Hundreds kW charging stations for e-buses operating under regular ultra-fast charging

A natural evolution for public transportation vehicles is to develop towards the electric driven buses (e-buses). Batteries weight and volume is still an issue for passenger electric cars. However, the urban bus has interesting characteristics as predefined routes and stops which allow an optimized onboard storage capacity and strategies of Regular Ultra Fast Charging (R-UFC). This way, some hundreds kW charging stations (UFC-Station) may be installed next to the bus boarding stations for providing the R-UFC in e-bus. This paper proposes a power architecture for UFC-stations using the new True Unit Power Factor (TUPF) Rectifier as a charger front-end and interleaved dc-dc converters as charger output. Both technologies contribute significantly to the reduction of filter components and assure high power quality standards. The proposed TUPF rectifier eliminates all harmonic order up to 50th, operates with low switching frequency and does not use sinusoidal filter. The UFC-stations are explained and evaluated based on computer simulations of a 400 kW application.