A bi-directional DC-DC converter with overlapping input and output voltage ranges and vehicle to grid energy transfer capability

Author

Khan, Mehnaz Akhter ; Husain, Iqbal ; Sozer, Yilmaz

Author_Institution

ECE, North Carolina State Univ., Raleigh, NC, USA

fYear

2012

fDate

4-8 March 2012

Firstpage

1

Lastpage

7

Abstract

A bi-directional buck-boost DC-DC converter is presented for vehicle charging as well as vehicle to grid (V2G) energy transfer. The chosen cascaded buck-boost topology allows overlapping input and output voltage ranges and a higher intermediate DC bus voltage where the electric drivetrain traction inverter can be connected. The intermediate DC-link capacitor voltage is varied to improve the transient performance of the converter. The reference voltage of this capacitor is set based on the input and output voltage levels, and the power demand. Experimental results have shown that with its modularity, control flexibility and transient performance the converter is a viable candidate for vehicle-to-grid energy transfer.

Keywords

DC-DC power convertors; battery powered vehicles; electric drives; invertors; power capacitors; power grids; power system transients; traction; V2G energy transfer capability; bidirectional buck-boost DC-DC converter; capacitor reference voltage; cascaded buck-boost topology; converter transient performance improvement; electric drivetrain traction inverter; higher intermediate DC bus voltage; input voltage level; intermediate DC-link capacitor voltage; output voltage level; overlapping input voltage range; overlapping output voltage range; power demand; vehicle charging; vehicle to grid energy transfer capability; Batteries; Capacitors; Inductance; Inductors; Switches; Topology; Vehicles;

fLanguage

English

Publisher

ieee

Conference_Titel

Electric Vehicle Conference (IEVC), 2012 IEEE International

Conference_Location

Greenville, SC

Print_ISBN

978-1-4673-1562-3

Type

conf

DOI

10.1109/IEVC.2012.6183258

Filename

6183258