Research On Wind Condition And Seismic Loads Of Performance And Structure Of Wind Turbine

With all kinds of extreme weather, fog haze, dust and other environmental problems appears frequently. It must develop and utilize the new energy. And the wind energy is one of the most development prospect energy in new energy. Under the development trend of large-scale wind turbine and generalization, more and more wind farm established in turbulent wind field and earthquake zones. So it is worthy to research the characteristics of the wind turbine on the condition of strong turbulent wind and seismic. The wind directly decides the aerodynamic and structural characteristics of wind turbine, which affect the power output, the stability and control strategy. It also shows different characteristics when wind turbine confronted earthquake. It uses the NREL package as the analysis platform, which joint the TurbSim, AeroDyn, FAST and Seismic to simulate the wind turbine structural dynamic response under the condition of different wind and seismic loads.Main research contents and conclusions of this paper are as follows:1. On the basis of modeling full field wind, it simulated five different wind fields with different speed or turbulence intensity. It set the rated speed and cut-out speed. The normal turbulence wind, Kelvin-Helmholtz billow and the wind which adds coherent turbulence to the background wind were simulated.2. Combined with the aerodynamic results, it simulated the dynamic response of the out-of-plane, in-plane tip deflections; out-of-plane, in-plane, pitching moments at the blade root. Variable speed & pitch were used as the wind turbine control strategy at the rated wind speed events. Under the wind of extreme turbulence, the control strategy was normal pitch-to-feather. Results show that the Kelvin-Helmholtz billow is more suitable for turbulence wind simulation. It can simulate coherent structure by adding a coherent turbulence wind on the background wind. At the same time, the study shows that compared with the reference wind speed is the rated speed, the cut-out wind speed simulations have bigger tip deflections. The average moment at the blade root is small, but the fluctuation in a short time span is big. It’s the main load of wind turbine blade fatigue.3. In addition, this paper established seven operating condition of seismic. It used the El Centro wave and synthetic motions as the input motions which consider the baseline correction and matching the target response spectrum. At the same time, it took into account the wind condition. Based on the analysis comparison, it shows that the structural dynamic response of the wind turbine under the IECKAI wind is quite different from the steady wind. Blades and tower can neglect the effect when the wind turbine runs into the earthquake under the IECKAI wind. On the other hand, the platform endures high loads as rigid body in large displacement. The platform connected to the tower base fixed, which also bears large loads. As if large loads occurs on the top of the tower, the wind turbine can appear capsized, which can cause complete wind turbine damage.