Wind loads on sail-type wind turbines

What is the design load basis (DLB) for offshore wind turbines?

This report describes the full Design Load Basis (DLB) used for load calculations at DTU Wind Energy for offshore wind turbines. It is based on the first edition of the IEC 61400-3 standard, but also takes into account a few of the simplifications in load cases introduced during the revision IEC 61400-3, 2014.

Can a wind turbine be considered an offshore wind turbine?

As given in the IEC 61400-3 Ed. 1 standard, a wind turbine is to be considered as an offshore wind turbine, if its support structure is subject to hydrodynamic loading. The following figure taken from the same standard is used to define concepts related to the support structure. 2. Design Load Cases

Do offshore wind turbines produce electricity?

Currently, offshore wind turbines (OWTs) are playing a pronounced role in producing wind electricity. Compared with onshore sites, offshore zones have stronger and more stable wind speed conditions, which are beneficial to the installation of OWTs in these sites.

Does DTU Wind energy need a design load basis (DLB)?

DTU Wind Energy is not designing and manufacturing wind turbines and does therefore not need a Design Load Basis (DLB) that is accepted by a certification body.

What is the wind speed range for normal operation?

The wind speed range for normal operation is here set to 4 – 26 m/s; however, it must be adjusted to the specific turbine, e.g. in case that the turbine has a storm controller.

How long is a 100 s wind turbine?

Length: 100 s Wind: 4 – 26 m/s with steps of 2 m/s Yaw: 0 deg Turbulence: None Waves Deterministic, NSS Shear: EWS: Equations (26) and (27) of IEC 61400-1 (Ed. 3) Gust: None Fault: None The extremes values over all wind speeds are extracted for each load sensor. This load case is only run for offshore wind turbines.