Method of Power Quality Detection De-noising Based on Wiener Filtering
基于维纳滤波的电能质量检测去噪算法*

Mean filter is sensitive to brake points.The parameters of the traditional adaptive Wiener filter are estimated from neighborhood.Because of the limit of the neighborhood,the problem of the estimation accuracy arises.Aimed to resolve the problem,this paper presented a new de-noising method of power quality detection.The method cut down the influence of the noises to the estimate of the parameter of Wiener filtering by meaning filtering first.To keep the brake points,thresh filtering was operated on the result of the Wiener filtering.Experiment indicates that this method not only de-noise well but also keep the brake point nicely.