This thesis focuses on the time domain response under extreme deterministic wind gusts, for which simulations are carried out in order to assess the turbine’s performance and build a database: softwares SIMA, FAST and Matlab are used for the task.
Based on equations of motion of platform, a simplified dynamic wind turbine model in spired by the DTU 10-MW RWT is built in Matlab to study extreme response subjected to deterministic gusts defined in DNV-OS-J103: Design of Floating Wind Turbine Structures. The simple model includes generator torque and a blade pitch control system converted from the NREL 5-MW turbine source code in FAST, written in Fortran. Extreme loads on the mooring system can be assessed by surge and pitch offsets of the platform in the output.
Contrasting results from SIMA and Matlab and analyzing different gust shapes, the extreme (worst) deterministic gust are found.