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		Ruiquan LIN,Fuwen YANG,Renchong PENG.[en_title][J].Control Theory and Technology,2009,7(2):169~.[Copy]

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RuiquanLIN,FuwenYANG,RenchongPENG
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Received:April 10, 2007Revised:May 22, 2008

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Observer-based H-infinity output feedback control with feedback gain and observer gain variations for Delta operator system

Ruiquan LIN, Fuwen YANG, Renchong PENG

(College of Electrical Engineering and Automation, Fuzhou University, Fuzhou Fujian 350002, China)

Abstract:

Considering that the controller feedback gain and the observer gain are of additive norm-bounded variations, a design method of observer-based H-infinity output feedback controller for uncertain Delta operator systems is proposed in this paper. A sufficient condition of such controllers is presented in linear matrix inequality (LMI) forms. A numerical example is then given to illustrate the effectiveness of this method, that is, the obtained controller guarantees the closed-loop system asymptotically stable and the expected H-infinity performance even if the controller feedback gain and the observer gain are varied.

Key words: Observer Delta operator system Robust control Output feedback LMI