Leg-Shared System Integrating Grid-Connected Photovoltaic and Dynamic Wireless Power Transfer

By combining dynamic wireless power transfer (DWPT) for charging electric vehicles (EVs) with the miniaturization of onboard batteries, it is possible to reduce the size of onboard batteries and extend their driving range, thereby suppressing CO<sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sub> emissions generated during EV manufacturing. Furthermore, sourcing the power supply for EVs from photovoltaics (PV) can significantly contribute to achieving carbon neutrality. This paper proposes a PV+DWPT system combining a grid-connected PV system with a DWPT system. However, challenges remain, such as the DWPT system being usable only while the vehicle is in motion, and the power grid having to adjust to the fluctuating power from the PV. Therefore, the proposed system improves the overall circuit utilization rate by sharing the legs of the DC–DC Converter used for PV and the Full-Bridge Inverter used for DWPT. Furthermore, it reduces the burden on the power grid by using an Electric Double-Layer Capacitor (EDLC). The proposed system was verified through a bench-scale experiment using three transmitting coils and one receiving coil. The results demonstrate a maximum power point tracking (MPPT) efficiency of 85.2% under fluctuating irradiance and a DWPT transmission efficiency of 81.2%. These findings confirm the effectiveness of the proposed system in ensuring a stable power supply and reducing grid impact, thereby demonstrating its potential for sustainable transportation infrastructure.