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Modifier-adaptation methodology for real-time optimization / A. Marchetti in Industrial & engineering chemistry research, Vol. 48 N° 13 (Juillet 2009) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 48 N° 13 (Juillet 2009) . - pp. 6022–6033 Titre : Modifier-adaptation methodology for real-time optimization Type de document : texte imprimé Auteurs : A. Marchetti, Auteur ; B. Chachuat, Auteur ; D. Bonvin, Auteur Année de publication : 2009 Article en page(s) : pp. 6022–6033 Note générale : Chemical engineering Langues : Anglais (eng) Mots-clés : Real-time  optimization  scheme  Necessary  conditions  of  optimality  (NCO)  Plant-model  mismatch Résumé : The ability of a model-based real-time optimization (RTO) scheme to converge to the plant optimum relies on the ability of the underlying process model to predict the plant’s necessary conditions of optimality (NCO). These include the values and gradients of the active constraints, as well as the gradient of the cost function. Hence, in the presence of plant−model mismatch or unmeasured disturbances, one could use (estimates of) the plant NCO to track the plant optimum. This paper shows how to formulate a modifed optimization problem that incorporates such information. The so-called modifiers, which express the difference between the measured or estimated plant NCO and those predicted by the model, are added to the constraints and the cost function of the modified optimization problem and are adapted iteratively. Local convergence and model-adequacy issues are analyzed. The modifier-adaptation scheme is tested experimentally via the RTO of a three-tank system. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie801352x [article] Modifier-adaptation methodology for real-time optimization [texte imprimé] / A. Marchetti, Auteur ; B. Chachuat, Auteur ; D. Bonvin, Auteur . - 2009 . - pp. 6022–6033. Chemical engineering Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 48 N° 13 (Juillet 2009) . - pp. 6022–6033 Mots-clés : Real-time  optimization  scheme  Necessary  conditions  of  optimality  (NCO)  Plant-model  mismatch Résumé : The ability of a model-based real-time optimization (RTO) scheme to converge to the plant optimum relies on the ability of the underlying process model to predict the plant’s necessary conditions of optimality (NCO). These include the values and gradients of the active constraints, as well as the gradient of the cost function. Hence, in the presence of plant−model mismatch or unmeasured disturbances, one could use (estimates of) the plant NCO to track the plant optimum. This paper shows how to formulate a modifed optimization problem that incorporates such information. The so-called modifiers, which express the difference between the measured or estimated plant NCO and those predicted by the model, are added to the constraints and the cost function of the modified optimization problem and are adapted iteratively. Local convergence and model-adequacy issues are analyzed. The modifier-adaptation scheme is tested experimentally via the RTO of a three-tank system. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie801352x