A Bidirectional DC-DC Converter for an Energy Storage System With Galvanic Isolation

• Published in: IEEE transactions on power electronics Vol. 22; no. 6; pp. 2299 - 2306
• Main Authors: Inoue, S., Akagi, H.
• Format: Journal Article
• Language: English
• Published: New York, NY IEEE 01-11-2007; Institute of Electrical and Electronics Engineers; The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
• Subjects: Applied sciences; Bidirectional; Bidirectional isolated dc-dc converter; Choppers; Circuit properties; Circuits; Converters; Current measurement; DC-DC power converters; Devices; Dielectric, amorphous and glass solid devices; Direct energy conversion and energy accumulation; electric double layer capacitors; Electric potential; Electric power; Electric, optical and optoelectronic circuits; Electrical engineering. Electrical power engineering; Electrical power engineering; Electronic circuits; Electronics; Energy accumulation; Energy storage; energy storage system; Exact sciences and technology; Galvanizing; loss analysis; Loss measurement; Mathematical models; Measurement; Power electronics, power supplies; Power measurement; Semiconductor electronics. Microelectronics. Optoelectronics. Solid state devices; Signal convertors; starting procedure; Supercapacitors; Voltage; Bidirectional link; Bidirectional isolated dc-dc converter; Direct current convertor; Choppers (circuits); Storage system; Power capacitor; starting procedure; Energy storage system; Experimental study; electric double layer capacitors; DC-DC power convertors; Current limiter; Power losses; loss analysis; Double layers; Energy storage
• ISSN: 0885-8993; 1941-0107
• DOI: 10.1109/TPEL.2007.909248

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.