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Energies 2018, 11(2), 309; https://doi.org/10.3390/en11020309

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

1
Korea Electronics Technology Institute 226, Cheomdangwagi-ro, Buk-gu, Gwangju 61011, Korea
2
Department of Electrical Engineering, Chonnam National University, Gwangju 61186, Korea
*
Author to whom correspondence should be addressed.
Received: 26 December 2017 / Revised: 29 January 2018 / Accepted: 30 January 2018 / Published: 1 February 2018
(This article belongs to the Section Energy Storage and Application)
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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. View Full-Text
Keywords: energy storage system; hot-swap; modular converter; power conversion; interleaved; bidirectional dc-dc converter energy storage system; hot-swap; modular converter; power conversion; interleaved; bidirectional dc-dc converter
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).
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Cha, D.-S.; Choi, J.-S.; Oh, S.-Y.; Ahn, H.-J.; Lim, Y.-C. Hot-Swappable Modular Converter System Control for Heterogeneous Batteries and ESS. Energies 2018, 11, 309.

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