Abstract

This work concerns the synthesis of dynamic output feedback controllers for minimum-phase nonlinear systems. The problem is addressed first for open-loop stable and then for general nonlinear systems, leading to dynamic one- and two-degree-of-freedom controllers, respectively. The derivation of the controllers is based on state-space considerations, essentially involving combination of state feedback and state observers. An input/output interpretation of the control structures illustrates the importance of alternative state-space realizations of the inverse system for the controller implementation. Finally, the issue of closed-loop stability is discussed and precise internal stability conditions are derived.

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