Design and Installation of an Innovative Tension Leg Platform for 2 MW Offshore Wind Turbine at Baltic Sea

摘要

The Offshore Wind Resources in deep water, but also the currently experienced issues with conventionalrnfoundations, are driving the solution requirements for new offshore wind power platforms. The latestrnmonitoring results of German offshore wind farms show the challenges the industry is facing. Ecologicalrnimpacts as well as foundation technology issues are forcing the sector to look for alternatives. Thernpresentation will introduce a technology of a floating TLP-structure with a specific mooring linernconfiguration as an innovative foundation concept for offshore wind turbines suited for water depthsrngreater than 30 meters. The unique aspect of the GICON TLP is its modular, frame-work structure whichrnallows buoyancy and load transfer functions to be decoupled from each other and instead be applied tornthe specific structural elements. In contrast to classic TLP designs and semi-submersible floaters,rnadditional stabilizing effect achieved by this additional bracing minimizes the movement of the entirernsystem. Due to this stable behavior of the TLP standard offshore turbines as currently available in thernmarket should be usable for this platform. Furthermore results from model basin tests will be described.rnAlso the comparison of calculated and experimental data obtained by extensive tank experiments with arnscale model of an offshore turbine at Maritime Research Institute Netherlands (MARIN) in summer 2013rnwill be presented. These experiments include wind and wave loads that represent different sea states ofrnthe proposed location for the full scale prototype. In numerical simulations the dynamic behavior of thernTLP under linked hydrodynamic and aerodynamic loading is taken into account also regarding differentrngeometric configurations of the mooring line system and various types of anchorage systems at the searnfloor. Using characteristic Campbell-diagrams structural stiffness of each component is optimized aimingrnat a soft-stiff design of the TLP-structure. The results of the scaled tests at MARIN have confirmed thatrna superposition of internal forces of the moored structure in operation for wind and wave loads can bernassumed. Numerical modeling validation is confirmed by tank tests. Data and video from the tank testsrnwill be shared as part of the presentation. GICON researchers plan to install a full-scale pilot plant in thernGerman Baltic Sea in 2016.