1 Power Electronic Systems, The Faculty of Engineering and Science, Aalborg University, VBN2 Department of Energy Technology, The Faculty of Engineering and Science, Aalborg University, VBN3 The Faculty of Engineering and Science (ENG), Aalborg University, VBN4 Yanshan University5 Federal University of Pernanbuco6 Federal University of Pernanbuco7 Yanshan University
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.
I E E E Transactions on Power Electronics, 2013, Vol 28, Issue 6, p. 2635-2637
Common-mode voltage , modulation , neutral-point-clamped inverter , transformerless photovoltaic (PV) system