OPTIMISED MULTISOURCE EV CHARGING STATION WITH GRID VOLTAGE SAG CONTROL

Abstract

The voltage quality is the major issue in the distribution grid due to sudden load changes, elec tric motor starting, a fault occurring in the distribution grid, accidents in the power line, and energizing the transformers. The poor voltage quality directly affects the electric vehicle (EV) charging profile and battery life. A high-quality power supply is required for the proper func tioning of the EV charging system. However, the voltage quality is one of the significant issues in the distribution grid. The proposed system is to reduce the impacts of voltage disturbance on EV batteries and charging systems by providing a dynamic voltage restorer (DVR) to enhance the voltage sag. It protects the EV batteries and charging system from the critical voltage sag levels. A solar Photovoltaic (PV) array with backup battery energy storage (BES) and grid based EV charging station (CS) with voltage sag control is introduced to provide the uninterrupted charg ing in standalone, battery powered and grid connected mode. The charging station is mainly designed to work in solar PV array and a BES to charge the vehicle. The charging station au tomatically draws power from the grid due to the discharge of the storage battery and the lack of solar power. The goal is to ensure that the charging station has a constant and uninterrupted power supply. As a result, an automatic switching control is implemented. The controller will switch the energy source automatically based on the output parameters of the energy sources. As a result, the charging station ensures that the EV is charged continuously.