Enhancing the performance of parallel cascade control using Smith predictor

Parallel cascade controllers are used in chemical processing industries to improve the dynamic performance of a control system in the presence of disturbances. In the present work, a delay compensator has been incorporated in the primary loop of the parallel cascade control system. The secondary con...

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Bibliographic Details
Published in:	ISA transactions Vol. 48; no. 2; pp. 220 - 227
Main Authors:	Seshagiri Rao, A., Seethaladevi, S., Uma, S., Chidambaram, M.
Format:	Journal Article
Language:	English
Published:	Kidlington Elsevier Ltd 01-04-2009 Elsevier
Subjects:	Algorithms Applied sciences Cascade control Compensators Computer science; control theory; systems Computer Simulation Control system synthesis Control theory. Systems Controllers Delay Dynamical systems Dynamics Exact sciences and technology Feedback General equipment and techniques IMC method Instruments, apparatus, components and techniques common to several branches of physics and astronomy Mathematical models Models, Theoretical Numerical Analysis, Computer-Assisted Parallel cascade control Physics Poles Quality Control Servo and control equipment; robots Smith predictor Time delay IMC method Smith predictor Time delay Parallel cascade control Chemical industry dynamic control Cascade control Control synthesis Delay system Internal model control Robust control Delay time Smith control Predictive control
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Summary:	Parallel cascade controllers are used in chemical processing industries to improve the dynamic performance of a control system in the presence of disturbances. In the present work, a delay compensator has been incorporated in the primary loop of the parallel cascade control system. The secondary controller is designed using the internal model control (IMC) method. The primary controller is designed based on a direct synthesis method for the delay-free system. Design of controllers for slow (when the secondary loop dynamics is slow i.e. process contains poles sufficiently slower than the desired closed loop response) as well as fast dynamics (when the inner loop dynamics is fast i.e. process contains poles sufficiently faster than the desired closed loop response) of the secondary process is considered. The method provides robust control performances. Significant improvement in the closed loop performances are obtained with the delay compensator over that of a conventional parallel cascade control system. Several case studies are considered to show the advantage of the proposed method when compared to other recently reported methods.
Bibliography:	ObjectType-Article-1 SourceType-Scholarly Journals-1 ObjectType-Feature-2 content type line 23 ObjectType-Article-2 ObjectType-Feature-1
ISSN:	0019-0578 1879-2022
DOI:	10.1016/j.isatra.2008.10.011