Synchrophasor measurement based damping estimation and oscillation mode detection using FFT-CWT approach in Japan campus WAMS

Author(s): Khairudina,b, Yaser Qudaiha, Masayuki Watanabea, and Yasunori Mitaniaa
a Kyushu Institute of Technology, 1-1 Sensuicho, Kitakyushu 804-0015, Japan
b Lampung University, Jl. Prof. S. Brojonegoro No. 1, Bandar Lampung 35145, Indonesia
International Journal of Smart Grid and Clean Energy, vol. 4, no. 2, April 2015: pp. 93-102
ISSN: 2315-4462 (Print)
ISSN: 2373-3594 (Online)
Digital Object Identifier: 10.12720/sgce.4.2.93-102

Abstract: The low voltage level synchrophasor measurement data are investigated to estimate the damping ratio and to detect any oscillation mode using Fast Fourier Transform (FFT) and Continuous Wavelet Transform (CWT). Complex Morlet (CM) is selected as a mother wavelet function considering its ability to reveal time and frequency localization simultaneously. A Two Area Four Machine System (TAFMS) model is elaborated using the Power System Analysis Toolbox (PSAT) and the FFT-CWT approach to convince the validity of the proposed method by comparing the two results. Finally, Phasor Measurement Unit (PMU) data from Japan Campus WAMS at some disturbances are evaluated.

Keywords: PMU, PSAT, FFT, CWT, damping ratio, oscil-lation mode, complex morlet function, small signal stability, two area four machine system
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