南方电网技术2026，Vol.20Issue(2)：87-96,10.DOI:10.13648/j.cnki.issn1674-0629.2026.02.009
高压强磁环境下电气信号的小波分频降噪方法
Wavelet Frequency Division Method for Noise Reduction of Electrical Signals in High Voltage and Strong Magnetic Field Environments
摘要
Abstract
Noise and various disturbances in the high voltage and strong magneticfield environment directly impact the accurate detec-tion of electrical signals,as well as interfere with the time-frequency characteristics of these signals.To mitigate noise and disturbance components,an adaptive noise reduction method is proposed based on wavelet frequency division threshold and frequency division threshold function.Firstly,following wavelet packet decomposition of the signal,the node coefficients from the final two layers of the wavelet packet tree are arranged in order of frequency magnitude,and the node coefficient thresholds for differ-ent frequency bands(frequency division thresholds)are estimated.Secondly,the noise reduction adjustment coefficient is constructed by the ratio of energy of adjacent layer node coefficients,and the frequency division threshold is adaptively optimized.Subsequently,an improved threshold function(frequency division threshold function)is constructed by incorporating the benefits of both soft and hard thresholds,utilizing the noise reduction adjustment coefficient to achieve adaptive adjustment of threshold functions of different nodes.Finally,the denoised signal is obtained by reconstructing the wavelet packet tree.Simulink simulation and noise reduction results of the measured recorded waveform signal under high-voltage strong magnetism show that the method can effectively remove some effects,such as spikes,burrs,etc.The noise reduction effect is significant and the signal waveform restoration is excellent.The method holds certain application value in electrical signal detection.关键词
频率排序/降噪方法/小波包原理/谐波扰动/能量比Key words
frequency sorting/noise reduction method/wavelet packet principle/harmonic disturbance/energy ratio分类
信息技术与安全科学引用本文复制引用
陈朝晖,袁康健,丁晓兵,陈旭,汤涛,刘玮..高压强磁环境下电气信号的小波分频降噪方法[J].南方电网技术,2026,20(2):87-96,10.基金项目
国家自然科学基金资助项目(52207075) （52207075）
中国南方电网有限责任公司科技项目(ZDKJXM20220004). Supported by the National Natural Science Foundation of China(52207075) （ZDKJXM20220004）
the Science and Technology Project of China Southern Power Grid Co.,Ltd.(ZDKJXM20220004). （ZDKJXM20220004）
