中文摘要：

双馈感应风机（doubly-fed induction generator,DFIG）暂态等值模型成为近年来继电保护工作者的研究焦点之一。针对双馈风机投入撬棒这一运行工况,在分析转子磁链变化过程的基础上,定量研究了双馈风机暂态电势的变化特性。指出由于转差的存在,暂态电势中出现了转差频率交变分量;撬棒电阻的投入,加快了暂态电势中衰减分量的衰减速度。使得双馈风机的暂态电势呈现出快变特性,不同于传统同步发电机暂态电势慢变的特点,并通过仿真验证了理论分析的正确性。为进一步的双馈风机暂态等值模型的建立及风电场保护策略的研究提供理论依据。

英文摘要：

In recent years the equivalent transient model of doubly fed induction generator （DFIG） becomes one of the research foci related to protective relayings. For the operating condition of DFIG in which the crowbar circuit is put into use, on the basis of analyzing variation process of rotor flux linkage the variation characteristic of DFIG＇s transient EMF is quantitatively researched. It is pointed out that due to the slip there is alternating component with slip frequency in the transient EMF; the attenuation speed of the decaying component in the transient EMF is accelerated by putting the crowbar resistance into use, so it make the transient EMF of DFIG appearing the feature of rapid decay and it is different from the slow decay feature of transient EMF in traditional synchronous generators. The correctness of the theoretical analysis is validated by simulation. Result of this research is available for reference to the follow-up establishment of equivalent transient model for DFIG and the research On protection strategy for wind farms.