Research On Flutter Characteristics Of Large-scale Wind Turbine Blade

Ningxia is located in the northwest inland plateau, the climate is continental semiarid, relatively drying and larger sand, with an average altitude of over 1000m. Most wind turbines are located in relatively harsh environment areas, such as Long head of the mountain, Hongsipu, Mahuangshan, The big puddle, The big battle, Sun Hill and so on. The wind turbines are often attacked by lightning, dust, snow and other harsh environments. According to related statistics, the failure of wind turbine blades account for about one-third of all failures. As the wind turbine blades are often in operation under random wind loads, so wind turbine blades are prone to chatter. Usually the chatter is harmful, causing structural damage and mechanical failure and lead to catastrophic accidents. Using prevention measure initial instead of passive maintenance later. In this way, wind turbine fault can be reduced and prevented fundamentally.In recent years, according to the statistics that failure of wind turbine, experience in operation and maintenance personnel, wind turbine blade flutter often lead to failure. Therefore, according to the needs of enterprises to research on this issue of wind turbine chatter, proposing an effective method of suppressing blade flutter to reduce the workload of operation and maintenance personnel, as well as save the maintenance cost for enterprises. The wind farm is located in Wuzhong Zone, it’s total installed capacity of more than 290MW, operating wind machine consists of 1.0MW,1.5MW,2.5MW mainly.In this paper, the 1.5MW wind turbine blade located in Sun Mountain Area as the research object to research on the wind turbine blade flutter during the process of running. The physical model based on the basic structure of the blade and the forces, and deriving differential equations of motion. To analysis the mechanism of blade flutter and research blade aero-elastic stability from the perspective of aeroelasticity. Proposing a method to suppress flutter from the perspective of energy conversion and the establishing the model of suppressing flutter. According to the numerical simulation for 1.5MW wind turbine blade by Matlab to verify the feasibility of the method.The simulation results can be seen that this method can effectively suppress the blade flutter, improve the stability of operation, reduce accidents of wind turbine, offer some guidance for wind turbine blade design optimization and predictive maintenance.