基于Symlet小波的电力系统谐波检测与治理

Power system harmonic detection and restraining based on Symlet wavelet

随着电力电子技术的发展,工业中电力非线性负载的不断增加,对电网中的谐波进行检测与治理已成为电力系统的研究热点.为此,在分析小波基的选择、分解尺度和层数的确定、频带的划分等关键问题基础上,提出基于Symlet小波对电网谐波进行检测的方法和理论,并应用滤波器技术对电网谐波进行治理.仿真及实验结果表明,利用Symlet小波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.

In recent years,the nonlinear load of the power grid is increasing day by day with the development of the power electronic technology,and how to detect,analyze,and restrain the harmonic of power system has become an important research topic for power system.Based on the research of wavelet function selection,scaling function,frequency band,and other key techniques,this paper presented a novel power harmonic detection method using Symlet wavelet,and discussed the harmonic restraining techniques through passive filters.Simulations and experimnts showed that Symlet 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.