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The Active NPC Converter and Its Loss-Balancing Control

2005; Institute of Electrical and Electronics Engineers; Volume: 52; Issue: 3 Linguagem: Inglês

10.1109/tie.2005.847586

1557-9948

Thomas Brückner, Steffen Bernet, H. Güldner,

Silicon Carbide Semiconductor Technologies

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.