Journal of the Institute of Electronics Engineers of Korea SC (전자공학회논문지SC)

The Institute of Electronics and Information Engineers (대한전자공학회)
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Optimal design of PID controllers including Smith predictor structure by the model identification

모델 동정에 의한 Smith predictor 구조를 갖는 최적의 PID 제어기 설계

  • Cho, Joon-Ho (Department of Control and Instrumentation Engineering, Wonkwang University) ;
  • Hwang, Hyung-Soo (School of Electrical, Electronics and Information Engineering, Wonkwang University)
  • 조준호 (원광대학교 제어계측공학과) ;
  • 황형수 (원광대학교 전기전자및정보공학부)
  • Published : 2007.01.25
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Abstract

In this paper, a new method for first order plus dead time(FOPDT) model identification is proposed, which can identity multiple points on a process step response in terms of classification of time response. The process input and output to the test are decomposed into the transient part and the steady-state part. The steady-state part express one FOPDT model and the transient part express variously FOPDT model using least square estimation method. The optimum parameter tuning algorithm for PID controller of the Smith Predictor is proposed through ITAE as performance index. The Simulation results show the validity and improvement of performance for various processes.

본 논문은 시간 응답을 과도응답과 정상상태 응답으로 분류하여 1차의 지연시간을 포함한 공정을 동정하는 새로운 모델링 방법을 제시했다. 먼저 공정의 입.출력 데이터를 분석하여 공정의 상태를 정상상태 응답과 과도상태 응답으로 분류한다. 그 다음 최소 자승법을 사용하여 정상상태 응답은 하나의 1차의 지연시간을 갖는 공정으로 추정하고, 과도상태 응답은 여러 개의 모델로 나누어 모델링 한다. 최적의 PID 동조법으로는 지연시간을 보상하는 Smith- Predictor 구조에 성능지수 ITAE값이 최소가 되도록 설계하였다. 시뮬레이션을 통하여 다양한 공정에 대하여 본 논문에서 제안한 방법을 적용하여, 모델축소 방법의 정확성 및 제어기 성능의 개선을 보였다.

Keywords

References

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