小波分析在高次谐波抑制上的应用研究

The Application of Wavelet Analysis in Restraining Higher Harmonic

随着非线性负荷的不断增加,电力系统的谐波含量日益增加。多分辨分析思想作为小波分析的重要理论,在谐波治理中的发挥着重要作用。从小波分析入手,通过分析多分辨分析的特性,找到了多分辨分析与谐波治理的切入点。利用多分辨分析思想,将原始信号分解为高频信号和低频信号,并且将原始信号中的高次谐波直接滤除,实现了对某个高次谐波区间或某次谐波的直接抑制或提取。算例结果表明,该方法应用在谐波抑制中是有效的、可行的。

Growing in non-linear loads, so harmonic content is increased. Multi resolution analysis （MRA） is the important base of the wavelet analysis, and is the major function in harmonic treatment. The paper uses wavelet analysis to note the character of multi resolution analysis, and finds the breakthrough point between the MRA and harmonic treatment. Then the paper uses multi-resolution analysis to decompose the primitive signal to high frequency signal and the low frequency signal and filter the higher harmonic directly,and has come trueand to restrain and draw the specially harmonic block. The example results show this way of harmonic treatment is practicable and available.