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Adaptive high gain observer extension and its application to bioprocess monitoring. (English) Zbl 1449.93127
Summary: The adaptive version of the high gain observer for the strictly triangular systems subjected to constant unknown disturbances is proposed here. The adaptive feature is necessary due to the fact that the unknown disturbance enters in a way that cannot be suppressed by the high gain technique. The developed observers are then applied to a culture of microorganism in a bioreactor, namely, to the model of the continuous culture of Spirulina maxima. It is a common practice that just the biomass (or substrate) concentration is directly measured as the output of the process for monitoring and control purposes. This paper thereby shows both by theoretical analysis and numerical simulation that the adaptive high-gain observers offer a realistic option of online software sensors for substrate estimation.
93C40 Adaptive control/observation systems
93B53 Observers
93C10 Nonlinear systems in control theory
93C95 Application models in control theory
92C75 Biotechnology
90C46 Optimality conditions and duality in mathematical programming
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