风剪切下风力机组俯仰控制策略研究
RESEARCH OF TILT CONTROL STRATEGY FOR WIND TURBINES UNDER WIND SHEAR
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摘要: 为增加风电场总输出功率,采用大涡模拟(LES)方法,利用致动线法(ALM),基于开源CFD软件OpenFOAM对风剪切下的风力机组4种风轮俯仰工况进行数值模拟,对比每种工况下的风电场总输出功率,并结合流场参数分析输出功率存在差别的内在原因。结果表明:风电场上游风力机尾迹可对下游风力机性能产生严重影响;风轮俯仰角增加时,风电场上游风力机输出功率先增后减,下游风力机输出功率持续增加;仰角为9°时风电场总输出功率比无俯仰控制策略时提升393982.25 W。Abstract: In order to increase total output power of the wind turbine farm,four tilt control operation conditions under the wind shear were simulated using open-source CFD software Open FOAM based on ALM（Actuator Line Method） and LES（Large eddy simulation）.The total output power of the wind turbine farm for each operation condition was compared and parameters of fluid fields were investigated to find the intrinsic causes to produce the output power difference.The results show that wake of the upstream wind turbine has a serious influence on the wind turbine at the downstream wind farm.When the angle of tilt raises,the output power of upstream wind turbine increases firstly and then decreases,while the output power of downstream wind turbine has continuously increase.Total output power at the tilt of 9° is more 393982.25 W than that of the situation without tilt control strategy.
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