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International Journal of Photoenergy
Volume 2017, Article ID 2383872, 8 pages
Research Article

Modeling and Modulation of NNPC Four-Level Inverter for Solar Photovoltaic Power Plant

1Department of Electrical Engineering, Yanshan University, Qinhuangdao, China
2Department of Electrical and Computer Engineering, McMaster University, Hamilton, ON, Canada

Correspondence should be addressed to Xiaoqiang Guo; moc.361@gnimudey

Received 17 January 2017; Accepted 8 May 2017; Published 30 July 2017

Academic Editor: Matthias Auf der Maur

Copyright © 2017 Xiaoqiang Guo et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


Photovoltaic (PV) power plant is an attractive way of utilizing the solar energy. For high-power PV power plant, the multilevel inverter is of potential interest. In contrast to the neutral-point clamped (NPC) or flying capacitor (FC) multilevel inverter, the nested neutral point clamped (NNPC) four-level inverter has better features for solar photovoltaic power plant. In practical applications, the common mode voltage reduction of the NNPC four-level is one of the important issues. In order to solve the problem, a new modulation strategy is proposed to minimize the common mode voltage. Compared with the conventional solution, our proposal can reduce the common mode voltage to 1/18 of the DC bus voltage. Moreover, it has the capability to balance the capacitor voltages. Finally, we carried out time-domain simulations to test the performance of the NNPC four-level inverter.