Question about the generator torque- and pitch controller

Dear Lars,

I’m glad to hear that you fixed the problem with your Simulink model.

I think you are getting different gains between those published for the NREL 5-MW turbine and those derived following the procedure described in the “Advanced Control Design for Wind Turbines” technical report for two reasons:

*The NREL 5-MW control gains are based on generator speed error whereas the “Advanced Control Design for Wind Turbines” technical report is based on rotor speed error. This leads to a factor of the gearbox ratio (97:1 for the NREL 5-MW turbine) between the gains using the two methods. With this factor, your results are within about 20% of the published values for the NREL 5-MW turbine.
*The remaining differences are likely the result of the fact that the gains for the NREL 5-MW turbine were derived using a customized version of FAST that employed a frozen wake assumption during linearization, which is described more in the following forum topic: Gain Scheduling.

I hope that helps.

Best regards,