Optimal Wave Energy Extraction for Oscillating Water Columns Using Second Order Sliding Mode Control

MOSQUERA, FACUNDO; EVANGELISTA, CAROLINA; PULESTON, PAUL; RINGWOOD, JOHN

IET RENEWABLE POWER GENERATION

INST ENGINEERING TECHNOLOGY-IET

Año: 2020

1752-1416

Ocean waves are an important renewable energy resource and several fields of R&D are concurrently working toimprove technologies for harnessing their power. In that context, this study presents a control to optimise the performance ofoscillating water column systems. As a first contribution, a novel criterion to attain maximum wave energy extraction isdeveloped, resulting in an enhancement of the global power efficiency of the system. Then, taking advantage of the proposedcriterion, a second-order sliding mode control set-up is designed, with power extraction maximisation the primary objective andreactive power regulation a secondary one. Simulation results confirm the highly satisfactory performance of the proposedcontroller and its robustness in the presence of the inherent uncertainties and disturbances in the non-linear system.