Journal
IEEE TRANSACTIONS ON POWER ELECTRONICS
Volume 37, Issue 1, Pages 137-149Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/TPEL.2021.3093767
Keywords
Supercapacitors; Voltage control; Computer architecture; Control systems; DC-DC power converters; Capacitors; Transfer functions; Balancing circuit; balancing strategy; charging supercapacitors; DC-DC power converter; power control; supercapacitors
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Funding
- Philippine Commission on Higher Education (CHED)
- Embassy of France through a CHED-PhilFrance Scholarship
- French National Research Agency (ANR) under the Programme d'investissements d'avenir [ANE-ITE-002-01]
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This article proposes a strategy based on a modular architecture to achieve fast charging and balancing of a supercapacitor stack. The strategy takes into account control saturation and voltage differences between supercapacitors, and has been demonstrated through simulation and experimental case studies.
At present, passive balancing methods dominate energy storage applications, however, they suffer from a long balancing duration. In this article, we took advantage of a modular architecture, where several modular power converters replace a central dc-dc converter for fast charging and balancing of a supercapacitor stack. A strategy has been proposed to control how power is shared among the converters during the charging period in order to balance the supercapacitors. However, some converters enter control saturation due to voltage differences between supercapacitors caused by their nonuniform conditions and characteristics. The originality of this article lies in taking into account the saturation by modifying an energy-based strategy to correct the power shares and make balancing the supercapacitors possible. Simulation and experimental case studies were used to demonstrate the strategy's performance and limitations.
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