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State estimation for partially unknown nonlinear systems: a class of integral high gain observers

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3 Author(s)
Aguilar, R. ; Dept. de Energia, Univ. Autonoma Metropolitana-Azcapotzalco, Mexico City, Mexico ; Martinez-Guerra, R. ; Maya-Yescas, R.

The classical problem of state estimation for a class of partially unknown nonlinear systems is considered. The proposed observer contains only an integral-type contribution of the measurement error, which provides robustness against noisy measurements and uncertainties. The estimation of the system state variables and the uncertain term is performed simultaneously. A convergent analysis of the proposed estimation methodology is performed. The estimation scheme is applied to a continuously stirred biochemical reactor; numerical experiments illustrate a good observer performance.

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Control Theory and Applications, IEE Proceedings -  (Volume:150 ,  Issue: 3 )