Decoupling　between　torque　and　stator　flux　linkage　is　necessary　to　achieve　the　quick　and　smooth　control　for　output　DC　voltage　of　permanent　synchronous　generating　system　based　on　direct　torque　control　(DTC).　Firstly,　a　nonlinear　mathematical　model　with　state　variables　of　torque　and　square　of　stator　flux　linkage　amplitude　was　deduced　according　to　the　state　equations　of　stator　current　and　flux　linkage　in　static　coordinate　frame　in　this　paper.　Secondly,　the　stator　voltage　mathematical　model　was　constructed　with　the　output　variables　of　torque　and　square　of　stator　flux　linkage　amplitude　by　the　input-output　linearization　method　according　to　the　deduced　nonlinear　model.　Thirdly,　the　input　control　variables　of　linearized　system　was　designed　on　the　track　control　demands　for　toque　and　stator　flux　linkage,　and　on　which　the　given　stator　voltage　vector　was　calculated.　At　last,　the　space　voltage　vector　modulation　(SVVM)　was　applied　to　obtain　the　dynamic　decoupling　control　between　the　torque　and　stator　flux　linkage.　The　experimental　results　show　that　the　generating　system　with　the　proposed　control　strategy　has　the　ideal　tracking　performance　of　torque　and　stator　flux　linkage　with　small　ripples　of　torque　and　current,　and　the　output　DC　voltage　is　modulated　quickly　and　smoothly.　©　2012　Chin.　Soc.　for　Elec.　Eng.