Because　the　wind　farm　grid-connected　analysis　model　cannot　satisfy　the　requirements　of　simulation　speed　and　accuracy　simultaneously,　it　is　not　conducive　to　research　the　interaction　between　large-scale　wind　farms　and　power　system.　Therefore,　establishing　a　wind　farm　equivalent　model,　which　can　accurately　represent　the　operation　characteristics,　is　very　important　to　research　the　stable　operation　of　power　system.　In　the　paper,　the　method　of　combining　principal　component　analysis　(PCA)　and　DBSCAN　is　adopted　to　establish　the　aggregated　model　of　permanent　magnet　synchronous　generator　(PMSG)　offshore　wind　farm,　and　the　MATLAB/Simulink　is　employed　to　do　the　simulation　verification.　The　result　shows　that　the　proposed　model　can　accurately　represent　the　dynamic　response　of　the　wind　farm.　Meanwhile,　the　model　has　good　equivalent　effect　under　the　conditions　of　wind　speed　fluctuation　and　short　circuit　fault.　©　2021　IEEE.