A Modulation Technique for Neutral Point Voltage Control of the Three-Level Neutral-Point-Clamped Converter

作者：Chen Hsin Chih^*; Tsai Meng Jiang; Wang Yao Bang; Cheng Po Tai

来源：IEEE Transactions on Industry Applications, 2018, 54(3): 2517-2524.

DOI：10.1109/TIA.2018.2799906

• Dipolar switching
• neutral-point-clamped (NPC) converter
• neutral-point voltage-balancing (NPVB) control
• three-phase four-wire (3P4W)

The neutral-point voltage-balancing control is a critical issue of a neutral-point-clamped converter. The conventional control strategy is to inject the specific zero-sequence voltage to regulate the redundant vector, but it is unacceptable to the three-phase four-wire system. This paper provides a neutral-point voltage-balancing control by the dipolar modulation, and the control freedom of the zero-sequence voltage is flexible. Therefore, the proposed method is suitable for both three-phase three-wire and three-phase four-wire systems. Besides, the proposed method improves the control dynamic in a reactive power system. The proposed neutral-point voltage-balancing control is verified by the mathematical analysis and experimental results. The control dynamic, power loss estimation, and the output current performance are analyzed in this paper.

• 出版日期2018-6
• 单位清华大学