基于小波的畸变波形同步分层谐波阻抗估计  

Assessing harmonic impedance by synchronously delaminated distortion waves based on wavelet

作　　者：蒋文林[1,2] 郭玉恒[3] 薛东江 郭新年 

机构地区：[1]西南交通大学电气工程学院 [2]攀枝花学院电气信息工程系,四川攀枝花617000 [3]二滩水电站 [4]攀枝花学院电气信息工程系

出　　处：《电力自动化设备》2005年第2期33-36,共4页Electric Power Automation Equipment

摘　　要：针对电力系统中非线性负荷所产生的谐波电流特点,提出应用小波变换处理电能质量扰动信号,突出畸变信号以进行谐波阻抗估计,克服了傅里叶变换无法进行时-频局部化分析的缺陷,提取出局部时间范围内所需频带信号。介绍了其基本原理,以及小波分析窗口的选择和波动量的计算。应用Matlab建立电路模型进行仿真,结果表明该方法提高了系统谐波阻抗估计值的幅值精度。According to the characteristics of harmonic current caused by nonlinear load of power system,an approach to harmonic impedance assessment is proposed,which applies wavelet transform to process the disturbance signal of power quality and emphasizes the distorted signals. It over-comes the limitation of Fourier transform in time-frequency localizing analysis and obtains the signals of required frequency band. Its principle is introduced,and the wavelet window selection and distortion quantity calculation are detailed. The circuit model is established with Matlab. Results show that the proposed method helps to improve the amplitude accuracy of system harmonic impedance assessment.

关 键 词：谐波阻抗 小波变换 畸变信号 同步分层 

分 类 号：TM74[电气工程—电力系统及自动化]