Journal
JOURNAL OF PROCESS CONTROL
Volume 19, Issue 1, Pages 38-47Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.jprocont.2008.02.003
Keywords
Dead-time systems; Smith predictors; Robustness; Dead-time compensators; Process control; Unstable processes
Funding
- CNPq-BRASIL
- CICYT-Spain
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This paper presents a unified approach for the design of dead-time compensators. The approach is based on a modified structure of the Smith predictor that allows to decouple the disturbance and set-point responses in order to tune the controller for a compromise between performance and robustness and is able to cope with unstable processes. The proposed structure is simple to analyse and tune. Moreover a novel robustness analysis of the unstable case is presented to demonstrate the limitations imposed by the unstable dynamics and the dead time. Cases studies are used to illustrate the advantages of the proposed controller. (C) 2008 Elsevier Ltd. All rights reserved.
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