Wavelet-Based Analysis of Power System Low-Frequency Electromechanical Oscillations

作者：Rueda Jose L^*; Juarez Carlos A; Erlich Istvan

来源：IEEE Transactions on Power Systems, 2011, 26(3): 1733-1743.

DOI：10.1109/TPWRS.2010.2104164

• Continuous wavelet transform
• electromechanical modes
• modal identification
• power system signal records
• small signal stability

This paper addresses the use of the continuous wavelet transform (CWT) in the study of power system low-frequency electromechanical oscillations (LFEOs). Based on a modified complex Morlet mother-wavelet function, an approach is proposed to exploit the relationship between system low-frequency oscillation features and the Morlet CWT of a system ringdown signal for detection of modal parameter changes as well as for modal frequency and damping computation. Also, several guidelines for selecting the center frequency and bandwidth parameters, the scaling factor and the translation factor, are proposed in order to provide reliable modal identification estimates. The efficiency of the proposed approach is confirmed by applying it to synthetic, simulated and measured signals.

• 出版日期2011-8