I am rather new to OpenFast. Currently I am working on a OpenFast model of a wind turbine similar to the AOC 15/50 which is used in the OpenFast r-tests. Currently I am working on the controller of the model but I am unsure about the right approach.
ServoDyn offers different possibilities for the controller. With the variable speed control and simple generator model I did not get the desired results yet.
A different option I tried is the Bladed-style DLL with the DISCON controller. I tried adapting the NREL 5MW Discon controller to the much smaller wind turbine model by making adjustments within the Fortran code and compiling a new dll file. So far I did not receive stable result in the pitch controller with the Bladed-style DLL. I am also not sure if this approach of making adjustments within in the Fortran code is the common approach to work with the Bladed-style DLL controller.
The available data of the generator I would like to model is very simple with 2 linear non-zero segments. Above the rated generator speed the pitch control sets in to limit the generator speed. Is there a common work flow for the modeling of the generator and controller with OpenFast?