动态电能质量扰动的多刻度形态学分析  

MULTISCALE MORPHOLOGYANALYSIS OF DYNAMIC POWER QUALITY DISTURBANCES

作　　者：束洪春[1] 王晶[1] 陈学允[2] 

机构地区：[1]昆明理工大学电力学院,云南昆明650051 [2]哈尔滨工业大学电气工程系,黑龙江哈尔滨150001

出　　处：《中国电机工程学报》2004年第4期63-67,共5页Proceedings of the CSEE

基　　金：云南省科技攻关项目(2003GG10; 2000B2-02); 省应用基础研究项目(98E0409M; 99E006G; 2002E0025); 云南省中青年学术和技术带头人培养经费项目。

摘　　要：利用多刻度数学形态学由粗到细地对信号进行分层处理的特点,从动态电能质量扰动的波形出发,建立一种全新的多层次描述和多层次处理的扰动辨识方法。该方法不以传统的基于有效值理论的波形分析和基于稳态信号的频谱分析为辨识依据,而是直接从波形的几何形态出发,采用不同刻度的结构元素对波形进行变换,通过形态学膨胀、腐蚀、开、闭运算,得到各刻度下的形态谱并获得对所研究对象的直观的理解。仿真结果证明该方法弥补了傅立叶变换和小波变换的一些缺陷;适当选择结构函数的幅值和信号采样率后,分析结果只受结构函数形状的影响。为动态电能质量扰动的检测、识别与分类提供了新的思路。Based on the characteristic of multiscale Mathematical Morphology (MM) in analyzing signals from rough to fine, a totally novel multi-level description and multi-level process method for disturbance identification, is established. The proposed method is neither according to RMS analysis, nor according to frequency-spectrum analysis of stable signal. Instead, structuring function under different scales is used to transform the signal. After the erosion, dilation, opening and closing operations, an in-depth comprehension of the studied object, following the relative pattern spectrum, is obtained. Simulation results show the method mentioned overcomes the disadvantages of Fourier transform and Wavelet transform. Meanwhile, by proper selecting the amplitude of structuring function and signal sample frequency, analysis result is affected by the structuring function shape only. The multiscale morphology analysis method gives a new ideal for dynamic power quality detection, identification and classification.

关 键 词：电力系统 多刻度形态学分析 动态电能质量 小波变换 暂态信号 

分 类 号：TM711[电气工程—电力系统及自动化]