Improved Power Quality On-Board Integrated Charger with Reduced Switching Stress

In this project, mathematical modelling under various operational modes, analysis and design considerations for the proposed system configuration are presented. There is a consistent demand for reliable, efficient, small-sized, and light weight on-board chargers for vehicular battery charging applications. In view of aforesaid requirements, these chargers are restricted to level-1 and level-2 charging. Therefore, it leads to larger charging time. 

The proposed charger is integrated with propulsion machine drive system that serves to utilize the high power-rated electrical machine and motor-drive voltage source converter to facilitate vehicular battery charging when the vehicle is not running. 

The performance investigations of proposed charging system are carried out for vehicle battery charging under steady state as well as source variations. Furthermore, to ensure power quality features, total harmonic distortions of source voltage and current and input power factor, are monitored. The effectiveness of the proposed strategy is verified by using MATLAB/Simulink.

Keywords: Three-level (TL) converter, integrated battery charger, electric vehicles, interleaved control, state of charge (SOC), single phase charging.