Simulation Analysis Of Offshore Wind Turbine Performance Under Complex Loads And Its State Predictability Study

Energy is vital to human survival and development,and it is a key factor in ensuring national security.Traditional fossil energy is limited and its consumption causes a series of environmental problems such as the greenhouse effect.As a sort of renewable energy source,wind energy has many advantages such as large reserves,clean and pollution-free,and wide distribution,and will play an important role in maintaining a green ecological environment,improving the energy structure,and mitigating the greenhouse effect in the future.China is rich in wind energy resources,suitable for the development of offshore wind power,offshore floating wind turbine has a broad prospect,the design and performance of its research is of great significance.In this paper,we focus on the prediction and application of wind turbine aerodynamic and hydrodynamic performance.On the one hand,we establish a reasonable and reliable model of wind turbine constant and non-constant aerodynamic performance to reveal the aerodynamic characteristics of wind turbine,and on the other hand,we establish a coupled prediction model of aerodynamic and hydrodynamic performance.The main research is as follows.1.By applying the frequency domain potential flow theory,the OC4-Deep Cwind semisubmersible floating body is analyzed for its frequency domain hydrodynamic performance,and its additional mass,amplitude response operator and first-order wave force and other important parameters are derived,which provide an important basis for the in-depth study of the hydrodynamic characteristics of the floating body.The hydrodynamic performance of the OC4-Deep Cwind semisubmersible floating body is initially evaluated through the frequency domain potential flow calculation,and the subsequent coupled time domain calculation of the whole wind turbine system is prepared.2.Applying the overall time domain calculation procedure,the overall dynamic response of the SNL13.2MW wind turbine with OC4-Deep Cwind semisubmersible floating body as the support structure was calculated,and the results of its motion response and load response performance under different wind wave conditions were obtained,and the different effects of wind and wave loads on the dynamic response performance of the system were discussed.The differences between the dynamic characteristics of 10 MW wind turbine and 13.2 MW wind turbine under normal operating conditions are compared.3.A wave energy harvesting device is designed and coupled in the mooring system of the wind turbine,followed by a comparative analysis of the effect of anchor chain breakage on the motion response of the wind turbine system under extreme environmental loads,and the effect of different mooring system arrangements on the motion response of the wind-wave combined power generation system.