摘要
作为一种非线性时变信号处理方法,希尔伯特–黄变换(Hilbert-Huang transform,HHT)已经被应用到电力系统低频振荡的分析中。分析经验模态分解(empirical mode decomposition,EMD)过程中存在的端点效应和模态混叠现象。针对EMD分解过程中的端点效应问题,通过4种端点延拓方法的比较,得出适合电力系统低频振荡信号分析的延拓方法。在介绍频率偏差法基本原理和适用范围的基础上,提出利用频率偏差法来解决EMD分解中存在的模态混叠现象,并建立基于极值点对称延拓和频率偏差原理的改进HHT算法。测试信号和仿真算例证明频率偏差法可有效地解决信号在EMD分解过程中的模态混叠现象,扩大了HHT在低频振荡信号分析中的应用范围。
As a non-linear and time-varying signal processing method, Hilbert-Huang transform （HHT） has been widely used to analyze low frequency oscillation signal in power system. The end effects and mode-mixing phenomena in the processing of empirical mode decomposition （EMD） were introduced. Aiming at the end effect phenomenon in processing of EMD, the extension method which is appropriate to deal with low frequency signal was got by comparing four different kinds of extension methods. In order to overcome the mode-mixing problem, the frequency heterodyne technique was proposed based on analysis of its principle and applying condition. And then the improvement HHT was presented based on frequency heterodyne technique and wide area measurement system （WAMS）. The results of testing signal and simulation model show that improvement HHT is feasible and effective to overcome special modemixing problem and the application of HHT is extended.
出处
《中国电机工程学报》
EI
CSCD
北大核心
2011年第10期102-108,共7页
Proceedings of the CSEE
关键词
电力系统
希尔伯特黄变换
端点延拓
频率偏差法
频差因子
瞬时参数
power system
Hilbert-Huang transform （HHT）
end extension
frequency heterodyne
frequency shifting factor
instantaneous parameter
作者简介
杨德昌（1983），男，博士研究生，主要研究方向为交直流互联电力系统的广域监测和稳定控制、广域测量系统在智能电网中的应用，dechang．yang@tu-dortmund．de；
C．Rehtanz（1968），男，教授，博士生导师，主要从事大电网稳定控制与安全评估、HVDC和FACTS控制技术、电力系统广域监视、控制与保护以及智能电网方面的研究工作，Christian．Rehtanz@tu-dortmund.de。
