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The grid converter usually needs to take current limiting measures to suppress overcurrent, which will make the power system become a switching system, and the switching mechanism of the switching system is not clear. In this paper, for dual-machine systems considering current limiting, the switching boundary of two converters in constant voltage control mode and current limiting control mode is deduced by circuit principle, and the switching mechanism of the system is defined. It is found that when the current saturation algorithm is used to limit the current, the setting of the saturation current angle will affect the switching boundary and the stable equilibrium point of two converters in the current limiting mode. Finally, by configuring the saturation current angle and changing the stable equilibrium point position of the converter in current limiting mode, the converter is not locked in current limiting mode, and the theory is verified by simulation.

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Switching Mechanism and Stability Analysis of Dual PSL System Considering Current Limiting

  • 会议论文

  • 发表日期：

    2025年

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  • Zengze Tu,
  • Jingrui Liu,
  • Zhenxing Shao,
  • Jiapeng Li,
  • Yonghui Liu,
  • Yujun Li

摘要

The grid converter usually needs to take current limiting measures to suppress overcurrent, which will make the power system become a switching system, and the switching mechanism of the switching system is not clear. In this paper, for dual-machine systems considering current limiting, the switching boundary of two converters in constant voltage control mode and current limiting control mode is deduced by circuit principle, and the switching mechanism of the system is defined. It is found that when the current saturation algorithm is used to limit the current, the setting of the saturation current angle will affect the switching boundary and the stable equilibrium point of two converters in the current limiting mode. Finally, by configuring the saturation current angle and changing the stable equilibrium point position of the converter in current limiting mode, the converter is not locked in current limiting mode, and the theory is verified by simulation.