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

Author

Listed:
  • 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)

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.

Suggested Citation

  • Yao Yuan & Yuan La & Sicheng Shen & Yihui Zhao & Jianchao Li & Fanghui Yin, 2024. "Efficiency Optimization of LCL-Resonant Wireless Power Transfer Systems via Bidirectional Electromagnetic–Thermal Coupling Field Dynamics," Energies, MDPI, vol. 17(17), pages 1-16, September.
    • Handle: RePEc:gam:jeners:v:17:y:2024:i:17:p:4507-:d:1473908
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