A high-gain observer approach for monitoring microalgae cultures

FIGUEROA, J.L.; BIAGIOLA, S.; VANDE WOUWER, A.

Bahía Blanca

Congreso; XVIII Reunión de Trabajo en Procesamiento de la Información y Control; 2019

IIIE (CONICET-UNS) y DIEC (UNS)

Advanced control techniques for microalgal cultures usually demand the knowledge of several component concentrations which are, however, not always measurable online. In this context, inclusion of state estimation algorithms has a defining role. In this study, a software sensor is designed in the form of a combination of an extended sliding observer with two reduced order Luenberger ones. The contribution of this work is dedicated to the formulation of a state estimation approach for a five-state model of Isochrysis galbana growth under the influence of light irradiance. Inclusion of light incidence in microalgae growth forces to avoid existing estimation approaches that consist in a three-state representation based on Droop model dynamics. Performance of developed observer is illustrated by means of numerical simulations.