摘要
分析叶片变桨速率对于风电机组机械载荷影响的机理,并基于某2.5 MW双馈型风电机组载荷实测数据,对相同外部条件不同叶片变桨速率停机过程的载荷数据进行分析,研究叶片变桨速率对风电机组疲劳与极限载荷的影响。运用GH Bladed软件,对不同叶片变桨速率停机工况下的风电机组载荷进行仿真计算,验证叶片变桨速率与风电机组载荷之间的内在关系。现场测试数据与仿真结果均表明,风电机组停机过程中的载荷特性与叶片变桨速率相关,且随着叶片变桨速率的增加,疲劳与极限载荷随之明显增加。由叶片变桨速率增大导致的风电机组极限载荷增加比例与疲劳等效载荷增加比例相近。
The effect mechanism of blade pitch rate on the mechanical load of wind turbine was analyzed. Based on theactual load data of a 2.5 MW doubly-fed wind turbine,the load data of different blade pitch rate in shutdown processunder the same external condition were analyzed to study the influence of blade pitch rate on the fatigue and ultimate loadof the wind turbine. The GH Bladed software was used to simulate the mechanical load of wind turbine under differentblade pitch rate for shutdown process and verify the intrinsic relationship between blade pitch rate and load of windturbine. Both field testing data and simulation results show that the load characteristics of wind turbine in shutdownprocess is related to blade pitch rate,and the fatigue and ultimate load obviously increase with the increase of blade pitchrate. The increase ratio of the ultimate load of the wind turbine caused by the increase of blade pitch rate is similar to theincrease ratio of the fatigue equivalent load.
引文
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