电压跌落对风力机塔架振动影响分析
Analysis of Voltage Drop Impact on Wind Turbine Tower Vibrations

为分析电网电压跌落对风力机塔架振动的影响,利用二节点梁对风力机塔架进行离散化建模,分析了塔架振动的模态。建立了塔架动力学运动方程,考虑风切变,分析了塔架所受的载荷。基于某风场某型1.5MW风机低电压穿越测试的数据,计算了塔架所受的载荷,并利用模态综合法求解塔架动力学方程,得到对称与不对称电压跌落风力机塔架的瞬态响应。结果表明,电压跌落会对塔架产生冲击效应,冲击的大小与机组工况,电压跌落形式,跌落幅值以及跌落时间相关。
In order to analyze the impact of the voltage drop on vibration of wind turbine tower, the dynamic model of tower is built by the two-node beam elements; the natural dynamic characteristics of the tower are analyzed. We establish the structural dynamic equation considering the wind shear and the loads acting on the tower. Based on the data from a 1.5MW wind turbine low voltage test, the loads of the tower are calculated, and the dynamic equation is solved by the modal superposition method, the dynamic responses under the symmetry and the asymmetry voltage drops are obtained. The results show that voltage drop has impact on tower vibration, the amplitude of vibration depends on the loads of the turbine, voltage drop type, drop amplitude and drop time