Phase Shift Regulation Method of Electric-Field Coupling Bidirectional Wireless Power Transfer Under Variation of Coupling Capacitance

Electric-field coupled bidirectional wireless power transfer system is suitable for grid, electric vehicles or battery storage devices, enabling energy interaction between them. In the practical application of EC-BWPT technology, the transmission performance of the system is largely affected by the coupling capacitance, and the misalignment of the coupling plate are unavoidable. This paper proposes a dual phase-shifting control method to achieve system tuning by adjusting the relative phase angle under variation of the coupling capacitance. Then, the desired power is obtained by adjusting the internal phase angle of the receiver converter. The coupling tuning and power flow regulation strategy based on phase-shifting control achieves modulation of power flow. Finally, the effectiveness of the proposed coupling tuning and power flow phase-shifting control strategy was verified by simulation.