Adaptive Second-Order Sliding Mode Control of Buck Converters with Multi-Disturbances

Yanmin Wang, Weiqi Zhang, Yalong Yang, Chen Xue, Shibo Yuan and Hanqing Zhang
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Yanmin Wang: School of Electrical Engineering and Automation, Harbin Institute of Technology, Harbin 150001, China
Weiqi Zhang: School of Electrical Engineering and Automation, Harbin Institute of Technology, Harbin 150001, China
Yalong Yang: Key Laboratory of Intelligent Building & Building Energy Saving, Anhui Jianzhu University, Hefei 230000, China
Chen Xue: School of Electrical Engineering and Automation, Harbin Institute of Technology, Harbin 150001, China
Shibo Yuan: School of Electrical Engineering and Automation, Harbin Institute of Technology, Harbin 150001, China
Hanqing Zhang: School of Electrical Engineering and Automation, Harbin Institute of Technology, Harbin 150001, China

Energies, 2022, vol. 15, issue 14, 1-19

Abstract: In this paper, a novel adaptive second-order sliding mode (2-SM) control approach, based on online zero-crossing detection, was proposed to solve the problems of the chattering and fixed control gain for buck converters with multi-disturbances. In modeling, the possible parameter perturbations and external disturbances of the converter system were contained. Instead of the traditional first-order sliding mode (1-SM), the twisting algorithm with 2-SM was adopted for the controller design, which could overcome the chattering problem and realize control continuity. Meanwhile, a novel adaptive mechanism was introduced to replace the conventional fixed control gain by time-varying control gain, the idea of which is to calculate the number of the zero-crossing points of the sliding surface online. As a result, the control magnitude of the improved controller could be reduced to a minimal admissible level, and the steady error of the output voltage could converge to the expected value. Furthermore, the robust stability of the converter system with multi-disturbances wads investigated. Comparative simulations and experiments validated the advantages of this paper as offering better robustness and control performance.

Keywords: sliding mode control; adaptive control; buck converter; second-order sliding mode; zero-crossing detection; robustness; stability (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2022
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