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http://dx.doi.org/10.5916/jkosme.2009.33.5.721

PID Control of Unstable Processes with Time Delay  

Lee, Soo-Lyong (동명대학교 조선공학과)
Lee, Yun-Hyung (한국항만연수원 부산연수원)
Ahn, Jong-Kap (한국항만연수원 부산연수원)
Son, Jung-Ki (한국항만연수원 부산연수원)
Ryu, Ki-Tak (한국해양수산연수원)
So, Myung-Ok (한국해양대학교 선박전자기계공학부)
Publication Information
Journal of Advanced Marine Engineering and Technology / v.33, no.5, 2009 , pp. 721-728 More about this Journal
Abstract
PID control is widely used to control stable processes, however, PID control for unstable processes is less common. In this paper, systematic tuning methods are derived to tune the PID controller for unstable FOPTD(Forst Order Plus Time Delay) processes. The proposed PID controllers for set-point tracking and disturbance rejection problem are tuned based on minimizing the performance indexes (IAE, ISE, ITAE) using a real-coded genetic algorithm. Simulation example is given to illustrate the set-point tracking and disturbance rejection performance of the proposed method.
Keywords
Unstable FOPTD(First Order Plus Time Delay) process; PID controller; Performance index; Real-coded genetic algorithm;
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