BEJARANO PELLICER, GUILLERMO, Rodriguez, David , Alfaya, Jose A. , Gil, Juan D. , Ortega, Manuel G.
Si
IFAC-PapersOnLine
Proceedings Paper
Científica
0.298
01/01/2018
000451094400019
This paper addresses the temperature control of a refrigerated chamber, using a vapour compression refrigeration system. A cascade control strategy is proposed, where the outer controller regulates the chamber temperature by generating a reference on the cooling power to be satisfied by the inner controller, which manipulates the actual manipulated variables: the compressor speed and the expansion valve opening. Since two control variables are available to satisfy only a certain cooling demand, energy efficiency is addressed to generate the required cooling power as efficiently as possible. A simple decoupling strategy is applied to reduce the high coupling between both controlled variables, while the PID parameters are calculated applying affine parameterisation and considering a certain condition for robust stability. The performance of the proposed control strategy is evaluated in simulation, concerning reference tracking and disturbance rejection. (C) 2018, IFAC (International Federation of Automatic Control) Hosting by Elsevier Ltd. All rights reserved.
Vapour-compression refrigeration; Cascade control; Optimization; Uncertain linear systems; Decoupling; Robust stability