Articles | Volume 4, issue 2
Research article
15 May 2019
Research article |  | 15 May 2019

Qualitative yaw stability analysis of free-yawing downwind turbines

Gesine Wanke, Morten Hartvig Hansen, and Torben Juul Larsen

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Cited articles

Corrigan, R. D. and Viterna, L. A.: free yaw performance of the MOD-0 large horizontal axis 100 kW wind turbine, NASA-Report; No. TM-83 19235, 1982. a, b
Eggleston, D. M. and Stoddard, F. S.: Yaw Stability, in: Wind Turbine Engineering Design, Van Nostrand Reinhold Company Inc., New York, USA, 205–211, 1987. a, b, c
Glasgow, J. C. and Corrigan, R. D.: Results of Free Yaw Test of the MOD-0 100-Kilowatt Wind Turbine, NASA-Report No. TM-83432, 1983. a
Hansen, A. C.: Yaw Dynamics of Horizontal Axis Wind Turbines, NREL-Report, No. TP-442-4822, 1992. a, b, c
Hansen, A. C. and Cui, X.: Analysis and Observation of Wind Turbine Yaw Dynamics, J. Sol. Energ. Eng., 111, 367–371, 1989. a
Short summary
In this paper the results of the stability analysis of a free-yawing downwind turbine are shown and the turbine's ability to align the rotor passively with the wind direction is investigated. The results show that a tilt angle causes the equilibrium yaw position of free-yawing downwind to be non-zero. It is shown that an increase in cone angle can stabilize the free-yaw mode significantly, while blade flapwise flexibility will increase the risk of an instability of the free-yaw mode.