NDLI: Neutral-point current modeling and control for Neutral-Point Clamped three-level converter drive with small DC-link capacitors

Content Provider	IEEE Xplore Digital Library
Author	Maheshwari, R. Munk-Nielsen, S. Busquets-Monge, S.
Copyright Year	2011
Description	Author affiliation: Department of Electronic Engineering, Technical University of Catalonia, Barcelona, Spain (Busquets-Monge, S.) \|\| Department of Energy Technology, Aalborg University, Denmark (Maheshwari, R.; Munk-Nielsen, S.)
Abstract	A Neutral-Point-Clamped (NPC) three-level inverter with small DC-link capacitors is presented in this paper. This inverter requires zero average neutral-point current for stable neutral-point potential. A simple carrier based modulation strategy is proposed for achieving zero average neutral-point current. A new simplified model of the neutral-point voltage dynamics is derived for the proposed modulation strategy. This model shows that the neutral-point current is proportional to the power drawn from the converter and it enables the use of well established classical control theory for neutral-point voltage controller design. A PI controller is used for neutral-point voltage balance. The implementation of the proposed modulation strategy and controller is simple. It does not require any information about the output phase currents. The controller is implemented in a 7.5 kW induction machine based drive with only 14 µF DC-link capacitors. A fast and stable performance of the neutral-point voltage controller is achieved and verified by experiments.
Starting Page	2087
Ending Page	2094
File Size	556519
Page Count	8
File Format	PDF
ISBN	9781457705427
e-ISBN	9781457705410
DOI	10.1109/ECCE.2011.6064044
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2011-09-17
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Capacitors Switches Pulse width modulation Voltage control Power generation
Content Type	Text
Resource Type	Article

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