基于小波变换的电力系统谐波分析研究

近年来随着电力电子技术的发展工业中非线性负载的不断增加,电力系统中的谐波畸变问题日趋严重,因此检测、分析和抑制谐波已经成为电力系统环境治理的重要课题。本文阐述了谐波和小波变换的基本原理并利用小波变换对电网中的谐波进行了检测、分析,并通过Matlab进行了仿真,最后用无源滤波器对谐波进行治理。仿真及实验结果表明,利用小波变换可以将信号中不同频率的谐波有效地提取出来,并进行有针对性的分析,具有更高的分析精度和更好的分析效果。

Researching of Power System Harmonic Analysis Based on Wavelet Theory

In recent years, as the development of the power electronic technology the nonlinear load of the industry is increasing day by day. The harmonic distortion of the power system is getting more and more serious. So measurement, analysis, and restraining the harmonic of power system has become an important topic for the environmental management of the power system. This paper expounds the basic principle of the harmonic and wavelet transform and it will use the wavelet transform and the Matlab simulation to test and analyse the harmonic in the power grid and treat the harmonic with the passive filter. The simulation results show that, the wavelet transform can extract the harmonic in different frequency from the signal effectively and make the analysis of the harmonic pertinency, it will also prove that analysis the harmonic in the power grid by the wavelet transform has higher analysis precision and better results.