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

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4 Author(s)
Xiaoqiang Guo ; Dept. of Electr. Eng., Yanshan Univ., Qinhuangdao, China ; Cavalcanti, M.C. ; Farias, A.M. ; Guerrero, J.M.

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.

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Power Electronics, IEEE Transactions on  (Volume:28 ,  Issue: 6 )