Investigations On Analytical Wake Model Of Wind Turbine And Multi-strategy Optimal Arrangement Of Wind Farm

As a non-renewable energy source,fossil fuels will eventually be exhausted in the foreseeable future,and among various renewable energy sources,wind energy is one of the most promising alternative energy sources.At present,the use of wind energy is mainly to convert wind energy into electrical energy through wind turbines.After the incoming flow passes through the plane of the wind wheel,part of the energy is absorbed,so that the wind speed decreases and the wind direction changes,which is called wake effect.As a result of complex nonlinear phenomena,wake effect is difficult to be accurately predicted,but it seriously affects the power generation efficiency of wind farms.Therefore,it is of great significance to carry out research on the wind turbine wake analysis model and the optimal arrangement of wind farms to improve the efficiency of wind farms.In addition,compared with onshore wind farms,offshore wind farms have many advantages,such as higher energy efficiency of wind energy resources,higher average air density,more concentrated wind direction,less turbulence intensity and wind shear changes.However,the total cost of offshore wind farm development and survey,equipment manufacturing,installation,construction,and operation and maintenance is relatively high,and the cost of offshore wind farms is also higher than that of onshore wind farms.Therefore,it is also important to optimize the arrangement of offshore wind farms.In this paper,the analytical wake models are summarized firstly,and the Gaussian wake model is modified into a double Gaussian wake model,which improves the calculation accuracy when the wind turbine spacing is small.Then,based on this wake model and genetic algorithm,the research on the multi-strategy optimization arrangement of onshore wind farms,the distance between wind turbines and the optimal yaw angle was carried out.Finally,for the offshore wind farm,the optimal arrangement of offshore wind farm is explored by considering its real engineering cost model.The research results show that the Gaussian wake model has higher accuracy than the Jensen wake model.For onshore wind farms,location optimization has the best effect in increasing the total output power and reducing the cost of electricity,followed by hub height optimization and yaw optimization,and optimizing the position of the wind turbine is not sensitive to additional optimization strategy(such as hub height changes and yaw control).The optimized results show that the optimal layout of wind turbines is staggered under single wind direction,while the optimal layout is regular under multiple wind directions,and the optimal yaw angle of the wind turbines is-10°～10°.For offshore wind farms,the optimized wind turbine layout for flat seabed terrain cannot be applied to complex seabed terrain.