Features

WAT is a post-processor of calculations by WAsP and WAsP Engineering and the main purpose is to facilitate IEC site assessment. In addition WAT predicts annual energy production with uncertainty and including effects of sector management and other technical losses. WAT also facilitates the terrain and obstacle assessments needed for IEC standards on power-performance measurements.

IEC 61400-1 site assessment

Extreme wind speed
Wind shear
Flow inclination
Wind speed distribution
Effective turbulence intensity including effects of sector management
Extreme ambient turbulence intensity
Terrain assess and Cct turbulence structure correction factors

Annual Energy Production

Air-density correction of power curves
Wake effects
Wind sector management
Turbine availability
Internal transmission loss
Grid curtailment
Uncertainty and conservative P90 and P75 AEP estimates

IEC 61400-12-1 for in-situ power-curve measurements

Obstacle assessments
Terrain assessment

IEC 61400-12-2 for power-curve by nacelle anemometry

Obstacle sub-division
Effect of wind-direction fluctuations on usable measurement sector
RIX–numbers for terrain assessment