Multi-body Dynamic Modeling Of Drive Train In Wind Turbine

With more government investment in wind energy field, wind turbines have appealed much attention. The key component, drive train, has become the research hot point. The multi-body (MB) dynamic modeling is one of the drive train research approaches, and its big different from other approaches is dynamic performance can be analyzed at the kinematics and dynamics angle with3dimensional animation of the model.This dissertation focuses on two modeling platforms, Virtual.Lab.Motion and S4WT. In Motion, gearbox, drive train and wind turbine are modeled from the basic CAD parts. The gearbox is a MB model with flexible planet carrier based on the modal synthesis method. And the gearbox modeled is simulated with the given speed drive. Moreover, normal momentum theory blade model in Matlab and aerodynamic forces based on blade element momentum (BEM) theory are two methods of wind loads modeling; the speed-torque control curves and Matlab generator model are two methods of generator loads modeling. In the wind turbine simulation, multi-coupling effect is realized through the1D&3D co-simulation. The results indicate that flexible parts would affect drive train output performance and BEM theory is indeed better than normal momentum theory in simulation.In S4WT, gearbox with super element planet carrier and high-fidelity1.5MW wind turbine according to practical parameters are modeled. Under the given input&output torque and the input speed conditions, steady response of gearbox model is simulated. Under the constant wind and the turbulence conditions, normal pitch-conditioned, steady power output and emergency stop of wind turbine are simulated. Furthermore, after the modal analysis simulation, mode vibrations of blades under different resonance frequencies are listed. Finally, different drive train dynamic responses due to drive train configuration are compared.In the end, comparisons of these two MB dynamic software are shown. From the simulation curves, most of the steady results are almost same. Through qualitative analysis, they both have their own advantages and shortcomings.