Single-Carrier Modulation for Neutral-Point-Clamped Inverters in Three-Phase Transformerless Photovoltaic Systems

Xiaoqiang Guo, Marcelo C. Cavalcanti, Alexandre M. Farias, Josep M. Guerrero

Research output: Contribution to journalLetterpeer-review

72 Citations (Scopus)
1505 Downloads (Pure)

Abstract

Modulation strategy is one of the most important issues for three-level neutral-point-clamped inverters in three-phase transformerless photovoltaic systems. A challenge for modulation is how to keep the common-mode voltages constant to reduce the leakage currents. A single-carrier modulation strategy is proposed. It has a very simple structure, and the common-mode voltages can be kept constant with no need of complex space-vector modulation or multicarrier pulsewidth modulation. Experimental results verify the theoretical analysis and the effectiveness of the presented method.
Original languageEnglish
JournalI E E E Transactions on Power Electronics
Volume28
Issue number6
Pages (from-to)2635-2637
Number of pages8
ISSN0885-8993
DOIs
Publication statusPublished - Oct 2013

Keywords

  • Common-mode voltage , modulation , neutral-point-clamped inverter , transformerless photovoltaic (PV) system

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