This　paper　presents　the　modeling　and　maximum　power　tracking　strategies　for　of　variable　speed　constant　frequency　(VSCF)　doubly-fed　induction　generator　(DFIG)　system.　Firstly,　the　system　simulation　model　was　constructed　in　PSCAD.　The　grid-side　double　closed　loop　vector　control　strategy　is　used　to　maintain　a　constant　DC　bus　voltage　and　to　compensate　for　reactive　power　at　grid,　while　the　stator-flux-oriented　vector　control　is　adopted　in　rotor-side　converter　to　achieve　maximum　power　point　tracking　(MPPT)　for　the　DFIG　wind　turbine.　Secondly,　two　MPPT　methods　are　discussed　and　compared　for　various　operating　conditions.