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This study investigates deep offshore, pumping Airborne Wind Energy systems,focusing on the kite-platform interaction. The considered system includes a 360m2 soft-wing kite, connected by a tether to a winch installed on a10-meter-deep spar with four mooring lines. Wind power is converted intoelectricity with a feedback controlled periodic trajectory of the kite andcorresponding reeling motion of the tether. An analysis of the mutual influencebetween the platform and the kite dynamics, with different wave regimes,reveals a rather small sensitivity of the flight pattern to the platformoscillations; on the other hand, the frequency of tether force oscillations canbe close to the platform resonance peaks, resulting in possible increasedfatigue loads and damage of the floating and submerged components. A controldesign procedure is then proposed to avoid this problem, acting on the kitepath planner. Simulation results confirm the effectiveness of the approach.

On the Kite-Platform Interactions in Offshore Airborne Wind Energy Systems: Frequency Analysis and Control Approach