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In the context of new-type energy generation replacing traditional energy sources and a large number of inverters and other power devices replacing traditional SGs, the “double-high” characteristic is still an important part of system stability analysis. In the past, the small-signal stability analysis of power systems mainly focused on the small-signal modeling and analysis of SGs and their control systems, and after a large number of inverters appeared in the power grid, the small-signal modeling and analysis of these power electronic devices were gradually developed. In this paper, to analyze the interaction between physical inertia and virtual inertia, a small-signal model of the VSG-SG interconnected system is constructed for the study of low-frequency oscillations of power grids, and based on this model, the differences and connections between VSG and SG affecting the low-frequency oscillation phenomena inherent to the system's operational dynamics are compared, to reveal the mechanisms of the VSG participating in the low-frequency oscillations of the power grids.

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Modal Analysis of Low-Frequency Oscillations in Power Systems Based on Small-Signal Analysis Considering the Interaction of Physical and Virtual Inertia

  • 会议论文

  • 发表日期：

    2025年

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  • Qingshan Liu,
  • Shengyang Lu,
  • Jing Li,
  • Hiroshi Yokoi,
  • Yiming Ma,
  • Jia Liu,
  • Haixin Wang,
  • Junyou Yang

摘要

In the context of new-type energy generation replacing traditional energy sources and a large number of inverters and other power devices replacing traditional SGs, the “double-high” characteristic is still an important part of system stability analysis. In the past, the small-signal stability analysis of power systems mainly focused on the small-signal modeling and analysis of SGs and their control systems, and after a large number of inverters appeared in the power grid, the small-signal modeling and analysis of these power electronic devices were gradually developed. In this paper, to analyze the interaction between physical inertia and virtual inertia, a small-signal model of the VSG-SG interconnected system is constructed for the study of low-frequency oscillations of power grids, and based on this model, the differences and connections between VSG and SG affecting the low-frequency oscillation phenomena inherent to the system's operational dynamics are compared, to reveal the mechanisms of the VSG participating in the low-frequency oscillations of the power grids.