Research On Dynamics Characteristices Of Large Scale Wind Turbine Drive Train

With the increasing of the world population as well as mechanical-electrical equipment widely used, the electrical energy demand is increasing. Sometimes the voltage is low or unstable in the peak. Then the fundamental way that solve this problem is to increase the generating capacity. Conventional fire power generation demand a huge coal, oil and other non-renewable resources. And it will produce large amounts of toxic and harmful gases and dust in the energy conversion process, they will pollute the environment, this is contrary to the sustainable development strategy. So the most effective way to resolve this contradiction is using a safe, reliable and pollution-free way of generation to compensate for the shortage of electricity, this is wind power generation.A survey report of the United Nations has displayed that wind energy and solar energy have the largest development space and the most favorable to the human in the all clean energy, such as hydropower, wind energy, solar energy and biomass energy. Wind energy is an inexhaustible and clean energy, this is the most prominent advantage of generation by wind energy. In the energy conversion process, wind speed is only reduced and it does not produce pollution.Wind turbine is the most important part in the wind power, and drive train is the most critical mechanical component in the wind turbine. Drive train dynamic performance will make a great impact on the life of the wind turbine. This article’s focus is to find a way for researching dynamic performance of wind turbine overall drive train, identifying the resonance frequencies of drive train and the corresponding speed of hub.A large scale wind turbine is illustrated in this article. First, the structures of the large scale wind turbine and the drive train principle of work are introduced, and the dynamics theory is elaborated about wind turbine. Then, drive train dynamics model is established according to using SIMPACK dynamics simulation software, and the dynamics model boundary conditions are set for the simulation calculations, static equilibrium, frequency domain analysis and time domain analysis are done about the model, the resonance points are determined by comprehensive consideration of the calculation results of each condition in the drive train; last, the wind turbine dynamics model is established by using BLADED software under the parameters consistency, and the calculation results from two kinds software are compared for verifying the correctness of the method that is used in this article.The study show that the wind turbine does not exist apparent resonance points in this article, this is consistent with the actual running situation; and the result that SIMPACK and BLADED calculation results are compared show two kinds software calculation deviation is less than5percent. So this analysis method is correct in this article, that will lay the foundation for studying the larger-capacity wind turbine drive train dynamic performance.