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PI Control with the Smith Predictive Controller for a Variable Speed Refrigeration System  

Hua, Li (Department of Refrigeration and Air-conditioning Engineering, Graduate School, Pukyong National University)
Choi, Jeong-Pil (Department of Refrigeration and Air-conditioning Engineering, Graduate School, Pukyong National University)
Jeong, Seok-Kwon (School of Mechanical Engineering, Pukyong National University)
Yang, Joo-Ho (School of Mechanical Engineering, Pukyong National University)
Kim, Dong-Gyu (School of Mechanical Engineering, Pukyong National University)
Publication Information
International Journal of Air-Conditioning and Refrigeration / v.15, no.3, 2007 , pp. 129-136 More about this Journal
Abstract
In this paper, we suggest PI control with the Smith predictive controller to improve transient response of a variable speed refrigeration system (VSRS). As the refrigeration system has long dead time inherently, it is difficult to get fast responses of super-heat and reference temperature. We incorporated the Smith predictive controller into PI to compensate the effect of the long dead time of the system. At first, we introduced the decoupling model of the system to control capacity and superheat simultaneously and independently. Next, we designed the predictive controller of the superheat based on PI control law. Finally, the control performance by the proposed method was investigated through some numerical simulations and experiments. The results of the simulations and experiments showed that the proposed PI control with the predictive controller could obtain acceptable transient behaviour for the system.
Keywords
Variable speed refrigeration system; Superheat control; PI control law; Smith predictive controller; Decoupling model; Parameter sensitivity analysis; Dead time;
Citations & Related Records
Times Cited By KSCI : 4  (Citation Analysis)
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