分析电能质量扰动的实小波域修正相子法  

Haar Wavelet-Based Modified Phasor to Detect and Quantify Power Quality Disturbances

作　　者：陈祥训[1] 刘兵[1] 赵波[1] 

机构地区：[1]中国电力科学研究院,北京市海淀区100085

出　　处：《中国电机工程学报》2006年第24期37-42,共6页Proceedings of the CSEE

基　　金：国家自然科学基金项目(50577059)~~

摘　　要：电力系统基波幅值、相位、频率扰动是最基本的电能质量扰动。为快速、准确地检测、分析这些扰动,该文提出一种采用固定采样频率与Haar小波变换的修正相子法。新相子由实小波域的复信号组成,所需的小波变换只须在第1个尺度上进行。相子参数与被分析信号的幅值、相位、频率存在着简单的关系,并且可由被分析信号的3个相邻采样值简单地求得。理论分析与仿真计算表明,该文方法要求的数据窗短,计算简单,可快速、准确地检测、分析电力系统基波幅值、频率、相位的变化及变化幅度,可望在定制电力、继电保护中获得应用。Amplitude deviation, frequency deviation and phase deviation are basic power quality disturbances. To analyze these disturbances quickly and correctly we develoPed a Haar wavelet-hased modified phasor method. Haar wavelet wansform is implemented at one level as the sinusoidal voltage signal is sampled at fixed intervals. Then the new phasor is constructed from a complex signal in real wavelet-domain. Magnitude and argument of the phasor simply relate to three adjacent samples. Amplitude, frequency and phase of the sampled signal simply relate to the phasor. Short data window and light computing burden make the method fast and accurate for detecting, localizing and quantifying disturbances of amplitude, frequency and phase. Simulations demonstrated these Performances. This method may have practical application in customer power and protective relays.

关 键 词：修正相子法 定制电力 电能质量扰动 HAAR小波变换 实小波域复信号 固定采样频率 

分 类 号：O177[理学—数学] TN911[理学—基础数学]