Dynamics Modeling And Performance Prediction Analysis Of Large-scale Wind Turbine

With wind turbine toward large-scale development, the complexity of wind turbines is increasing, which wind turbine system design and manufacturing have raised higher requirements. It is important to system design that correctly established system dynamics model of large-scale wind turbine and analyzing the performance. This paper describes a flexible multi-body dynamics modeling method and thinking, establishing a dynamic model of the whole system. In actual operation, MW wind turbine have slow response to turbulent, resulting in great fluctuation of wind turbine, causing fatigue loads, need to be use control strategy to improve the life of wind turbine. Meanwhile, in order to quickly effectiveness analysis simulate, artificial neural network simulation predicts shorter run times.The main research contents are as follows:Chapter ?: This paper studies the blade element momentum theory and modifies the classical blade element momentum theory. Establishing wind shear, tower shadow model and aerodynamic loads simulation model in Matlab/Simulink. The simulation results obtained blade axial and tangential factor, the rotor torque and output power variation, and compared the results with Bladed to verify the correctness of the model.Chapter ?: Research on the method of establishing a wind turbine structure dynamics simulation analysis model. In SIMPACK software platform, modeling wind turbine whole air-elastic coupling system dynamics. Taking a 5MW wind turbine for the study, co-simulation experiments, given kinetics of wind turbines.Chapter ?: To ensure the accuracy of the prediction in order to make up time-consuming limitations of the joint simulation method. Using a combination method of simulation analysis and neural network to analysis and forecasting wind turbine structural vibration, to provide a theoretical basis for the dynamic optimization design of wind turbine, has an important significance in engineering practice.Chapter ?: For the problem of rotor uneven load distribution, it describes wind turbine the basic variable speed pitch control strategy. Proposed LQG optimization pitch control method based on linear quadratic Gaussian control theory to improve blade and hub loading conditions under high wind conditions, reducing the load of blade flapping.