风电场极限切除时间的确定及影响因素分析

Estimation of the critical clearing time of wind farms and analyses of influence factors

随着电网中风电装机容量的增加,风电场的稳定问题已成为风电场接入电网研究的主要问题之一。电网故障时风电场的暂态稳定性通过其等值风电机组的极限切除时间(CCT)来表示。风电机组的参数、风电场与电网的连接方式以及风电场的运行等因素会影响风电场极限切除时间。以恒速风电机组为例分析了风电机组极限切除时间的确定以及轴系松弛过程对机组临界切除时间的影响;分析了影响恒速风电机组风电场极限切除时间的因素,并通过实际电网进行了仿真分析。

The stability of wind farms is the primal problem in the analysis of wind farm integration with the increment of wind farm penetration. The transient stability of wind famls is denoted by the critical clean time （CCT） of an equivalent wind turbine on the grid fault. The CCT of the wind farm is influenced by the mechanical and electrical parameters of wind turbines, the integration of wind farms to the power system, the running of wind farms, and so on. First, the CCT of a fix-speed wind turbine and the influence on the CCT by the relaxation of turbine shaft were determined. Second, many factors influencing the CCT of the wind farm consisted by fix-speed wind turbines were studied by simulation in this paper. Finally some useful conclusions weoe educed.