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    A non-stationary analysis of low-frequency electromechanical oscillations based on a refined margenau-hill distribution

    , Article IEEE Transactions on Power Systems ; Volume 31, Issue 2 , 2016 , Pages 1567-1578 ; 08858950 (ISSN) Hatami, M ; Farrokhifard, M ; Parniani, M ; Sharif University of Technology
    Institute of Electrical and Electronics Engineers Inc 
    This paper focuses on the use of quadratic time-frequency distributions (QTFDs) to characterize the temporal variation of low-frequency electromechanical oscillations (LFEOs) using ringdown data. A refined Margenau-Hill distribution (MHD) and a procedure to extract the instantaneous frequencies and damping factors as well as initial phase angles of system low-frequency modes when the analyzed signal is multi-component are proposed. The refinement process enjoys a fast-converging iterative algorithm and without loss of generality it can be applied to other QTFDs for using in other applications. A non-stationary synthetic signal as well as simulated ringdown data of a 5-area, 16-machine power...