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 language | English |
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Journal | I E E E Transactions on Power Electronics |
Volume | 28 |
Issue number | 6 |
Pages (from-to) | 2635-2637 |
Number of pages | 8 |
ISSN | 0885-8993 |
DOIs | |
Publication status | Published - Oct 2013 |
Keywords
- Common-mode voltage , modulation , neutral-point-clamped inverter , transformerless photovoltaic (PV) system