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Formulation of an Operation Theory for Wind-Generators with Controlled Variable Speed-Ratio

Formulation of an Operation Theory for Wind-Generators with Controlled Variable Speed-Ratio The basic variables relevant to wind generation systems were formulated in this study as to relate the operational torque coefficient to the power output and wind velocity. A dimensionless number connecting wind velocity, power output, generator speed, turbine size and air density was identified and shown to be the pivotal independent parameter of the wind-generator operation.An optimization criterion based on this mathematical formulation was developed. It relates the gearbox's speed-ratio to the newly defined wind generator number. This led, in turn, to the introduction of a variable speed-ratio gearbox that has a constant speed output and a variable turbine shaft-speed to be controlled in such a way as to match continuously and optimally the operation condition.Making use of a reported experimental study of a variable pitch-angle turbine driving an induction generator, a demonstration of the design procedure was presented. The model was shown to accurately predict the experimentally produced results. The demonstration proceeded to predict the optimum performance for the reported system. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Wind Engineering SAGE

Formulation of an Operation Theory for Wind-Generators with Controlled Variable Speed-Ratio

Siddig, Mohammed Hashim
Wind Engineering , Volume 35 (5): 9 – Oct 1, 2011
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References (4)

Publisher
SAGE
Copyright
© 2011 SAGE Publications
ISSN
0309-524X
eISSN
2048-402X
DOI
10.1260/0309-524X.35.5.615
Publisher site
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Abstract

The basic variables relevant to wind generation systems were formulated in this study as to relate the operational torque coefficient to the power output and wind velocity. A dimensionless number connecting wind velocity, power output, generator speed, turbine size and air density was identified and shown to be the pivotal independent parameter of the wind-generator operation.An optimization criterion based on this mathematical formulation was developed. It relates the gearbox's speed-ratio to the newly defined wind generator number. This led, in turn, to the introduction of a variable speed-ratio gearbox that has a constant speed output and a variable turbine shaft-speed to be controlled in such a way as to match continuously and optimally the operation condition.Making use of a reported experimental study of a variable pitch-angle turbine driving an induction generator, a demonstration of the design procedure was presented. The model was shown to accurately predict the experimentally produced results. The demonstration proceeded to predict the optimum performance for the reported system.

Journal

Wind Engineering – SAGE

Published: Oct 1, 2011

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