大型风力机齿轮传动系统机电耦合动态特性研究

针对目前风力机柔性齿轮箱动力学研究时简化电气系统的问题,以某8 MW永磁同步风力机为对象,建立包含详细电气系统和柔性传动链的风力机模型。基于该模型探究电气系统效应对风力机齿轮箱啮合刚度、动态接触应力、振动加速度等动力学特性影响。结果表明：电气系统效应使系统转速、时变啮合刚度、接触应力相位滞后且波动减小;电气系统效应抑制各级齿轮角加速度及箱体振动加速度高频成分并减小传动链振动;风速突变时,电气系统效应可减小高速级齿轮峰值啮合力,增强风力机传动链抵御冲击能力。

STUDY ON ELECTROMECHANICAL COUPLING DYNAMIC CHARACTERISTICS OF LARGE WIND TURBINE GEAR TRANSMISSION SYSTEM

Aiming at the problem of simplifying the electrical system in the dynamic research of flexible gearbox of wind turbine, a wind turbine model with detailed electrical system and flexible transmission chain is established by taking an 8 MW permanent magnet synchronous wind turbine as the research object. Based on the model, the influence of electrical system on the dynamic characteristics of wind turbine gearbox, such as mesh stiffness, dynamic contact stress and vibration acceleration is explored. The results show that, the transmission chain will be affected by the electromagnetic damping of the generator which will slow down the response speed, but the meshing stiffness and contact stress fluctuation of each gear will be reduced. The high frequency component of angular acceleration and x-direction vibration acceleration of the gearbox are suppressed, so the vibration amplitude of the transmission chain is declined. When the wind speed change suddenly, the peak meshing force of high-speed gear decreases with the electrical system, which improves the wind turbines' ability of remaining stable.