分段连接对风电叶片与机组性能的影响

EFFECTS OF SEGMENT CONNECTION ON BLADE AND WIND TURBINE PERFORMANCE

以38 m商业叶片为基础设计一款分段式叶片,采用开源软件和风能专业软件建立风电机组的仿真模型来研究分段连接对风电叶片和机组总体性能的影响。依据国际标准与工程技术规范分析叶片截面刚度、质量、挠度和自振频率,以及机组的载荷与年发电量。结果表明:叶片分段后,第1、第2阶挥舞频率变化幅度均小于6%,摆振频率增幅均小于2%;叶根摆振和挥舞极限弯矩分别增加约10%和3%,摆振和挥舞疲劳弯矩分别增加了23.2%和6.0%;风电机组的最大功率系数与年发电量均无明显变化。

A segmented wind turbine blade was designed based on a 38-meter commercial blade,and a simulation model of wind turbine was built using the open-source and professional software to study the effects of segment connection on the overall performance of the rotor blade and wind turbine.The cross-section stiffness,mass,deflection,and natural frequencies of the rotor blade,and loads and annual energy production(AEP)of the wind turbine were investigated according to the international standards and engineering technical specifications.The results showed that,after dividing the blade,the first two flap-wise and edge-wise natural frequencies changed within 6%and increased by 2%,respectively;the edge-wise and flap-wise extremely bending moments at root section increased by approximately 10%and 3%,respectively,the edge-wise and flap-wise fatigue bending moments at root section increased by 23.2%and 6.0%,respectively;the power coefficient and AEP did not change obviously.