摘要
针对高原型变速变桨风力发电机组在额定风速附近容易失速,在额定风速以上载荷较大的问题,提出在额定风速以下根据叶片气动特性进行变桨微动控制,通过变桨动作,调整叶片攻角使其远离失速点;在额定风速以上时提出桨距角纹波技术,通过在传统桨距角给定信号上叠加纹波信号间接加大塔架一阶振动模态的阻尼,避免塔架顶部的大幅度振动位移。通过Bladed软件对提出的变桨控制方式进行仿真分析,结果表明:相对传统的变桨控制方式,提出的额定风速以下变桨微动控制能有效地避免风电机组失速;提出的桨距角纹波技术能增加塔架一阶振动模态的阻尼,有效地减小风电机组在额定风速以上发电时塔架顶部的振动位移,降低塔架的疲劳载荷。
For plateau type VSVP （variable speed variable pitch） wind turbine which is very easy to stall around rated speed and often generate large loads above rated speed, a micro-motion pitch control scheme around rated speed is proposed to modify the at-tack angle of airfoil according to its aerodynamic characteristics, so that the attack angle of airfoil can be far away from stall zone. A pitch ripple control scheme adopted here can increase the tower damper indirectly by adding a ripple signal to the original pitch an-gle, which can avoid large loads and decrease tower top vibration displacement above rated speed. Comparing Bladed simulation re-sults of the pitch control scheme here with the traditional pitch control＇s, the way of pitch control presented here can avoid stall in low air density zone around rated speed, and can also reduce the load of some crucial parts of the turbine above rated speed.
出处
《东方汽轮机》
2015年第3期33-40,共8页
Dongfang Turbine
基金
四川省科技支撑计划项目资助项目(2014GZ0084)
关键词
高原型
变速变桨
变桨控制
失速
机组疲劳载荷
plateau type
variable speed variable pitch
pitch control
stall
turbine fatigue load
