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<p>A dynamic control strategy based on redundant state switching is proposed to address the floating capacitor voltage imbalance problem in an active neutral-point-clamped five-level inverter. By analyzing the relationship between the charging and discharging mechanisms of the floating capacitor and the output current direction, an efficient control method is designed that does not require real-time determination of current direction or capacitor voltage status. This strategy balances the charging and discharging durations of the floating capacitor by periodically alternating the selection of redundant switching states, effectively suppressing the continuous accumulation of voltage deviations. Simulation results demonstrate that the proposed method rapidly converges to the target voltage during dynamic regulation, significantly optimizes the output waveform quality, and achieves a total harmonic distortion (THD) of the output current as low as 0.82%. Experiments further validate the strategy’s effectiveness: The floating capacitor voltage achieves balance within 0.1&#xa0;s, and the steady-state fluctuation range is controlled within 1&#xa0;V, proving the superiority of the control strategy in terms of dynamic response and steady-state performance.</p>

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Dynamic balancing control strategy for floating capacitor voltage in ANPC-5L inverters based on redundant state switching

  • 期刊论文

  • 发表日期：

    2026年3月21日

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  • Kun Xia,
  • Ke Yang,
  • Daming Huang,
  • Jingxia Wang,
  • Po Xu

摘要

A dynamic control strategy based on redundant state switching is proposed to address the floating capacitor voltage imbalance problem in an active neutral-point-clamped five-level inverter. By analyzing the relationship between the charging and discharging mechanisms of the floating capacitor and the output current direction, an efficient control method is designed that does not require real-time determination of current direction or capacitor voltage status. This strategy balances the charging and discharging durations of the floating capacitor by periodically alternating the selection of redundant switching states, effectively suppressing the continuous accumulation of voltage deviations. Simulation results demonstrate that the proposed method rapidly converges to the target voltage during dynamic regulation, significantly optimizes the output waveform quality, and achieves a total harmonic distortion (THD) of the output current as low as 0.82%. Experiments further validate the strategy’s effectiveness: The floating capacitor voltage achieves balance within 0.1 s, and the steady-state fluctuation range is controlled within 1 V, proving the superiority of the control strategy in terms of dynamic response and steady-state performance.