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

Kangsoon Ahn, Yongseung Oh, Wonseok Oh and Kyumin Cho
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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

Energies, 2021, vol. 14, issue 17, 1-17

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.

Keywords: current control; inverters; pulse width modulation; photovoltaic system (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: 2021
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