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Energies 2015, 8(3), 2032-2047; doi:10.3390/en8032032

A Varied VSVM Strategy for Balancing the Neutral-Point Voltage of DC-Link Capacitors in Three-Level NPC Converters

State Key Laboratory of Advanced Electromagnetic Engineering and Technology, Huazhong University of Science and Technology, Wuhan 430074, China
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Academic Editor: Frede Blaabjerg
Received: 6 January 2015 / Revised: 18 February 2015 / Accepted: 28 February 2015 / Published: 13 March 2015
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Abstract

In the research field of multilevel converters, three-level NPC (neutral-point-clamped) converters, which unfortunately may cause the deviation of the neutral-point voltage of DC-link capacitors, are widely discussed. Theoretically, virtual space vector modulation (VSVM) could guarantee the balance control of the neutral-point voltage. However, there still exist some uncontrollable space vector regions. Based on VSVM, this paper proposes a varied virtual space vector modulation (VVSVM) method for three-level NPC converters. Under complete modulation conditions, this method can control the balance of the neutral-point voltage of DC-link capacitors by adjusting the duty cycle of small vectors and regulating the current generated by virtual medium vectors. Compared with commonly used VSVM methods and mixed modulation strategies, this method is simpler and more practical. The effectiveness and validity of this method are verified by simulations and experiments. View Full-Text
Keywords: three level; neutral-point-clamped (NPC) converter; space vector modulation (SVM); virtual space vector modulation (VSVM); varied virtual space vector modulation (VVSVM) three level; neutral-point-clamped (NPC) converter; space vector modulation (SVM); virtual space vector modulation (VSVM); varied virtual space vector modulation (VVSVM)
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Gui, S.W.; Lin, Z.J.; Huang, S.H. A Varied VSVM Strategy for Balancing the Neutral-Point Voltage of DC-Link Capacitors in Three-Level NPC Converters. Energies 2015, 8, 2032-2047.

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