Thermal Characteristics Analysis Of High Speed Transmission System Of Wind Turbines

Wind energy is rapidly increasing in the world.Wind power generation has become an emerging energy with commercial prospects.The reliability of the gear box high-speed transmission system has a very important influence on the performance of the wind turbine.In depth study of the thermal structure characteristics of high speed transmission system,there is great significance to improve the service life and reliability of the system.One of the common faults in the transmission system of the double-fed wind turbine is out of alignment.When there is misalignment,it will cause the vibration of the unit.At the same time,it has an important influence on the temperature field of the high-speed gear shaft and the main shaft of the generator.To explore the change regulation of temperature field has great engineering significance.Supported by the National Natural Science Foundation of China,"research on fault mechanism and diagnosis technology of coaxial degree error of double-fed wind turbines"(51577008).The high speed transmission system of double fed wind turbine is used as the research object to conduct temperature field characteristic analysis.Modeling and simulation software is used.The thermal characteristics of the misalignment in the transmission system are explored.Firstly,the main components of the double-fed wind turbine are analyzed,including gear box,coupling and generator.And its motion characteristics and structure are analyzed.The structure of the transmission system of wind turbine is determined.The parallel misalignment,temperature misalignment and integrated misalignment of high-speed drive system are calculated.Secondly,according to the structural parameters,the SolidWorks 3D software is used to model the structure.Then the model is transformed into the corresponding model into Adams to conduct dynamic simulation.The correctness of the model is verified.In the Adams post processing module,the time domain characteristics of the high-speed gear shaft are extracted.Then,the high-speed gear shaft and the main shaft of the generator are introduced into Hypermesh to divide the grid.After reaching the required precision,the model is imported into Ansys Workbench.According to the basic theory of heat transfer,the boundary conditions for the finite element analysis of the transmission system are determined.Temperature field and thermal structure coupling analysis is conducted.Finally,the temperature prediction of the high-speed transmission system for the wind turbine,based on temperature simulation data of the gear shaft and the main shaft of the generator,PSO-LSSVM as tools and PCA dimension reduction is carried out.The temperature field prediction model of high speed transmission system is established to lay the foundation for the follow-up work.