基于小波包变换的电力谐波检测研究

提出了一种基于小波包变换的电力谐波检测方法。该方法采用小波包变换对电流信号进行分解,即将该电流信号分解成低频部分与高频部分,然后分别对低频部分及高频部分进行小波包分解,重构后得到该电流信号的基波分量,从原始电流信号中减去基波分量,从而得到该电流信号的谐波分量。仿真结果表明,该方法能够很好地检测出电流信号中的谐波分量,并且能对指定频率的谐波进行检测。

Research of Power Harmonic Detection Based on Wavelet Packet Transform

The paper proposed a detection method of power harmonic based on wavelet packet transform.The method uses wavelet packet transform to decompose current signal, namely the current signal is departed into low-frequency part and high-frequency part,then respectively makes wavelet packet decomposition for the low-frequency part and the high-frequency part and gets fundamental component of the current signal after reconstruction.The fundamental component is subtracted from the original current signal so as to get harmonic component of the current signal.The simulation result showed that the method can detect harmonic component of current signal well and can detect harmonic of certain frequency.