A Combined Hard and Soft Variable-Structure Control Scheme for a Class of Nonlinear Systems
Juhng-Perng Su; Ting-En Lee; Ker-Wei Yu
Industrial Electronics, IEEE Transactions on
Volume 56, Issue 9, Sept. 2009 Page(s):3305 - 3313
Digital Object Identifier   10.1109/TIE.2009.2023634
Summary:This paper presents a novel variable-structure-based control scheme for nonlinear systems. First, a hard variable-structure control is constructed for achieving a uniform ultimate boundedness control. Then, a soft variable-structure control using fuzzy logic is incorporated to help improve dynamic responses when trajectories enter into the ultimate bound. For practical consideration, we added a genetic-algorithm-based alpha-beta filter in front of the fuzzy controller to suppress noise and obtain smooth input signals. For comparison purposes, an inverted pendulum system was first used as a simulated example to demonstrate the effectiveness of the design. Then, the performance of the control scheme was practically tested with an experimental PC-based magnetic levitation system. The simulation and experimental results strongly suggest that the newly proposed control scheme is encouraging for practical applications.

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