Postby Jason.Jonkman » Thu Mar 14, 2019 6:29 am
Dear Cheng,
My previous comment simply stated that I have seen combined blade-pitch and generator-torque controllers, but that the generator-torque is often used to mitigate drivetrain-torsion and tower-side-to-side vibrations. I would not expect control of the generator torque to have a strong influence on platform-pitch, but it may be useful to regulate rotor speed and power in Region 3 if the pitch controller is also tasked with mitigating platform pitch. I would suggest reviewing the literature on these matters. The work of Namik and Stol from around 2010 comes to mind, but there are likely many others as well.
Best regards,
Jason Jonkman, Ph.D.
Senior Engineer | National Wind Technology Center (NWTC)
National Renewable Energy Laboratory (NREL)
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