Grid to vehicle and vehicle to grid energy transfer using single-phase half bridge boost AC-DC converter and bidirectional DC - DC converter

A system configuration based on a single-phase unity power factor (PF) half-bridge boost converter and bidirectional DC-DC converter based energy transfer from electrical vehicle to grid(V2G) and grid to vehicle (G2V) is proposed with detailed analysis. The efficiency of this conversion system is high because there is only one series semiconductor on-state voltage drop at any instant. The analytical results are verified through simulation using switched and averaged circuit models of the system at 230V AC input and DC output. The simulation result demonstrates an improved power factor at AC mains. In the second stage, a bidirectional buck–boost DC-DC converter is used to charge and discharge the battery of the PHEV (Plug-in Hybrid Electric Vehicle). In discharging mode, it delivers energy back to the grid at 230V, 50 Hz. A battery with the charging power of 3.6 kW at 240V is used in PHEV. The buck-boost DC-DC converter is used in buck mode to charge and in a boost mode to discharge the battery.