HHT在电力系统低频振荡模态参数提取中的应用.pdfVIP

27 28 Vol.27 No.28 Oct. 2007 2007 10 Proceedings of the CSEE ©2007 Chin.Soc.for Elec.Eng. 0258-8013 (2007) 28-0079-05 TM711 TM76 A 470 40 ⋅ HHT ( 132012) Application of HHT for Extracting Model Parameters of Low Frequency Oscillations in Power Systems LI Tian-yun, XIE Jia-an, ZHANG Fang-yan, LI Xiao-chen (Institute of Electrical Engineering, Northeast Dianli University, Jilin 132012, Jilin Province, China) ABSTRACT: In order to obtain reasonable and precise results in analyzing low frequency oscillation (LFO) in power systems, a novel method based on Hilbert-Huang transform (HHT) was introduced to extract the model parameters of LFO. It applied [1-4] [5-6] empirical model decomposition (EMD) to decompose the LFO signals and calculated the instantaneous parameters including magnitude, frequency and phase of every model component with Hilbert transformation, and then calculated the damping ratio of every model component based on above parameters and derived the formulas. Thus it realized effective extraction of all (PSS) parameters of LFO signals and put forward a new explanation of [1] the mechanism of very low frequency oscillation. This method can be applied to analyze strong non-linear oscillation models in