Publicações

Calvário, M., Gaspar, J.F., Sinha, A. e Guedes Soares, C. (2016), “Optimization of an oil-hydraulic Power Take-Off system based on an adaptable mechanism interface”, Progress in Renewable Energies Offshore, Guedes Soares, C., (Ed.), Taylor & Francis Group, London, UK, pp. 435-443

The Wave Energy Converter (WEC) is used to extract energy from waves which is converted into electrical power with a power take-off (PTO) system [1]. Oil-hydraulic PTO systems are commonly implement being an important issue the pressure developed in the cylinder because it affects the dynamic response of pumps, motors, vales, etc. and so on the PTO efficiency [2, 3]. Moreover the average pressure should remain above a critical value otherwise the conversion efficiency drops considerably. On the other hand large cylinder strokes due to technological constraints of these PTO systems must be avoided. Thus to achieve these requirements the WEC-PTO interface mechanism should be analyzed in more detail. The contribution of this work is to optimize the harvested wave power of an oil-hydraulic based PTO system with a WEC-PTO interface mechanism adaptable to different sea states. The study includes technological constraints on the PTO, which are a minimum averaged hydraulic pressure of 170 bar and a cylinder stroke constrained to 3 m. The interface mechanism of the Wavestar prototype [4, 5] is used in this case study, modified and presented. An optimized version of the interface mechanism is modelled and simulated for three different sea states conditions and the corresponding control and geometric optimal parameters are determined with an optimization algorithm [6]. The simulation results of harvested power are then compared between the interface versions and presented.

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