Open AccessA robust non‐linear feedback control strategy for a class of bioprocesses
Author(s) -
Coutinho Daniel,
Wouwer Alain Vande
Publication year - 2013
Publication title -
iet control theory and applications
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.059
H-Index - 108
eISSN - 1751-8652
pISSN - 1751-8644
DOI - 10.1049/iet-cta.2012.0336
Subject(s) - control theory (sociology) , class (philosophy) , feedback control , robust control , control engineering , control (management) , computer science , engineering , control system , artificial intelligence , electrical engineering
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.