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When a fault occurs in the renewable energy station system with distributed synchronous condenser(SC), the control and protection strategies such as high and low voltage ride through, power recovery and emergency off-grid of wind power and photovoltaic power electronic equipment will have a serious impact on the transient stability of the SC. The excitation system of the SC is mostly controlled by the terminal voltage. The high-gain closed-loop regulation makes the terminal voltage reach the rated level at the beginning of the big disturbance, it plays a very limited role in maintaining the power angle stability of the electromechanical time scale, which is not conducive to the safe and stable operation of the SC and the renewable energy station. For this reason, the mechanism of power angle stabilization in the process of fault disturbance of excitation control system of SC is explained. Secondly, the influence of renewable power supply high and low voltage ride through strategy on the transient stability of SC is analyzed, and on this basis, the excitation control strategy to improve the transient stability of SC is proposed. Finally, the effectiveness of the proposed strategy is verified through simulation.

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Research on Excitation Control of Distributed Synchronous Condensers in Renewable Energy Station for Improving Transient Stability

  • 会议论文

  • 发表日期：

    2025年

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  • Chuan Qin,
  • Hao Liang,
  • Hongfei Zhao,
  • Xuanyuan Wang,
  • Haitao Liu,
  • Huan Xie,
  • Wei Kang,
  • Tianqi Zhao

摘要

When a fault occurs in the renewable energy station system with distributed synchronous condenser(SC), the control and protection strategies such as high and low voltage ride through, power recovery and emergency off-grid of wind power and photovoltaic power electronic equipment will have a serious impact on the transient stability of the SC. The excitation system of the SC is mostly controlled by the terminal voltage. The high-gain closed-loop regulation makes the terminal voltage reach the rated level at the beginning of the big disturbance, it plays a very limited role in maintaining the power angle stability of the electromechanical time scale, which is not conducive to the safe and stable operation of the SC and the renewable energy station. For this reason, the mechanism of power angle stabilization in the process of fault disturbance of excitation control system of SC is explained. Secondly, the influence of renewable power supply high and low voltage ride through strategy on the transient stability of SC is analyzed, and on this basis, the excitation control strategy to improve the transient stability of SC is proposed. Finally, the effectiveness of the proposed strategy is verified through simulation.