In this work, we demonstrate to what extent it is possible to use load optimisation to aerodynamically damp the floater motion of vertical-axis wind turbines. The loadform of a VAWT can be altered to the desired objective using an individual blade-pitch schedule. A coupled hydro- and aerodynamic simulation tool is built solving the equation of motion of the floating system in which the hydrodynamic loads and (frequency-dependent) matrices are modelled using the potential flow theory and the aerodynamic loads are computed using the Actuator Cylinder model. A blade-pitch optimisation schedule is included to redistribute the loads over the actuator with the objective to counter-act the hydrodynamic loads as much as possible without significant power loss. Using the simulation tool, it is shown that an intelligently determined blade-pitch schedule can decrease the floater motion, however, the potential of reducing the floater motion is limited by the fact that the aerodynamic loads are significantly smaller than the hydrodynamic loads especially for rough sea states.
|Number of pages||12|
|Journal||Journal of Physics: Conference Series|
|Publication status||Published - 3 Mar 2020|
|Event||North American Wind Energy Academy, NAWEA 2019 and the International Conference on Future Technologies in Wind Energy 2019, WindTech 2019 - Amherst, United States|
Duration: 14 Oct 2019 → 16 Oct 2019