Design of IMC filter for PID control strategy of open-loop unstable processes with time delay

被引:27
|
作者
Shamsuzzoha, M. [2 ]
Skliar, Mikhail [3 ]
Lee, Moonyong [1 ]
机构
[1] Yeungnam Univ, Sch Chem Engn & Technol, Kyongsan 712749, South Korea
[2] Norwegian Univ Sci & Technol, Dept Chem Engn, N-7034 Trondheim, Norway
[3] Univ Utah, Dept Chem Engn, Salt Lake City, UT 84112 USA
关键词
unstable process; PID controller tuning; dead time process; IMC-PID design; robust analysis; IMC filter; MODIFIED SMITH PREDICTOR;
D O I
10.1002/apj.497
中图分类号
TQ [化学工业];
学科分类号
0817 ;
摘要
A modified internal model control (IMC) filter has been proposed for the open-loop unstable process with time delay and a further IMCproportional-integral-derivative (PID) tuning rule is derived on the basis of the proposed IMC filter. Investigation of the IMC filter structure clearly demonstrates that a critically damped filter does not always provide satisfactory response and that this is probably due to lack of sufficient integral action. The conventional, critically damped filter is therefore replaced with a more general, second-order IMC filter for improved integral action. The present investigation shows that for the most unstable processes, the underdamped IMC filter provides the desired integral action and improves the closed-loop performance of the system except for the unstable processes with a strong lead term. An exhaustive simulation studies has been performed to show the advantage of the proposed method in both nominal and robust cases. By incorporating Kharitonov's theorem, closed-loop time constant (lambda) guidelines have been provided for the first-order delayed unstable process (FODUP). Copyright (C) 2010 Curtin University of Technology and John Wiley & Sons, Ltd.
引用
收藏
页码:93 / 110
页数:18
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