Doubly-fed　induction　generator　(DFIG)　is　an　asynchronous　generator　with　three-phase　excitation　winding　structure.　It　can　produce　voltage　in　constant　frequency　when　its　rotor　runs　in　invariable　speed.　In　this　paper,　the　Park＇s　Transformation　is　used　to　infer　the　model　of　DFIG　in　the　dq　coordinate　system,　in　order　to　decouple　the　control　of　active　and　reactive　power.　By　using　grid　voltage　directional　vector　control　with　feedforward　compensation,　the　strategy　realized　constant　frequency　output　of　DFIG　in　variable　speed　and　power　decoupling　control.　Simulation　results　show　that　the　control　strategy　has　a　good　effect　on　obeying　the　power　command,　and　achieves　constant-frequency　output　under　varying　wind　speed.　©　2020　IEEE.