In　this　paper,　a　speed-adaptive　full-order　flux　observer　for　sensorless　vector　control　of　doubly-fed　induction　generators　(DFIGs)　is　proposed.　The　observer　is　a　simulation　of　the　full-order　electrical　model　of　DFIGs　with　feedback　of　the　rotor　current　estimation　error　and　a　speed　adaptation　loop.　The　observer　gains　are　selected　based　on　a　stability　analysis　and　validated　by　the　linearized　closed-loop　observer　model.　Simulation　results　demonstrate　desired　steady-state　and　dynamic　performance　of　this　sensorless　control　approach　for　DFIG-based　variable　speed　wind　turbines.　©2009　IEEE.