Relaxed Ziegler-Nichols Closed Loop Tuning of PI Controllers

A modification of the PI setting of the Ziegler-Nichols closed loop tuningmethod is proposed. The modification is based on a combination of the Skogestad SIMCtuning formulas for ´´integrator plus time-delay´´ processes with the Ziegler-Nichols tuning formulas assuming that the process is modeled as...

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Bibliographic Details
Published in:Modeling, identification and control identification and control, 2013-01, Vol.34 (2), p.83-97
Main Authors: Haugen, Finn, Lie, Bernt, Haugen, F., Bakke, R., Lie, B.
Format: Article
Language:English
Subjects:
closed loop
open loop
PI controller
relay-tuning
Skogestad
stability
tuning
Tyreus-Luyben
Ziegler-Nichols
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Summary:A modification of the PI setting of the Ziegler-Nichols closed loop tuningmethod is proposed. The modification is based on a combination of the Skogestad SIMCtuning formulas for ´´integrator plus time-delay´´ processes with the Ziegler-Nichols tuning formulas assuming that the process is modeled as an ´´integrator plus time-delay´´ process. The resulting PI settings provide improved stability margins compared with those obtained with the original Ziegler-Nichols PI settings. Compared with the well-known Tyreus-Luyben PI settings, the proposed PI settings give improved disturbance compensation. For processes with zero or a negligible time-delay, but with some lags in the form of time-constants, tuning based on ultimate gain and ultimate period may give poor results. Successful PI settings for such processes are proposed.
ISSN:0332-7353
1890-1328
DOI:10.4173/mic.2013.2.4