Dynamic analysis of a novel semi-submersible platform for a 10 MW wind turbine in intermediate water depth

A conceptual semi-submersible platform in the moderate water depth is proposed through fully coupled analysis using aeeo-hydro-servo-elastic code to support the Technical University of Denmark (DTU) 10 MW wind turbine. The intact stability of the newly designed semi-submersible floating offshore wind turbine (FOWT) is assessed based on DNV structure, and comparison with LIFES 50+ OO-Star platform is presented to verify the numerical model. The effect of mooring line damping on the dynamic behaviors of the conceptual FOWT is investigated. Additionally, the dynamic responses of the conceptual FOWT under different fault conditions is examined, including grid loss, blade seize without shutdown and blade seize with the shutdown, and a comparative study on the dynamic behaviors of the conceptual FOWT under operational and fault conditions is implemented. The results show that the proposed concept FOWT has a good stability, and the shutdown fault conditions have the most significant impact on its dynamic behaviors.