Comparing PI controller Performance for Non Linear Process Model

Comparing PI controller Performance for Non Linear Process Model

  ijett-book-cover  International Journal of Engineering Trends and Technology (IJETT)          
  
© 2013 by IJETT Journal
Volume-4 Issue-3                       
Year of Publication : 2013
Authors :  Abhishek Sharma , Nithya Venkatesan

Citation 

Abhishek Sharma , Nithya Venkatesan. "Comparing PI controller Performance for Non Linear Process Model". International Journal of Engineering Trends and Technology (IJETT). V4(3):242-245 Mar 2013. ISSN:2231-5381. www.ijettjournal.org. published by seventh sense research group

Abstract

This paper demonstrates the efficient method of tuning PI controller parameters by comparing different tuning rules. The method implies an analytical calculation of the controller gain ? ? , Integral time ? ? for a PI controlled system which is modeled to be a First Order Plus Dea d Time (FOPDT) process. A bench mark non linear system, conical tank is considered for study for which the identified transfer function model to be a FOPTD model. A MATLAB program with an objective is written to find out the optimum value for the PI controller parameter which can achieve the system requirements to minimize the overshoot, to maintain a fast system response, removal of dead time and to maintain robustness . The performance of the contr oller for different tuning rules has been investigated in a MATLAB simulation environment. Out of these differe nt controllers tuning methods Suyama, Tsang and Rad outperforms well with no overshoot. For setting time Astrom and Hagglund gives better result. This tuning method gives the better results based on performance indices also

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Keywords
FOPDT Model, PI Controller, Tuning.