flasc.utilities.lookup_table_tools

flasc.utilities.lookup_table_tools#

Module for creating interpolants from lookup tables.

Functions

get_yaw_angles_interpolant

Get an interpolant for the optimal yaw angles from a dataframe.
flasc.utilities.lookup_table_tools.get_yaw_angles_interpolant(df_opt, ramp_up_ws=[4, 5], ramp_down_ws=[10, 12], minimum_yaw_angle=None, maximum_yaw_angle=None)[source]#

Get an interpolant for the optimal yaw angles from a dataframe.

Create an interpolant for the optimal yaw angles from a dataframe 'df_opt', which contains the rows 'wind_direction', 'wind_speed', 'turbulence_intensity', and 'yaw_angles_opt'. This dataframe is typically produced automatically from a FLORIS yaw optimization using Serial Refine or SciPy. One can additionally apply a ramp-up and ramp-down region to transition between non-wake-steering and wake-steering operation.

Parameters:

  • df_opt (pd.DataFrame) -- Dataframe containing the rows 'wind_direction', 'wind_speed', 'turbulence_intensity', and 'yaw_angles_opt'.

  • ramp_up_ws (list, optional) -- List with length 2 depicting the wind speeds at which the ramp starts and ends, respectively, on the lower end. This variable defaults to [4, 5], meaning that the yaw offsets are zero at and below 4 m/s, then linearly transition to their full offsets at 5 m/s, and continue to be their full offsets past 5 m/s. Defaults to [4, 5].

  • ramp_down_ws (list, optional) -- List with length 2 depicting the wind speeds at which the ramp starts and ends, respectively, on the higher end. This variable defaults to [10, 12], meaning that the yaw offsets are full at and below 10 m/s, then linearly transition to zero offsets at 12 m/s, and continue to be zero past 12 m/s. Defaults to [10, 12].

  • minimum_yaw_angle (float, optional) -- The minimum yaw angle in degrees. Defaults to None. If None, the minimum yaw angle is set to the minimum yaw angle in the dataset.

  • maximum_yaw_angle (float, optional) -- The maximum yaw angle in degrees. Defaults to None. If None, the maximum yaw angle is set to the maximum yaw angle in the dataset.

Returns:

An interpolant function which takes the inputs

(wind_directions, wind_speeds, turbulence_intensities), all of equal dimensions, and returns the yaw angles for all turbines. This function incorporates the ramp-up and ramp-down regions.

Return type:

LinearNDInterpolator