Open AccessOptimal wave energy extraction for oscillating water columns using second‐order sliding mode control
Author(s) -
Mosquera F. D.,
Evangelista C. A.,
Puleston P. F.,
Ringwood J. V.
Publication year - 2020
Publication title -
iet renewable power generation
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.005
H-Index - 76
eISSN - 1752-1424
pISSN - 1752-1416
DOI - 10.1049/iet-rpg.2019.1392
Subject(s) - robustness (evolution) , oscillating water column , control theory (sociology) , context (archaeology) , sliding mode control , renewable energy , computer science , power (physics) , energy (signal processing) , engineering , control engineering , control (management) , nonlinear system , mathematics , wave energy converter , artificial intelligence , electrical engineering , paleontology , biochemistry , chemistry , statistics , physics , quantum mechanics , biology , gene
Ocean waves are an important renewable energy resource and several fields of R & D are concurrently working to improve technologies for harnessing their power. In that context, this study presents a control to optimise the performance of oscillating water column systems. As a first contribution, a novel criterion to attain maximum wave energy extraction is developed, resulting in an enhancement of the global power efficiency of the system. Then, taking advantage of the proposed criterion, a second‐order sliding mode control set‐up is designed, with power extraction maximisation the primary objective and reactive power regulation a secondary one. Simulation results confirm the highly satisfactory performance of the proposed controller and its robustness in the presence of the inherent uncertainties and disturbances in the non‐linear system.