Dear Oriol,
I’m not really sure I understand your question. Is the result that the power is greater than 5 MW and the rotor speed is greater than 12.1 rpm not what you were expecting? The VSContrl = 1 (simple variable-speed control) option employs constant torque above rated, so, power will increase beyond 5 MW when the rotor speed increases beyond rated. If you switch to using the DISCON.dll supplied with the NREL 5-MW models, the torque controller employs constant power above rated, so, the power should remain at 5 MW regardless of the rotor speed beyond rated.
RotTorq is the same as LSShftTq and is discussed at length here.
Best regards,