“Relaxed Ziegler-Nichols Closed Loop Tuning of PI Controllers”
Authors: Finn Haugen and Bernt Lie,Affiliation: Telemark University College
Reference: 2013, Vol 34, No 2, pp. 83-97.
Keywords: PI controller, tuning, open loop, closed loop, Ziegler-Nichols, Tyreus-Luyben, Skogestad, relay-tuning,performance, stability, robustness
Abstract: 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.
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DOI: 10.4173/mic.2013.2.4DOI forward links to this article:
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BibTeX:
@article{MIC-2013-2-4,
title={{Relaxed Ziegler-Nichols Closed Loop Tuning of PI Controllers}},
author={Haugen, Finn and Lie, Bernt},
journal={Modeling, Identification and Control},
volume={34},
number={2},
pages={83--97},
year={2013},
doi={10.4173/mic.2013.2.4},
publisher={Norwegian Society of Automatic Control}
};