基于风电不确定性的电力系统机电暂态过程  

Electromechanical Transient Process of Power System Based on Uncertainty of Wind Power

作　　者：张波 蒋海军 

机构地区：[1]国网安徽芜湖县供电有限责任公司,安徽芜湖241000 [2]江苏威信电气科技有限公司,江苏南京210000

出　　处：《电网与清洁能源》2016年第4期44-51,共8页Power System and Clean Energy

基　　金：国家基金资助项目(61104045)~~

摘　　要：随着风电功率的随机性对电力系统稳定性的影响愈发突出,如何分析含动态随机激励的电力系统暂态稳定性,对电力系统的动态安全具有重要意义。基于随机微分方程理论,提出了计及风电不确定性的电力系统模型,讨论了不同风力发电机在风速波动下的随机动态并网模型。通过双机无穷大系统和3机9节点系统对系统的静态及动态稳定性进行了分析。仿真结果表明,风电不确定性一定程度上会恶化系统的暂态稳定性,同时会引起长期无法消除的低频振荡,由不确定性产生的波动而造成的系统震荡会加剧并网造成的危害。ABSTRACT：With ever-increasing influence of wind power on the stability of power systems,how to analyze the transient stability of power systems containing dynamic stochastic excita-tion is of great significance to the dynamic security of power systems. Based on the theory of stochastic differential equations, this paper proposes a model of power system considering wind power uncertainty and discusses the stochastic dynamic grid-connected models of different wind turbine generators under wind speed fluctuations. The static and dynamic stability of the system are analyzed through the 2-machine-infinite-bus system and the 3-machine 9-node system. The simulation results show that uncertainties of wind power deteriorates the transient stability of the system to a certain extent and also causes low frequency oscillations which cannot be eliminated for a long time. The system oscillations caused by the fluctuations genera-ted by the uncertainties will aggravate the damages caused by integration with the power grid.

关 键 词：风电 不确定性 电力系统 机电暂态 

分 类 号：TM71[电气工程—电力系统及自动化]