| Since the 21st century,with the rapid development of technology,the energy consumption increase severely.And the use of traditional fossil energy will cause a large amount of pollution which will accelerate environmental degradation.As a new energy,wind power has been put into use due to its large reserves,high utilization rate and mature technology.Have been put into practical use in many countries of the world.Wind turbine technology is divided into terrestrial wind turbine and offshore wind turbine.Compared with terrestrial wind turbine,offshore wind turbine started late,technically difficult,but offshore wind power is richer and stronger,it has more research value,so this paper selects offshore wind turbine as subjects in the study,and mainly study the problems of offshore wind turbine platform and tower.According the current research model,this paper choose the US National Energy Laboratory's(NREL)three-floating-body turbine platform(OC4-DeepCwindSemi),modeling according to the published turbine data and analyzing time domain simulation by FAST software.The time-domain dynamic response characteristics of the three-floating-body platform in regular waves and irregular waves are calculated and analyzed.On this basis,the turbine model was made according to the scale ratio,and the motion characteristics data of the model were measured by the experiment.Finally,the numerical simulation and experimental results are compared.As a result,the effects of wind speed and wave on the dynamic response of the wind turbine are basically the same,and the verification research has certain rationality.The specific research contents of this paper are as follows:(1)The development prospects and types of floating wind turbines are analysed,and the three-floating-body turbine platforms are selected as research targets.(2)Analyze the turbine dynamic response under windless conditions,average sea breeze(8.7m/s),rated wind speed of the turbine(11.4m/s)and different incident angles of irregular waves by FAST software for time domain simulation analysis,As a result,the dynamic response time history curves were obtained under 54 working conditions These curves show that the tower vibration displacement reach the largest when the wavelength is close to the platform length,the tower vibration is severe when the wave incident angle is 75°,and the maximum value can reach 2.93m.The dynamic response of the platform is not significantly affected by changes in the angle of incidence of the waves(3)Based on the three-floating-body turbine platform simulated by FAST software,the turbine models is made to command according to the ratio of 1:30,and the pool test study is carried out under the designed 54 test conditions.Under the action of individual waves,the displacement of the tangential direction of the tower and the beat direction of the tower are decreasing with the wavelength;when the wind and waves both effect,the tower is affected by the wind load,the displacement change and wavelength is not become linear relations,and the wind's dynamic response is affected by the wind load,it does become obvious as the wavelength changes.Comparing the data results,it is found that the test results are basically consistent with the numerical simulation results,which verify the rationality of the design. |
PDF Full Text Request