With large scale wind farm integration, the effect of wind farm dynamic equivalent model accuracy is increasing on power system dynamic and transient stability, so the traditional equivalent and multi-group method can't meet requirement of some studies. Therefore, due to the deficiency of traditional wind farm equivalent method, a new multi-group method is proposed in this paper. Wind farms dispersity and wind turbines difference have been both considered in this method. When grouping wind farm turbines, based on that, a modified wind farm dynamic equivalent model is proposed using coherency method. For the contrastive analysis, three traditional equivalent models are built too, and simulated research of single, two and three phases short circuit is proceeded. Using relative error index of active power, reactive power and bus voltage, dynamic characteristics contrastive analysis of four equivalent models including the proposed model is preceded too. The superiority of this proposed method is verified by simulation results, and dynamic characteristics of the proposed model located on the parallel point are more close to that of real wind farm.
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