PID control of FOPDT plants with dominant dead time based on the modulus optimum criterion

The modulus optimum (MO) criterion can be used for analytical design of the PID controller for linear systems with dominant dead time. However, although the method usually gives fast and non-oscillating closed-loop responses, in the case of large dead time the stability margin gets reduced and even...

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Bibliographic Details
Published in:Archives of control sciences 2016-03, Vol.26 (1), p.5-17
Main Author: Cvejn, Jan
Format: Article
Language:English
Subjects:
dead time
magnitude optimum
modulus optimum
PID controller
process control
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Summary:The modulus optimum (MO) criterion can be used for analytical design of the PID controller for linear systems with dominant dead time. However, although the method usually gives fast and non-oscillating closed-loop responses, in the case of large dead time the stability margin gets reduced and even non-stable behavior can be observed. In this case a correction of the settings is needed to preserve the stability margin. We describe and compare two methods of design of the PID controller based on the MO criterion that for the stable first-order systems with dead time preserve the stability margin, trying to keep maximum of the performance of the original MO settings.
ISSN:2300-2611
1230-2384
2300-2611
DOI:10.1515/acsc-2016-0001