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Abstract

OWC devices equipped with variable pitch-angle turbines, increase energy output. The postponement of blade stalling, improves aerodynamic efficiency. Flow control independent from pressure difference across the turbine, increases hydrodynamic efficiency. Isentropic turbines produce maximum power with optimal or phase-control.

Flow and pressure are out of phase in parts of the wave cycle, meaning that the turbine works as a compressor, feeding energy into the water, recoverable in expansion phase. Requiring in advance knowledge of incident waves leads to sub optimal control methods.

Turbine losses were included in assuming constant turbine efficiencies, for expansion and compression phases. In this work instantaneous efficiency is the basis for control methods of the variable pitch-angle turbine to be installed at the Pico plant. Versions of the control procedure and the influence of wave conditions in energy production are investigated.

Additional information

Authors: VAKALIS I, Institute for Systems, Informatics and Safety (ISIS), Ispra (IT);SARMENTO A.J, MARETEC Instituto Superior Tecnico, Lisboa (PT)
Bibliographic Reference: An oral report given at: The Fourth European Wave Energy Conference. Organised by: Aalborg University. Held in: Aalborg (DK), 4-6 December, 2000
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