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Stability Analysis of First Order Plus Time Delay System under PI & PID Control for Simultaneous Parameter Variation

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4 Author(s)
Vijayan, V. ; Dept. of Instrumentation Engg., MIT Campus, Chennai-600044 ; Narayanan, S. ; Kanagasabapathy, P. ; Prakash, J.

This paper deals with a method of estimation of robust dead-time for first order plus time delay (FOPTD) process which does not violate the closed loop stability when Proportional-Integral (PI) parameters and Proportional-Integral-Derivative (PID) parameters as suggested by popular tuning techniques, have been used. Using the Hermite-Biehler Theorem applicable to quasi polynomials, we estimate the lower bound value of (T/L) and then the range of L for the two controller modes. This investigation will help to infer the amount of system parameters that can be tolerated before control system becomes unstable for the two controller modes.

Published in:

INDICON, 2005 Annual IEEE

Date of Conference:

11-13 Dec. 2005

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