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- In relation to this article, we declare that there is no conflict of interest.
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Received May 22, 2003
Accepted October 1, 2003
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This is an Open-Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/bync/3.0) which permits
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Control of pH Processes Based on the Genetic Algorithm
Department of Chemical Engineering, Hanyang University, Seoul 133-791, Korea 1Infortrol, Inc., Yangchun-Ku, Seoul 158-735, Korea
Korean Journal of Chemical Engineering, January 2004, 21(1), 6-13(8), 10.1007/BF02705374
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Abstract
In this work, we propose a PID control strategy based on the genetic algorithm coupled with cubic spline interpolation method for the control of pH processes. The control scheme proposed in the present work consists of closed-loop identification based on the genetic algorithm and cubic spline method. First, we compute the parameters (KC, tI, tD) of the PID controller using relay feedback and apply these parameters to control the pH Process. Then approximate linear models corresponding to each pH range are obtained by the closed-loop identification based on closed-loop operation data. The optimal parameters of the PID controller at each pH region are then computed by using the genetic algorithm. From numerical simulations and control experiments we could achieve better control performance compared to the conventional fixed gain PID control method.
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Kim K, Kwon T, Yeo U, J. Chem. Eng. Jpn., 33(2), 285 (2000)
Klatt KU, Engell S, Ind. Eng. Chem. Res., 35(10), 3511 (1996)
Yeo YK, Kwon TI, Ind. Eng. Chem. Res., 38(3), 978 (1999)
Ljung L, McKelvey T, Signal Process., 52, 209 (1996)
Loh AP, Looi KO, Fong KF, J. Proc. Control., 5, 355 (1995)
McAvoy TJ, Hsu E, Lowenthal S, Ind. Eng. Chem. Process Des. Dev., 11, 68 (1972)
VandenHof PMJ, "Closed-loop Issues in System Identification," Proc. of the 11th IFAC Symposium on System Identification, Fukuoka, Japan, 2, 1651, 2, 1651 (1997)
Zhang J, Ind. Eng. Chem. Res., 40(14), 3164 (2001)
