Bidirectional Wireless Power Transfer for High and Low-Voltage EV Charging in a Hybrid Solar-Grid System Using Shared Converter and Magnetic Coupler

This paper proposes a novel bidirectional wireless power transfer (WPT) system for electric vehicle (EV) charging at both high-voltage (HV) and low-voltage (LV) levels within a hybrid solar-grid energy framework. The system integrates a solar photovoltaic (PV) array and grid connection to ensure reliable, efficient, and flexible EV charging. A shared power converter combined with a magnetic coupler enables seamless wireless energy transfer, supporting power flow from grid to EV and EV to EV. The solar PV system employs a DC-DC boost converter with a Perturb and Observe (P&O) maximum power point tracking (MPPT) algorithm to maximize renewable energy extraction under varying environmental conditions. The grid interface utilizes a bidirectional AC-DC voltage source converter controlled through a dq0 reference frame method to regulate active and reactive power, thereby maintaining grid stability, power quality, and frequency synchronization. An auxiliary power module facilitates energy transfer between HV and LV EVs, enhancing operational flexibility and enabling inter-vehicle power sharing. This feature enhances energy flexibility and offers a solution for off-grid or emergency charging scenarios. Simulation results demonstrate the system’s effectiveness in optimizing solar energy use, minimizing grid dependency, and ensuring stable operation under diverse load and generation scenarios. This integrated approach offers a promising solution for sustainable, resilient, and flexible EV charging infrastructure.