的应用。针对现有的电力谐波分析方法FFT和小波变换的缺点和不足,将希尔伯特-黄变换(HHT)应用于电力谐波分析中,并且针对希尔伯特-黄变换中能导致分析精度降低的曲线拟合、端点效应和虚假分量问题进行分析和研究,采用埃尔米特插值进行曲线拟合,点对称延拓的方法抑制端点效应,并将FFT引入EMD分解终止条件中,再结合相关系数法消除虚假分量从而提高分析结果的精度。最后,仿真结果验证了改进算法的准确性和有效性。

The applications of Hilbert-Huang Transform（HHT） in harmonic analysis of power system are focused in this paper.For shortcomings and deficiencies of FFT and wavelet transform,Hilbert-Huang Transform is used in power harmonic analysis.Hermite interpolation is used for the curve-fitting.To restrain the end effect,the point-symmetric boundary extension is employed.Furthermore,in order to eliminate illusive component,the FFT is proposed to be termination conditions of the IMF combined with the energy ratio test method.Finally,the simulation results show the correctness of the improved HHT.