A comparison of obstacle and surface roughness models in predicting the performance of an 850 kW wind autoproducer with onsite LiDAR measurements in a peri-urban area

This research case study assesses the impacts of peri-urban features such as buildings on the performance of an operating 850 kW Vestas V52 wind turbine that has a 60 m hub height and 52 m rotor diameter located at the outskirts of Dundalk town in Ireland. Multi-annual 10-minute SCADA data is analysed to assess the directional electrical energy rose (EER) of the wind turbine. This is compared to predictions from WAsP-IBZ that uses an obstacle model to assess buildings and to WAsP-CFD treating buildings as surface roughness elements in the terrain. Onsite LiDAR measurements are used to initialise the WAsP programme in both cases. Measured directional wind shear profiles are also assessed to give further insights into discrepancies between the predicted and actual energy performance of the wind turbine.