基于小波变换和快速傅立叶变换的电网谐波分析

Harmonic Analysis of Power Grid Based on Wavelet Transform and Fast Fourier Transform

谐波分析是谐波治理和研究谐波问题的基础。文中介绍了一种将小波变换和快速傅立叶变换结合起来的谐波分析方法,给出了电能质量信号突变点的确定公式,并对三相全控桥式整流电路产生的谐波电流进行仿真分析,得出了采用这种方法能够分别检测出扰动信号的起止时刻,也能够分析各次谐波的幅值和相角的结论。

Harmonic analysis is the basis of harmonic researching and solving. This paper proposes a new algorithm for the analysis of harmonic in power system based on the combination of wavelet transform and fast fourier transform, gives the formula of power quality disturbing signals detection and location. Harmonic current from is simulated and the simulation results show that the proposed methods can be used to locate disturbing signals and analyze harmonic spectrum component.