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Temperature Control of a CSTR using Fuzzy Gain Scheduling

퍼지 게인 스케쥴링을 이용한 CSTR의 온도 제어

  • 김종화 (한국해양대학교 IT공학부) ;
  • 고강영 (한국해양대학교 대학원 제어계측공학과) ;
  • 진강규 (한국해양대학교 IT공학부)
  • Received : 2013.02.18
  • Accepted : 2013.07.24
  • Published : 2013.09.01

Abstract

A CSTR (Continuous Stirred Tank Reactor) is a highly nonlinear process with varying parameters during operation. Therefore, tuning of the controller and determining the transition policy of controller parameters are required to guarantee the best performance of the CSTR for overall operating regions. In this paper, a methodology employing the 2DOF (Two-Degree-of-Freedom) PID controller, the anti-windup technique and a fuzzy gain scheduler is presented for the temperature control of the CSTR. First, both a local model and an EA (Evolutionary Algorithm) are used to tune the optimal controller parameters at each operating region by minimizing the IAE (Integral of Absolute Error). Then, a set of controller parameters are expressed as functions of the gain scheduling variable. Those functions are implemented using a set of "if-then" fuzzy rules, which is of Sugeno's form. Simulation works for reference tracking, disturbance rejecting and noise rejecting performances show the feasibility of using the proposed method.

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