摘要
提出一种基于瞬时无功功率理论和小波变换相结合对电能质量进行检测辨识的方法。首先利用瞬时无功功率理论对各种电能质量信号进行变换，检测出扰动的起止时刻，并将在幅值上有显著特征的电能质量扰动信号识别出来；再利用小波变换对突变信号的敏感性以及在频率分解中的特性将其余信号检测识别出来。计算结果表明该方法简单．检测精度较高。
Power quality disturbances are often encountered in the field of power quality research. This paper proposes a method for detecting and classifying power quality by means of wavelet transformation and instantaneous reactive power theory. Firstly, the beginning and end times can be detected through the power quality signals transformed by instantaneous reactive power theory, then power quality disturbance signals with outstanding features in multitude can be identified, the other signals then can be further identified by using the sensitivity of wavelet transform to sudden-change signals and its features in frequency dissolution. The calculation results indicate that this method is easy and simple yet with high precision.
作者
张萍
魏磊
徐卓
ZHANG Ping,WEI Lei,XU Zhuo （1.Xi＇an Electric Power Supply Bureau, Xi＇an 710032 China; 2. Northwest Electric Power Design Institute,Xi＇an 710032, China; 3.Qingdao Iron Steel Group, Ltd., Qingdao 266043, Shandong Province, China）
关键词
瞬时无功功率
小波变换
分类与识别
电能质量扰动
instantaneous reactive power
wavelet transform
classify and identification
power quality disturbance
