POWER DEMAND REDUCTION IN ELECTRIC VEHICLE CHARGING

Abstract

Due to rising fossil fuel prices and accelerating carbon dioxide (CO2) emissions, the use of electric vehicles (EVs) has grown over the past few years. At present EV charging stations use the existing utility power grid, and hence there is an increase in load demand at the distribution side and thereby stress on the utility grid. There are different solutions for this problem, mainly PV integration, Power factor correc tion (PFC) in chargers, managed charging, indirect power demand reduction, etc. For a level 1 EV charging, AC to DC conversion and also its power factor correction is necessary. There are multiple problems with the diode bridge rectifier used in typical chargers, notably conduction loss and nonlinear characteristics. Bridge rec tifiers with input diodes operate poorly, are inefficient, and also have a low power factor. This project focuses on important EV power demand reduction strategies like PFC, charging with on-site renewable energy, and indirect power demand re duction. This project make use of a novel Cuk-SEPIC converter with fuzzy logic control for PFC and calculating its power factor.This topology is compared with two other converter topologies (Cuk-push-pull, and Cuk-flyback). All these con verters are designed to work in discontinuous conduction mode. The Cuk-SEPIC converter is the integration of both Cuk and SEPIC converters in which the Cuk converter works in the positive half and the SEPIC converter works in the negative half cycle. The next objective is the integration of PV in level 2 charging along with its design, cost analysis, and simulations for reducing power demand on the grid