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<p>During the pre-synchronization grid connection process of islanded microgrids, frequency deviation phenomena occur. Excessive frequency deviation may lead to abnormal equipment operation and compromise system stability. To address this issue, the following approaches are proposed: First, methods such as phase shifting, introduction of compensation terms, and sign inversion are employed to eliminate zero point in the voltage dq-decoupling-based pre-synchronization method and shorten the pre-synchronization path. Second, a small-signal frequency difference model incorporating angular frequency compensation is established to analyze parameter impacts on frequency deviation, thereby simplifying parameter design. Finally, the influence of controller parameters on pre-synchronization speed and frequency deviation is investigated, leading to an adaptive pre-synchronization control strategy that balances synchronization speed and frequency deviation. Simulation results demonstrate that this method significantly enhances pre-synchronization speed while ensuring frequency limits are not exceeded.</p>

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Pre-synchronization control strategy for grid-forming converters considering frequency deviation and synchronization speed

  • 期刊论文

  • 发表日期：

    2026年1月20日

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  • Ling Yang,
  • Xinlong Deng,
  • Ning He,
  • Yon Dai,
  • Xu Du,
  • Jian Wang

摘要

During the pre-synchronization grid connection process of islanded microgrids, frequency deviation phenomena occur. Excessive frequency deviation may lead to abnormal equipment operation and compromise system stability. To address this issue, the following approaches are proposed: First, methods such as phase shifting, introduction of compensation terms, and sign inversion are employed to eliminate zero point in the voltage dq-decoupling-based pre-synchronization method and shorten the pre-synchronization path. Second, a small-signal frequency difference model incorporating angular frequency compensation is established to analyze parameter impacts on frequency deviation, thereby simplifying parameter design. Finally, the influence of controller parameters on pre-synchronization speed and frequency deviation is investigated, leading to an adaptive pre-synchronization control strategy that balances synchronization speed and frequency deviation. Simulation results demonstrate that this method significantly enhances pre-synchronization speed while ensuring frequency limits are not exceeded.