电测与仪表2012，Vol.49Issue(5)：65-70,6.
基于EMD的WVD分布方法在电力系统低频振荡监测中的应用
Wigner-ville Distribution Based on EMD Analysis of Power System Low-frequency Monitoring and Its Application
摘要
Abstract
In order to analyze low frequency oscillation of power system, this paper introduces a novel Wigner-Ville distribution (WVD) method based on EMD (Empirical Mode Decomposition), which is proposed to deal with non-stationary signal in the analysis of power system low frequency oscillations. The WVD method based on EMD can analyze local dynamic behavior and characteristics of nonlinear and non-stationary signals, get the oscillation mode parameters such as amplitude, frequency, damping ratio, phase, the time of starting and ending. It can reflect the time-varying behaviors of multi modes involved in oscillation process as well as their mutual influences better. Furthermore, the proposed method has the advantages such as high resolution and requiring short period of sample data, which can improve the identification capability and signal processing effect. Several experiments have validated the method; experimental results show that the method can identify the oscillation characteristics more accurately.关键词
电力系统/低频振荡/非平稳信号/经验模态分解/维格纳-威力分布/振荡模式/信号特征/分辨率Key words
power system/ low frequency oscillation/ non-stationary signals/ EMD/ WVD/ oscillation model/ signal characteristics/ resolution分类
信息技术与安全科学引用本文复制引用
胡思,黄琦,井实,易建波..基于EMD的WVD分布方法在电力系统低频振荡监测中的应用[J].电测与仪表,2012,49(5):65-70,6.基金项目
教育部新世纪优秀人才支持计划资助项目(NCET-09-0262) （NCET-09-0262）
