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http://dx.doi.org/10.6113/TKPE.2014.19.5.407

A Small Signal Modeling of Three-level Neutral-Point-Clamped Inverter and Neutral-Point Voltage Oscillation Reduction  

Cho, Ja-Hwi (Dept. of Adavnced Power Conversion System Eng., Hanyang University)
Ku, Nam-Joon (Dept. of Electrical Eng., Hanyang University)
Joung, Seok-Eon (Dept. of Electrical Eng., Hanyang University)
Hyun, Dong-Seok (Dept. of Electrical Eng., Hanyang University)
Publication Information
The Transactions of the Korean Institute of Power Electronics / v.19, no.5, 2014 , pp. 407-414 More about this Journal
Abstract
This study proposes a control design for the grid output current and for reducing the neutral-point voltage oscillation through the small-signal modeling of the three-phase grid connected with a three-level neutral-point-clamped (NPC) inverter with LCL filter. The three-level NPC inverter presents an inherent problem: the neutral-point voltage fluctuation caused by the neutral-point current flowing in or out from the neutral point. The small signal modeling consists of averaging, dq0 transformation, perturbing, and linearizing steps performed on a three-phase grid connected to a three-level NPC inverter with LCL filter. The proposed method controls both the grid output and neutral-point currents at every switching period and reduces the neutral-point voltage oscillation. The validity of the proposed method is verified through simulation and experiment.
Keywords
Grid connected inverter system; Small signal modeling; Neutral point current; Neutral point voltage;
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