Model Predictive Control for changing economic targets

LIMÓN, DANIEL; FERRAMOSCA, ANTONIO; ALAMO, TEODORO; GONZÁLEZ, ALEJANDRO HERNÁN; ODLOAK, DARCI

Noordwijkerhout

Congreso; IFAC Conference on Nonlinear Model Predictive Control 2012 (NMPC'12); 2012

The objective of this paper is to present recent results on model predictive control for tracking in the context of economic operation of a industrial plant. The well-established hierarchical economic control is based on a Real Time Optimizer that calculates the economic target to the advanced controller, in this case model predictive controllers. The change of the economic parameters or constraints, or the existence of disturbances and modelling errors make that this target may change throughout the plant evolution. The MPC for tracking is an appealing formulation to deal with this issue since maintain the recursive feasibility and convergence under any change of the target. Thus, this MPC formulation is summarized as well as its properties. In virtue of these properties, it is demonstrated how the economic operation can be improved by integrating the Steady State Target Optimizer in the MPC. Then it is also shown how the proposed MPC can deal with practical problems such us zone control or distributed control. Finally, the economic control of the plant can be enhanced by adopting an economic MPC approach. A formulation capable to ensure economic optimality and target tracking is also shown.