双馈式风电机组传动系统动态特性研究

Research dynamic characteristics of double-fed wind turbine drive system

针对双馈式风电机组柔性传动系统运行稳定性问题,采用集中参数质量法建立风电机组柔性传动模型,在考虑外部风载、齿轮副啮合刚度、啮合阻尼和综合啮合误差激励条件下,建立了齿轮箱内部各级齿轮副动力学方程;以市场成熟的1.5MW双馈式风电机组为计算对象,计算了柔性传动系统固有频率和齿轮箱各级齿轮动态啮合力;通过雨流计数法对齿轮动态啮合力进行数据分析,研究了传动系统运行稳定性。研究结果表明,齿轮副啮合力呈现高频波动,具有很强的时变特性,通过雨流计数分析,动态啮合力幅值与频次成正态分布规律;传动系统一阶扭转振动频率与风轮面内一阶摆阵频率偏差为6.8%,通过降低主轴质量约9.5%,提高了传动系统一阶扭转频率约11.5%,与风轮面内一阶摆阵频率偏差达16.4%。研究结果可为风电机组传动系统设计、轴承寿命计算和可靠性研究提供参考。

Aiming at the operation stability of double-fed wind turbine flexible drive system, wind turbine flexible drive system model was established by using the lumped parameter quality standard. The gearbox dynamics equations were established with consideration of the external wind load, the gear mesh stiffness, mesh damping and meshing error exci- tation. Selected one 1.5 MW double-fed wind turbine as the object of calculation, the natural frequencies of flexible drive system and the dynamic meshing force of gearbox gear meshing were calculated. Statistical analysis of gear dy- namic meshing force was made through the rain flow count method, and the operation stability of drive system was re- searched. The results indicated that the dynamic meshing forces had strong time-varying characteristics, high frequency fluctuations, amplitude and frequency of dynamic meshing force as a normal distribution rule. The deviation between the first order torsion vibration frequency of drive system and the rotor edgewise frequency was 6.8%. Through reduc- ing the weight of main shaft about 9.5 % , the first order torsion vibration frequency values was improved about 11.5 % , and the deviation became 16. 4%. All results could provide references for the double-fed wind turbine drive system de- sign, bearing life calculation and reliability research.