The validation of load simulations with offshore field measurements in the research wind farm Alpha Ventus, Germany, is presented in this paper. Simulations are carried out with the integrated load simulation tool Flex5-Poseidon, which treats the aerodynamics, hydrodynamics and elastic motion in a coupled dynamic analysis. The reference wind turbine is the REpower 5M with a jacket substructure installed in the North Sea, 45km offshore at 28m water depth. Comparisons are based on stresses and loads at the rotor blades, tower and substructure. High resolution measurements of a one year period form the basis for the comparison.

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