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The Design of PI Controller Using Saturation Function  

Oh, Seung-Rohk (Dankook University, Dept. of Electronics Eng.)
Publication Information
Journal of the Institute of Electronics Engineers of Korea SC / v.45, no.6, 2008 , pp. 102-107 More about this Journal
Abstract
We propose an autotuning algorithm for PI controller with unknown plant. The proposed algorithm uses a saturation function and time delay element as a test signal. Since the integral element of PI controller reduces a phase margin in the closed loop system, the closed loop system could be resulted in unstable with PI controller. To avoid unstable in the closed loop system with PI controller, the proposed algorithm identifies one point information in the 3rd quadrant of Nyquist plot with a time delay element. The proposed method improves an accuracy of one point identified information with one saturation function. We demonstrate a performance of the proposed method via a simulation.
Keywords
autotuning; time delay; saturation function; PI controller;
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