Title Optimal control analysis and Practical NMPC applied to refrigeration systems
Authors BEJARANO PELLICER, GUILLERMO, Ortega, M. G. , Normey-Rico, J. E. , Rubio, F. R.
External publication No
Means ISA Trans.
Scope Article
Nature Científica
JCR Quartile 1
SJR Quartile 1
Area International
Publication date 01/12/2020
ISI 000598662400008
DOI 10.1016/j.isatra.2020.07.041
Abstract This work is focused on optimal control of mechanical compression refrigeration systems. A reduced order state-space model based on the moving boundary approach is proposed for the canonical cycle, which eases the controller design. The optimal cycle (that satisfying the cooling demand while maximizing efficiency) is defined by three variables, but only two inputs are available, therefore the controllability of the proposed model is studied. It is shown through optimization simulations how optimal cycles for a range of the cooling demand turn out not to be achieved by keeping the degree of superheating to a minimum. The Practical NMPC and a well-known feedback-plus-feedforward strategy from the literature are compared in simulation, both showing trouble in reaching the optimal cycle, which agrees with the controllability study. (C) 2020 ISA. Published by Elsevier Ltd. All rights reserved.
Keywords Refrigeration system; Process control; Global optimization; Controllability study; Model predictive control
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