“…For a given effective wind speed v , it consists in synthesising the generator torque g T to adjust the rotor speed to its optimal value opt . The option of choosing g T as the control variable is justified by the fact that this last is quite easy to generate through swift and effective electric machine controllers using either vector control (Pena et al, 1996) or direct torque control (Arnalte et al, 2002). To test performance of the new introduced controllers, the well-known reference controllers ISC (Leithead & Connor, 2000;Wright, 2003) and ATF (Pena et al, 1996;Vihriälä et al, 2001;Johnson, 2004) are considered.…”