基于尺度滤波与小波去噪的PID继电整定

针对PID参数继电整定法存在继电环节对噪声敏感和受噪声污染的输出波形无法提取出特征参数等缺陷,提出一种利用小波技术的解决方法.该方法以尺度函数为低通滤波器在线滤除反馈信号中的高频干扰,并用小波阈值去噪法离线去除输出波形中的噪声,恢复真实波形以提取出精确的特征参数.从理论上证明了尺度滤波与小波去噪的正确性,并给出了实用算法.仿真实例验证了该方法的有效性.

Relay Auto-turning for PID Control Based on Scale Filter and Wavelet Denoising

Aiming at that the relay is sensitive to noises and extracting characteristic parameters from system output values polluted by noises is hard, one approach is proposed to solve the problems based on wavelet technology. Scale function is regarded as low-pass filter to eliminate noises online from feedback signal, and denoising of output wave-forms offline is done using wavelet thresholding to extract characteristic parameters easily. The validity of scale filter and wavelet denoising is proved theoretically, and practical algorithm is presented. The simulation shows that the method is effective.