为促进利用广域测量系统(WAMS)分析互联电网低频振荡问题,综述了基于受扰轨迹的低频振荡模式估计的最新研究成果.根据电网的不同扰动将低频振荡分为三类:自由振荡、随机振荡和强迫振荡.回顾了基于系统受扰轨迹的三类振荡模式估计方法,重点介绍了自由振荡和随机振荡的参数模型方法和非参数化方法.在评述各类方法的基础上,讨论了受扰轨迹选择、模型定阶、振荡振型分析及阻尼控制等方面存在的问题及有望突破的研究方向,以促进该领域的进一步发展.%To promote the analysis of low frequency oscillations in interconnected power grids based on wide area measurement system(WAMS), the latest research results on mode estimation of low frequency oscillations using disturbed trajectories are summarized. According to different disturbances, low frequency oscillations are classified into three categories: free oscillations, stochastic oscillations and forced oscillations. Disturbed trajectories based mode estimation methods of three kinds of oscillations are reviewed respectively, parameter model method and non-parametric method of free oscillations and stochastic oscillations are introduced in detail. Based on reviewing various methods, several key technical issues such as disturbed trajectory selection, model order determination, mode oscillation estimation, damping control as well as the main development trends are pointed out to solve the practical problems and motivate further development.
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