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Optimal design of PID controllers including Smith predictor structure by the model identification  

Cho, Joon-Ho (Department of Control and Instrumentation Engineering, Wonkwang University)
Hwang, Hyung-Soo (School of Electrical, Electronics and Information Engineering, Wonkwang University)
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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.
Keywords
Identification; Smith-predictor; LSE; PID controller;
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