DESIGN AND ANALYSIS OF BIDIRECTIONAL CHARGERS FOR ELECTRIC VEHICLES

Abstract

Concerns about climate change and the depleting nature of fossil fuels have attracted attention of researchers toward sustainable development in transportation and rise in popularity of electric vehicles (EVs) in recent years. An essential part of electric vehicles is the battery charging system, which has drawn a lot of research interest, especially when it comes to vehicle-to-grid (V2G) power transfer. Integration of renewable energy and helping the grid to achieve peak load levelling is the main goals of vehicle to grid (V2G). With a specific focus on discussion and analysis of single-phase on-board bidirectional chargers. The design, control, and identification of islanding situations in these chargers are the main research areas. This study includes a thorough analysis of two distinct EV charging systems: one that is based on isolated topology and other based on non-isolated topology. The study involves an improved design methodology that precisely evaluates the damping resistor losses and high-frequency current ripple for both converters. The design, modelling, and simulation of the controllers utilized in the two converters are also included in this thesis. This study focuses on a Modified SEPIC bidirectional charger at both 48V volts and 120V with capacity of 1.1kW and a Dual Active Bridge (DAB) converter with different types of phase shift modulation techniques for optimised output. In this thesis we also talk about Battery, its type, characteristics and design parameters.