摘要
为了提高低风速条件下风力发电机组的经济效益,提出了一种通过合理设计叶片来降低机组度电成本的方法。以相同功率等级、不同叶片长度的3种风力发电机组作为研究对象,在不同风力条件下分别计算各机组的年发电量,利用经验公式对各机组的总成本进行估计。结果表明:机组的度电成本随着平均风速的升高而降低。在平均风速较高的地区,长叶片机组在度电成本上的优势并不明显。而在平均风速较低的地区,机组的年发电量随着叶片的加长而明显增加;尽管总成本有所升高,但度电成本依然得以降低。通过适当减小叶片的最佳叶尖速比、增大风能利用系数也可以降低度电成本。该文还论述了通过合理选择叶片长度、优化翼型以及应用新材料来提高机组经济效益的可行性。
The cost of energy（COE） of a wind turbine generation system（WTGS） can be reduced by proper design of the rotor blades to improve the economics for low wind speeds.This study analyzes three systems with the same power rating and different blade lengths.The annual energy production of each system was calculated for different wind conditions,with the total system cost estimated using empirical formulas.The results show that the system COE decreases with the average wind speed and a system with longer blades has no economic superiority in a region with strong winds.However,the annual system energy production is greatly improved by increasing the blade length for low wind speed conditions.The total system cost will increase,but the energy cost will still be reduced.The energy cost can also be reduced by reducing the optimal tip-speed ratio or by increasing the blade power coefficient.The study shows the feasibility of improving the economic benefit of a wind turbine generation system by proper selection of the blade length,optimal design of the airfoil or the application of new materials.
出处
《清华大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2011年第3期356-360,共5页
Journal of Tsinghua University(Science and Technology)
基金
国家"十一五"科技支撑计划(2006BAA01A19)
关键词
风力发电
低风速条件
叶片长度设计
年发电量
度电成本
wind power generation
low wind speed condition
blade length design
annual energy production（AEP）
cost of energy（COE）
