Nonlinear control strategies for continuous fermenters

Nonlinear controllers based on exact linearization are designed and evaluated for continuous fermenters. The dilution rate and feed substrate concentration are considered as manipulated inputs in single-input/single-output strategies for productivity control. The resulting controllers are compared t...

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Bibliographic Details
Published in:Chemical engineering science 1992, Vol.47 (4), p.821-835
Main Authors: Henson, Michael A., Seborg, Dale E.
Format: Article
Language:English
Subjects:
Biological and medical sciences
Biotechnology
Fundamental and applied biological sciences. Psychology
Methods. Procedures. Technologies
Microbial engineering. Fermentation and microbial culture technology
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Summary:Nonlinear controllers based on exact linearization are designed and evaluated for continuous fermenters. The dilution rate and feed substrate concentration are considered as manipulated inputs in single-input/single-output strategies for productivity control. The resulting controllers are compared theoretically and via simulation. It is shown that state—space linearization techniques are not appropriate for this class of fermenters. Exact input—output-linearizing control employing the dilution rate as the manipulated input is shown to provide excellent regulatory behavior. Conversely, input—output linearization with the feed substrate concentration as the manipulated input is problematic. The exact approach yields unreasonably large control moves while an approximate technique recently proposed results in very sluggish responses. A modified approach to exact input—output linearization is proposed that results in satisfactory control.
ISSN:0009-2509
1873-4405
DOI:10.1016/0009-2509(92)80270-M