Einladung zum Vortrag im Kolloquium Technische Kybernetik

Real-time optimization of processes via adaptive extremum seeking control

Prof.Dr. Denis Dochain
Université Catholique de Louvain · Belgium

    Zeit: Dienstag · 20. 01. 2004 · 16:00 Uhr
    Ort: Raum V 9.31 · Pfaffenwaldring 9 · Campus Stuttgart-Vaihingen

Abstract

Most adaptive control schemes documented in the literature are developed for regulation to known set-points or tracking known reference trajectories. In some applications, however, the control objective could be to optimize an objective function which can be a function of unknown parameters, or to select the desired states to keep a performance function at its extremum value. Self-optimizing control and extremum seeking control are two methods to handle these kinds of optimization problems. The task of extremum seeking is to find the operating set-points that maximize or minimize an objective function. Although a large amount of research efforts has been done, a solid theoretical foundation has not yet been established for the stability and performance of extremum seeking control.
In this seminar, we present an alternative extremum seeking scheme for (bio)chemical reactors. The proposed scheme utilizes an explicit structure information of the objective function that depends on system states and unknown plant parameters. Since the scheme presented in this paper is based on Lyapunov's stability theorem, the global stability is ensured during the seeking of the extremum of the nonlinear continuous stirred tank bioreactors. It is shown that once a certain level of persistence of excitation (PE) condition is satisfied, the convergence of the extremum seeking mechanism can be guaranteed.

Biographical Information

Prof. Dr. Denis Dochain was born in 1956. He received his degree in Electrical engineering in 1982 from the Université Catholique de Louvain, Belgium. He completed his Ph.D. thesis in 1982 and a « thèse d'agrégation de l'enseignement supérieur » in 1986 and 1994, respectively, also at the same university. He has been CNRS associate researcher at the LAAS (Toulouse, France) in 1989, and Professor at the Ecole Polytechnique de Montréal, Canada in 1987-88 and 1990-92. He has been with the FNRS (Fonds National de la Recherche Scientifique, National Fund for Scientific Research), Belgium since 1990.
Since September 1999, he is Professor at the CESAME (Center for Systems Engineering and Applied Mechanics), Université Catholique de Louvain, Belgium, and Honorary Research Director of the FNRS. He is invited professor at Queen's University, Kingston, Canada since 2002. He is associate editor of the "Journal of Process Control", and member of the International Advisory Board of the "Canadian Journal of Chemical Engineering", and he is the chair of the IFAC Coordinating Committee on Industrial Systems.
His main research interests are in the field of distributed parameter systems, nonlinear systems, parameter and state estimation, and adaptive control with application to bioprocesses, chemical processes, pulp and paper processes, polymerisation reactors, and electric systems.