In this paper, a floating overhead power transmission system (FOPTS), which has the potentiality to lower the electricity transmission cost for offshore renewable energy, is studied. In the design, a sheave mechanism is applied to mount one end of conductor on its supportive tower to reduce the coupling effects between the conductor and the towers. Then, a mathematical optimization approach, which can take account of the system's natural frequencies to avoid first-order wave excitation, is proposed to design the properties of the floating foundation and the conductor. In the modeling, the flexibility of the conductor is taken into account by a lumped parameter method. The aero-hydro-elastic dynamics of the system can be analyzed by the numerical model. A moderate FOPTS in a harsh ocean environment with wind speed of 70 m/s and significant wave height of 14 m is studied with emphasis on wind–wave misalignment. The reliability and issues of the system are discussed based on fully coupled time-domain simulation.
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