Control of an open-loop hydraulic offshore wind turbine using a variable-area orifice

D Buhagiar, T Sant, MK Bugeja - International …, 2015 - asmedigitalcollection.asme.org
International Conference on Offshore Mechanics and …, 2015asmedigitalcollection.asme.org
The viability of offshore wind turbines is presently affected by a number of technical issues
pertaining to the gearbox and power electronic components. Current work is considering the
possibility of replacing the generator, gearbox and electrical transmission with a hydraulic
system. Efficiency of the hydraulic transmission is around 90% for the selected geometries,
which is comparable to the 94% expected for conventional wind turbines. A rotor-driven
pump pressurises seawater that is transmitted across a large pipeline to a centralised …
The viability of offshore wind turbines is presently affected by a number of technical issues pertaining to the gearbox and power electronic components. Current work is considering the possibility of replacing the generator, gearbox and electrical transmission with a hydraulic system. Efficiency of the hydraulic transmission is around 90% for the selected geometries, which is comparable to the 94% expected for conventional wind turbines. A rotor-driven pump pressurises seawater that is transmitted across a large pipeline to a centralised generator platform. Hydroelectric energy conversion takes place in Pelton turbine. However, unlike conventional hydro-energy plants, the head available at the nozzle entry is highly unsteady. Adequate active control at the nozzle is therefore crucial in maintaining a fixed line pressure and an optimum Pelton turbine operation at synchronous speed. This paper presents a novel control scheme that is based on the combination of proportional feedback control and feed forward compensation on a variable area nozzle. Transient domain simulation results are presented for a Pelton wheel supplied by sea water from an offshore wind turbine-driven pump across a 10 km pipeline.
The American Society of Mechanical Engineers
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