The thesis focuses on wind farm consisting of doubly fed induction generators, considering the equivalence of wind power generator and collector network, put forward two models, study the combination model of single weighted equivalent and equivalence power loss, the combination model of reduced-order re-scaled and parallel connection aimed transformation. Regarding the wind turbine generator system with identical parameters, using PSCAD/EMTDC to establish the different equivalent model of wind farm, a comparative analysis of the transient characteristics of wind velocity perturbation and the voltage drop of PCC, the results verify the validity of the equivalent model.