This paper proposes a three-phase wireless power transfer (WPT) system with a three-phase-to-three-phase matrix converter. The proposed system directly converts power from an AC grid to high-frequency AC for WPT. The three-phase WPT system with the matrix converter is effectively expands the lifetime of the WPT system. A novel hybrid commutation method, which is suitable for the WPT system with a resonant characteristic, is proposed to avoid the commutation failure of the matrix converter. The strategy of the proposed hybrid commutation is based on an estimation of the current direction considering the resonant characteristics and elimination of commutation in the critical area. The proposed commutation method achieves an AC input-current total harmonic distortion (THD) of 4.7% with the resonant three-phase load without a current sensor on the high-frequency side. Furthermore, the proposed WPT system achieves a system efficiency of 88.2% at a load of 4 kW.

中文翻译：

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使用矩阵变换器的三相无线供电系统

本文提出了一种具有三相到三相矩阵转换器的三相无线电力传输 (WPT) 系统。拟议的系统直接将交流电网的电力转换为 WPT 的高频交流电。具有矩阵转换器的三相WPT系统有效地延长了WPT系统的寿命。为了避免矩阵变换器的换相失败，提出了一种适用于具有谐振特性的WPT系统的新型混合换相方法。所提出的混合换向策略是基于对电流方向的估计，考虑到关键区域的谐振特性和换向消除。所提出的换向方法实现了 4 的交流输入电流总谐波失真 (THD)。高频侧没有电流传感器的谐振三相负载为 7%。此外，所提出的 WPT 系统在 4 kW 负载下实现了 88.2% 的系统效率。