兆瓦级风力发电机组偏航系统主动偏航特性分析

针对兆瓦级风力机偏航动作时剧烈振动问题,本文根据兆瓦级风机偏航系统主动偏航原理,在ADAMS中建立了兆瓦级风力发电机偏航系统虚拟样机动力学仿真模型.兆瓦级风力发电机组偏航系统主动偏航振动分析结果表明,偏航系统前四阶扭转振动的固有频率分别为17.694 7Hz,55.816 6Hz,85.141 2Hz,170.182 3Hz.动力学仿真分析结果表明,主机架在偏航运动的结束阶段存在剧烈的来回振荡现象,且振动的幅值达到了0.15rad,振动衰减的时间超过了20s,通过在主机架上加反馈控制可快速消除兆瓦级风机偏航系统来回振荡现象.

Characteristic Analysis of the Active Yaw System for the Megawatt-class Wind Turbine

The yaw system of the megawatt-class wind turbine produced severe vibration in the process of work. A virtual prototype model of the yaw system was established in ADAMS based on the active yaw theory of the megawatt-class wind turbine. Vibration analysis results have shown that the first order natural frequency of torsional vibration of the yaw system is 17.6947Hz, the second order natural frequency is 55.8166Hz, the third order natural frequency is 85.1 412 Hz, and the fourth order natural frequency is 170.1823Hz. Dynamic analysis results have shown that the nacelle has to bear severe oscillation at the end of the yaw, the amplitude is as high as 0.15rad, and it will last 20s. The vibration of the yaw system can be reduced by adding a feedback control to the frame of the megawatt-class wind turbine.