Tum misalignment model #832
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… use with TUMLossTurbine operation model).
…all dummy misalignment in case both yaw and tilt are 0. This was causing a division by zero in the tests.
…n calling TUMLossTurbine.control_trajectory() so that rated power stays independent from air_density
… for the NREL 5MW, so that they can be run with the tum-loss model. The respective yaml files have been modified to include the necessary model parameters.
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TUM misalignment model
This is a proposal to include the misalignment model developed by TUM to floris v4. The methodology is based on the preprint available currently at https://wes.copernicus.org/preprints/wes-2023-133/ .
The model is coded into simulation/turbine/operation_models.py . It consists of the usual power(), thrust(), axial_induction() functions. There are two extra functions called compute_local_vertical_shear() and control_trajectory().
The model requires a few new inputs that were added to the power_thrust_table in the yaml file. It also requires the cp-pitch-tsr curves for the turbine model considered. An .npz file is added to the turbine_library folder, as well as a file iea_3mw.yaml file ready for use with the model. This file refers to the IEA 3 MW reference turbine by Bortolotti et al. (2019). In the future, more wind turbine models could be added.
The model accepts power_setpoints inputs in watts to simulate derating.
The model allows also to obtain the pitch and tip speed ratio of the wind turbine. Right now the code is printing the values of tip speed ratio and pitch to screen. This could be removed for clarity, but get_pitch() and get_tsr() functions could be coded (?).
Related issue
Impacted areas of the software
simulation/turbine/operation_models.py
Additional supporting information
The model seem to work well with the examples, but it crashes at wind speeds higher than 18 m/s, because the operating tip-speed-ratio gets too low.
In the tum model, the tilt is negative when tower clearance is created. This seems conflicting with floris convention, so there is a sign change at the start of the power(), thrust() and axial_induction() functions.
Sorry if something is wrong, this is the first time I work with github.
Test results, if applicable