摘要
该文利用线性相位复小波具有奇对称实部与偶对称虚部的特点,提出一种基于非同步采样技术的小波域正交信号分析方法,用以分离轻微电能质量扰动中包含的幅值扰动、频率扰动与相位扰动,进而确定这些扰动的幅度与类型。这种方法的显著特点是:采用具有最短平滑滤波器(Haar滤波器)的双正交复小波与只须在少数尺度上进行的移动不变小波变换;扰动幅度与小波变换系数之间存在简单的对应关系;识别扰动类型只须利用简单的二进制特征量与二-十进制转换方法。这些特点使得该方法简单、快速、准确。
An synchronous sampling quadrature signal method in wavelet-domain is presented to separate slight amplitude deviation (AD), frequency deviation (FD) and phase deviation (PD) from a complex power quality disturbance, then quantify and identify them. The method is based on the fact that a linear-phase complex wavelet is certainly with an odd real part and an even imaginary part. The distinctive characteristics of the method are: complex biorthogonal wavelet with the shortest smoothing filter (Haar filter), shift-invariant wavelet transform (WT) at a few scales, simple relationships between the WT coefficients and the magnitudes of AD, FD and PD, simple binary feature victor and binary-decimal conversion identifying process. All the above make the method simple, correct and fast.
出处
《中国电机工程学报》
EI
CSCD
北大核心
2004年第11期1-6,共6页
Proceedings of the CSEE
基金
国家自然科学基金项目(50077021)~~
关键词
正交信号
小波域
线性相位
幅度
小波变换
滤波器
频率
电力系统
复小波
幅值
Electric power engineering
Basic power quality disturbances
Complex biorthogonal wavelet
Quadrature signal in wavelet-domain
Binary features
Binary-decimal conversion identification
Asynchronous sampling.
