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<p>Aiming at addressing overcurrent issues under unbalanced grid voltage drops and load variations, improved modulated model predictive control strategy is proposed for three-level T-type grid-connected inverter in this paper, in which combines constant power control and current-limiting strategies to generate current references, that allowed maximum output current to ensure a sinusoidal output current with limited amplitude. The control strategy employs space vector pulse width modulation (SVPWM) to generate a seven-step pulse sequence using four voltage vectors in the voltage vector sector. Thus, it synthesizes the voltage reference while maintaining a fixed switching frequency. Moreover, to minimize potential imbalances in the inverter, double-objective cost function was utilized to effectively control the neutral-point potential, limiting its absolute value to less than 1&#xa0;V. The simulations and hardware-in-the-loop (HIL) experiments were established and verified the proposed strategy. The results demonstrate that the proposed strategy not only provides good transient response under unbalanced grid conditions and load variations but also achieves excellent steady-state performance. The total harmonic distortion (THD) could be as low as 1.55%, which is a significant improvement compared to previously reported alternatives.</p>

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A fast current-limiting strategy for three-level T-type grid-connected inverter under unbalanced grid voltage

  • 期刊论文

  • 发表日期：

    2026年7月27日

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  • Daoming Luo,
  • Zhangyong Chen,
  • Yong Chen,
  • Yiding Sun

摘要

Aiming at addressing overcurrent issues under unbalanced grid voltage drops and load variations, improved modulated model predictive control strategy is proposed for three-level T-type grid-connected inverter in this paper, in which combines constant power control and current-limiting strategies to generate current references, that allowed maximum output current to ensure a sinusoidal output current with limited amplitude. The control strategy employs space vector pulse width modulation (SVPWM) to generate a seven-step pulse sequence using four voltage vectors in the voltage vector sector. Thus, it synthesizes the voltage reference while maintaining a fixed switching frequency. Moreover, to minimize potential imbalances in the inverter, double-objective cost function was utilized to effectively control the neutral-point potential, limiting its absolute value to less than 1 V. The simulations and hardware-in-the-loop (HIL) experiments were established and verified the proposed strategy. The results demonstrate that the proposed strategy not only provides good transient response under unbalanced grid conditions and load variations but also achieves excellent steady-state performance. The total harmonic distortion (THD) could be as low as 1.55%, which is a significant improvement compared to previously reported alternatives.