摘要
Complex phenomena such as prolongedly undamped ultra-low frequency oscillation(ULFO)and eigenmode re-excitation are observed in the simulations of hydroelectric power systems.Emphases are put on nonlinearities and mode interactions,which cannot be analyzed by traditional eigen-analysis methods.In order to investigate the mechanism of the evolvement of the nonlinear dynamic process in ULFO,this paper proposes a method to analyze the mode interactions quantificationally.First,a disturbed trajectory is decoupled into a set of time-varying components.Second,transfer matrices of eigenmodes are extracted along the trajectory.Third,consecutive sequences of eigenvalues and trajectories of components are formed by a proposed technique.Based on the decoupled components and transfer matrices,the mechanisms of mode interactions and inheritance relationships between eigenmodes are analyzed.The causes and developments of the above complex phenomena are revealed by the proposed method in a test two-machine system.Meanwhile,the accuracy of the eigenmode matching technique is verified in the New England system.
基金
supported by the Program of State Grid Corporation of China“Theoretical Basis
Algorithm
and Application of Trajectory Eigenvalue Method”
作者简介
Corresponding author:Yusheng Xue received the B.E.degree from Shandong University,Jinan,China,in 1963.He received the M.S.degree from State Grid Electric Power Research Institute,Nanjing,China,in 1981.He received the Ph.D.degree in electrical engineering from University of Liège,Liège,Belgium,in 1987.He is the member of Chinese Academy of Engineering,Honorary President of State Grid Electric Power Research Institute(NARI Group Corporation),and Professor in the Electrical Engineering Department,Shandong University.His research interest is power system automation.e-mail:xueyusheng@sgepri.sgcc.com.cn;Zijun Bin received the B.E.degree from Huazhong University of Science and Technology,Wuhan,China,in 2013.He received the Ph.D.degree in electrical engineering from Shandong University,Jinan,China.Currently,he is an Engineer at the Power Research Institute of State Grid Jiangsu Electric Power Company,Nanjing,China.His research interests include power system stability and control.e-mail:binzijun@gmail.com
