ECN publication
PHATAS-III user's manual: Program for Horizontal Axis wind TurbineAnalysis and Simulation version III
Published by: Publication date:
ECN 1996
ECN report number: Document type:
ECN-C--95-040 ECN publication
Number of pages: Full text:
124 Download PDF  

The title program is developed for the calculation of the dynamicbehaviour and the corresponding loads on a Horizontal Axis wind Turbine (HAT) in time domain. The program is in particular appropriate for the analysis of the dynamic loads in the main parts of the HAT structure with emphasis on the structural dynamic degrees of freedom including structural damping. All mutual interactions of the structural dynamic degrees of freedom as well as the interactions with the aerodynamic loads are fully described. Major additions of the program PHATAS-III with respect to PHATAS-II are: an optional correction on the airfoil properties for the 3D effects due to the span wise pressure gradient and the centrifugal loads on the boundary layer; structural damping for blade bending deformation; an option for the aerodynamic influence (stagnation) of a lattice tower; an optional model for the instationary and skewed inflow effects of the wake; option to read SWIFT wind data files with 3D turbulence components; flexible gearbox support with torsional stiffness and damping; models for instationary synchronous and asynchronous generator characteristics. Chapter 2 of this manual contains a description for using PHATAS. The input variables are described in chapter 3. The output properties and the use of the postprocessor 'phpost' are described in chapters 4 and 5, respectively. The program PHATAS has three routines in which control algorithms, generator characteristics and specifications for transient conditions can be linked to the code. A description of these routines, their parameter lists and some included files with common blocks is presented in chapter 6. Finally, chapter 7 contains some remarks on the limitations of PHATAS and on some numerical aspects of the calculations. Two examples of the use of PHATAS are included in appendix A, which are based to a large extent on the wind turbine model as described by the default values of the input properties. Appendix B contains a description of some tools provided with PHATAS that can be used for processing of the output data. 26 figs., 9 tabs., 2 appendices, 11 refs.

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