Nonlinear Moment-Based Optimal Control of Wave Energy Converters With Non-Ideal Power Take-Off Systems

• Published in: Volume 8: Ocean Renewable Energy
• Main Authors: Nicolas Ezequiel Faedo, Giuseppe Giorgi, John V. Ringwood, Giuliana Mattiazzo
• Other Authors: Faedo, NICOLAS EZEQUIEL, Giorgi, Giuseppe, Ringwood, John V., Mattiazzo, Giuliana
• Format: Conference Object
• Language: unknown
• Published: ASME 2022
• Subjects: Arctic
• Online Access: https://hdl.handle.net/11583/2979744; https://doi.org/10.1115/OMAE2022-81267; https://asmedigitalcollection.asme.org/OMAE/proceedings/OMAE2022/85932/V008T09A082/1148002

The mechanical-to-electrical energy conversion stage in wave energy devices is commonly affected by losses associated with the power take-off (PTO) system, inevitably leading to non-ideal conversion in practical scenarios. Such behaviour needs to be incorporated within the wave energy converter (WEC) energy-maximising control design procedure, so as to guarantee optimal operation of the device under these non-ideal conditions. Motivated by this requirement, we present, in this paper, a nonlinear moment-based energy-maximising control solution for WECs under non-ideal PTO behaviour. We show that the mathematical formalism proposed always admits a globally optimal energy-maximising solution, facilitating the application of state-of-the-art numerical routines, leading to real-time performance. Numerical results are presented for a heaving point absorber WEC system, illustrating the capabilities of the proposed controller in a non-ideal PTO conversion scenario, including a comparison with a benchmark control str