基于小波变换的电力系统谐波分析

Harmonic analysis in power system based on wavelet transform

针对越来越严重和普遍的电力系统谐波问题,将小波变换技术应用到电力系统谐波分析上。以一典型的正弦叠加谐波信号为例,为了便捷高效实现谐波分析,以Matlab/Simulink为仿真平台,提出了采用Simulink模型建立谐波信号的方法,并结合小波分析工具箱对其进行小波分析。结果表明,该方法能将不同频率的信号分解到不同频率范围的频带中去,有效地分离出信号中的基波与谐波分量,进而为电力系统的谐波检测与补偿提供理论依据。

Aiming at the harmonic problem that is more and more serious to power system, the technology of wavelet transform was investigated on harmonic analysis in power system. Taking a typical signal of sum of sine for example, in order to conveniently and rapidly achieve harmonic analysis, combining with Wavelet Toolbox, the method of modeling which based on Matlab/Simulink was presented. The experimental results show that the signal with different frequencies can be separated from the sampled signal, so that it can decompose the signal to fundamental wave and higher harmonic waves and provide the theory reference of the harmonic detection.