Low Frequency Oscillation Type Discrimination Based on Initial Oscillation Waveform Data and Coherence Method

doi:10.3969/j.issn.1000－7229.2016.10.015

Abstract

Abstract: According to the different excitations, the main low frequency oscillation of power system is forced oscillation and negative damping oscillation. The two kinds of oscillations are similar in form, but the control methods are quite different. We summarize the external characteristic and distinction of the two kinds of oscillations based on the deep analysis on the analytical expression of active power oscillation of power system, then put forward a oscillation type identification method on the basis of coherence method. Firstly, this method obtains two sets of initial data of oscillation which contains the noise through the wide area measurement system (WAMS) installed on the different generators, then calculates the magnitude squared coherence of the two sets of data based on coherence method. So we can identify the oscillation type by the comparison of the magnitude squared coherence. The simulation calculation and analysis of four-machine, two-area system verify the feasibility and effectiveness of the proposed identification methods.

Key words: power system, low frequency oscillation, forced power oscillation, negative damping oscillation, coherence method

CLC Number:

TM 712

WANG Lixin, CAI Guowei, YANG Deyou, SUN Zhenglong. Low Frequency Oscillation Type Discrimination Based on Initial Oscillation Waveform Data and Coherence Method[J]. Electric Power Construction, 2016, 37(10): 108-.

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