Dynamic Simulation and Control of a Semi-submersible Floating Offshore Wind Turbine with a Direct-Driving Permanent Magnetic Synchronized Generator

Abstract

This study aims to investigate a large semi-submersible floating wind turbine with a direct-drive permanent magnet synchronous generator under the environment of Taiwan Strait. The floating wind turbine is composed of LIFES50+ OO-Star Wind Floater Semi 10MW platform and IEA 10MW wind turbine. The co-simulation system is combined with the software of Simpack, MATLAB/Simulink and FAST. The model of the floating platform, mooring system, nacelle, and rotor blade are built in Simpack, which is a multibody system simulation software. FAST contains several subsystems, including aerodynamic software library, time-domain hydrodynamics module, and mooring analysis module can be used for aero-hydro-servo-elastic simulation. Hydrodynamic coefficients of the floating platform are preprocessing from WAMIT which is used to analysis the wave interaction with structures. Other parts of the system are built in MATLAB/Simulink, which include the direct-drive permanent magnet synchronous generator model, hydraulic blade pitch system, wind turbine controller. Different lengths of mooring system are compared and discussed to show the motion influence to the floating wind turbine. Finally, the developed models and controllers of the floating wind turbine were investigated under turbulence conditions to verify the performance of the controller.