Preliminary assessment of a semi-submersible floating wind turbine combined with pitching wave energy converters
Résumé
This paper synthesizes the technical feasibility study carried out for a hybrid ocean energy converter. The solution envisaged involves a 100m large semi-submersible platform designed with five columns and equipped with floating pitching Wave Energy Converters (WECs). This floating structure is mounted with a 5MW wind turbine. The present study covers power performance estimations and structural analysis. The first section describes the “Wave to Wire” model programmed in both frequency and time domain. The mathematical and hydrodynamic assumptions are highlighted together with the numerical model. The second part starts with the assessment of the performances of this device, carried out on in-house simulation codes. Based on combined wave and wind resources, the annual average absorbed power figures are compared with published results for existing ocean energy converters. The total rated power of the combined system reaches 10MW. Eventually, the last section approaches practical topics, directly related to the capital and operational costs inherent to an industrial development phase. The total steel mass of the semi-submersible is estimated first, from structural calculations carried out for a selection of 3D static loads cases. Then, the extreme loads from the WECs are taken into account for a second design phase.
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