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Published in:
2023 | OriginalPaper | Chapter
Role of Controller Zeroes in Stabilizing an Unstable System
Author : Shradha Kishore
Published in: Smart Technologies for Power and Green Energy
Publisher: Springer Nature Singapore
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Abstract
A controller is an integral component in any process. An unstable system can be paired with a PID controller in a closed-loop feedback configuration to obtain a desired response. Insertion of a controller results in adding a pole at origin and two zeroes into the transfer function at a location determined by the tuning strategy employed. If placed suitably, the zeroes of the controller can pull the root locus starting at an unstable pole and terminating at a stable zero towards the stable left half. This paper presents the suitability of a tuning technique not only from the response of the output but also by graphical depiction of the change in the pole-zero patterns caused by the tuning technique. The system chosen for the demonstration is an open-loop unstable Maglev system which is gaining prominence in green and environment-friendly transportation and the tuning techniques chosen are Zeigler–Nichols and pole placement techniques.