The active NPC converter and its loss-balancing control
Bruckner, T.
Bernet, S.
Guldner, H.
Inst. of Energy & Autom., Tech. Univ. of Berlin, Germany;
This paper appears in: Industrial Electronics, IEEE Transactions on
Publication Date: June 2005
Volume: 52,
Issue: 3
On page(s): 855- 868
ISSN: 0278-0046
INSPEC Accession Number: 8464613
Digital Object Identifier: 10.1109/TIE.2005.847586
Current Version Published: 2005-05-31
Abstract
The three-level neutral-point-clamped voltage-source converter (NPC VSC) is widely used in high-power medium-voltage applications. The unequal loss distribution among the semiconductors is one major disadvantage of this popular topology. This paper studies the loss distribution problem of the NPC VSC and proposes the active NPC VSC to overcome this drawback. The switch states and commutations of the converter are analyzed. A loss-balancing scheme is introduced, enabling a substantially increased output power and an improved performance at zero speed, compared to the conventional NPC VSC.
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