Please use this identifier to cite or link to this item: http://scholarbank.nus.edu.sg/handle/10635/62619
Title: PI tuning in terms of gain and phase margins
Authors: Fung, H.-W.
Wang, Q.-G. 
Lee, T.-H. 
Keywords: Frequency response
Gain margin
Graphical method
Phase margin
PID controller
Issue Date: Sep-1998
Source: Fung, H.-W.,Wang, Q.-G.,Lee, T.-H. (1998-09). PI tuning in terms of gain and phase margins. Automatica 34 (9) : 1145-1149. ScholarBank@NUS Repository.
Abstract: In this paper, a simple PI controller design method is proposed which can achieve user-specified gain and phase margins if they are suitable, or otherwise the automatically adjusted alternatives for performance enhancement. Unlike reduced-order model-based tuning methods, exact margins, once specified or adjusted, can be accomplished regardless of the process order and damping nature. The response of the closed-loop system using the proposed design is hence more predictable than those using model-based methods when performance specifications are given in gain and phase margins. The proposed method is based on finding the intersections between two graphs that are plotted using the frequency response of the process. The given gain and phase specifications can be achieved if intersections can be found, and each intersection corresponds to one solution. Suggestions are provided on how to modify the specifications for achieving satisfactory responses for cases where there are no solution or when the specifications can be met but poor responses result. Simulation examples are given to show the usefulness of the method. © 1998 Elsevier Science Ltd. All rights reserved.
Source Title: Automatica
URI: http://scholarbank.nus.edu.sg/handle/10635/62619
ISSN: 00051098
Appears in Collections:Staff Publications

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