Variable structure control for a continuous bioreactor

Tham, H.J. and Hussain, Mohd Azlan and Ramachandran, K.B. (2000) Variable structure control for a continuous bioreactor. In: 2000 TENCON Proceedings, 2000, Kuala Lumpur, Malaysia.

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Fermentation is known to be a highly nonlinear process and it requires a nonlinear controller for effective control. This paper studies the application of variable structure control or sliding mode control with direct use of nonlinear model to a continuous baker's yeast production. Lyapunov's theorem is used to ensure asymptotic stability of the system, and also to determine the switching coefficients of the controller. The switching coefficients are calculated and determined during the process. To overcome chattering, the control input derivative is used as an auxiliary variable. The simulation results show smooth response for set point change. For external disturbance rejection, it was found that the controller is able to bring the state back to the sliding surface, and the state is maintained there for the subsequent time.

Item Type: Conference or Workshop Item (Paper)
Additional Information: Conference code: 57941 Cited By (since 1996): 2 Export Date: 5 March 2013 Source: Scopus CODEN: 85QXA Language of Original Document: English Correspondence Address: Tham, H.J.; Univ of Malaya, Kuala Lumpur, Malaysia Sponsors: IEEE
Uncontrolled Keywords: Computer simulation; Fermentation; Lyapunov methods; Mathematical models; Nonlinear control systems; Yeast; Variable structure control; Bioreactors.
Subjects: T Technology > TA Engineering (General). Civil engineering (General)
T Technology > TP Chemical technology
Divisions: Faculty of Engineering
Depositing User: Mr Jenal S
Date Deposited: 11 Jul 2013 01:27
Last Modified: 10 Feb 2021 03:16

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