Hot-Swappable Modular Converter System Control for Heterogeneous Batteries and ESS

Dae-Seak Cha, Jung-Sik Choi, Seung-Yeol Oh, Hyun-Jin Ahn and Young-Cheol Lim
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Dae-Seak Cha: Korea Electronics Technology Institute 226, Cheomdangwagi-ro, Buk-gu, Gwangju 61011, Korea
Jung-Sik Choi: Korea Electronics Technology Institute 226, Cheomdangwagi-ro, Buk-gu, Gwangju 61011, Korea
Seung-Yeol Oh: Korea Electronics Technology Institute 226, Cheomdangwagi-ro, Buk-gu, Gwangju 61011, Korea
Hyun-Jin Ahn: Department of Electrical Engineering, Chonnam National University, Gwangju 61186, Korea
Young-Cheol Lim: Department of Electrical Engineering, Chonnam National University, Gwangju 61186, Korea

Energies, 2018, vol. 11, issue 2, 1-19

Abstract: This study proposes a modular bidirectional converter system for hot-swappable energy storage systems (ESSs). The proposed modular converter has a four-leg interleaved structure, and therefore it can reduce input current ripples and is suitable for secondary cells. Moreover, if any of the legs fails, hot-swap is available through phase control inside the converter. The modular converter uses an independently controllable battery as an input power source, allowing the charge and discharge control according to each stated of charge (SOC). The output voltage of the converter circumvents the module in the event of a high-voltage output control and a fault (exchange due to battery life, repair of converter) through the cascade-type bypass, thereby enabling continuous operation. The hot-swap operation of the proposed modular ESS converter system and the charge and discharge control algorithm according to battery SOC are verified by experiment.

Keywords: energy storage system; hot-swap; modular converter; power conversion; interleaved; bidirectional dc-dc converter (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2018
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (1)

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