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With the rapid development of new energy power generation, the problems of insufficient inertia and voltage support in the new electricity system become significant. The configuration of static var generator (SVG) in new energy station can quickly carry out reactive power compensation and improve the stability of the system. However, the traditional grid-following (GFL) SVG is difficult to meet the inertia and voltage support requirements of high-permeability new energy power systems. This paper firstly proposes a new grid-forming (GFM) SVG control to effectively compensate the reactive power of the power grid, which utilizes the DC capacitor to provide inertia support. Secondly, aiming at the over-current problem of GFM-SVG, a low voltage ride through (LVRT) strategy is proposed by analyzing the over-current mechanism, which ensures the stable operation of the system when the grid voltage drops. Finally, the correctness of the proposed new GFM-SVG control strategy and the effectiveness of the LVRT strategy when the three-phase voltage symmetrical drop fault occurs in the power grid are verified through simulation results.

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New Grid-Forming SVG Control and LVRT Strategy Based on Improved VSG Control

  • 会议论文

  • 发表日期：

    2025年

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  • Tingrui Fang,
  • Xiangyi Liu,
  • Yi Liu,
  • Xiaoyu Zhang,
  • Mingxuan Li,
  • Yonghui Liu

摘要

With the rapid development of new energy power generation, the problems of insufficient inertia and voltage support in the new electricity system become significant. The configuration of static var generator (SVG) in new energy station can quickly carry out reactive power compensation and improve the stability of the system. However, the traditional grid-following (GFL) SVG is difficult to meet the inertia and voltage support requirements of high-permeability new energy power systems. This paper firstly proposes a new grid-forming (GFM) SVG control to effectively compensate the reactive power of the power grid, which utilizes the DC capacitor to provide inertia support. Secondly, aiming at the over-current problem of GFM-SVG, a low voltage ride through (LVRT) strategy is proposed by analyzing the over-current mechanism, which ensures the stable operation of the system when the grid voltage drops. Finally, the correctness of the proposed new GFM-SVG control strategy and the effectiveness of the LVRT strategy when the three-phase voltage symmetrical drop fault occurs in the power grid are verified through simulation results.