Efficiency Optimization of LCL-Resonant Wireless Power Transfer Systems via Bidirectional Electromagnetic–Thermal Coupling Field Dynamics

Yao Yuan, Yuan La, Sicheng Shen, Yihui Zhao, Jianchao Li and Fanghui Yin ()
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Yao Yuan: Electric Power Research Institute of China Southern Grid, Guangzhou 510663, China
Yuan La: China Southern Grid, Guangzhou 510663, China
Sicheng Shen: Shenzhen International Graduate School, Tsinghua University, Shenzhen 518055, China
Yihui Zhao: Shenzhen International Graduate School, Tsinghua University, Shenzhen 518055, China
Jianchao Li: Shenzhen International Graduate School, Tsinghua University, Shenzhen 518055, China
Fanghui Yin: Shenzhen International Graduate School, Tsinghua University, Shenzhen 518055, China

Energies, 2024, vol. 17, issue 17, 1-16

Abstract: This paper delved into the thermal dynamics and stability of Wireless Power Transfer (WPT) systems, with a focus on the temperature effects on the coil structure. Using the Finite Element Method (FEM), this study investigated both unidirectional and bidirectional coupling field simulations, assessing their impacts on the transmission efficiency of LCL-resonant WPT systems. The boundary conditions and processes of the electromagnetic–thermal coupling field related to coil loss were analyzed, as well as the dynamic thermal balance in the bidirectional coupling field model. It was found that there is a significant temperature variation across the coil, with the highest temperatures at the central position and the lowest at the edges. This temperature rise notably changed the electrical parameters of the system, leading to variations in its operating state and a reduction in transmission efficiency. A constant coil voltage control strategy was more effective in mitigating the temperature rise compared to a constant coil current strategy, providing valuable insight for enhancing the efficiency and stability of WPT systems.

Keywords: wireless charging system; magnetic coupler; bidirectional magnetic–thermal simulation; finite element calculation (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: 2024
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