Control strategy of bidirectional wireless charging system based on T-type three-level

To mitigate harmonic pollution on the grid side from V2G and wireless charging systems, and to enhance the output power of wireless power transmission systems, we propose incorporating a T-type three-level bidirectional ACDC converter into bidirectional wireless charging equipment, replacing the conventional two-level converter. Building upon the grid-side three-phase T-type three-level bidirectional ACDC converter, we elucidate the operational principles, mathematical modeling, and control strategies of the three-level converter, encompassing SVPWM modulation, currentloop control, bus voltage loop control, and phase-locked loop techniques. Furthermore, we analyze the synchronous control strategy for active and reactive power in the wireless charging and discharging system. Ultimately, we employ MATLAB/Simulink to simulate and analyze the performance of the T-type three-level bidirectional converter. When the electric vehicle is engaged in charging or discharging to the grid, the grid-side current THD is observed to be 1.06% and 3.53% respectively, confirming the viability of the T-type three-level bidirectional AC-DC converter in V2G wireless charging applications.