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Grid Forming Cascaded H-Bridge Static Var Generator (GFM CHB-SVG) has received extensive attention in recent years due to the capability of positive inertia supporting and voltage supporting. In the event of asymmetric low-voltage faults, the GFM CHB-SVG must possess inherent reactive power output capabilities, achieve overcurrent suppression, and maintain DC side capacitor voltage balance. However, little research has conducted on Low Voltage Ride Through (LVRT) under asymmetric grid voltage drop for GFM CHB-SVG. Therefore, this paper proposed an asymmetric LVRT control strategy for GFM CHB-SVG. Firstly, the basic control strategy for GFM CHB-SVG is introduced by describing the overall control scheme. Secondly, the control strategy in asymmetric LVRT mode is introduced in three aspects, including reactive power loop adjusting, current reference limiting and DC voltage balancing based on Negative Current Feed Forward Control. Finally, based on MATLAB/Simulink simulation, the effectiveness of the proposed asymmetric LVRT control strategy for GFM CHB-SVG is verified.

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Asymmetric LVRT Control Strategy for Star-Connected Grid Forming CHB-SVG Based on Negative Current Feed Forward Control

  • 会议论文

  • 发表日期：

    2025年

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  • Xiangyi Liu,
  • Jun Zhang,
  • Tingrui Fang,
  • Yu Zhang,
  • Zhengbo Guo,
  • Yi Liu,
  • Runtian Li,
  • Yonghui Liu

摘要

Grid Forming Cascaded H-Bridge Static Var Generator (GFM CHB-SVG) has received extensive attention in recent years due to the capability of positive inertia supporting and voltage supporting. In the event of asymmetric low-voltage faults, the GFM CHB-SVG must possess inherent reactive power output capabilities, achieve overcurrent suppression, and maintain DC side capacitor voltage balance. However, little research has conducted on Low Voltage Ride Through (LVRT) under asymmetric grid voltage drop for GFM CHB-SVG. Therefore, this paper proposed an asymmetric LVRT control strategy for GFM CHB-SVG. Firstly, the basic control strategy for GFM CHB-SVG is introduced by describing the overall control scheme. Secondly, the control strategy in asymmetric LVRT mode is introduced in three aspects, including reactive power loop adjusting, current reference limiting and DC voltage balancing based on Negative Current Feed Forward Control. Finally, based on MATLAB/Simulink simulation, the effectiveness of the proposed asymmetric LVRT control strategy for GFM CHB-SVG is verified.