I am doing my master thesis and have come across a problem that I lack the knowledge to answer. I aim to simulate near-realistic wind fields and their effects on a wind turbine. I use a site-specific spectral model to create a wind field, then using .bts format analyze the resulting loads on FASTv8. Here, we have come across an interesting effect and hypothesize the following.
We notice drop in the generator power and torque for wind speeds above rated (please refer the plot provided), we were wondering if this behavior is due to switching of the controller in the transition between the pitch-controller and the torque-controller?
Your opinion on this would be highly appreciated.
MSc. Sustainable energy technology - Wind energy