Plant‐wide control of a hybrid process

This paper deals with the model predictive control (MPC) of an industrial hybrid process where continuous and batch units operate jointly: the crystallization section of a sugar factory. The paper describes a plant-wide predictive controller that takes into account, both, continuous objectives and manipulated variables, as well as those related to the discrete operation and logic of the batch units. The MPC is formulated with time events, so that a more efficient NLP optimization technique, instead of MINLP, could be applied. Adaptation is provided by model updating and error estimation. Results of the controller operation in an industrial simulator are provided. Copyright © 2007 John Wiley & Sons, Ltd.

[1]  Alberto Bemporad,et al.  The explicit linear quadratic regulator for constrained systems , 2003, Autom..

[2]  Wolfgang Marquardt,et al.  Detection and exploitation of the control switching structure in the solution of dynamic optimization problems , 2006 .

[3]  George Stephanopoulos,et al.  Perspectives on the synthesis of plant-wide control structures , 2000 .

[4]  Alberto Bemporad,et al.  Control of systems integrating logic, dynamics, and constraints , 1999, Autom..

[5]  Mark A. Pinsky,et al.  Stability criteria for linear Hamiltonian systems with uncertain bounded periodic coefficients , 2004 .

[6]  W. Colmenares,et al.  MLD systems: modeling and control. Experience with a pilot process , 2001, Proceedings of the 2001 IEEE International Conference on Control Applications (CCA'01) (Cat. No.01CH37204).

[7]  C. Kaya,et al.  Computational Method for Time-Optimal Switching Control , 2003 .

[8]  Sigurd Skogestad,et al.  Control structure design for complete chemical plants , 2004, Comput. Chem. Eng..

[9]  Jörg Raisch,et al.  Hierarchical Hybrid Control Synthesis and its Application to a Multiproduct Batch Plant , 2005 .

[10]  Peter J.T. Verheijen,et al.  Modeling and optimization of a sugar plant using hybrid Batch Model Predictive Control , 2002 .

[11]  Sigurd Skogestad,et al.  Plantwide control: the search for the self-optimizing control structure , 2000 .

[12]  H. P. Nott,et al.  An optimal control approach for scheduling mixed batch/continuous process plants with variable cycle time , 1999 .