基于映射弹性势能增量的电网主振荡路径识别
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1.长沙理工大学 电气与信息工程学院;2.国网青海省电力公司西宁供电公司

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国家自然科学基金(52077009);湖南省教育厅重点项目(20A013)


Main oscillation path identification of power grid based on mapping elastic potential energy increment
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Affiliation:

1.College of Electrical Information Engineering,Changsha University of Science and Technology;2.State Grid Qinghai Electric Power Company Xining Power Supply Company

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    摘要:

    实际电网的边界波动会激起低频振荡,主振荡路径下的若干线路振荡剧烈,严重影响电网的安全稳定运行,故本文研究电网边界扰动下的主振荡路径识别方法。通过对比电力系统与弹性力学系统的相似性,将电网映射成弹性力学网络,构建了映射弹性力学动态模型,以力学视角分析电网的低频振荡现象。根据受迫振动的能量转换机理,分析了电力系统功率振荡时的能量转换特性。结合网络能量的交互及分布特征,建立了路径振荡指标,提出一种电网主振荡路径的辨识方法。算例仿真结果证明了电力系统与弹性力学系统动态映射的合理性及主振荡路径辨识方法的有效性。本文结论有益于理解电力系统低频振荡的物理过程,且对开展相关抑制振荡措施的研究具有参考价值。

    Abstract:

    The boundary fluctuation of the actual power grid will cause low-frequency oscillation, and the oscillation of some lines under the main oscillation path is severe, which seriously affects the safe and stable operation of the power grid. Therefore, this paper studies the identification method of the main oscillation path under the boundary disturbance of the power grid. By comparing the similarities between power system and elasticity system, the power grid is mapped into elasticity network, and the dynamic model of elasticity is constructed to analyze the low-frequency oscillation of power grid from the perspective of mechanics. According to the energy conversion mechanism of forced vibration, the energy conversion characteristics of power system under power oscillation are analyzed. Combined with the interaction and distribution characteristics of network energy, the path oscillation index is established, and an identification method of main oscillation path is proposed. The simulation results show that the dynamic mapping between power system and elastic system is reasonable and the identification method of main oscillation path is effective. The conclusion of this paper is helpful to understand the physical process of low-frequency oscillation in power system, and has reference value to carry out the research of related measures to suppress oscillation.

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  • 收稿日期:2021-03-19
  • 最后修改日期:2021-05-04
  • 录用日期:2021-05-19
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