Unlike the distribution mode adopted in the foreign countries

most of the large-scale wind farms are connected to the grid in China. Due to the randomness and fluctuation of wind

the improvement of accuracy of operation status of wind farm model is of great importance in the study of influence of grid connected wind farm to the grid. In this paper

an improved K-means algorithm is proposed to achieve the equivalent model of the wind farm with the output power before the initial fault as the cluster index for the FSIG wind farm. For the FSIG turbine in a wind farm cluster

the related equivalent parameter is calculated by the equivalent method which is based on capacity weighted. Finally

the detailed model of FSIG wind farm and its equivalent model are setup with PSCAD/EMTDC as simulation platform. The output active power of wind farm and reactive power dynamic variation curve trajectory at stable operation and fault condition is studied by the simulation;The celerity and accuracy of the equivalent method proposed is verified.