NDLI: A neutral point balancing controller for three-level inverter with full power-factor range and low distortion

Content Provider	IEEE Xplore Digital Library
Author	Jie Shen Schroder, S. Duro, B. Roesner, R.
Copyright Year	2011
Description	Author affiliation: Controls & Power Electronics CoE, GE Energy, Freisinger Landstraße 50, Garching b. München, Germany (Duro, B.; Roesner, R.) \|\| High Power Electronics Lab, GE Global Research, Freisinger Landstraße 50, Garching b. München, Germany (Jie Shen; Schroder, S.)
Abstract	This paper proposes a dynamic neutral-point (NP) potential balancing algorithm for Neutral-Point-Clamped three-level inverters. It is known that the original NP current without NP control cannot contribute to the dc balancing because it is dc-free and dominated by the $3^{rd}$ harmonic. In our proposal, this online pre-calculated original NP current pattern is modified by different gains dynamically according to the sign, if a dc balancing current is desired. This modified pattern is sent as an instantaneous reference NP current to output the command common mode (CM) voltage using a lookup table. If a strong dc balancing current is desired, the CM voltage is so effectively injected that the maximum NP current equal to the physical limit is obtained at any instant. At low unbalance conditions, the original NP current pattern is only slightly modified so that the amplitude of the resultant CM voltage is quite low, i.e. our NP controller has low impact on the original design (i.e. without NP control). With the help of the proposed novel control loop, the CM voltage is intrinsically changing from quasi-DC injection at high power factors (PF) to a $6^{th}$ harmonic dominated injection at low PFs automatically and smoothly. This algorithm has superior THD performance and the maximum balancing ability at any power factors, which is proven via a comparison between different NP control algorithms in this paper.
Starting Page	3419
Ending Page	3426
File Size	3174028
Page Count	8
File Format	PDF
ISBN	9781457705427
e-ISBN	9781457705410
DOI	10.1109/ECCE.2011.6064231
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	Voltage measurement Neutral point control Heuristic algorithms Self-balancing Transfer functions Harmonic analysis Inverters NPC inverter Voltage control Power harmonic filters Dynamic common mode injection
Content Type	Text
Resource Type	Article

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