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<p>The virtual synchronous generator (VSG) has attracted significant attention for its ability to provide inertia and damping in microgrids. However, complex grid environment and nonlinear control factors can cause traditional pre-synchronization strategies to fail, compromising microgrid safety. This paper proposes a novel pre-synchronization strategy for VSG based on linear active disturbance rejection control (LADRC). To achieve phase-locked loop-free pre-synchronization, the phase angle controller inputs are derived from virtual power. Furthermore, a universal phase compensation limiter, utilizing the microgrid’s actual frequency, is designed to effectively constrain microgrid frequency variations. A small-signal model of the LADRC-based pre-synchronization loop is established, facilitating rapid controller parameter tuning based on its dynamic characteristics. Detailed implementation and analysis of the strategy are presented. Simulation and hardware-in-the-loop experimental results demonstrate that the proposed strategy effectively limits microgrid frequency variation, reduces the current synchronization time, and improves active power dynamic performance.</p>

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Enhanced VSG grid synchronization: a virtual power approach with linear active disturbance rejection control

  • 期刊论文

  • 发表日期：

    2026年2月17日

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  • Yichuan Zhong,
  • Damin Zhang,
  • Hanchao Zeng,
  • Qiang Zhang,
  • Yifeng Chen

摘要

The virtual synchronous generator (VSG) has attracted significant attention for its ability to provide inertia and damping in microgrids. However, complex grid environment and nonlinear control factors can cause traditional pre-synchronization strategies to fail, compromising microgrid safety. This paper proposes a novel pre-synchronization strategy for VSG based on linear active disturbance rejection control (LADRC). To achieve phase-locked loop-free pre-synchronization, the phase angle controller inputs are derived from virtual power. Furthermore, a universal phase compensation limiter, utilizing the microgrid’s actual frequency, is designed to effectively constrain microgrid frequency variations. A small-signal model of the LADRC-based pre-synchronization loop is established, facilitating rapid controller parameter tuning based on its dynamic characteristics. Detailed implementation and analysis of the strategy are presented. Simulation and hardware-in-the-loop experimental results demonstrate that the proposed strategy effectively limits microgrid frequency variation, reduces the current synchronization time, and improves active power dynamic performance.