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Multi-loop design of multi-scale controllers for multivariable processes

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Open access
Authors
Nandong, Jobrun
Zang, Zhuquan
Date
2014
Type
Journal Article

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Nandong, J. and Zang, Z. 2014. Multi-loop design of multi-scale controllers for multivariable processes. Journal of Process Control. 24: pp. 600-612.
Source Title
Journal of Process Control
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School
Curtin Sarawak
Remarks

NOTICE: this is the author’s version of a work that was accepted for publication in Journal of Process Control. Changes resulting from the publishing process, such as peer review, editing, corrections, structural formatting, and other quality control mechanisms may not be reflected in this document. Changes may have been made to this work since it was submitted for publication. A definitive version was subsequently published in Journal of Process Control, Vol.24, (2014). DOI: 10.1016/j.jprocont.2014.03.001

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Abstract

Based on the recently proposed (SISO) multi-scale control scheme, a new approach is introduced to design multi-loop controllers for multivariable processes. The basic feature of the multi-scale control scheme is to decompose a given plant into a sum of basic modes. To achieve good nominal control performance and performance robustness, a set of sub-controllers are designed based on the plant modes in such a way that they are mutually enhanced with each other so as to optimize the overall control objective. It is shown that the designed multi-scale controller is equivalent to a conventional PID controller augmented with a filter. The multi-scale control scheme offers a systematic approach to designing multi-loop PID controllers augmented with filters. Numerical studies show that the proposed multi-loop multi-scale controllers provide improved nominal performance and performance robustness over some well-established multi-loop PID controller schemes.