基于FAST的风电机组塔架耦合振动研究

RESEARCH ON COUPLING VIBRATION OF WIND TURBINE TOWER BASED ON FAST

为研究大型风电机组的振动机理,基于贝兹理论选取用于低风速区2 MW风电机组的叶片,基于PID控制系统标定相关参数。采用FAST软件建立塔架、叶片、轮毂和机舱一体化模型,对该2 MW风电机组正常运行工况和紧急停机工况下的动力响应进行分析。分析结果表明,该风电机组一阶频率较低,塔架前后方向为主要振动方向;正常运行工况下,风电机组塔架前后方向加速度响应受3P、6P影响较大(1P为风轮额定转动频率),二阶振型影响明显;紧急停机工况会加剧塔架的振动,塔架前后方向加速度响应主要受塔架一阶振型影响,塔架二阶振型对塔架侧向加速度响应影响明显;该结果为后续振动控制研究奠定基础。

In order to research the vibration mechanism of large-scale wind turbines,the parameters of blades for 2 MW wind turbine applied in the low wind speed areas are selected based on the Betz theory and calibrated based on PID control system.The integrated model including the tower,blades,hub and nacelle is established using FAST software.The dynamic responses of this 2 MW wind turbine under normal operating load case and emergency shut-down load case are analyzed.The numerical results show that the first-order frequency of the wind turbine system is relatively lower and the vibration mainly occurs in the F-A direction.Under the normal operating load cases,the acceleration response of the wind turbine tower in the F-A direction is greatly affected by 3P and 6P excitations(P is the rated rotational frequency of the rotor)and the influence of the second-order vibration mode is obvious.The vibration of the wind turbine will be aggravated under the emergency shut down case.The acceleration response of the tower in the F-A direction is mainly affected by the first-order vibration mode,but the second-order vibration mode has a significant effect on the acceleration response in the S-S direction.The conclusions can provide a research basis for the vibration control of the full steel tower.