Calculation Of Full-field Wake Velocities For Wind Farm Arrays

In the wind farm,after the wind passes through the wind turbine,its energy is absorbed by the wind turbine,so that the energy is transformed.The axial velocity of the wake after the wind turbine is reduced compared with the incoming velocity,that is,the wake effect is generated.The wake effect affects the power generated by the turbine.Studying the wake effect plays an important role in wind energy utilization,optimization of wind farm layout,saving space resources and improving wind farm efficiency.In view of the calculation of wind farm wake velocity and wind turbine layout problem,we have carried out the following work in this paper:Firstly,based on the semi-empirical engineering wake model,the invisible near-field wake model and the Jensen model are corrected by reasonable assumptions.By using segmentation correction for the near-field region,the radial velocity distribution is more consistent with the actual situation.After that,the modified near-far field wake model is used to establish a wake calculation model that can calculate the range of near and far fields.Then,by combining the modified near-field and far-field wake models,a calculation model for the full field is proposed.In order to facilitate calculation and application,this paper introduces the step function and combines the full-field wake velocity calculation model with the coordinate system to propose a formula for calculating the wake velocity of the whole wind farm.According to the parameters and coordinates of the wind farm and the wind turbine,the wake velocity at any position can be calculated according to the formula,which provides a simple and efficient analysis tool for the design and optimization of the wind farm array.