Extraction of the Oscillatory Parameters of Low Frequency Oscillation Based on Improved Local Mean Decomposition
Ruiqian Qu, Yong Li · Proceedings of the CSEE · 2013
A new nonlinear and non-stationary signal processing method named improved local mean decomposition was proposed to analyze the measured oscillatory signal from wide area measurement system.The measured signal was decomposed into a linear combination of a finite set of product functions(PFs) and the amplitude modulated(AM) signal,and frequency modulated(FM) signal of each PF also could be obtained.The AM signal was utilized to calculate the oscillatory amplitude and damping while the FM signal was used to determine the oscillatory frequency.The measured signals from simulation model and actual power system indicate the validity and feasibility of the proposed method.