风电偏航制动器制动稳定性研究

Research on Braking Stability of Yaw Brakes in Wind Turbine Generator

针对研发新型抗颤振风电偏航制动器而避免偏航过程中的失稳振动问题,从摩擦学的角度研究偏航系统失稳振动机理,通过建立偏航制动系统动力学模型来研究风电偏航制动稳定性问题。结果表明,偏航失稳振动与系统的刚度、固有频率和阻尼比、制动盘与制动块上的摩擦片材料、制动盘质量、活塞直径与数量以及偏航余压等参数有关;当偏航过程中发生失稳振动时,可通过减小偏航余压或更换摩擦因数更小的摩擦片来控制振动;研发抗颤振风电偏航制动器时,应基于制动盘并结合稳定性曲面图进行偏航制动器结构设计和材料选择。

To develop a new anti-chatter yaw brakes in wind turbine generator for avoiding the problem of unstable vibration in the yaw process of the wind power, the mechanism of unstable vibration in the yaw system is studied from the theory of tribology. The dynamics model for the yaw brake system is established to study the brake stability problem in the yaw process. The results indicate that the yaw unstable vibration is related to the system stiffness,natural frequency and damping ratio, the materials of the brake disc and the friction plate on the brake slipper, the brake disc mass, the piston diameter and its amount, and the yaw residual pressure. The vibration can be controlled by reducing the residual pressure or the friction plate with lower friction coefficient when the unstable vibration occurs in the yaw process. In the process of yaw brake design and material selection, the brake disc and the stability surface diagram should be taken into account.