Design and Performance of a Bidirectional Isolated DC–DC Converter for a Battery Energy Storage System

Author

Tan, Nadia Mei Lin ; Abe, Takahiro ; Akagi, Hirofumi

Author_Institution

Dept. of Electr. Power Eng., Univ. Tenaga Nasional, Kajang, Malaysia

Volume

27

Issue

3

fYear

2012

fDate

3/1/2012 12:00:00 AM

Firstpage

1237

Lastpage

1248

Abstract

This paper describes the design and performance of a 6-kW, full-bridge, bidirectional isolated dc-dc converter using a 20-kHz transformer for a 53.2-V, 2-kWh lithium-ion (Li-ion) battery energy storage system. The dc voltage at the high-voltage side is controlled from 305 to 355 V, as the battery voltage at the low-voltage side (LVS) varies from 50 to 59 V. The maximal efficiency of the dc-dc converter is measured to be 96.0% during battery charging, and 96.9% during battery discharging. Moreover, this paper analyzes the effect of unavoidable dc-bias currents on the magnetic-flux saturation of the transformer. Finally, it provides the dc-dc converter loss breakdown with more focus on the LVS converter.

Keywords

DC transformers; DC-DC power convertors; battery storage plants; electric breakdown; lithium; magnetic flux; power generation control; power transformers; secondary cells; voltage control; DC-DC converter loss breakdown; DC-bias current; Li; battery energy storage system; efficiency 96.0 percent; efficiency 96.9 percent; frequency 20 kHz; full-bridge bidirectional isolated DC-DC converter; high-voltage side; low-voltage side; magnetic-flux saturation; power 6 kW; transformer; voltage 305 V to 355 V; voltage 50 V to 59 V; Batteries; Bridge circuits; Capacitors; Circuit faults; Converters; MOSFET circuits; Snubbers; Bidirectional isolated dc–dc converters; dc-bias currents; energy storage systems; lithium-ion (Li-ion) battery;

fLanguage

English

Journal_Title

Power Electronics, IEEE Transactions on

Publisher

ieee

ISSN

0885-8993

Type

jour

DOI

10.1109/TPEL.2011.2108317

Filename

5711673