This paper studies the voltage vulnerability of the power system with wind farm, with emphasis on calculating the index of node voltage vulnerability. In this paper, the wind farm is regarded as a random disturbance source, so the system is divided into different operating conditions according to the change of wind speed. Then node voltages of the power system with wind farm in different wind conditions are calculated by power flow calculation, critical voltage is calculated by preserving nonlinear flow algorithm (PNFA) integrating the optimal multiplier, and the index of nodes voltage vulnerability is calculated in the end. The simulation of the IEEE 14 bus system with wind farm is carried out. The effect of power system with wind farm on node voltage vulnerability is evaluated by comparing the effects of node voltage vulnerability index and different parallel points on the vulnerability and vulnerability ranking.%含风电场的电力系统节点电压脆弱性的研究,重点在于节点电压脆弱度指标的计算.将并网运行的风电场视作具有随机性的扰动源,根据风速变化将风电场运行划分成不同的扰动状态,通过潮流计算得出含风电场的电力系统在不同风速条件下的节点电压值,并采用引入优化乘子的保留非线性潮流法(preserving nonlinear flow algorithm,PNFA)计算节点临界电压,进而求取节点电压脆弱度指标.对引入风电场的IEEE14母线系统进行仿真计算,并通过对比求得的节点电压脆弱度指标以及不同并网点对脆弱度及脆弱度排序的影响,充分评估风电场的并网运行对系统节点电压脆弱性的影响.
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