摘要
随着风力发电技术的不断发展,大功率、长叶片已逐渐成为大型风力发电机组的主要特征和发展方向,以持续提升风能利用的经济性。风力发电机组大型化带来叶片长度和重量的显著增加,风轮每旋转一周,在低速轴上的受力和作用在叶片上的重力均会出现周期性变化,同时,在风轮旋转平面上,因风切变、塔影效应和湍流的作用而产生循环变化的载荷。风力发电机组大型化必然带来机组疲劳载荷的增加,疲劳载荷是风力发电机组在全风速范围内运行所产生的典型载荷循环,循环的数量正比于各种风速下机组发电运行的时间,决定着部件的设计使用寿命。为进一步研究风切变、塔影效应、叶片重力、叶片推力载荷对大风轮直径机组叶根疲劳载荷所产生的影响,文章通过对风轮运行载荷分析和系统仿真,对变桨传动系统结构有限元计算和分析,研讨影响变桨传动系统可靠运行的主要因素,为大型风力发电机组变桨传动系统可靠性设计提供参考。
With the continuous development of wind power generation technology,high power and long blades have gradually become the main features and development directions of large scale wind turbines,so as to continuously improve the economic efficiency of wind energy utilization.Large scale wind turbine has significantly increased the length and weight of the blade,the wind wheel rotates a circle,and force at low speed shaft gravity on the blades will appear periodically,in addition,on the wind wheel rotating plane,the load cycle changes due to wind shear and the effect of tower shadow and turbulence.Large scale wind turbine will increase fatigue load,fatigue load is a typical load cycle of wind turbine operation in the wind speed range.The number of cycles is proportional to the time of the unit operation under various wind speeds,and which determines the design service life of parts.In order to further study the effect of wind shear and tower shadow,gravity,blade thrust generated on the root fatigue load of large-scale wind turbines.by the wind turbines running load analysis and system simulation,the finite element structure of the variable pitch system is analyzed and calculat?ed to research on the main factors which effects the reliable operation of the variable pitch system,and provide reference for reliability design of variable pitch system of large scale wind turbine.
作者
毛忠兴
邓良
杨静
Mao Zhongxing;Deng Liang;Yang Jing(Dongfang Electric Wind Power Co.,Ltd.,Deyang Sichuan,618000)
出处
《东方汽轮机》
2018年第1期66-72,共7页
Dongfang Turbine
关键词
大型风力发电机组
叶根载荷分析
结构可靠性设计
变桨传动系统
large scale wind turbine
blade root load analysis
structural reliability design
variable pitch system
