不同风电机组并网对电力系统暂态电压稳定性的影响

Influence of different wind turbine generators integration to power system transient voltage stability

随着中国三北风电基地的初步建成,初步实现了大型风电场集中并网。但由于风电场始终处于电网的末端,场内机型不一,网架结构较弱,致使电网有功和无功波动,降低了电力系统暂态电压稳定性。针对上述问题,建立基于普通异步风力发电机组(AWT)、双馈异步风力发电机组(DFIG)的暂态数学模型,并以新疆某地区风电场作为实例,利用PSASP仿真软件分析这两类型风力发电机组以各种比例接入系统后的暂态电压稳定性。仿真结果以及临界故障清除时间(CCT)表明:并入电网的风电场DFIG占有量越多,系统的暂态电压相对越稳定。

With the Three-North wind power initially built,large-scale wind farm grid integration is initially implemented.But wind farms are always at the end of the power grid with different models and weaker grid structure.They result in fluctuating on active power and reactive power, and finally reduce power system transient voltage stability.Aimed at above issues,the transient mathematical model of the ordinary Asynchronous Wind Turbine（AWT）,Double-Fed Induction-Generator（DFIG）were established in this paper.Taking a certain area in Xinjiang as an example, the transient voltage stability of two wind power generator units were analyzed by PSASP simula-tion software.According to the simulation results and the critical fault clearing time （CCT）,it can be concluded that the more DFIGs integrated in power grid,the more stable relatively for power system transient voltage.