DESIGN AND EXPERIMENTAL VALIDATION OF HYDRAULIC YAW SYSTEM FOR MULTI MW WIND TURBINE
Keywords:
hydraulic, yaw, model, test rig, verificationAbstract
To comply with the increasing demands for life time and reliability of wind turbines as these grow in size, new measures needs to be taken in the design of wind turbines and components hereof. One critical point is the initial testing of the components and systems before they are implemented in an actual turbine. Full scale hardware testing is both extremely expensive and time consuming, and so the wind turbine industry moves more towards simulations when testing.
In order to meet these demands it is necessary to use valid system models of in order to introduce new technologies to the wind turbine market. A hydraulic yaw system is such a new technology, and so a mathematical model of the full scale system and test rig system is derived and compared to measurements from the system. This is done in order to have a validated model, which wind turbine manufacturers may use for test in their simulation environment. The model and the test rig are tested against different design load cases and the results are compared. The experiments show that the model is valid for comparing the overall dynamics of the hydraulic yaw system. Based on the results it is concluded that the model derived is suitable for testing of the dynamic behavior in wind turbine manufacturer’s full scale aero elastic code.
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References
Jonkman, J., Butterfield S. and Scott, G., 2009. Definition
of a 5-MW Reference Wind Turbine for Offshore
System Development, NREL
McCloy, D. and Martin, H. 1980. Control of Fluid
Power: Analysis and design, 2nd edition. Ellis Horwood
Limited
Otis, D. R. and Pourmovahed, A. 1985. An Algorithm
for Computing Non flow Gas Processes in Gas
Springs and Hydro pneumatic Accumulators, Journal
of Dynamic Systems, Measurement, and Control,
, pp. 93 - 95
Pedersen, F. T., Gottschall, J., Kristoffersen, Runge,
J. and Dahlberg, J.-Å. 2011. Yawing and performance
of an offshore wind farm, Proceedings,
EWEA
(a) Stubkier, S. and Pedersen, H. C. 2011. Design,
Optimization and Analysis of Hydraulic Soft Yaw
System for 5 MW Wind TurbineWind Engineering
Vol. 35, pp 529 - 550.
(b) Stubkier, S. and Pedersen, H. C. 2011. State of the
art-hydraulic yaw systems for wind turbines, Proceedings
of the 12th Scandinavian International
Conference on Fluid Power, Tampere University of
Technology, Finland
Stubkier, S. and Pedersen, H. C. 201x.Investigation
of Self -Yaw and its Potential using a Hydraulic
Soft Yaw System for 5 MW Wind Turbine, submitted
to Wind Engineering
Stubkier, S., Pedersen, H. C., Andersen, T. O. and
Markussen, K. 2011. Preliminary findings of soft
yaw concept, Fluid Power and Mechatronics
(FPM), 2011 International Conference on, pp. 456 -
