Dear Jason sir,
I have been using the linearization function in the Fast v7 and Open fast for land-based and TLP-floating turbines. I have noticed that the feedthrough values are always zero for the collective pitch to generator speed loop and the wind disturbance to generator speed. This is creating a problem for me while designing a feedforward MPC controller. Is this inherent to FAST or can be changed to yield non-zero D matrix values? Thanks in advance.
Best Regards
Dear @Nitin.Sivakumar,
This is probably not too surprising because perturbations in blade pitch or wind speed will result in a direct change in aerodynamic torque, and thus, rotor acceleration, but it would take a time step for this acceleration to result in a rotor speed change.
Best regards,
Dear sir,
But how can this be not seen in the linearized model from GH Bladed
I’m not sure I understand your question.
Dear Sir,
What I meant is that previously I was using GH Bladed for getting the linearized models. At that time the D matrix values for the channels I previously mentioned did not come to be zero. This confused me.
Sounds like a better question for Bladed technical support.
Dear sir,
Thanks for your reply.
Best Regards