Nonlinear control of large-scale fed-batch yeast fermentation: control of the speci c growth rate

Abstract

Model-based feedback linearizing control is studied for the control of fed-batch yeast fermentation. For this purpose, the speci c growth rate of fed-batch baker\'s yeast fermentation is controlled with a state feedback linearizing control approach. All control algorithms are constructed on reliable primary measurements, data reconciliation, and state estimations developed previously. The obtained biomass concentrations and speci c growth rates are used in the control algorithms. Initially, the results of open-loop speci c growth rate controlled fed-batch baker\'s yeast fermentation are given to show the shortcomings of the existing control method in practice. The state feedback linearizing control of the speci c growth rate is then applied to the fed-batch baker\'s yeast fermentation. Different speci c growth rate pro les are investigated and results are presented. The successful implementation of the control of the speci c growth rate is shown under the critical speci c growth rate value and other limiting factors.