| Title |
Robust Temperature Control for a Variable Speed Refrigeration System Based on Sliding Mode Control Using a Kalman State Observer and Feedforward Controller |
| Authors |
Ji Eun Lee ; Seok Kwon Jeong |
| DOI |
https://doi.org/10.6110/KJACR.2021.33.10.506 |
| Keywords |
가변속 냉동시스템; 강인 제어; 슬라이딩 모드 제어; 칼만 필터; 피드포워드 제어 Variable speed refrigeration system(VSRS); Robust control; Sliding mode control; Kalman filter; Feedforward control |
| Abstract |
This paper describes sliding mode control using a state observer with Kalman filter and feedforward controller for a variable speed refrigeration system (VSRS) to ensure robust control performance against model uncertainty and disturbance. The sliding mode control was designed using a state space model obtained from a practical transfer function model, which was obtained by conducting experiments near operation point. The control input of SMC was achieved from estimation of state variables by a state observer with Kalman filter. Additionally, the feedforward controller was designed to minimize the steady state error due to saturation function. Simulations and experiments were conducted to verify the control performance of the suggested SMC with the feedforward controller and the state observer with Kalman filter. The results of simulations and experiments showed that the proposed controller was capable of robust temperature control for VSRS despite stepwise changes of reference and external heat load. |