Recently the size and the capacity of wind turbines increase rapidly, the interactions between the wind turbines and the grid becomes more obvious. The disturbances and the faults of the grid will have impact on mechanical components of wind turbines. In order to obtain the dynamic responses of the blade under voltage sag, the blade is modeled as a cantilever, discretely by applying 3D Timoshenko beam element, considering the centrifugal stiffening of the rotating blade. The structural dynamic equation of the blade is established and the time-varying loads acting on the blade are calculated based on the data from a 1.5MW wind turbine LVRT(low voltage ride through) test. The dynamic responses of the blade under the three-phase symmetrical voltage dip and three-phase asymmetry dip are calculated by applying Newmark method. The results show that, the voltage dip produces the transient loads and excites the vibrations of the blade. The amplitude of vibration in the flap wise is bigger than edgewise. The vibration increases with the load of wind turbine and voltage drop of the magnitude . The dynamic responses of the blade under the three-phase symmetrical voltage dip are larger than that under three-phase asymmetry dip.
尹尧杰，廖明夫，吕品，刘展翅. 电压跌落对风力机叶片振动影响分析[J]. 振动与冲击, 2016, 35(10): 192-201.
Yin Yaojie，Liao Mingfu，Lyu Pin，Liu Zhanchi. Investigation of Voltage Sag Impact on Wind Turbine Blade Vibrations. JOURNAL OF VIBRATION AND SHOCK, 2016, 35(10): 192-201.
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