Browsing by Keyword "OWC"
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Item A comparative analysis of Oscillating Water Column turbines(Institute of Electrical and Electronics Engineers Inc., 2018-08-23) Otaola, Erlantz; Garrido, Aitor J.; Garrido, Izaskun; Lekube, Jon; Tecnalia Research & InnovationWave energy seems to be one of the most promising alternatives to the current energy issue. Pursuant to this fact, different devices have been developed so as to harness the energy that waves contain. Amongst all of them, Oscillating Water Column-based systems arise as the preferable technology in the scientific world. Many efforts have been made in order to optimize the power extraction. However, there is still a long way to go in many areas, such as the correct turbine selection for a specific power plant. Therefore, this paper is devoted towards the comparison of different turbines existing nowadays for the case study of the Mutriku power plant.Item Improving the OWC Wave Energy Converter Power Take-Off Efficiency throughout Experimental and Numerical Characterisation of an SCIG(2024-03) Lopez-Mendia, Joseba; Robles, Eider; Ceballos, Salvador; Ruiz-Minguela, Pablo; Rotger, Jacobo; RENOVABLES OFFSHORE; POWER ELECTRONICS AND SYSTEM EQUIPMENTThe increasing interest in the use of renewable energy technologies is directing attention towards the potential contribution of marine energy technologies, especially ocean wave energy, to world energy demand. While open-sea demonstrations of full-scale devices have been carried out to validate several technologies, the focus now is shifting to optimising the components for efficiency and reliability. The efficiency of the electrical generator plays a crucial role in wave-to-wire numerical models for converting wave energy into usable electricity. It provides essential data that enables the industry to reduce technical risks and uncertainties. Wave-to-wire models typically simplify the generator’s efficiency through assuming a single curve based on the load. This curve is usually provided by the machine manufacturers for the nominal rotational speed. However, the rotational speed varies in the case of air turbines used in OWC devices. Therefore, to accurately estimate decision variables derived from these models, a comprehensive efficiency map is necessary. This map should demonstrate the performance at different rotational speeds and loads, as it directly influences the estimation of key parameters. The main objective of the present work is to improve the generator behaviour of an OWC for different generator operation regimes. For this purpose, a numerical model of the generator’s efficiency will be developed throughout the segregation of losses and validated experimentally. Finally, an optimal control law will be presented to maximise the electrical power output of the wave energy converter, considering the efficiency of both the generator and the turbine.