Dear Jonkman,

I got a problem in the evaluation of the parameters for the baseline control.

the parameters used are:

drivetrain inertia (Irot): 38,759,228 kgm2;

nominal rotor speed (w0): 12.1 RPM or 1.2671 rad/s (last value used in formula);

natural control frequency (wn): 0.6 rad/s;

damping (csi) : 0.7;

pitch sensitivity at 0 degrees (S0): 28.24*10^6 watt/rad;

when I try to use the formula:

Kp=2*Irot* wn* csi* w0/S0 = 1.4608;

Ki=Irot/wn^2* w0/S0 = 0.6261;

my values don’t match the values reported in: “Definition of a 5-MW Reference Wind Turbine for Offshore System Development” showing that:

Kp=0.01882681;

Ki=0.008068634;

and 1.4608/0.0188=0.6261/0.008= 77.6.

I can’t figure out why there is a difference between the numbers.

Can you explain me how Kp and Ki are computed in the paper?

thank you in advance

best regards

Massimo Sirigu