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Predictive control of a bench-scale chemical reactor based on neural-network models

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2 Author(s)
Schenker, B. ; Mettler-Toledo AG, Schwerzenbach, Switzerland ; Agarwal, Mukul

The authors have developed a reliable long-range predictor, comprising two neural networks with external feedback in series, and investigated its applicability for model predictive control on a simulation example. The networks use external feedback of the process state, yielding a state-space mapping that eliminates the drawbacks of the input-output mapping of the feedforward networks. This paper applies the long-range predictor to the model predictive control of an experimental bench-scale semi-batch chemical reactor. Examples of yield maximization for a reaction with complex kinetics are used to assess the proposed predictive control scheme. Control performance is compared for predictors based on the proposed external-feedback networks and on conventional feedforward networks. Results for various operating conditions, disturbances, and included analytical models demonstrate the superiority of the proposed control scheme in experiments

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Control Systems Technology, IEEE Transactions on  (Volume:6 ,  Issue: 3 )