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

  • 제65권4호
  • /
  • Pages.652-658
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  • 2016
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  • 1975-8359(pISSN)
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  • 2287-4364(eISSN)
대한전기학회 (The Korean Institute of Electrical Engineers)
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미지의 상수 오프셋을 갖는 삼각함수 외란 추정을 위한 모델기반 저차 외란 관측기 설계

Design of a Model-Based Low-Order Disturbance Observer to Estimate a Sinusoidal Disturbance with Unknown Constant Offset

  • Lee, Cho-Won (Dept. of Electrical and Engineering, Myongji University) ;
  • Son, Young Ik (Dept. of Electrical and Engineering, Myongji University)
  • 투고 : 2016.02.01
  • 심사 : 2016.03.25
  • 발행 : 2016.04.01
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초록

In practical control systems differences between nominal and real systems arise from internal uncertainties and/or external disturbances. This paper presents a model-based low-order disturbance observer for a sinusoidal disturbance with unknown constant offset. By using the disturbance model of a biased harmonic signal, the proposed method can successfully estimate the biased sinusoidal disturbance with unknown amplitude and phase but known frequency. At the first stage of the observer design, a model-based disturbance observer is designed when all the system states are measurable. Next, a sufficient condition is presented for the proposed observer to estimate the sinusoidal disturbance with a minimal-order additional dynamics using only output measurement. Comparative computer simulations are performed to test the performance of the proposed method. The simulation results show the enhanced performance of the proposed disturbance observer.

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참고문헌

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