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

Author

Listed:
  • 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)

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.

Suggested Citation

  • Dae-Seak Cha & Jung-Sik Choi & Seung-Yeol Oh & Hyun-Jin Ahn & Young-Cheol Lim, 2018. "Hot-Swappable Modular Converter System Control for Heterogeneous Batteries and ESS," Energies, MDPI, vol. 11(2), pages 1-19, February.
    • Handle: RePEc:gam:jeners:v:11:y:2018:i:2:p:309-:d:129743
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    References listed on IDEAS

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    1. Hui Liu & Ke Ma & Poh Chiang Loh & Frede Blaabjerg, 2015. "Online Fault Identification Based on an Adaptive Observer for Modular Multilevel Converters Applied to Wind Power Generation Systems," Energies, MDPI, vol. 8(7), pages 1-21, July.
    2. Wen Wu & Xuezhi Wu & Jingyuan Yin & Long Jing & Shuai Wang & Jinke Li, 2017. "Characteristic Analysis and Fault-Tolerant Control of Circulating Current for Modular Multilevel Converters under Sub-Module Faults," Energies, MDPI, vol. 10(11), pages 1-22, November.
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    Cited by:

    1. Jung-Sik Choi & Seung-Yeol Oh & Dae-Seak Cha & Byoung-Sun Ko & Mina Kim, 2022. "Autonomous DC-Bus Voltage Regulation in DC Microgrid Using Distributed Energy Storage Systems," Energies, MDPI, vol. 15(13), pages 1-15, June.

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