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Publications
Gaspar, J.F., Sinha, A., Calvario, M. and Guedes Soares, C. (2016), “Power Take-Off concept with flow proportional valves based rectification”, Maritime Technology and Engineering 3, Guedes Soares, C. & Santos T. A., (Eds.), Taylor & Francis Group, London, UK, pp. 1111-1118
This paper presents an improvement of a hydraulic Power Take-Off concept which uses a hydraulic transformer to store some of the wave energy into kinetic energy and then uses it to perform the reactive control of the Wave Energy Converter. This improvement was achieved with the replacement of piloted-to-close non-return valves, which rectify the bigger part of the useful wave power by sending it directly into the electrical generator station, with flow proportional valves. As revealed in this paper the use of these proportional valves solved the main difficulty of the PTO concept that was to operate with the same oil reference pressure in the pipeline, where the electrical generator station is connected, for a range of sea states. Moreover, several PTOs working at slightly different regimes, which would require different oil reference pressures to work efficiently, can be now attached on the same pipeline at the same reference pressure. The use of proportional instead of non-return valves adds approximately more 10% on the PTO overall hydraulic efficiency.
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