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<p>Fault-tolerant control (FTC) is crucial for improving the reliability of three-level T-type neutral-point-clamped (TNPC) inverters. However, conventional FTC methods inevitably restrict the available output voltage range during half-bridge switch faults, which results in a significant reduction in the linear modulation region. This limitation prevents the motor from reaching its rated speed and compromises stability in high-speed regions due to the lack of a voltage margin. To overcome this, this paper proposes an enhanced FTC strategy incorporating flux-weakening control. By optimizing the <i>d</i>-axis and <i>q</i>-axis current trajectories within the constrained voltage and current envelopes, the proposed method ensures stable high-speed operation under faulty conditions. The proposed method is implemented on a relay-based fault-tolerant topology, which is strategically utilized to eliminate neutral-point voltage unbalance and provide an increased voltage range compared to existing conventional methods. The effectiveness of the proposed strategy is verified through comprehensive simulations and experimental results.</p>

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Relay-based fault-tolerant flux-weakening control of three-level T-type NPC inverter-fed induction motor drives

  • 期刊论文

  • 发表日期：

    2026年4月20日

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  • Hyeongjun Park,
  • Daewon Baek,
  • Hyunsoo Jeon,
  • Youngjong Ko

摘要

Fault-tolerant control (FTC) is crucial for improving the reliability of three-level T-type neutral-point-clamped (TNPC) inverters. However, conventional FTC methods inevitably restrict the available output voltage range during half-bridge switch faults, which results in a significant reduction in the linear modulation region. This limitation prevents the motor from reaching its rated speed and compromises stability in high-speed regions due to the lack of a voltage margin. To overcome this, this paper proposes an enhanced FTC strategy incorporating flux-weakening control. By optimizing the d-axis and q-axis current trajectories within the constrained voltage and current envelopes, the proposed method ensures stable high-speed operation under faulty conditions. The proposed method is implemented on a relay-based fault-tolerant topology, which is strategically utilized to eliminate neutral-point voltage unbalance and provide an increased voltage range compared to existing conventional methods. The effectiveness of the proposed strategy is verified through comprehensive simulations and experimental results.