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基于映射弹性势能增量的电网主振荡路径识别 被引量:2

Main oscillation path identification of power grid based on mapping elastic potential energy increment
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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将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: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。 The boundary fluctuation of the actual power grid will cause the low-frequency oscillation,and the severe oscillation of some lines under the main oscillation path will seriously threaten the security and stability of the power grid.Therefore,the paper proposes an identification method of the main oscillation path under the boundary disturbance of the power grid.By comparing the similarities between power system and elastic mechanical system,the power grid is mapped into an elastic network,and a dynamic model of elastic mechanics 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 systems under power oscillation are analyzed.Combined with the interaction and distribution characteristics of the network energy,the path oscillation index is established,and an identification method of main oscillation paths is proposed.The simulation results show that the dynamic mapping between power system and elastic mechanical system is reasonable,and the identification of main oscillation path is effective.The presented method is helpful to understand the physical process of low-frequency oscillation in power systems,and provides references to the relevant measures to suppress oscillation.
作者 路广才 竺炜 唐颖杰 LU Guangcai;ZHU Wei;TANG Yingjie(School of Electrical&Information Engineering,Changsha University of Science&Technology,Changsha 410114,China;Xining Power Supply Company,State Grid Qinghai Electric Power Company,Xining 810000,China)
出处 《电力科学与技术学报》 CAS 北大核心 2022年第6期25-34,共10页 Journal of Electric Power Science And Technology
基金 国家自然科学基金(52077009) 湖南省教育厅重点项目(20A013)。
关键词 低频振荡 弹性力学动态模型 势能增量 主振荡路径 FLOYD算法 low frequency oscillation dynamic model of elastic mechanics potential energy increment main oscillation path Floyd algorithm
作者简介 通信作者:竺炜(1968-),男,博士,教授,主要从事电力系统稳定分析与控制研究,E-mail:zhu8911@aliyun.com。
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