Robust passivity and feedback design for minimum-phase nonlinear systems with structural uncertainty

This paper addresses several important issues including robust passivity, feedback equivalence, and the global stabilization, for a class of nonlinear systems with gain bounded uncertainty. A robust version of the Kalman-Yacubovitch-Popov Lemma is derived, which provides a necessary and sufficient condition for a structural uncertain nonlineat system to be robust passive (resp. robust strictly passive). The robust KYP Lemma thus obtained enables us to build a feedback equivalence relationship between uncertain minimum-phase nonlinear systems having relative degree 1 and robust passive systems. The importance of the feedback equivalence theorem is illustrated by solving the problems of global robust stabilization theorems developed in this paper neither reequire matching condition nor constraint the growth of the structural uncertainties.

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