Novel Output Regulation Method for Three-phase Three-level Wireless EV Charging System

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Original languageEnglish
Article number8000207
Number of pages7
Journal / PublicationIEEE Transactions on Magnetics
Issue number2
Online published17 May 2021
Publication statusPublished - Feb 2022


Three-phase wireless power transfer (WPT) systems have compact coil structures, canceled triplen harmonics, and less dc-link current ripple, which are suitable for wireless electric vehicle (EV) charging systems. Most three-phase WPT systems are based on two-level inverters. Alternately, three-level inverters have the potential to further promote the performance of EV chargers by reducing electromagnetic interference (EMI) and the voltage stress of power switches. However, the unbalance of the neutral point voltage is a problem for traditional three-level inverters. This paper proposes a three-level three-phase WPT system for EV wireless charging, which is based on a T-type neutral point clamp (TNPC) inverter. The modeling, coil structure, and switching pattern of the proposed system are analyzed in detail. Furthermore, a novel output regulation method based on vector control is proposed for the WPT system. Also, a neutral point voltage balance strategy is proposed to enhance the reliability of the three-level inverter. Both simulations and an experimental prototype based on SIC-MOSFET are given to verify the effectiveness of the proposed three-phase WPT system and control method.

Research Area(s)

  • Capacitors, Electric vehicle (EV) charger, EV charger, Inductance, Inverters, Switches, three-level (TL) inverter, three-phase inverter, TNPC inverter, Topology, Wireless communication, wireless power transfer (WPT), T-type neutral point clamp (TNPC) inverter