Dual Matrix Converter Based Wireless Power Transfer System

This article introduces a dual matrix converter-based wireless power transfer system for three-phase loads. The proposed system enables direct ac–ac power conversion, eliminating the need for bulky and short-lifetime electrolytic capacitors, thereby enhancing power density and reliability. In addition, the article explores modulation strategies for the proposed structure. Various modulation waveforms are compared and analyzed, revealing that antisymmetric and periodic flip modulations can mitigate phase-shift effects on the system’s total harmonic distortion (THD) performance, maintaining stable THD levels over a wide load range. Through Fourier analysis, it is observed that the fundamental components of antisymmetric and periodic flip waveforms are symmetric during a switching period. Leveraging this symmetry, an improved dwell time calculation method is proposed to reduce THD values for both grid-side and load-side currents. Finally, a prototype is constructed to validate the theoretical analysis, achieving a maximum efficiency of 93.3% and a minimum THD of 1.11%.