LCC-S Based Discrete Fast Terminal Sliding Mode Controller for Efficient Charging through Wireless Power Transfer

Naghmash Ali, Zhizhen Liu, Yanjin Hou, Hammad Armghan, Xiaozhao Wei and Ammar Armghan
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Naghmash Ali: School of Electrical Engineering, Shandong University, Jinan 250061, China
Zhizhen Liu: School of Electrical Engineering, Shandong University, Jinan 250061, China
Yanjin Hou: Energy Institute, Qilu University of Technology (Shandong Academy of Sciences), Shandong Provincial Key Laboratory of Biomass Gasification Technology, Jinan 250353, China
Hammad Armghan: School of Electrical Engineering, Shandong University, Jinan 250061, China
Xiaozhao Wei: School of Electrical Engineering, Shandong University, Jinan 250061, China
Ammar Armghan: Department of Electrical Engineering, Jouf University, Al-Jawf, Saudi Arabia

Energies, 2020, vol. 13, issue 6, 1-18

Abstract: Compared to the plug-in charging system, Wireless power transfer (WPT) is simpler, reliable, and user-friendly. Resonant inductive coupling based WPT is the technology that promises to replace the plug-in charging system. It is desired that the WPT system should provide regulated current and power with high efficiency. Due to the instability in the connected load, the system output current, power, and efficiency vary. To solve this issue, a buck converter is implemented on the secondary side of the WPT system, which adjusts its internal resistance by altering its duty cycle. To control the duty cycle of the buck converter, a discrete fast terminal sliding mode controller is proposed to regulate the system output current and power with optimal efficiency. The proposed WPT system uses the LCC-S compensation topology to ensure a constant output voltage at the input of the buck converter. The LCC-S topology is analyzed using the two-port network theory, and governing equations are derived to achieve the maximum efficiency point. Based on the analysis, the proposed controller is used to track the maximum efficiency point by tracking an optimal power point. An ultra-capacitor is connected as the system load, and based on its charging characteristics, an optimal charging strategy is devised. The performance of the proposed system is tested under the MATLAB/Simulink platform. Comparison with the conventionally used PID and sliding mode controller under sudden variations in the connected load is presented and discussed. An experimental prototype is built to validate the effectiveness of the proposed controller.

Keywords: wireless power transfer; non-linear; fast terminal sliding mode control; power converters (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: 2020
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (4)

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