Analysis of fast charging topologies of electric vehicles

Abstract

The thesis aims to implement the fast-charging topologies for Electric Vehicles (EVs). Several topologies are denoted as fast-charging topologies; among them, the three-phase three-level neutral point clamped AC/DC rectifier has been chosen. In EV charging systems, there are two parts: AC/DC and DC/DC. The AC-DC part is mainly highlighted in this thesis because the DC-DC part is lossless. Converter analysis combines a double cascade control loop and a modified carrier-based PWM method. From the analysis, Total harmonic distortion (THD), power factor, efficiency, and ripple are estimated to ensure the power quality. Based on the evaluation, the voltage level is maintained. The EV charging standard, on the other hand, is deficient compared to the fast-charging standard. The per-unit method is applied to address the current issues. However, it is not possible to obtain the desired current. So, the proposed rectifier works as a charger instead of a fast charger.