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Temperature Control of a CSTR using a Nonlinear PID Controller

비선형 PID 제어기를 사용한 CSTR의 온도 제어

  • Lee, Joo-Yeon (School of Ocean Science and Technology, Korea Maritime and Ocean University) ;
  • So, Gun-Baek (School of Ocean Science and Technology, Korea Maritime and Ocean University) ;
  • Lee, Yun-Hyung (Education and Research Team, Korea Institute of Maritime and Fisheries Technology) ;
  • So, Myung-Ok (Division of Marine Engineering, Korea Maritime and Ocean University) ;
  • Jin, Gang-Gyoo (Division of IT, Korea Maritime and Ocean University)
  • 이주연 (해양대학교 해양과학기술대학원) ;
  • 소건백 (해양대학교 해양과학기술대학원) ;
  • 이윤형 (한국해양수산연수원 교육연구팀) ;
  • 소명옥 (한국해양대학교 기관공학부) ;
  • 진강규 (한국해양대학교 IT공학부)
  • Received : 2014.11.28
  • Accepted : 2015.02.23
  • Published : 2015.05.01

Abstract

CSTR (Continuous Stirred Tank Reactor) which plays a key role in the chemical plants exhibits highly nonlinear behavior as well as time-varying behavior during operation. The control of CSTRs in the whole operating range has been a challenging problem to control engineers. So, a variety of feedback control forms and their tuning methods have been implemented to guarantee the satisfactory performance. This paper presents a scheme of designing a nonlinear PID controller incorporating with a GA (Genetic Algorithm) for the temperature control of a CSTR. The gains of the NPID controller are composed of easily implementable nonlinear functions based on the error and/or the error rate and its parameters are tuned using a GA by minimizing the ITAE (Integral of Absolute Error). Simulation works for reference tracking and disturbance rejecting performances and robustness to parameter changes show the feasibility of the proposed method.

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