Power Stabilization of Dynamic Wireless Power Transfer System with Grid-connected Photovoltaic and DC Bus Voltage Control

Dynamic Wireless Power Transfer (DWPT), which has been attracting attention in recent years, is a system that solves the problems of Electric Vehicles (EVs), such as long charging times and short cruising ranges. This study proposes a system for local production and local consumption of electricity by using grid-connected photovoltaic (PV) as an energy source for DWPT. When the PV is generating excess power compared to the electricity demand, the power is returned to the grid. When the PV is not generating enough power, the grid subsidizes the shortage. In this way, the DCbus voltage can be maintained at a constant level, enabling a stable supply of power to the EV on the demand side. The effectiveness of the proposed system was verified using circuit analysis software (MATLAB/Simulink), which enables stable DWPT while performing maximum power point tracking (MPPT) control of the PV panels and DCbus voltage control using a Dual Active Bridge (DAB) converter connected to the Grid side. The results show that the DCbus voltage can be controlled within plus or minus 1 percent of the target value regardless of the fluctuating PV and the coupling coefficient between the transmission and receiving coils, and the power conversion efficiency of the DWPT was up to 70 percent. Thus, the proposed system was found to be effective and feasible.