MPC for stable linear systems with model uncertainty

  • Authors:

  • Marco A. Rodrigues;Darci Odloak

  • Affiliations:

  • Department of Chemical Engineering, University of São Paulo, Av Prof Luciano Gualberto, trv 3 380, C.P. 61548, São Paulo 05508-900, Brazil;Department of Chemical Engineering, University of São Paulo, Av Prof Luciano Gualberto, trv 3 380, C.P. 61548, São Paulo 05508-900, Brazil

  • Venue:
  • Automatica (Journal of IFAC)
  • Year:
  • 2003

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Abstract

In this paper, we developed a model predictive controller, which is robust to model uncertainty. Systems with stable dynamics are treated. The paper is mainly focused on the output-tracking problem of a system with unknown steady state. The controller is based on a state-space model in which the output is represented as a continuous function of time. Taking advantage of this particular model form, the cost functions is defined in terms of the integral of the output error along an infinite prediction horizon. The model states are assumed perfectly known at each sampling instant (state feedback). The controller is robust for two classes of model uncertainty: the multi-model plant and polytopic input matrix. Simulations examples demonstrate that the approach can be useful for practical application.