Publication: Voltage balancing of a 320-V, 12-F electric double-layer capacitor bank combined with a 10-kW bidirectional isolated DC-DC converter
Date
2008
Authors
Tan N.M.L.
Inoue S.
Kobayashi A.
Akagi H.
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Abstract
double-layer capacitors (EDLCs) have attributes that feature high power density, quick charge/discharge time, long life cycle, and environmental friendliness. These attributes accord for increased appeal in employing the EDLCs as energy-storage devices in renewable energy systems, industrial applications, and hybrid electric vehicles as compared to other mature static energy-storage devices. This paper describes the construction of a 320-V, 12-F EDLC energy-storage bank connected to a bidirectional isolated dc--dc converter. Two types of EDLC bank configurations are considered with emphasis on their voltage-balancing circuits. Subsequently, this paper proposes a voltage-balancing circuit based on a center-tapped transformer, and includes its experimental verifications. It also discusses the charge--discharge and self-starting operation of the EDLC energy-storage system. During the charge--discharge operation, a low ripple current flowing in the EDLC bank is observed, leading to a theoretical analysis. The EDLC bank is also successfully charged to its rated voltage without any external dc charging circuit. � 2008 IEEE.
Description
Keywords
Bidirectional isolated dc-dc converter , Electric double-layer capacitor (EDLC) , Voltage balancing , Automobiles , Capacitance , Capacitors , Control system stability , DC-DC converters , Dielectric devices , Electric automobiles , Electric discharges , Electric network analysis , Electric vehicles , HVDC power transmission , Hybrid systems , Industrial applications , Life cycle , Power converters , A centers , Bidirectional isolated dc-dc converter , Charge/discharge , Dc converters , Double-layer capacitors , Electric double-layer capacitor (EDLC) , Energy-storage systems , Environmental friendliness , Experimental verifications , High power densities , Hybrid electric vehicles , Long lives , Low ripples , Rated voltages , Renewable energy systems , Self-starting , Static energies , Storage devices , Voltage balancing , Voltage-balancing circuits , Renewable energy resources