In China, wind power curtailment is very common. For geting a more accurate wind farm model, a new wind farm model of DFIG considering wind power curtailment is proposed. This method takes both wake effect and the order from power dispatchers into account, to make power coefficient as a classification index, a multi-machine dynamic equivalence model with DFIG is built, the run time of this model is less. Classification index is easy to get and the model is more similar to actual operation situation. By establishing models on PSCAD platform, the results show that the proposed equivalent model can more accurately describe the output of the detailed model under both steady state and transient state.