Modeling and investigation of load and motion characteristics of offshore floating wind turbines

Development of offshore floating wind turbines is the future trend of wind power technology. However, due to the complex service environment, they are still in the exploratory stage without large-scale commercial application. Especially, the understanding of its load and motion characteristics is still lack. For this reason, firstly, a structure model of offshore wind turbines is proposed, and then multiple coordinate systems are established to describe the multiple loads and motion characteristics. Then, multiple load models including wind load, wave load, gravity load, centrifugal force and inertia load are established. To solve the complex motion process, it is divided into translational motion and rotational motion, and the idea of progressive iteration is used to solve the problem. Finally, in the Simulink environment, the input wind model, blade (wind turbine rotor) model, shaft model, generator model, converter model, grid model, controller model, pitch model, floating platform model and other models are integrated and the numerical simulation investigation is carried out. The simulation results can be used to analyze the running load and motion characteristics of the floating wind turbines, which is helpful to understand the operation mechanism and provide a reference for the design and control.