Turbine Types

This task allows you to define the turbine types required to model your wind farm. To configure a turbine type start with the following tools:

	Collapse tree	Collapses the turbine type tree
	Expand tree	Expands the turbine type tree
	Add new turbine type	Create a new turbine type specification from scratch. You will see red validation errors where you must enter data
	Import turbine type	Imports turbine type(s) from selected .trbx (xml) or WAsP .wtg files
	Import turbine type From Library	WindFarmer: analyst allows you to reference a file system folder of trbx files which you can then use from any project
	Copy turbine type	Copies a selected turbine type in the workbook to a new specification in the workbook. This can be very useful if you want to change a few parameters
	Export turbine type	Exports the selected turbine type specification to a .trbx file. TRBX files are .xml files
	Delete turbine type	Deletes the selected turbine type specification from workbook

Start stop strategy and hysteresis modelling

To model high wind speed hysteresis in later energy calculations, the adjusted turbine high speed cut-out properties are used. A common assumption is to set the adjusted cut out be half way between the high wind speed cut-in and high wind speed cut-out wind speeds provided by the manufacturer.

Data used in calculations

Data	Effected calculations	Guidance
Selected height	Wake, flow, hub height time series and shadow flicker	This is the turbine hub height used in many calculations
Rotor diameter	Wake, layout optimisation and shadow flicker	Used as the length-scale in wake calculations and turbine separation constraints for design and optimisation
Rated Power	Energy (reporting)	Used for determining capacity factors
Air density	Power curve air density correction	Power curves are provided for a specific air density. WindFarmer will extrapolate the power curve to turbine location specific air densities from this value
Start stop strategy	Wake and power calculations	These settings define when the turbine is operational. When above high speed cut-out or below low speed cut-in the wind turbine is not operational so is not producing power or wakes.
Performance table - Power	Energy	This defines the power output of the turbine at the corresponding wind speed and air density for the performance table
Performance table - Thrust coefficient	Wake and design turbulence	The thrust coefficient impacts the initial wake wind speed deficit and added turbulence intensity.
Performance table - Rotor speed	Eddy viscosity wakes	The rotor speed has an effect on the near wake length if you use the eddy viscosity wake model. The near wake length has an effect on the added turbulence intensity in the wake as modelled with the Quarton/Ainslie equation.
Power control type	Power curve air density correction	Either Pitch or Stall, this effects how the IEC air density correction is done
Anemometer matching factor	Energy	If this is not set to 1, turbine incident wind speeds will be multiplied by this value prior to lookup of power values from the performance table
Turbine 3D parameters	Shadow flicker	If in the shadow flicker calculation settings you consider the offset between tower and rotor this information is taken from the 3D properties