A robust non‐linear feedback control strategy for a class of bioprocesses. Issue 6 (1st April 2013)

• Record Type: Journal Article
• Authors: Coutinho, Daniel; Wouwer, Alain Vande
• Is Part Of: IET control theory & applications. Volume 7:Issue 6(2013)
• Page Start: 829
• Page End: 841
• Publication Date: 2013-04-01
• Subjects: bioreactors -- closed loop systems -- feedback -- nonlinear control systems -- observers -- robust control -- tracking; robust nonlinear feedback control strategy -- bioprocesses -- multiple‐input/multiple‐output robust approach -- bioprocess control -- cascaded‐loop strategy -- internal loop -- classical input‐to‐output feedback linearising controller -- nominal dynamics -- outer loop -- internal model principle -- zero steady‐state tracking error -- disturbance rejection -- constant signals -- robust stability -- closed‐loop system -- robust Luenberger‐like observer -- unmeasured state variables -- feedback linearising control law -- simultaneous control -- biomass -- substrate concentrations -- perfusion bioreactor; bioreactors -- closed loop systems -- feedback -- nonlinear control systems -- observers -- robust control -- tracking; robust nonlinear feedback control strategy -- bioprocesses -- multiple‐input/multiple‐output robust approach -- bioprocess control -- cascaded‐loop strategy -- internal loop -- classical input‐to‐output feedback linearising controller -- nominal dynamics -- outer loop -- internal model principle -- zero steady‐state tracking error -- disturbance rejection -- constant signals -- robust stability -- closed‐loop system -- robust Luenberger‐like observer -- unmeasured state variables -- feedback linearising control law -- simultaneous control -- biomass -- substrate concentrations -- perfusion bioreactor; Control theory -- Periodicals; Automatic control -- Periodicals; 629.8312
• DOI: 10.1049/iet-cta.2012.0336
• Languages: English
• ISSNs: 1751-8644

Abstract

Abstract : This study proposes a multiple‐input/multiple‐output robust approach to the control of bioprocesses based on a cascaded‐loop strategy. The internal loop is a classical input‐to‐output feedback linearising controller which is obtained from the nominal dynamics of the bioprocess. Then, the outer loop is designed based on the internal model principle to obtain zero steady‐state tracking error (and disturbance rejection) for constant signals while ensuring the robust stability of the overall closed‐loop system. In addition, a robust Luenberger‐like observer is proposed to estimate unmeasured state variables for the feedback linearising control law. The approach is applied to the simultaneous control of biomass and substrate concentrations in a perfusion/chemostat bioreactor, where the simulation results demonstrate the effectiveness of the proposed control strategy.