This recommended practice (RP) provides recommendations for the use of turbulence intensity (TI) measured by ground-based vertical profiling lidars (GBL) in wind energy applications. The RP’s main purpose is to define acceptance criteria (AC) that provide clear limits when GBL TI is used as an alternative to a co-located cup or sonic anemometer TI. The AC employ error metrics to represent the deviation between lidar and met mast (cup or sonic anemometry) TI in a meaningful way.
Applicable standards are currently based on the use of TI measurements from cup or sonic anemometry. This impedes the application of lidar-measured TI. This RP provides a method for accepting TI measurements from GBL when validated against a co-located met mast.
This recommended practice supplements DNV-ST-0437.
The objectives of this RP are to:
- provide a method for using GBL TI measurements in combination with co-located met mast data
- serve as a supporting document when considering the use of GBL TI measurements for the application of wind resource and wind turbine (WT) certification in combination with other applicable standards, recommended practices, and guidelines.