A Solar PV Based Smart EV Charging System with V2G Operation for Grid Support

This paper presents a solar photovoltaic (PV) based electric vehicle (EV) charging system with the ability to charge the EV battery storage system and with vehicle to grid (V2G) operation to support power grid. The charging system consists of a solar PV array with a single-ended primary-inductor converter (SEPIC) DC-DC converter, a bidirectional DC-DC converter for EV battery charging and three-level inverter with LCL filter for grid interface and associated controllers. The SEPIC converter is controlled with maximum power point tracking algorithm to extract maximum power from solar PV array and charge EV battery through a bidirectional DC-DC converter and controller. The designed controllers are capable to provide uninterrupted charging and grid support to enhance grid performance under disturbance and variable PV generation. The charger is also enabled with V2G power transfer for active and reactive power support and enhancement of fault ride through capability for the distribution grid with renewable energy sources. The proposed system is implemented in MATLAB/Simscape environment and results confirm that the proposed solar PV based EV charging system can charge the EV and provide grid support under varying irradiance and grid disturbances.