大规模风电场建成后对风能资源影响的研究  

Preliminary Estimates of Wind Energy Resources Deficit in Large Wind Farm

作　　者：刘磊[1,2] 高晓清[1] 陈伯龙[1,3] 汪宁渤[4] 

机构地区：[1]中国科学院寒区旱区环境与工程研究所寒旱区陆面过程和气候变化重点实验室,甘肃兰州730000 [2]中国科学院研究生院,北京100049 [3]兰州大学大气科学学院,甘肃兰州730000 [4]甘肃省电力公司风电技术中心,甘肃兰州730070

出　　处：《高原气象》2012年第4期1139-1144,共6页Plateau Meteorology

基　　金：中国科学院"西部之光"联合学者项目(0928691001);中国科学院寒区旱区环境与工程研究所创新项目(0880A81001)共同资助

摘　　要：考虑了千万千瓦级风电基地建成后风电机群对近地面层风速的影响,采用Frandsen研究了大规模风电场内部风速损失时所使用的方法,在内边界层已经充分发展成新边界层的区域内,对轮毂高度65m处风速Uh进行了计算。结果表明,风电场建成后研究区内,风速Uh与未建场时的65m风速U0相比变小,存在风速损失,该风速损失随着U0的增大而减小,与风电机的推力系数CT性质有关;大规模风电场建成后,Uh在3～20m.s-1范围内的平均风功率密度与未建场时U0在此范围内的平均风功率密度相比损失约为58.45%,这与建场地区建场前65m处风速值大小以及各风速值出现的概率有关。The assessment of wind energy resource plays a fundamental role in its exploitation. The assess- ment should take into account the influence of wind turbines on the current within the wind farm in the surface lay- er. An area of approximately 2 000 km2 with a roughness length of 0.03 m in large wind farm is idealized. 6 667 typical wind turbines about one million kilowatts are distributed uniformly over the area. The Frandsen method is used to analyze the influence of wind farm on the wind energy resources within the area where the internal bound- ary layer has filled the whole boundary layer in the wind farm. The results show that the wind speed at the height of 65 m will decrease when the situation with the presence of the wind farms is taken. This reduction becomes less when the wind speed at the height of 65 m increases, due to the property of drag coefficient in wind turbine. With- in the wind speed range of 3-20 m.s 1 at the height of 65 m, the average wind power density considering the situation without and with wind farms are calculated, respectively. And the value decreases 58.45% when the wind farm is installed.

关 键 词：风电场 地表粗糙度 对数风廓线 推力系数 

分 类 号：P425.6[天文地球—大气科学及气象学]