Tuning PI controllers for stable processes with specifications on gain and phase margins

In industrial practice, controller designs are performed based on an approximate model of the actual process. It is essential to design a control system which will exhibit a robust performance because the physical systems can vary with operating conditions and time. Gain and phase margins are well k...

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Bibliographic Details
Published in:	ISA transactions 2004-04, Vol.43 (2), p.297-304
Main Author:	Kaya, Ibrahim
Format:	Article
Language:	eng
Subjects:	Applied sciences Computer science control theory systems Control theory. Systems Exact sciences and technology Gain margin General equipment and techniques IMC design Instruments, apparatus, components and techniques common to several branches of physics and astronomy Phase margin Physics PI controller Servo and control equipment robots Time delay
Online Access:	Get full text
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Summary:	In industrial practice, controller designs are performed based on an approximate model of the actual process. It is essential to design a control system which will exhibit a robust performance because the physical systems can vary with operating conditions and time. Gain and phase margins are well known parameters for evaluating the robustness of a control system. This paper presents a tuning algorithm to design and tune PI controllers for stable processes with a small dead time while meeting specified gain and phase margins. Simulation examples are given to demonstrate that the proposed design method can result, in a closed-loop system, in better performances than existing design methods which are also based on user-specified gain and phase margins.
ISSN:	0019-0578 1879-2022