Prediction of the atmospheric boundary layer in wind power plants by proper selection of the main air parameters

Abstract

Romania, based on UE reports has a high wind potential, representing more than 14,000 MW. The main scope of the paper is to estimate the distribution of the horizontal component of wind velocity in the vertical direction and its influence on wind turbines efficiency. The selected domain for analysis is located in the Southeast part of Romania until an altitude of 600 m. Firstly is presented the impact of the boundary layer’s separation in the vertical wind distribution. The database of the main measured parameters is realized with two masts of 80 m high, situated at 20 km distance each other, during for 24 months. Firstly are presented theoretical aspects allowing estimation of the vertical Boundary Layer separation influence on the wind distribution. An altimetry model for the selected area, based on approximations of the soil roughness is calibrated. There are established the necessary corrections for average and variable roughness. Secondary parameters as the air density, pressure, and temperature, also have an essential role in the proper functioning of the wind turbines. The numerical results allow establishing a long-term prediction of the vertical air distribution. The paper ends with conclusions and references.