A numerical study on the performance of the point absorber Wave Energy Converter integrated with an adjustable draft system

The Power Take-Off (PTO) rating of Wave Energy Converters (WECs) is generally much higher than the average extracted power. Scientific literature has indicated that downsizing PTO capacity to a suitable level beneficial for improving techno-economic competitiveness. In this paper, novel design, namely adjustable draft system, proposed point absorbers implement downsizing. A frequency domain model established calculate performance device. From analysis, two potential advantages are identified by installing system. Firstly, excitation force can be controlled adjusting buoy draft, which could utilized reduce required force. This helpful capacity. Secondly, relevant natural absorber adapted operating wave states varying improves power absorption. nonlinear approach adopted specifically spherical include Froude–Krylov and viscous drag results show forces have significant influence on absorption when close resonance regions. However, resulting from system still observed while considering forces. improved 27% 12% in particular cases regular irregular respectively.