Abstract
This article highlights the evolution and use of floating platforms in the field of offshore turbines. While floating platforms are not new – oil and gas producers have built very large tension-leg platforms and others for drilling and processing – wind turbines present different problems. Modeling tools have evolved to predict the response of a fully coupled wind turbine and its substructure. Keeping costs down is critical for offshore developers. DeepCwind’s semisubmersible platform is constructed of prestressed concrete and steel, the result of vigorous testing of a variety of potential designs. In shallow water, contractors can economically build a fixed platform and install the turbine and its tower. In deep water, floaters make more sense, although they are not small structures. Besides the tower, they must support at least 350 metric tons, the weight of the nacelle and rotor blades of a 6 MW Siemens direct-drive turbine, which the company claims are the lightest in class.
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