Hello,
I wanted to define a wind turbine design for a Siemens SWT-6.0-154, as I could not find it in the database.
It works fine until I try to change the "Maximum tip speed" to 88.7 m/s and the "Maximum tip speed ratio" to 6.8. Afterwards I get the following error message and the turbine power curve does not change accordingly:
equation engine: [32]: eval error in statement list\
fail: [wind_turbine_powercurve_windspeeds,wind_turbine_powercurve_powerout,wind_turbine_rated_wind_speed,wind_turbine_powercurve_err_msg,
wind_turbine_powercurve_hub_efficiency] = f( wind.turbine.radio_list_or_design,wind_turbine_powercurve_windspeeds_from_lib,wind_turbine_powercurve_powerout_from_lib,
wind_turbine_kw_rating_from_lib, wind_turbine_kw_rating_input,wind_turbine_rotor_diameter_input,wind_turbine_hub_ht,wind.turbine.elevation,wind_resource_model_choice,wind_turbine_max_cp,
wind.turbine.max_tip_speed, wind.turbine.max_tspeed_ratio,wind_turbine_cutin,wind_turbine_cut_out,wind.turbine.drive_train )
no variables calculated in a single iteration, cannot make progress!
eqn not evaluated: [wind_turbine_powercurve_windspeeds,wind_turbine_powercurve_powerout,wind_turbine_rated_wind_speed,wind_turbine_powercurve_err_msg,wind_turbine_powercurve_hub_efficiency] =
f(wind.turbine.radio_list_or_design,wind_turbine_powercurve_windspeeds_from_lib,wind_turbine_powercurve_powerout_from_lib,wind_turbine_kw_rating_from_lib,wind_turbine_kw_rating_input,
wind_turbine_rotor_diameter_input,wind_turbine_hub_ht,wind.turbine.elevation,wind_resource_model_choice,wind_turbine_max_cp,wind.turbine.max_tip_speed,wind.turbine.max_tspeed_ratio,
wind_turbine_cutin,wind_turbine_cut_out,wind.turbine.drive_train)
I could not find any restrictions for this in the SAM documentation. For a rotor diameter of 154m, a maximum rotor speed of 11rpm and a nominal wind speed of 13m/s, a "Maximum tip speed" of 88.7 m/s and a "Maximum tip speed ratio" of 6.8 should be reasonable.
If you could help me with this problem that would be great.
Thank you and best regards
Marc
