A Novel Discontinuous Modulation Strategy With Reduced Common-Mode Voltage and Removed DC Offset on Neutral-Point Voltage for Neutral-Point-Clamped Three-Level Converter

作者：Wang, Jinping; Zhai, Fei; Wang, Jianing; Jiang, Weidong^*; Li, Jinsong; Li, Laibao; Huang, Xinmei

来源：IEEE Transactions on Power Electronics, 2019, 34(8): 7637-7649.

DOI：10.1109/TPEL.2018.2879351

• Modulation strategy
• neutral-point voltage balance
• switching loss
• three-level converter

In this paper, a novel discontinuous pulsewidth modulation (DPWM) modulation strategy for a neutral-point-clamped (NPC) three-level converter (TLC) is proposed to reduce the switching loss, reduce common-mode voltage (CMV), and remove dc offset from the neutral-point (NP) voltage simultaneously, which is named as RCMV_DPWM. Based on the space vector diagram with reduced CMV, all clamping modes under RCMV_DPWM are revealed. Then, the NP voltage is controlled by selecting proper clamping mode. The realization of RCMV_DPWM is also discussed. Moreover, the performances of RCMV_DPWM are analyzed and compared with other PWM strategies in term of the NP voltage ripple, switching loss, and waveform quality. Finally, the feasibility and superiority of RCMV_DPWM are verified by experiments.

• 出版日期2019-8
• 单位合肥工业大学