DocumentCode :
3737357
Title :
A bipolar-DC-bus EV fast charging station with intrinsic DC-bus voltages equalization and minimized voltage ripples
Author :
Longcheng Tan;Bin Wu;Sebastian Rivera
Author_Institution :
Department of Electrical and Computer Engineering, Ryerson University, 350 Victoria St, Toronto, Ontario, Canada, M5B 2K3
fYear :
2015
Firstpage :
2190
Lastpage :
2195
Abstract :
This paper proposes a bipolar-dc-bus Electric Vehicle (EV) charging station without a line-frequency transformer at the medium-voltage grid side. It is mainly composed of the Neutral Point Clamped (NPC) converter based central ac-dc station and the parallel isolated three-level dc-dc converter based fast chargers. Due to the elimination of the line-frequency transformer, the volume and cost of the system are reduced. Meanwhile, the isolation and step-down between high dc-bus voltages and low load voltages are performed through the high-frequency transformers, leading to increased voltage utilization of switching devices. In order to guarantee the bipolar dc buses balance and minimize the dc-bus voltage ripples, the 180°-interleaved operation for the two parallel isolated three-level dc-dc converters is proposed to make the total neutral-point current zero so that all fast chargers do not bring any unbalance problems. The proposed 180°-interleaved operating principle has been analyzed in detail, then simulation results are presented to verify its performance.
Keywords :
"Charging stations","DC-DC power converters","Batteries","Performance evaluation","Switches","Stress","Capacitors"
Publisher :
ieee
Conference_Titel :
Industrial Electronics Society, IECON 2015 - 41st Annual Conference of the IEEE
Type :
conf
DOI :
10.1109/IECON.2015.7392426
Filename :
7392426
Link To Document :
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