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<p>This paper proposes a nine-level (9&#xa0;L) hybrid T-type nested neutral-point-clamped (HTNNPC) inverter composed of a four-level (4&#xa0;L) T-type nested NPC (TNNPC) converter cascaded with an H-bridge cell. Owing to this configuration, the proposed inverter significantly reduces the total component count, enhances DC-bus voltage utilization, and eliminates the need for DC-link capacitor voltage balancing control. For a 3-kV/1-MW system, the proposed 9&#xa0;L-HTNNPC inverter achieves main component cost reductions of 16.7%, 42.2%, and 43.4% compared with the 9&#xa0;L active NPC (ANPC), 9&#xa0;L stacked multicell (SMC), and 9&#xa0;L dual flying capacitor (DFC) inverters, respectively. However, due to the limited number of redundant switching states, voltage balancing for flying capacitors is challenging. To address this issue, a novel voltage balancing method based on offset-voltage injection combined with redundant switching-state selection under the level-shifted (LS) PWM scheme is developed. Under the LSPWM method and the capacitor voltage balancing control, the proposed inverter can achieve comparable performance in term of THD and power losses compare to other 9&#xa0;L inverters. The effectiveness of the proposed inverter topology is validated through experimental results obtained under both RL-load and induction motor drive conditions.</p>

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Nine-level hybrid T-type nested neutral-point-clamped inverter topology and flying capacitor voltage balancing control scheme

  • 期刊论文

  • 发表日期：

    2026年7月16日

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  • Ji-Hun Kim,
  • Dinh Du To,
  • Dong-Choon Lee

摘要

This paper proposes a nine-level (9 L) hybrid T-type nested neutral-point-clamped (HTNNPC) inverter composed of a four-level (4 L) T-type nested NPC (TNNPC) converter cascaded with an H-bridge cell. Owing to this configuration, the proposed inverter significantly reduces the total component count, enhances DC-bus voltage utilization, and eliminates the need for DC-link capacitor voltage balancing control. For a 3-kV/1-MW system, the proposed 9 L-HTNNPC inverter achieves main component cost reductions of 16.7%, 42.2%, and 43.4% compared with the 9 L active NPC (ANPC), 9 L stacked multicell (SMC), and 9 L dual flying capacitor (DFC) inverters, respectively. However, due to the limited number of redundant switching states, voltage balancing for flying capacitors is challenging. To address this issue, a novel voltage balancing method based on offset-voltage injection combined with redundant switching-state selection under the level-shifted (LS) PWM scheme is developed. Under the LSPWM method and the capacitor voltage balancing control, the proposed inverter can achieve comparable performance in term of THD and power losses compare to other 9 L inverters. The effectiveness of the proposed inverter topology is validated through experimental results obtained under both RL-load and induction motor drive conditions.