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Energies 2015, 8(3), 2230-2267; doi:10.3390/en8032230

Modeling Innovative Power Take-Off Based on Double-Acting Hydraulic Cylinders Array for Wave Energy Conversion

1
Energy Unit, Tecnalia, Mikeletegi Pasealekua 2-Miramon Donostia-San Sebastián, Gipuzkoa E-20009, Spain
2
Automatic Control and Systems Engineering Department, School of Engineering, University of the Basque Country, Alameda Urquijo Bilbao, Bizkaia E-48013, Spain
*
Author to whom correspondence should be addressed.
Academic Editor: John Ringwood
Received: 28 January 2015 / Revised: 27 February 2015 / Accepted: 2 March 2015 / Published: 20 March 2015

Abstract

One of the key systems of a Wave Energy Converter for extraction of wave energy is the Power Take-Off (PTO) device. This device transforms the mechanical energy of a moving body into electrical energy. This paper describes the model of an innovative PTO based on independently activated double-acting hydraulic cylinders array. The model has been developed using a simulation tool, based on a port-based approach to model hydraulics systems. The components and subsystems used in the model have been parameterized as real components and their values experimentally obtained from an existing prototype. In fact, the model takes into account most of the hydraulic losses of each component. The simulations show the flexibility to apply different restraining torques to the input movement depending on the geometrical configuration and the hydraulic cylinders on duty, easily modified by a control law. The combination of these two actions allows suitable flexibility to adapt the device to different sea states whilst optimizing the energy extraction. The model has been validated using a real test bench showing good correlations between simulation and experimental tests. View Full-Text
Keywords: hydraulic power take-off; PTO; PTO Model; wave energy conversion; WEC; PTO simulation hydraulic power take-off; PTO; PTO Model; wave energy conversion; WEC; PTO simulation
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Antolín-Urbaneja, J.C.; Cortés, A.; Cabanes, I.; Estensoro, P.; Lasa, J.; Marcos, M. Modeling Innovative Power Take-Off Based on Double-Acting Hydraulic Cylinders Array for Wave Energy Conversion. Energies 2015, 8, 2230-2267.

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