Papers by Giuliana Becerra
parameter estimation in a photobioreactor for microalgae production?
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... University of Science and Technology, N-7491 Trondheim, Norway {giancarlo.marafioti, morten.h... more ... University of Science and Technology, N-7491 Trondheim, Norway {giancarlo.marafioti, morten.hovd}@itk.ntnu.no ∗∗ Control Department, SUPELEC, Plateau de Moulon, 91192 Gif sur Yvette, France {sihem ... This paper is an extension of the previous work of Becerra-Celis et ...
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This paper presents a nonlinear predictive control (NMPC) strategy applied to the continuous micr... more This paper presents a nonlinear predictive control (NMPC) strategy applied to the continuous microalgae cultivation process in a closed photobioreactor. The photo-bioreactor system is programmed to operate in a constant biomass density mode, in order to maintain the culture at the optimal population density and sustain high biomass production levels. This objective is achieved by regulating the biomass density while tracking a reference culture medium feeding profile determined off-line. The proposed NMPC approach is validated in simulation, and performances and benefits for the cell cultivations are compared to those obtained when applying a generic model control (GMC) law.
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This paper addresses a study of the regulation of the biomass density in a closed microalgal phot... more This paper addresses a study of the regulation of the biomass density in a closed microalgal photobioreactor by using a linearizing control approach. The photobioreactor system was programmed to operate in a constant biomass density mode, in order to maintain the culture at the optimal population density and sustaining high biomass production levels. The designed control law uses an input-output linearizing control in an inner loop, a proportional integral Derivative (P.I.D.) regulator has been added to cancel steady errors. In addition, this PID-regulator is supplied with an anti-windup compensator. Thus, the proposed strategy takes the internal dynamics into account and stabilizes them simultaneously with the control of the input-output behaviour of the system. Commonly, the output of the system is the biomass concentration. However, in this study, we propose to consider a new output: the ratio between two state variables, which is equivalent to the total inorganic carbon available quantity per cell. This new quantity is shown to lead to best regulation performance. We illustrate our approach with numerical simulations and show its benefits for the cell cultivations, mainly for ensuring achievement of the culture with regards to classical experiments problems.
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Papers by Giuliana Becerra