摘要
考虑到处于变速运行阶段的风力机,其叶素的运行攻角并不能保持在单一的设计攻角,翼型多攻角设计逐渐成为复杂风况下提高风能捕获效率的重要手段。该设计方法的关键在于目标函数中多个攻角点及相应权重系数的合理确定。但是,由于缺少对运行攻角分布规律和影响因素的分析,目前目标函数的确定仍依赖工程经验。为此,该文从闭环系统(含风况、风力机和控制器)的视角,基于对最大功率点跟踪控制的动态分析,给出了变速阶段的叶素运行攻角分散分布的机理解释和影响攻角分布的多种因素。并通过Bladed的气动–弹性–伺服仿真,分析了这些因素对运行攻角分布的影响机理和作用规律。将为翼型多攻角设计中优化模型的合理构建提供依据。
Considering the operational angle of attack(AOA) of blade element cannot be maintained at the designed one during variable-speed operation of wind turbines, multi-AOA based airfoil design is gradually becoming a significant approach, which is able to improve the efficiency of wind energy capture under complex wind conditions. The key issue of this design methodology is the reasonable determination of multiple AOAs and corresponding weighting factors in the objective function. However, because there is a lack of the investigation on distribution of operational AOA and influencing factors, the determination of the objective function still relies on engineering experience. Therefore, based on the dynamic analysis of maximum power point tracking control, the mechanism of the decentralized distribution of operational AOA under variable speed operation and various factors that can affect the distribution were presented from the perspective of closed-loop system(including wind condition, wind turbine and controller). Moreover, based on the aero-elastic-servo simulation conducted by Bladed software, the impacts of these factors on the distribution of operational AOA and their mechanism were investigated. The work of this paper will contribute to the reasonable optimization model in the multi-AOA based airfoil design.
出处
《中国电机工程学报》
EI
CSCD
北大核心
2015年第S1期162-169,共8页
Proceedings of the CSEE
基金
国家自然科学基金项目(61203129
61174038
61473151)
江苏省博士后科研资助计划(1301014A)
中央高校基本科研业务费专项资金资助(30915011104
30920140112005)~~
关键词
风力机
叶素
运行攻角
闭环系统
影响因素
wind turbine
blade element
operational angle of attack
closed-loop system
influencing factors
