The Transactions of The Korean Institute of Electrical Engineers (전기학회논문지)

The Korean Institute of Electrical Engineers (대한전기학회)
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Fast Estimation of Low Frequency Parameter for Real-Time Analysis in Wide Area Systems

광역계통의 실시간해석을 위한 고속 저주파수 파라미터 추정

  • 김은주 (전남대 공대 전기공학과) ;
  • 심관식 (전남대 공업기술연구소) ;
  • 김용구 (한국폴리텍 V대학 전기계측제어과) ;
  • 김의선 (신경대 정보통신학과) ;
  • 남해곤 (전남대 공대 전기공학과) ;
  • 임영철 (전남대 공대 전기공학과)
  • Published : 2009.06.01
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Abstract

This paper presents a Fourier based algorithm for estimating the parameters of the low frequency oscillating modes. The proposed methods estimates various parameters(frequency, damping factor, mode magnitude, phase) by fitting Fourier spectrum and phase with a damped exponential cosine function. Dominant frequency is selected by taking frequency corresponding to the peak spectrum, and damping factor is estimated using the left/right spectra of Fourier spectrum. In addition, mode magnitude is calculated by the normalized peak spectrum, and phase is estimated from spectrum phase. Also, we introduce an accuracy index in order to determine the accuracy of the estimated parameters, and the index is calculated using the deviations of the peak spectrum and the left/right spectra. The parameter estimation methods proposed in this paper include very simple arithmetical processes, so the algorithms are simple and the calculation speed is very fast. The proposed methods are applied to test functions with two dominant modes. The results show that the proposed methods are highly applicable to low frequency parameter estimation.

Keywords

References

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