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EWEC 2006 – IEA ANNEX XXI SPECIAL SESSION

EWEC 2006 – IEA ANNEX XXI SPECIAL SESSION. Assessment of structural dynamics for model validation of induction generator-based wind turbines. Olimpo Anaya-Lara, G. Ramtharan Ervin Bossanyi and Nick Jenkins. IEA Annex XXI. Dynamic Models of Wind Farms for Power System Studies. OBJECTIVES.

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EWEC 2006 – IEA ANNEX XXI SPECIAL SESSION

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  1. EWEC 2006 – IEA ANNEX XXI SPECIAL SESSION Assessment of structural dynamics for model validation of induction generator-based wind turbines Olimpo Anaya-Lara, G. Ramtharan Ervin Bossanyi and Nick Jenkins IEA Annex XXI Dynamic Models of Wind Farms for Power System Studies

  2. OBJECTIVES • Suggest which representation of the rotor structural dynamics is more appropriate for a particular study to ensure the correct validation of dynamic models of Fixed-Speed Induction Generator (FSIG) and Doubly-Fed Induction Generator (DFIG) wind turbines • Develop FSIG and DFIG performance assessment during electrical transient such as three-phase faults (voltage dip) and network frequency variations • Conduct studies in GH Bladed, which offers a suitable common platform with highly developed mechanical/electrical systems of FSIGs and DFIGs

  3. Rotor structural dynamics Blade bending motions In-plane blade bending Out-of-plane blade bending Flexible structure of a wind turbine rotor As rotor size increases blade flexibiities becomes significant and need to be represented

  4. Frequency components of full rotor dynamics Frequency component of typical two-mass model Natural frequency of vibration Low-speed shaft torque response (and harmonic spectrum) with full rotor structural dynamics during a 50% voltage sag (300 kW FSIG-based wind turbine) • Single-mass model: neglects blade and shaft flexibility • Typical two-mass model: only considers shaft flexibility • Full model in Bladed: Complete representation of rotor structural dynamics (shaft and blade flexibilities)

  5. Assessment during a three-phase fault 300kW FSIG during a three phase fault (80% voltage drop, 20% retained voltage) 2MW DFIG during a three phase fault (85% voltage drop, 15% retained voltage)

  6. Assessment during frequency variation Applied frequency variation at the terminal of the generators 300kW FSIG-based wind farm 2MW DFIG-based wind farm

  7. Conclusion and recommendations • Rotor structural dynamics can influence the wind turbine response during electrical faults. Hence, for fault studies a model of the structural dynamics that includes both shaft and blades flexibilities may be more appropriate. • Rotor structural dynamics have little effect on wind turbine performance in the event of loss of generation (frequency variations), therefore a simple single-mass model representation of the rotor structural dynamics may be appropriate for this type of studies

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