Title :
A Bidirectional DC–DC Converter for an Energy Storage System With Galvanic Isolation
Author :
Inoue, Shigenori ; Akagi, Hirofumi
Author_Institution :
Tokyo Inst. of Technol., Tokyo
Abstract :
This paper addresses a bidirectional dc-dc converter suitable for an energy storage system with an additional function of galvanic isolation. An energy storage device such as an electric double layer capacitor is directly connected to a dc side of the dc-dc converter without any chopper circuit. Nevertheless, the dc-dc converter can continue operating when the voltage across the energy storage device drops along with its discharge. Theoretical calculation and experimental measurement reveal that power loss and peak current impose limitations on a permissible dc-voltage range. This information may be useful in design of the dc-dc converter. Experimental results verify proper charging and discharging operation obtained from a 200-V, 2.6-kJ laboratory model of the energy storage system. Moreover, the dc-dc converter can charge the capacitor bank from zero to the rated voltage without any external precharging circuit.
Keywords :
DC-DC power convertors; choppers (circuits); energy storage; bidirectional dc dc converter; chopper circuit; electric double layer capacitor; energy 2.6 kJ; energy storage system; galvanic isolation; peak current; permissible dc voltage range; power loss; voltage 200 V; Choppers; Circuits; Current measurement; DC-DC power converters; Energy storage; Galvanizing; Loss measurement; Power measurement; Supercapacitors; Voltage; Bidirectional isolated dc-dc converter; electric double layer capacitors; energy storage system; loss analysis; starting procedure;
Journal_Title :
Power Electronics, IEEE Transactions on
DOI :
10.1109/TPEL.2007.909248
