A Non-Isolated Bidirectional DC-DC Converter Connected to the T-Type Three Level Converter for Electric Vehicle Battery Charger

In this article, a non-isolated bidirectional DC-DC converter for electric vehicle (EV) battery charging is connected to a T-type three-level converter using a DC link. The number of switches in the T-type three-level converter has been reduced. The output and input terminals of this converter have common ground. The converter offers good efficiency, low voltage stress on switches, and a good power factor (PF). This converter is controlled by carrier-based sinusoidal pulse width modulation (CBPWM) and space-vector pulse width modulation (SVPWM). Vehicles are connected to the grid (V2G) and the grid is connected to the vehicle (G2V) using the proposed converter to provide bidirectional power flow on three-phase 380V and 50Hz power grids. The results obtained from the theoretical analysis prove an efficiency of 96.9% for an output power of 15800W and a total harmonic distortion (THD) equal to 3.06% for the EV charger. In discharge mode, efficiency is 96.5% for 500W output power.