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Type-2 fuzzy controller design using a sliding-mode approach for application to DC-DC converters

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4 Author(s)
Lin, P.-Z. ; Dept. of Electr. & Control Eng., Nat. Chiao-Tung Univ., Taiwan, Taiwan ; Lin, C.-M. ; Hsu, C.-F. ; Lee, T.-T.

Fuzzy controllers and fuzzy sliding-mode controllers have found extensive use in a variety of applications. Generally, type-1 fuzzy sets are used for the membership functions of these controllers. However, in real-time applications, uncertainty associated with the available information always occurs. A type-2 fuzzy controller and a type-2 fuzzy sliding-mode controller are proposed that are able to solve the problem that the words used in the inference rules can mean different things to different people. Since the membership functions use type-2 fuzzy sets then, the proposed control schemes can handle the rule uncertainties when the operation is extremely uncertain and/or the membership grades cannot be exactly determined. The proposed control systems are applied to control a buck DC-DC converter. A comparison between a PI controller, a type-2 fuzzy controller and a type-2 fuzzy sliding-mode controller is made. The experimental results show that the type-2 fuzzy sliding-mode controller achieves the best control performance.

Published in:

Electric Power Applications, IEE Proceedings -  (Volume:152 ,  Issue: 6 )