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Simplified approach for the optimal number of rotors and support structure design of a multi rotor wind turbine system

: Störtenbecker, S.; Anselm, R.; Dalhoff, P.

Volltext ()

Institute of Physics -IOP-, London:
The Science of Making Torque from Wind, TORQUE 2020 : 28 September - 2 October 2020, The Netherlands (online)
Bristol: IOP Publishing, 2020 (Journal of physics. Conference series 1618)
Art. 032009, 13 S.
International Conference "The Science of Making Torque from Wind" (TORQUE) <2020, Online>
Konferenzbeitrag, Elektronische Publikation
Fraunhofer IWES ()

In this study different multi rotor wind turbine systems (MRSs) are designed in such a way that the space frame, forming the connection between rotor nacelle assemblies (RNAs) and tower, will be modeled and dimensioned as an ideal truss work. The main focus is on multi digit MRSs (MD-MRS) with a high number of rotors. To dimension the tube diameters and wall thicknesses, a simplified load case is used with an adjusted safety factor for loads. Parameters that are varied are the number of rotors, depth of the space frame, as well as the location of the fixed bearing for the yaw system. As such, the simplified approach is a preliminary step helping to choose a good design parameter combination for a more detailed and comprehensive analysis. Buckling is a main design driver, as well as the thrust forces. For a high number of rotors, a fixed bearing position and therefore tower height, halfway through the space frame height seems favorable regarding the cost.