Title Robust and Decoupling Approach to PID Control of Vapour-compression Refrigeration Systems
Authors Rodriguez, David , BEJARANO PELLICER, GUILLERMO, Alfaya, Jose A. , Ortega, Manuel G.
External publication Si
Means IFAC-PapersOnLine
Scope Proceedings Paper
Nature Científica
SJR Quartile 3
SJR Impact 0.29800
Publication date 01/01/2018
ISI 000435709300120
DOI 10.1016/j.ifacol.2018.06.185
Abstract This paper presents a combined approach to the design of PID control applied to vapour compression refrigeration systems. The underlying controller consists of two decentralised PIDs, aiming to control both the reference on the temperature of the evaporator secondary fluid, imposed by the cooling demand, and the degree of superheating, by manipulating the compressor speed and the expansion valve. A partial decoupling matrix is calculated to reduce the high coupling between the controlled variables, while the PIDs are tuned applying affine parameterisation and considering the condition for robust stability given by the study on the uncertainty sources and the estimation of the uncertainty region around a nominal linear model. The designed controller is applied to the system proposed in the Benchmark process challenge and some comparative simulations are presented and discussed, while the performance indices of the proposed controller with respect to the reference one are analysed. (C) 2018, IFAC (International Federation of Automatic Control) Hosting by Elsevier Ltd. All rights reserved.
Keywords Vapour-compression refrigeration; Uncertain linear systems; Decoupling; Robust stability; PID control
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