What is the logical range of baseline controller frequency for OC3Hywind?
I mean min and max of period of time that actuator must acts? or it has arbitrary frequency?
Any other Infos will be great in this case.
Dear Mehdi,
The baseline controller for the OC3-Hywind system is similar to the baseline controller for the NREL 5-MW turbine (as documented in: nrel.gov/docs/fy10osti/47535.pdf). The only input used by the baseline controller (including both the generator-torque and blade-pitch controllers) is the low-pass-filtered generator speed. This low-pass filter has a corner frequency of 0.25 Hz, so, there will be little frequency response of the controller higher than 0.25 Hz. The baseline blade-pitch controller has a characteristic response frequency. For the land-based NREL 5-MW turbine this characteristic response frequency is 0.6 rad/s = 0.095 Hz, but for the OC3-Hywind system this characteristic response frequency = 0.2 rad/s = 0.032 Hz.
I hope that helps.
Best regards,
Dear Jason sir,
I wanted to know the bandwidth (gain crossover frequency) for the Nrel baseline pitch controller used for land based wind turbine. I tried to get the bode plot for the Nrel controller in matlab simulink using model linearisation toolbox, but it is not giving correct response, maybe due to the switching and gain scheduling involved. So is the bandwidth calculated for Nrel pitch controller?
Thanks and regards
Dear Jason sir,
Another question I have is regarding the baseline pitch controller in above rated operation for TLP floating NREL 5 MW turbine. My understanding is that there is no specific controller designed for TLP turbine( like the PI gains detuned controller for OC3) , and it is same as the land based turbine controller available. If so is there any provision to simulate the TLP turbine to see the load change using conventional onshore controller and offshore controller. Please excuse if my doubt is trivial.Thanks in advance.
Best Regards
Dear @Nitin.Sivakumar,
I have not generated a Bode plot of the baseline controller for the NREL 5-MW wind turbine and I’m not sure why you are unable to generate one, but I would say that the bandwidth is tied to the low-pass filter on the generator speed input to the controller (0-0.25 Hz).
I’m not sure I understand your second question, but I agree that no modification was made to the land-based controller for applicability to the MIT/NREL TLP.
Best regards,