Common-Mode Voltage Elimination for Medium-Voltage Three-Level NPC Inverters Based on an Auxiliary Circuit

Quoc Anh Le; Quoc Anh Le; Sangmin Lee; Dong-Choon Lee

Common-Mode Voltage Elimination for Medium-Voltage Three-Level NPC Inverters Based on an Auxiliary Circuit

Quoc Anh Le

Sangmin Lee

Dong-Choon Lee

Vol. 16, No. 6, pp. 2076-2084, Nov. 2016

10.6113/JPE.2016.16.6.2076

Active circuit

Common-mode voltage

High-power medium-voltage drives

Neutral-point clamped inverter

Space vector modulation

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Abstract

In this paper, a novel scheme to eliminate common-mode voltage (CMV) is proposed for three-level neutral-point clamped (NPC) inverters. In the proposed scheme, a low-power full-bridge converter is utilized to produce compensatory voltage for CMV, which is injected into an NPC inverter through a single-phase four-winding transformer. With the proposed circuit, the power range for applications is not limited, and the maximum modulation index of the inverter is not reduced. These features are suitable for high-power medium-voltage machine drives. The effectiveness of the proposed method is verified by simulation and experimental results.

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Cite this article

[IEEE Style]

Q. A. Le, Q. A. Le, S. Lee, D. Lee, "Common-Mode Voltage Elimination for Medium-Voltage Three-Level NPC Inverters Based on an Auxiliary Circuit," Journal of Power Electronics, vol. 16, no. 6, pp. 2076-2084, 2016. DOI: 10.6113/JPE.2016.16.6.2076.

[ACM Style]

Quoc Anh Le, Quoc Anh Le, Sangmin Lee, and Dong-Choon Lee. 2016. Common-Mode Voltage Elimination for Medium-Voltage Three-Level NPC Inverters Based on an Auxiliary Circuit. Journal of Power Electronics, 16, 6, (2016), 2076-2084. DOI: 10.6113/JPE.2016.16.6.2076.