风力发电机组气动不平衡振动监测研究

Vibration monitoring on aerodynamic asymmetry of wind turbine

针对大型风电机组气动不平衡故障的安全监测问题,对风电机组在气动不平衡故障时表现出的振动特性进行了理论研究,对风电机组在气动平衡和不平衡时机舱不同位置的轴向和横向振动进行了测试。根据测试结果提出了一种基于风轮1P转频振动的在线监测与保护系统,实时监测风轮1P转频振动有效值幅值,采用时间累积的延时报警策略以防止误报。研究结果表明:气动不平衡故障时风轮1P转频振动幅值明显增大,且轴向的振动变化相比横向振动更加明显;所提出的在线监测系统故障断路响应迅速、可靠性高,对保障风电机组稳定安全运行,促进叶片监测诊断技术发展具有重要意义。

Aiming at the problem of on-line monitoring of aerodynamic asymmetry fault,the vibration characteristics of the wind turbine under such fault were analyzed. Both the axial and lateral vibration at different positions in the nacelle with and without aerodynamic asymmetry fault were mearsured. A rotor aerodynamic asymmetry on-line monitoring and protection strategy was further proposed based on the 1-P vibration of the wind turbine. The effective value and amplitude of the 1-P vibration can be monitored by this system in real time and a delayed alarm strategy was utilized to avoid false alarm. The results indicate that the 1-P vibration significantly increases under rotor aerodynamic asymmetry fault,and the axial vibration changes compared to the lateral vibration are more obvious. Furthermore,the on-line monitoring system has fast response speed and high reliability,which is of great significance to the safe operation of the wind turbine and development of blade damage diagnosis technology.