1. A Non-Stationary Analysis of Low-Frequency Electromechanical Oscillations Based on a Refined Margenau-Hill Distribution.
- Author
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Hatami, Mohammadreza, Farrokhifard, Mohammadreza, and Parniani, Mostafa
- Subjects
MATHEMATICAL models ,ELECTRIC power systems ,OSCILLATIONS ,ELECTROMECHANICAL effects ,ITERATIVE methods (Mathematics) ,DISTRIBUTION (Probability theory) ,SIGNAL processing - Abstract
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 system and real measured data of Western Systems Coordinating Council (WSCC) system are used to demonstrate the efficiency of the proposed method in the presence of measurement noise. [ABSTRACT FROM AUTHOR]
- Published
- 2016
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