Voltage Balancing of a 320-V, 12-F Electric Double-Layer Capacitor Bank Combined With a 10-kW Bidirectional Isolated DC--DC Converter

Electric 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, industria...

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Bibliographic Details
Published in:IEEE transactions on power electronics 2008-11, Vol.23 (6), p.2755-2765
Main Authors: Tan, N.M.L., Inoue, S., Kobayashi, A., Akagi, H.
Format: Article
Language:English
Subjects:
Alternative energy sources
Applied sciences
Banks
Batteries
Bidirectional
Bidirectional isolated dc > dc converter
Capacitors
Capacitors. Resistors. Filters
Charging
Circuit properties
Circuits
Construction industry
Devices
Dielectric, amorphous and glass solid devices
Electric currents
electric double-layer capacitor (EDLC)
Electric potential
Electric power
Electric power generation
Electric, optical and optoelectronic circuits
Electrical engineering. Electrical power engineering
Electronic circuits
Electronics
Exact sciences and technology
Experiments
Flywheels
Power electronics, power supplies
Power engineering
Pulsed power supplies
Renewable energy resources
Semiconductor electronics. Microelectronics. Optoelectronics. Solid state devices
Signal convertors
Supercapacitors
Various equipment and components
Voltage
voltage balancing
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Summary:Electric 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.
ISSN:0885-8993
1941-0107
DOI:10.1109/TPEL.2008.2005388