风力发电机组传动系统扭振特性分析

TORSIONAL VIBRATION CHARACTERISTICS ANALYSIS OF WIND TURBINE DRIVE TRAIN

根据风力发电机组三质量传动系统动力学模型,建立传动系统状态空间模型,运用现代控制理论方法对传动系统在外界扰动下的扭振特性进行详细分析,并揭示自由振荡频率与传动系统参数的内在关系。在此基础上运用Matlab/Simulink下对传动系统建模,并在时域下与控制理论的分析结论进行仿真对比,验证理论分析的正确性。通过对自由振荡频率的对比分析,论证采用风力发电机组传动系统三质量模型的必要性,并为风电机组传动系统的抗共振设计提供科学依据。

In grid-connected wind generation system,vibration and damages are frequent on drive shaft when the wind field or grid is disturbed due to the flexibility of the transmission system. In view of that,state space model of the transmission system is established based on the dynamic model of the three mass transmission system. Using modern control theory,the intrinsic relationship between the free oscillation frequency and the transmission parameters is revealed,by analyzing the torsional vibration characteristics under external disturbances. On this basis,the Matlab/Simulink model of the transmission system is built,comparing the simulation results and the analysis conclusions of the control theory in the time domain,the correctness of the theoretical analysis is verified. Then,the analysis of free oscillation frequency testifies the necessity of adopting the three mass model in wind turbine transmission system and also provides scientific basis for anti-resonance design of wind turbine transmission system.