中文摘要：

故障分量方向元件是方向比较式纵联保护的重要组成部分，但风电大规模接入破坏了传统故障分量方向元件的最佳应用环境。为了研究双馈风电机组对故障分量方向元件的影响，提出了等效序突变量阻抗的概念，基于双馈风电机组暂态模型，推导了等效序突变量阻抗的解析表达式；针对故障后投入撬棒与变换器控制两种工况研究了双馈风电机组等效序突变量阻抗的相角变化特征；进而分析了双馈风电机组对不同故障分量方向元件的影响机理，指出等效序突变量阻抗相角的大范围变化可能造成故障分量方向元件的灵敏性不足或者误判，最后通过仿真实验验证了分析的正确性。

英文摘要：

Direction relay based on fault components is the key part of directional comparison pilot protection, but its best application environment is broken when large scale of wind power integrate into power system. To analyze the effect of doubly fed induction generator （DFIG） on direction relay based on fault components, this paper presented the concept of equivalent sequence superimposed impedances （ESSIs）. Based on the transient model of DFIG; the analytic expressions of ESSIs were deduced, and their phase angle characteristics were studied in the cases of DFIG with crowbar protection and converter control after thult occurred. Then the impact mechanism of DFIG on different direction relays based on fault components was analyzed. It is pointed out that the large range varying of phase angle of ESSIs may cause the low sensitivity or maloperation of direction relay based on fault components. The theoretical analyses were verified by simulation results.