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Language: English

Conflict of Interest: In relation to this article, we declare that there is no conflict of interest.

Publication history: Received October 10, 2007
Accepted November 29, 2007

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 unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.

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PID controller design for integrating processes with time delay

Md. Shamsuzzoha Moonyong Lee^†

School of Chemical Engineering and Technology, Yeungnam University, Gyeongsan 712-749, Korea

Korean Journal of Chemical Engineering, July 2008, 25(4), 637-645(9), 10.1007/s11814-008-0106-2

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Abstract

A simple IMC-PID controller design technique is proposed on the basis of the IMC principle for two representative integrating processes with time delay. Further, it is extended to integrating processes with negative and positive zero as well. The proposed PID controller design method is mainly focused on the disturbance rejection, which causes the overshoot in the setpoint response, and a two-degree-of-freedom (2DOF) control structure is used to eliminate this overshoot. The simulation results show the superiority of the proposed tuning rule over other existing methods, when the controller is tuned to have the same robustness level by evaluating the peak of the maximum sensitivity (Ms). The closed loop time constant (λ) has only one user-defined tuning parameter in the proposed method. A guideline is suggested for the selection of λ for different robustness levels by evaluating the value of Ms over a wide range of θ/τ ratios.

Keywords

PID Controller Tuning Integrating Process with Time Delay Disturbance Rejection Two-Degree-of-Freedom Controller

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