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Independent Upper- and Lower-Arm Switching Scheme Based on Reference Current Polarity for Three-Level NPC Inverters

Author

Listed:
  • Kangsoon Ahn

    (Research and Development Center, Willings. Co., Ltd., Chobu-ro 54 beongil, Yongin-si 17037, Korea)

  • Yongseung Oh

    (Research and Development Center, Willings. Co., Ltd., Chobu-ro 54 beongil, Yongin-si 17037, Korea)

  • Wonseok Oh

    (Department of Electrical Engineering, Yuhan University, Gyeongin-ro 590, Bucheon 14780, Korea)

  • Kyumin Cho

    (Department of Information and Communication Engineering, Yuhan University, Gyeongin-ro 590, Bucheon 14780, Korea)

Abstract

This study presents a novel switching scheme for three-level neutral point clamped (NPC) inverters. The proposed switching method independently drives the upper- and lower-arm elements of the inverter based on the polarity information of the reference current. The proposed switching scheme does not require the inclusion of dead-time for each switching, except when the current polarity changes. Therefore, unlike the conventional inverter switching method, dead-time compensation is not needed, and the possibility of an arm-short accident is prevented. In this study, a switching procedure is detailed, and the operation mode analysis of the proposed switching scheme is presented. The effectiveness of the proposed switching method is verified experimentally by application to a grid-connected inverter that requires inverter current control.

Suggested Citation

  • Kangsoon Ahn & Yongseung Oh & Wonseok Oh & Kyumin Cho, 2021. "Independent Upper- and Lower-Arm Switching Scheme Based on Reference Current Polarity for Three-Level NPC Inverters," Energies, MDPI, vol. 14(17), pages 1-17, September.
    • Handle: RePEc:gam:jeners:v:14:y:2021:i:17:p:5535-:d:629230
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