Variable-Speed Wind Turbines with Doubly-Fed Induction Generators Part IV: Uninterrupted Operation Features at Grid Faults with Converter Control Coordination

A model of variable-speed wind turbines equipped with doubly-fed induction generators (DFIG) and controlled by partial-load frequency converters described in [1,2] is applied in power stability investigations. A technical feature of uninterrupted operation at grid disturbances of large wind farms with such variable-speed wind turbines is suggested and discussed. This technical feature is based on fast re-start of the rotor converter, which blocks at grid faults. The main reactive power control is organised by the rotor converter [3]. The new part is that reactive power is controlled by the grid-side converter when the rotor converter blocks. Possible discrepancies between the results reached with the detailed representation of the frequency converter and the representation where only the rotor converter is regarded are notified and explained. The converter representation details influence on the machine current transients modelled at grid disturbances and also on damping characteristics of torsional shaft oscillations.

[1]  Li Zhang,et al.  Application of a matrix converter for the power control of a variable-speed wind-turbine driving a doubly-fed induction generator , 1997, Proceedings of the IECON'97 23rd International Conference on Industrial Electronics, Control, and Instrumentation (Cat. No.97CH36066).

[2]  Tore M. Undeland,et al.  DOUBLY FED INDUCTION GENERATOR IN A WIND TURBINE , 2002 .

[3]  J. A. Halliday.  Offshore Wind Energy – A Review of Some Current Research and Development Projects , 2001 .

[4]  Muammer Ermis,et al.  Double-output induction generator operating at subsynchronous and supersynchronous speeds: steady-state performance optimisation and wind-energy recovery , 1992 .

[5]  Vladislav Akhmatov.  Variable-Speed Wind Turbines with Doubly-Fed Induction Generators Part III: Model with the Back-to-back Converters , 2003 .

[6]  Vladislav Akhmatov.  Variable-speed Wind Turbines with Doubly-fed Induction Generators Part II: Power System Stability , 2002 .

[7]  M. Bruntt,et al.  Incorporation of wind power in the east Danish power system , 1999, PowerTech Budapest 99. Abstract Records. (Cat. No.99EX376).

[8]  Vladislav Akhmatov,et al.  Variable-Speed Wind Turbines with Doubly-Fed Induction Generators , 2002 .

[9]  P. Kundur,et al.  Power system stability and control , 1994 .

[10]  T. Ackermann,et al.  World-wide offshore wind potential and European projects , 2001, 2001 Power Engineering Society Summer Meeting. Conference Proceedings (Cat. No.01CH37262).

[11]  Vladislav Akhmatov.  The Mutual Effects of Grid and Wind Turbine Voltage Stability Control , 2001 .

[12]  Jon Clare,et al.  Doubly fed induction generator using back-to-back PWM converters and its application to variable-speed wind-energy generation , 1996 .