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合理的风电场等值建模是风电并网研究与运行的基础.双馈风电机群中各机组的正常运行状态、控制器暂态响应、保护动作情况可能不同,单个双馈感应发电机(doubly fed induction generator,DFIG)的暂态特性不能代表机群的整体特性.电力系统保护和控制的实施仍需解决风电机群暂态等值模型的欠缺.基于DFIG故障暂态过程的行为特征,充分考虑DFIG短路电流的特征信息,建立短路电流包络线轨迹结构相似度的评价指标,提出基于轨迹结构相似度的电磁暂态同调机群划分方法.算例表明,该方法能够有效辨别DFIG暂态过程的差别,满足电磁暂态分析机群等值的需求,且原理简单,易于实现.“,”The reasonable modeling of a wind farm is the basis of power system research and operation.The transient characteristics of a single doubly-fed induction generator (DFIG) cannot reflect the overall characteristics of a wind farm because the normal conditions,transient response of controllers,protection operation of DFIGs can be different in the wind farm.The equivalent model of a doubly-fed wind farm needs to be studied for the protection and control of power systems.The feature information of short-circuit currents of a DFIG was excavated based on its transient behaviors.The evaluation indexes of structure similar degree were built for the envelope curve of short-circuit currents.A clustering method based on the similar degree was proposed to distinguish coherent DFIGs in the wind farm.The simulations indicated that the proposed method can effectively recognize the differences among the transient processes.The method meets the requirements of transient analysis and has the advantages of easy implementation.