AN OFF BOARD SOLAR EV CHARGER USING HIGH GAIN BDC AND SEPIC CONVERTER

Abstract

The urge for sustainable transportation is increasing the demand for electric vehicles progressively. The main concern related to the usage of electric vehicles is that it may drastically increase the load demand on the grid. The erratic demand and the use of grid connected converters cause various power quality problems in the grid. A sustainable solution to override the various issue is renewable energy, especially solar photo voltaic based EV charging stations. This project introduces a novel photovoltaic integrated off-board electric vehicle battery charger. It is a system capable of operating in both sunshine and non-sunshine hours. It can be realised with the help of a SEPIC converter, a High Gain Bidirectional Buck-Boost converter and a Backup Battery bank. Also, to extract maximum power from the available station area and thereby improve the PV conversion efficiency, it uses integrated MPPT. A realistic model of the proposed system is designed and simulated in MATLAB SIMULINK in this project. And various proposed modes of operations for different irradiance conditions are verified for the system. The results show that the proposed charging system is capable of powering up EVs irrespective of the availability of sunshine. Finally, a comparative performance analysis of the proposed EV battery charging system using P & O and INC-MPPT techniques is verified