Research On Micro-siting And Design Of Collection System In Wind Farm Considering Flow Around Towers

With the development of human society,the demand for energy is increasing.Due to the excessive consumption of fossil energy and the deterioration of the environment,the proportion of clean energy in energy is gradually increasing.Wind energy is favored in renewable energy because of its abundant reserves and excellent commercial prospects.At present,the research on wind power generation is more mature.With the increase of wind power permeability,the impact of wind power Grid-connected on power system is gradually increasing,so it is urgent to improve the reliability and economy of wind power generation.In this paper,the effect of tower circumfluence,the micro-location scheme of wind turbines and towers are studied in depth.At the same time,the collector circuit design of wind farms is studied,and the tower circumfluence model of wind turbines is established.The wake effect,mountain topography and random wind direction in wind farms are considered comprehensively.The micro-siting scheme of wind farms is analyzed and compared with the actual wind farms.The method of cost accounting is used to evaluate the scheme of collector line.The main research is as follows:(1)The basic principle of wind power generation and wind turbine are studied.A Weibull wind speed probability model of wind farm is built according to randomness and intermittentity of wind speed.The Weibull parameters c and k are solved by the statistical value of measured wind speed.The Weibull parameters calculated by the average wind speed and standard deviation method can simulate wind farm more accurately.The conclusion of wind speed characteristics.(2)A Bell model with two peaks is established beacuse of the complexity of mountain terrain.The influence of the above factors on the micro-location of wind farms is analyzed under the consideration of wake effect and random wind direction,and the actual output power of a wind farm in Shanxi Province is compared with the micro-location simulation results in this paper.The results show that the micro-location method in this paper can get better wind energy utilization rate compared with the actual wind farm.(3)A downstream wind turbine experiences a decrease in power output due to wind speed weakening caused by the shelter of tower.In order to calculate the effect on WTG’s output power quantitatively caused by the shelter of tower,a wind speed variation model of tower is proposed.The presented model are used to studying the effect of the flow around the tower on WTG’s output power,which takes into account the wake effect,mountain terrain and random wind direction.The output power of wind turbine are calculated using simulation method with considering the flow around the tower effect.Results show that the influence of flow around the tower on WTG cannot be ignored in some specific conditions.(4)A design model of topology of collection system is established based on the wind speed model of tower,which combines the micro-siting of tower and cable line in wind farm.The micro-siting of tower is optimized by coordinate pattern search method,and the cable routing is optimized by k-clustering algorithm and minimum spanning tree method.The micro-siting of tower and the topology of collection system optimization are analyzed based on the actual monitoring data of a wind farm in Shanxi.