Abstract
This paper deals with robust control against parameter uncertainty including disturbance for a variable speed refrigeration system (VSRS) based on a sliding mode control with an optimal switching hyper-plane. At first, a practical state-space model of VSRS was presented for applying linear transformation to a transfer function model obtained by performing experiments at near operation point. Next, a sliding mode controller (SMC) was designed to maintain robust control performance and control accuracy for the VSRS. Especially, SMC with optimal switching hyper-plane was designed by applying the optimal control principle to minimize variation of target state variable near the sliding surface. Finally, some computer simulations and real experiments for the VSRS were conducted to verify the validity of the suggested SMC. Results showed that the suggested SMC had strong robustness against model uncertainty and disturbance. Moreover, robust control performance and control accuracy by SMC were proven by comparing with PI control results under the same experimental conditions.
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