As the proportion of wind power installed capacity in the power grid is increasing, the impact of the short-circuit current supplied by the wind power generation system on the relay protection device can not be neglected when there is a problem in the operation of the power grid. When the grid voltage drop greatly,the crowbar protection action to the topological structure of the wind turbine to change this setting of relay protection device of wind power transmission lines of the calculation difficulty. This paper deduces the equivalent circuit of the wind power generator with crowbar protection action, together with the short circuit characteristics and short-circuit current calculation model of doubly fed wind generator. Finally, the validity of the model on line protection device setting calculation is verified in PSCAD simulation platform.%风电装机容量在电网中所占的比例不断增高,当电网运行出现故障时,不能忽略风电机组短路电流对继电保护装置所造成的影响.当电网电压大幅度跌落时,撬杠保护(Crowbar)动作使风力发电机组的拓扑结构发生变化,影响风电送出线路继电保护装置的整定计算.文章在推导撬杠保护动作时风电机组等值模型的基础上,分析得到双馈感应风力发电机组的短路特性以及用于短路电流计算的模型,最后在PSCAD平台下验证了模型进行线路保护装置整定时的有效性.
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