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The configuration of grid-forming converters can improve the stability of the hybrid system in the sub-synchronous frequency band under the weak grid, and the ratio of grid-forming (GFM)/grid-following (GFL) converters is a key factor affecting the stability of the system. In order to study the influence of the converter control system characteristics on the boundary conditions of GFM converter’s ratio, this paper establishes a state-space model of GFM/GFL hybridization, analyzes the influence of the parameter in each control loop of the GFM/GFL converter and the voltage loop structure of the GFM converter on the stability of the system. For ensuring the stability in the sub-synchronous frequency band of the system, stabilizing bounds for the capacity ratios under the constraints of each influencing factor are obtained. Finally, the theoretical analysis is verified based on the RT-LAB semi-physical platform.

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Analysis of the Factors Affecting Ratio Optimization of Grid-Forming/Grid-Following Converters in Hybrid Grid Connected Systems

  • 会议论文

  • 发表日期：

    2025年

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  • Bin Zhang,
  • Xueguang Zhang,
  • Dianguo Xu

摘要

The configuration of grid-forming converters can improve the stability of the hybrid system in the sub-synchronous frequency band under the weak grid, and the ratio of grid-forming (GFM)/grid-following (GFL) converters is a key factor affecting the stability of the system. In order to study the influence of the converter control system characteristics on the boundary conditions of GFM converter’s ratio, this paper establishes a state-space model of GFM/GFL hybridization, analyzes the influence of the parameter in each control loop of the GFM/GFL converter and the voltage loop structure of the GFM converter on the stability of the system. For ensuring the stability in the sub-synchronous frequency band of the system, stabilizing bounds for the capacity ratios under the constraints of each influencing factor are obtained. Finally, the theoretical analysis is verified based on the RT-LAB semi-physical platform.