Investigations Of Wind Energy Characteristics Of Interactions Between Wind Turbines And Typical Complex Topographies

Wind energy is a kind of renewable energy with abundant resources.The main way to utilize wind energy is to convert it into electricity through wind turbines,which is widely used by people.The first development is the offshore wind farm,because the offshore wind resources are abundant and there is enough space for the installation of wind turbines.In addition,for offshore wind farms,the factors that affect the aerodynamic performance of wind turbines mainly come from the interaction between turbines,and the research on wake is relatively simple.However,in addition to the influence between the wind turbine,terrain factors also affect the fatigue load of the turbine and the power generation efficiency of the wind farm In complex terrain.There isn’t enough research to study the hill shape effects on the interactions.And under what conditions the superposition method can be used is an unsolved question.In this paper,Large Eddy Simulation is adopted to study the influence of the boundary conditions of the sliding wall and the turbulent entrance on the wake,and the interaction between wind turbines and typical complex terrain.The effects of the hill shape,the size of the wind turbine,and the location where the wind turbine installed are studied.In addition,the superposition method is used in this paper to obtain the mean x wind speed and turbulence intensity of the wind turbine located in complex terrain.By comparing with the numerical simulation results of LES,the applicable conditions of superposition method are explored and the superposition method of wind defect is determined.Turbulence has a great influence on the wake.Under the condition of uniform inflow,the recovery of wind speed deficit is slow.It is found that the interaction becomes stronger as changing the terrain shape from 3D hill to 2D hill,decreasing the size of the wind turbine,or reducing the distance between the wind turbine and the hill.The superposition of the wind deficit following the streamline from the rotor center in the absence of the wind turbine is evidently better as compared with that following the location with a vertical distance of hub-height to the local ground.In addition,the superposition method is found to be applicable,with errors less than 20%,when the ratio of hub-height to the hill height is larger than 2.5 and the wind turbine is mounted upstream of the windward hill foot.When the wind turbine is located at the top of the terrain or when the ratio of hub-height to the hill height is small,the error of superposition method is larger.