Solar Assisted Residential EV Charging System with Price Adaptive Control

In this article, a cost effective electric vehicle (EV) fast charging scheme for a single phase residential system is being presented. The grid connected residential setup comprises of a solar photovoltaic (PV) array, two EVs, voltage source converter (VSC) and home loads. The proposed algorithm has multi-purpose benefits: it enables fast EV charging during low electricity prices time block, while allowing the EVs to discharge during sudden price hikes when prices exceed an adaptive price threshold set for the day obtained from day-ahead price scheduling. At night, during high tariffs, the EV operates in vehicle to home (V2H) mode, thus achieving two fold purpose of cost minimization and grid stress alleviation which helps in prevention of power interruptions. Sinusoidal reference grid currents are generated using the least lncosh algorithm based adaptive control algorithm. The system is verified by simulation results depicting various operating conditions.