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International Journal of

Recent Trends in Engineering

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International Journal of Recent Trends in Engineering (IJRTE)

ISSN 1797-9617

Volume 1,  Number 4,  May 2009

Issue on Electrical & Electronics

Page(s): 41-45

A Simple Method of Tuning PI Controllers for Interval Plant of Cold Rolling Mill

           S.Umamaheswari, V.Palanisamy, M.Chidambaram

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Abstract

The mathematical model (Interval Plant) of the web guide in rolling mill is controlled using PI controller. The given interval plant is approximated to first order plus time delay with integrator (FOPTDI) system. The equating Coefficient (EC) method  proposed by Padmasree et. al. for design PI controllers for FOPTD systems is extended to FOPTDI systems. The equating coefficient method gives simple equations for the controller settings. This method is based on matching the coefficient of corresponding powers of s in the numerator and that in the denominator of the closed loop transfer function. Controllers are designed using single tuning parameter. The performance of the closed loop system is evaluated for both the original and the approximated mod The controllers are also tuned using Ziegler –Nichols technique (Z-N), Internal Model Control (IMC). and the performance are compared by simulation.

Index Terms

Interval plant, Equating coefficient method, IMC, Z-N

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