DocumentCode :
2754154
Title :
Variable structure control for a continuous bioreactor
Author :
Tham, H.J. ; Hussain, M.A. ; Ramachandran, K.B.
Author_Institution :
Dept. of Chem. Eng., Malaya Univ., Kuala Lumpur, Malaysia
Volume :
1
fYear :
2000
fDate :
2000
Firstpage :
433
Abstract :
Fermentation is known to be a highly nonlinear process and it requires a nonlinear controller for effective control. The 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
Keywords :
Lyapunov methods; asymptotic stability; control nonlinearities; fermentation; nonlinear control systems; nonlinear differential equations; process control; variable structure systems; Lyapunov´s theorem; chattering; continuous baker´s yeast production; continuous bioreactor; control input derivative; external disturbance rejection; highly nonlinear process; sliding mode control; switching coefficients; variable structure control; Aerospace engineering; Bioreactors; Chemical engineering; Control systems; Electric variables control; Feeds; Nonlinear control systems; Power engineering and energy; Sliding mode control; Variable structure systems;
fLanguage :
English
Publisher :
ieee
Conference_Titel :
TENCON 2000. Proceedings
Conference_Location :
Kuala Lumpur
Print_ISBN :
0-7803-6355-8
Type :
conf
DOI :
10.1109/TENCON.2000.893705
Filename :
893705
Link To Document :
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