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Table 1: System parameters.

Rated power 1 [MW] Blade radius 37.38 [m] Air density 0.55 [kg/m3] Rated wind speed 12.35 [m/s] Cut-in speed 4 [m/s] Cut-out speed 25 [m/s] Blade pitch angle 0° Rated line ac voltage 230 [V] AC rated current 138 [A] DC rated current 239 [A] Rated load power 40 [kW] The inertia of SG 1.11 [kg m2] Rated power of IG 55 [kW] The inertia of the IG 1.40 [kg m2] Torsional damping 0.557 [Nm/rad] Rotor resistance of SG 0.96 [Ω] Stator d-axis inductance of SG 2.03 [mH] Rotor inductance of SG 2.07 [mH] d-axis field mutual inductance 1.704 [mH] The transient open circuit time constant 2.16 [ms]