【摘要】 混沌振荡是有别于系统失稳的另一种影响电网安全的因素。文章具体描述了电网混沌振荡现象的发生机理并区分了混沌振荡和系统失稳的差异。通过对一非线性电力系统振荡模型的分析 ,利用动力系统分岔理论 ,证实了仅有阻尼而无周期性负荷扰动 ,则系统不会出现混沌振荡 ;在受到较大的周期性负荷扰动时 ,则系统将出现混沌振荡 ;在周期性负荷扰动下 ,当阻尼系数接近某个数值时 ,系统也将出现混沌振荡。作者还获得了系统发生混沌振荡的参数条件 ,从而为大偏差状态下保障电力系统稳定运行提供了理论依据和计算方法。更多还原

【Abstract】 Chaotic oscillation is such a factor which can also affect power system security but differs from the loss of stability. In this paper the mechanism causing chaotic oscillation is described and the difference between chaotic oscillation and loss of stability is distinguished. Using bifurcation theory of dynamic systems the result of analysis on a nonlinear model of power system oscillation shows that only under the damping the chaotic oscillation will not occur without periodic load perturbation, and the chaotic oscillation will occur under stronger load perturbation when a certain value of damping coefficient is attained. Some conditions of parameters are obtained under whichthe chaoticoscillation of power systemappears, thereby, the theoretical basis and calculation method for the control of nonlinear system isoffered to ensure thestable operation of power system under large deviation state.更多还原