Roof Top Solar PV Supported Electric Vehicle Charging System for Home Parking Spaces

Abstract

An electric vehicle (EV) charging system utilizing rooftop solar photovoltaic (PV) energy and supported with a battery energy storage (BES) system and single-phase grid is presented in this work for the home parking spaces. The presented charging system incorporates AC charging functionality for the EV onboard charging system and supports DC charging port for the fast and effective charging of vehicles. It is noteworthy that the DC charging ports of the presented system incorporate a wide voltage range capability, i.e., 50 – 400 V, to ensure fast and effective charging of different classes of EVs, such as two-wheelers (2W), three-wheelers (3W), and four-wheelers (4W), parked at home parking space. The charger incorporates two DC charging ports for wide voltage range capability, one with a high gain bidirectional DC-DC converter for low voltage battery packs and another one for high voltage battery packs. Apart from vehicle charging functionality, the presented charging system has the capability to fulfill the demand of home loads, and therefore, realizes a more reliable supply for the critical home loads. Even if the single-phase AC chargers and critical home loads realize nonlinear operational characteristics, their impact on the grid is completely eliminated, as the grid current is maintained distortion-free at all operating conditions. A high-performance control architecture employing fast and accurate orthogonal signal generator (OSG) is employed to control the AC-DC conversion system of the presented charger. The employed OSG ensures a fast and accurate tracking of grid voltage even under distorted and polluted grid conditions and ensures high-performance characteristics at the grid end. Finally, the overall performance of the charger under various operating modes is examined through software simulation, and results are presented to verify the overall performance of the presented charging system.