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<p>During the stable operation of grid-connected inverters, the occurrence of faults such as grid voltage sensor disconnection can substantially disrupt system stability. To address this, a novel frequency-domain predictive control method is proposed. This method aims to achieve control independent of grid voltage information while reducing harmonic content in grid-connected currents, accelerating computation speed, and bolstering system robustness. The approach employs a sliding mode observer to ensure real-time tracking of grid voltage; thus, it facilitates precise observation of the target grid voltage. Within the 60° coordinate system (gh coordinate system), the voltage vector plane is segmented into N equal sections, which effectively increases the count of virtual vectors. Leveraging observed grid voltage values to predict the reference voltage vector, in conjunction with using the reference voltage vector for the selection of virtual vectors, enhances precision and efficiency in selecting virtual vectors. To refine the accuracy and efficiency of virtual vector selection further, a geometric-based approach is proposed. This methodology not only boosts controller execution efficiency but also enables grid voltage sensorless control. Simulations and experiments confirm the effectiveness and validity of the proposed method.</p>

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Grid voltage sensorless fixed-frequency model predictive control for grid-connected inverters

  • 期刊论文

  • 发表日期：

    2025年2月24日

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  • Jiang Liu,
  • Jixiang Wang,
  • Zhonghang Sun,
  • Zicheng Li

摘要

During the stable operation of grid-connected inverters, the occurrence of faults such as grid voltage sensor disconnection can substantially disrupt system stability. To address this, a novel frequency-domain predictive control method is proposed. This method aims to achieve control independent of grid voltage information while reducing harmonic content in grid-connected currents, accelerating computation speed, and bolstering system robustness. The approach employs a sliding mode observer to ensure real-time tracking of grid voltage; thus, it facilitates precise observation of the target grid voltage. Within the 60° coordinate system (gh coordinate system), the voltage vector plane is segmented into N equal sections, which effectively increases the count of virtual vectors. Leveraging observed grid voltage values to predict the reference voltage vector, in conjunction with using the reference voltage vector for the selection of virtual vectors, enhances precision and efficiency in selecting virtual vectors. To refine the accuracy and efficiency of virtual vector selection further, a geometric-based approach is proposed. This methodology not only boosts controller execution efficiency but also enables grid voltage sensorless control. Simulations and experiments confirm the effectiveness and validity of the proposed method.