摘要
传统 2带小波变换在高频载波信息中提取暂态成分的应用中存在局限性 ,M带小波变换弥补了这一缺陷。在探讨M带小波基的构造条件的基础上 ,研究了一种基于余弦调制完全重构滤波器组的M带小波基的构造方法 ,仿真分析了局部放电暂态信号的 6带小波变换的特点 。
The traditional wavelet transform has some limitations in analyzing transient signals, which are accompanied by high frequency carriers. These limitations can be overcome by M band wavelet transform. The construction conditions of M band wavelet base are discussed. Then, a new M band wavelet base construction method based on cosine modulated perfect reconstructing filter group is proposed. A 6 band wavelet base is constructed, its time and frequency characteristics are studied, and the local discharge transient signals are analyzed. The wavelet transform results of the transient indicate the advantages of the proposed method.
出处
《西南交通大学学报》
EI
CSCD
北大核心
2001年第3期276-280,共5页
Journal of Southwest Jiaotong University
基金
国家自然科学基金项目资助 !(5 99770 19)
关键词
故障检测
电力系统
计算
调制
小波变换
fault detection
power system computation
modulation
wavelet transforms