大型风电机组滑动式偏航系统制动过程机电耦合特性规律

Electro-mechanical Coupling Characteristics of Braking Process of Sliding Yaw System of Large Wind Turbines

偏航系统是连接风电机组叶轮与塔筒承载部件,其偏航运动受气-机-电-液耦合作用,通过对偏航系统机电特性分析,开展了偏航力矩载荷力学分析计算,基于4种典型的极限工况,对工况发生历程中偏航力矩变化规律进行分析,重点对偏航运行制动及偏航静止制动特性进行研究,研究表明:电机制动速度控制阀值、制动响应时长、尾部制动时长是滑动式偏航系统制动特性主要考虑因素,确定滑动系统配合以变频控制偏航方式,采用失电制动模式为最优选择,制动电机速度可降低至35%。而在偏航静止制动状态下,相比于驱动个数的增加,制动力矩增大对改善偏航滑移最为明显,产生偏航瞬时发生转动角度更小,但输出小齿冲击受载更大。

The yaw system connects the rotor of the wind turbine and the tower for the load bearing component,which the motion is subjected to the coupling effect of gas-machine-electric-hydraulic.According to analyzing the mechanical and electrical characteristics of the yaw system,the mechanical analysis and calculation of the yaw torque load was carried out.Based on four typical extreme operating conditions,the torque variation law of the yaw load was analyzed during the operating process.It focus on the study of the yaw operation braking and yaw static braking characteristics.The results show that the motor braking speed control threshold,braking response time.The tail braking duration is the main consideration factor for the braking characteristics of the sliding yaw system.It is determined that the sliding system is coordinated with a variable frequency control yaw mode,and the optimal choice is the power loss braking mode.The braking motor speed can be reduced to 35%.Compared to the increase in the number of drives,the increase in braking torque has the most significant effect on improving yaw slip in the static braking state of yaw,resulting in a smaller instantaneous rotation angle of yaw,while a greater load on the output small tooth impact.