Effect of Forced Excitation on Wind Turbine with Dynamic Analysis in Deep Offshore Wind in Addition to Japanese Status of Offshore Projects
Effect of Forced Excitation on Wind Turbine with Dynamic Analysis in Deep Offshore Wind in Addition to Japanese Status of Offshore Projects
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DOI：
10.1016/j.egypro.2012.06.081
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发表时间：
2012
期刊：
影响因子：
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通讯作者：
M. Iino;T. Chujo;M. Iida;C. Arakawa
中科院分区：
文献类型：
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作者：
M. Iino;T. Chujo;M. Iida;C. Arakawa
在本文中，我们试图评估控制方法对浮式海上风力机的影响。水池实验表明，传统的桨距控制可以放大浮式风力机的平台桨距振荡。为了了解这种物理现象，我们使用了GH叶片的气动弹性模拟。涡轮机模型是根据风洞试验中使用的涡轮机建立的。为了模拟浮式平台的俯仰运动，我们采用了风力机模型，模拟了风力机前后俯仰运动的相对风速变化。采用了两种控制方法：代表大型风力机额定前状态的定桨距变速控制和代表大型风力机超额定状态的变桨距变速控制。比较了两种控制方法的风速变化与转子推力变化的关系，发现传统的桨距控制方法使推力变化几乎与风速的增减成反比。从推力反转到风速变化，可以放大塔台俯仰运动。也就是说，桨距控制会对塔台俯仰运动产生负阻尼力。综上所述，虽然桨距控制的目的是减少叶片负荷，但桨距控制会增加较大的叶片负荷。
In this paper, we tried to estimate the effect of control method on floating offshore wind turbine. The experiment in the water basin revealed that traditional blade pitch control can amplify the platform pitch oscillation of floating wind turbine. In order to understand the physical phenomenon, we used aeroelastic simulation using GH Bladed. Turbine model is based on the turbine used in wind tunnel test. To simulate the pitching motion of floating platform, we used onshore wind turbine model with inflow with oscillating wind speed that simulates relative wind speed change from wind turbine's fore-aft pitching motion. Two types of control method are used; fixed pitch variable speed control which represents before rated state of large wind turbines and variable pitch variable speed control which represents over rated state of large wind turbines. Comparing the relation between wind speed change and rotor thrust force change of two control methods, we made it clear that traditional blade pitch control method make thrust force change almost the inverse of wind speed increase and decrease. From thrust force inverse to wind speed change, tower pitching motion can be amplified. That is, blade pitch control can induce negative damping on tower pitching motion. As a conclusion pitch control can increase larger blade load although pitch control aims to reduce the blade load.