Adaptive Nonlinear Control of the Bakers´ Yeast Fed-Batch Fermentation

The formulation of three nonlinear control laws is presented for the control of ethanol concentration in a bakers´ yeast fed-batch fermentation. The simulation results show that the adaptive version gives superior performance in the presence of modeling uncertainties. It is shown also that a fixed-parameter nonlinear controller incorporating integral action is acceptable but is more difficult to tune.