Technical Communique: A dynamic output feedback controllers for mismatched uncertain variable structure systems

Authors:
Kuo-Kai Shyu;Yao-Wen Tsai;Chiu-Keng Lai
Affiliations:
Department of Electrical Engineering, National Central University, Chung-Li, Taiwan 32054, ROC;Department of Electronic Engineering, Kuang Wu Institute of Technology, Peitou, Taipei 112, Taiwan ROC;Department of Electrical Engineering, National Central University, Chung-Li, Taiwan 32054, ROC
Venue:
Automatica (Journal of IFAC)
Year:
2001

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Abstract

This paper proposes a dynamic output feedback controllers for variable structure systems. It is based on the concept of output feedback controllers, introduced by Zak and Hui (IEEE Trans. Automat. Control AC-38 (1993) 1509) and Kwan (IEEE Trans. Automat. Control AC-41 (1996) 1691) for matched uncertain variable structure systems in which the state is unavailable and no estimated state is required. In this paper, we extend this idea to a class of mismatched uncertain variable structure systems. A modified variable structure controllers is derived to guarantee the existence of the sliding mode by using output feedback only. The stability of the equivalent reduced-order system in the sliding mode is assured under certain conditions.