中南大学学报（自然科学版）2011，Vol.42Issue(4)：1043-1049,7.
复小波变换-自适应滤波算法抑制局部放电窄带干扰
Complex wavelet transform-adaptive filter algorithm in suppressing PD's narrow bandwidth noise
摘要
Abstract
Because there are too many different interference frequencies and low signal-noise-ratio(δ) in suppressing partial dischange's narrow bandwidth noise, an algorithm of complex wavelet transform-adaptive filter was proposed.First, the signals were decomposed into different bands with the property of frequency domain division of complex wavelet transform, which can reduce the number of interferences in each band. Secondly, the adaptive filter level-by-level was adopted. Finally, a new combining information was utilized to greatly enhance the ability of extracting PD signals from large noise and the maintenance of signal's waveform. The results show that results of signal to noise ratio δ=22.22,16.16, 17.16, 21.75 as well as wave form similarity η=0.909 2, 0.9427, 0.668 8, 0.657 0 can be achieved when original signal to noise ratio δ0=0, which shows great improvement compared with traditional adaptive filtering.关键词
局部放电/窄带干扰/复小波变换-自适应滤波/复合信息Key words
partial discharge/ narrow bandwidth noise/ complex wavelet transform-adaptive filter/ combining information分类
信息技术与安全科学引用本文复制引用
盛驰,曹建,丁家峰,何腾波..复小波变换-自适应滤波算法抑制局部放电窄带干扰[J].中南大学学报（自然科学版）,2011,42(4):1043-1049,7.基金项目
国家自然科学基金资助项目(50277039) （50277039）
