小波变换在电压闪变分析中的应用及其DSP实现

Wavelet-Based Method for Voltage Flicker Analysis and the Realization of DSP

傅立叶变换不具有时频分析能力,对含有短时高频分量和长时间低频分量的电能质量信号进行分析时具有局限性.基于小波变换具有良好的时频局部化特性析,提出一种更为有效的电压闪变分析方法.利用小波变换的多分辨率分析方法,对电压闪变信号进行检波与分解,提取出电压波动信号的频率和幅值,从而得出反映电压闪变的参数.仿真实验证明:对比傅立叶变换,小波变换是一种更为有效的电压闪变分析方法.最后提出了小波变换在数字信号处理中的实现方法.

Being incapable of time-frequency analysis and having other inherent defects, Fourier transform can't attain qualified accuracy in voltage flicker analysis. This paper put forward a wavelet-based method for voltage flicker analysis by taking the advantages of multi-resolution analysis to examine weight of amplitude modulation in voltage flicker.The method proved to be highly effective compared with that of Fourier transform. The realization of DSP is also presented.