Transient Synchronization Stability of an Islanded AC Microgrid Considering Interactions Between Grid-Forming and Grid-Following Converters
Transient Synchronization Stability of an Islanded AC Microgrid Considering Interactions Between Grid-Forming and Grid-Following Converters
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DOI：
10.1109/jestpe.2023.3271418
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发表时间：
2023-08
影响因子：
5.5
通讯作者：
Zhen Tian;Xilin Li;X. Zha;Yingjie Tang;P. Sun;Meng Huang;Pan Yu
中科院分区：
文献类型：
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作者：
Zhen Tian;Xilin Li;X. Zha;Yingjie Tang;P. Sun;Meng Huang;Pan Yu
微网以其运行灵活、可靠性高等优点，在分布式可再生能源并网中得到了迅速发展。在没有主电网频率支持的情况下，孤岛运行模式下的微电网更容易在大信号干扰下失去稳定性。然而，以往的研究主要集中在弱电网条件下，忽略了不同类型的变流器之间的相互作用的影响。因此，本文研究了孤岛交流微电网的暂态同步稳定性，考虑电网形成转换器（GFMC）和电网跟随转换器（GFLC）之间的动态相互作用。首先，建立了孤岛微网的简化非线性模型，揭示了非线性相互作用和阻尼对系统稳定性的影响。基于无源性原理和LaSalle定理，给出了一个显式的稳定性判据，揭示了系统的失稳机理。利用所提出的稳定性判据，分析了系统参数对系统稳定性的影响，为参数优化以提高系统稳定性指明了方向。为了验证所提出的方法的有效性，仿真和实验进行。
Microgrid has been rapidly developed for the integration of distributed renewable energy, owing to their superiority of flexible operation and high reliability. Without frequency support from the main grid, the microgrid under islanded operating mode is more likely to lose stability in the presence of large-signal disturbances. However, previous studies mainly focus on weak grid conditions and ignore the interaction effects between different-type converters. Therefore, this article investigates the transient synchronization stability of an islanded ac microgrid considering dynamic interactions between grid-forming converter (GFMC) and grid-following converter (GFLC). First, a simplified nonlinear model of the islanded microgrid is established, which reveals the nonlinear interaction and damping impact on system stability. Based on the passivity principle and LaSalle ’ s theorem, an explicit stability criterion is formulated to reveal the instability mechanism. With the proposed stability criterion, the impacts of different system parameters are analyzed, which points out the direction of parameter optimization to enhance stability. To validate the effectiveness of the proposed method, simulations and experiments are carried out.