A Study on the Development of a 1 MW Grid-Connected Photovoltaic Inverter System

Ahn, Kang-Soon; Oh, Yeong Seok; Cho, Kyumin

doi:10.1109/rtucon48111.2019.8982367

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2021

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“…The authors state that this paper is based on a preliminary version [18] presented at the RTUCON conference in Riga, Latvia, in 2019.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

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

Ahn¹,

Oh²,

et al. 2021

Energies

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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.

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“…The authors state that this paper is based on a preliminary version [18] presented at the RTUCON conference in Riga, Latvia, in 2019.…”

Section: Introductionmentioning

confidence: 99%

“…Figure18. Experimental results in the case where the power factor is controlled at −0.9 (lead) using the proposed switching scheme: (a) waveforms of the output voltage and current; (b) waveforms of the gate signal.…”

mentioning

confidence: 99%