Application of Hilbert Vibration Decomposition in Analysis of non-stationary Oscillation Events in CSG

摘要

This paper focuses on study of time evolving dynamic of interarea oscillation modes in a realistic bulk power system – China Southern Grid (CSG). Three time-frequency methods, Ensemble Empirical Mode Decomposition (EEMD), Hilbert Vibration Decomposition (HVD) and Wavelet Transform (WT), are applied and compared in oscillation events of CSG in recent years. It is found that time varying features do exist in some oscillation events of CSG, which can be captured by HVD and WT exactly. EEMD is limited in the scenario due to mode mixing, and traditional Prony method can’t give meaningful results at all. It is proposed that HVD, WT and Prony should be complementary to each other during analyzing oscillation events in CSG.