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Development of a closed form nonlinear predictive control law based on a class of wiener models / Shraddha Deshpande in Industrial & engineering chemistry research, Vol. 49 N° 1 (Janvier 2010) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 49 N° 1 (Janvier 2010) . - pp. 148–165 Titre : Development of a closed form nonlinear predictive control law based on a class of wiener models Type de document : texte imprimé Auteurs : Shraddha Deshpande, Auteur ; Sachin C. Patwardhan, Auteur ; Ravi Methekar, Auteur Année de publication : 2010 Article en page(s) : pp. 148–165 Note générale : Industrial chemistry Langues : Anglais (eng) Mots-clés : Development--Closed--Nonlinear--Predictive--Control--Class--Wiener  Models Résumé : Nonlinear model predictive control (NMPC) is increasingly being used for controlling microscale and system-on-chip devices, which exhibit complex and very fast dynamics. For effective control of such systems it is necessary to develop computationally efficient approaches for solving the NMPC problem. In this work, a Wiener type model has been used for capturing dynamics of multivariable nonlinear systems with fading memory. The resulting discrete nonlinear state space model is used to generate multistep predictions and formulate an unconstrained NMPC problem. A closed form solution to this problem is constructed analytically using the theory of solutions of quadratic operator polynomials. The effectiveness of the resulting quadratic control law is demonstrated by conducting simulation studies on a proton exchange membrane fuel cell (PEMFC) system, which exhibits fast dynamics and input multiplicity behavior. The quadratic control law is expected to control the PEMFC at its optimum (singular) operating point. The proposed laws achieve a fast and smooth transition from a suboptimal operating point to the optimum operating point with significantly small computation time. The proposed law is also found to be robust in the face of moderate perturbation in the unmeasured disturbances. The simulation results are validated by conducting experimental studies on a single cell PEMFC system and a benchmark heater−mixer setup that exhibits input multiplicity behavior. Through the experimental studies, we demonstrate that the proposed quadratic control law is able to operate the system at a singular operating point and establish the feasibility of employing the proposed control law for systems with very fast dynamics. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie801284b [article] Development of a closed form nonlinear predictive control law based on a class of wiener models [texte imprimé] / Shraddha Deshpande, Auteur ; Sachin C. Patwardhan, Auteur ; Ravi Methekar, Auteur . - 2010 . - pp. 148–165. Industrial chemistry Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 49 N° 1 (Janvier 2010) . - pp. 148–165 Mots-clés : Development--Closed--Nonlinear--Predictive--Control--Class--Wiener  Models Résumé : Nonlinear model predictive control (NMPC) is increasingly being used for controlling microscale and system-on-chip devices, which exhibit complex and very fast dynamics. For effective control of such systems it is necessary to develop computationally efficient approaches for solving the NMPC problem. In this work, a Wiener type model has been used for capturing dynamics of multivariable nonlinear systems with fading memory. The resulting discrete nonlinear state space model is used to generate multistep predictions and formulate an unconstrained NMPC problem. A closed form solution to this problem is constructed analytically using the theory of solutions of quadratic operator polynomials. The effectiveness of the resulting quadratic control law is demonstrated by conducting simulation studies on a proton exchange membrane fuel cell (PEMFC) system, which exhibits fast dynamics and input multiplicity behavior. The quadratic control law is expected to control the PEMFC at its optimum (singular) operating point. The proposed laws achieve a fast and smooth transition from a suboptimal operating point to the optimum operating point with significantly small computation time. The proposed law is also found to be robust in the face of moderate perturbation in the unmeasured disturbances. The simulation results are validated by conducting experimental studies on a single cell PEMFC system and a benchmark heater−mixer setup that exhibits input multiplicity behavior. Through the experimental studies, we demonstrate that the proposed quadratic control law is able to operate the system at a singular operating point and establish the feasibility of employing the proposed control law for systems with very fast dynamics. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie801284b