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		Ruiquan LIN,Fuwen YANG,Qiugang CHEN.[en_title][J].Control Theory and Technology,2007,5(4):404~408.[Copy]

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RuiquanLIN,FuwenYANG,QiugangCHEN
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Received:July 20, 2006Revised:February 27, 2007

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Design of robust non-fragile H-infinity controller based on Delta operator theory

Ruiquan LIN, Fuwen YANG, Qiugang CHEN

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

Abstract:

Considering that the controller parameters are of additive norm-bounded uncertainties when realized, a design method of robust non-fragile H-infinity controller for uncertain system based on Delta operator theory is illustrated in this paper. A sufficient and necessary condition of the existence for the controller is given, which is presented in LMI forms. Finally, the designed method is used in the speed control system of permanent magnet linear synchronous motor (PMLSM). With the designed controller, the resulted speed closed-loop system is still stable and has the expected Hinfinity performance even if the sample period is reduced and the parameters of the controller and the controlled object are of variations. The results show that the designed method is effective.

Key words: Delta operator Non-fragile control LMI PMLSM