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<p>The penetration rate of renewable energy in power systems is soaring, making grid-forming converters increasingly important for grid integration. Nevertheless, under large-scale disturbances like grid faults, these converters often face severe overcurrent issues due to their limited current carrying capacity, rendering current-limiting control essential. Traditional fixed virtual impedance-based current-limiting strategies have a fundamental flaw. They cannot effectively balance equipment overload capacity and the urgent need for transient voltage support during critical moments. To address this, this paper proposes a novel inverse-time limit gradient current-limiting control scheme for grid-forming converters, based on an in-depth overload capacity characterization model. Simulation and experimental results verify its effectiveness and practicality, offering a reliable solution for grid-forming converters to handle large-scale disturbances and enhance power system stability.</p>

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Fault-ride-through scheme for grid-forming converters based on overload capacity characterization model

  • 期刊论文

  • 发表日期：

    2025年8月27日

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  • Guanjun Li,
  • Haoyuan Li,
  • Saijin Huang,
  • Xiangyu Wang,
  • Qiang Li

摘要

The penetration rate of renewable energy in power systems is soaring, making grid-forming converters increasingly important for grid integration. Nevertheless, under large-scale disturbances like grid faults, these converters often face severe overcurrent issues due to their limited current carrying capacity, rendering current-limiting control essential. Traditional fixed virtual impedance-based current-limiting strategies have a fundamental flaw. They cannot effectively balance equipment overload capacity and the urgent need for transient voltage support during critical moments. To address this, this paper proposes a novel inverse-time limit gradient current-limiting control scheme for grid-forming converters, based on an in-depth overload capacity characterization model. Simulation and experimental results verify its effectiveness and practicality, offering a reliable solution for grid-forming converters to handle large-scale disturbances and enhance power system stability.