Solar based grid integrated EV charging station with energy storage system

Abstract

Solar energy is not a constant source of energy, it keeps fluctuating every hour of day, month and season throughout the year. So, to harness maximum power from PV system proper MPPT technique is required. Also, solar energy cannot be present in night time, and will be less in rainy weather a proper energy storage system is required to store the energy from PV panel and make use of it when needed. This paper presents a solar based grid connected EV DC charging system with battery storage system. Since charging station needs to run day and night whereas PV system cannot provide energy at night, so grid connection is used to maintain continuous flow of energy. The idea is when battery run out of power grid will supply power to charging station and when there is surplus power available in battery it will feed back to grid. Thus, bidirectional flow of energy is maintained. Also, the solar PV and EV charging system provide necessary inertia support to grid for its stability. All the simulation are carried out in MATLAB SIMULINK and results are verified.