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This paper proposes a novel discrete-time direct torque and flux control (DTFC) scheme for a permanent magnet synchronous generator (PMSG) used in a variable-speed direct-drive wind power generation system. The proposed DTFC does not rely on machine parameters, such as the inductances and permanent-magnet flux linkage, while the main advantages of the DTC, e.g., fast dynam ic response and no need of coordinate transform, are preserved. The stator flux linkage is estimated by an adaptivedoi:10.1109/ias.2013.6682528 dblp:conf/iasam/ZhangZQQ13 fatcat:7dv3edherfb2dontsjwcqlhow4