基于小波测位的闪变检测算法及其实现

Flicker measurement based on wavelet transform and its implementation on DSP

小波分析是分析非稳定信号的一种有效方法,是一种很好的电能质量信号的检测和分析工具。该文提出了基于快速小波变换的闪变算法,并将该算法在数字信号处理器(DSP)上实现。该算法可以准确定位闪变分量出现的位置,并从该时刻起进行快速傅立叶变换(FFT),从而得到包络信号的频率及幅值。该方法具有良好的检测闪变分量性能,并有效地节约了DSP计算快速傅立叶变换(FFT)的时间。

The wavelet transform (WT), which is a very powerful tool for analysing non-stationary signals, can effectively measure and analyse the power quality signals. This paper proposes a flicker method based on FWT and its implementation on DSP. This method can accurately find out the start time of flicker signals and use FFT to detect the frequency and amplitude of the flicker signals in the following. This method can also enhance the efficiency of FFT calculation by DSP. The project is supported by XJ Education Bounty of China Electricity Fund.