Nonlinear analysis and control of a continuous fermentation process

摘要: Abstract Different types of nonlinear controllers are designed and compared for a simple continuous bioreactor operating near optimal productivity. This point is located close to fold bifurcation point. Nonlinear analysis stability, controllability zero dynamics used investigate open-loop system properties, explore the possible control difficulties select output be in structure. A wide range tested including pole placement LQ controllers, feedback input–output linearization controller based on direct passivation. The comparison time-domain performance investigating stability region, robustness tuning possibilities controllers. Controllers using partial state substrate concentration not directly depending reaction rate recommended fermenter. Passivity have been found globally stable, very sensitive uncertainties parameter but they require full feedback.