Models of a WTGS Operating in a Power System

  • Zbigniew Lubosny
Part of the Power Systems book series (POWSYS)


The chapter presents models of various types of WTGS, whose components were considered in the previous chapters. In this chapter the following types of wind turbine models are considered:
  • • WTGS equipped with squirrel-cage rotor asynchronous generator

  • • WTGS equipped with dynamic slip control system

  • • WTGS equipped with doubly-fed asynchronous machine

  • • WTGS equipped with synchronous generator (two types of converter are considered).


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  1. 1.
    This is, of course, a simplification because in practice the factor for Hv transmission lines is lower than for MV lines. Additionally, the HV transmission line capacitance is higher than the MV line capacitance.Google Scholar
  2. 2.
    Of course, the supervisory control system does exist in the case of the WTGS.Google Scholar
  3. 3.
    Data for the delta and star winding connection of asynchronous generator.Google Scholar
  4. 4.
    Italic typeface indicates assumed data.Google Scholar
  5. 5.
    All the controllers considered in this and the following section are PI-type controllers with parameters Kr, Ti. The utilization of controllers of this type are given as examples only and does not mean that these types of controller are or should be used in real WTGSs. The controller parameters are given in the figure captions. The parameters should not be treated as optimal either.Google Scholar
  6. 6.
    For modeling purposes, the Enron EW 900 wind turbine data have been utilized here. This WTGS was originally a system equipped with a doubly-fed asynchronous generator (considered in the next section). For the considerations conducted here, the use of this wind turbine.Google Scholar
  7. 7.
    Italic typeface indicates assumed data.Google Scholar
  8. 8.
    The change of the operating point depends on the power versus wind velocity P=-f(V) and motor mechanical t=f(w) characteristics.Google Scholar
  9. 9.
    This is in contrast to the previously and further considered WTGS with turbine speed contronller and generator power controller operating at full load.Google Scholar
  10. 10.
    Voltages Vdr,Vqr are recalculated on the stator side.Google Scholar
  11. 11.
    The real power transferred to the grid is equal to the sum of the stator and rotor power, I.e. Pg=Pgs+Pgr. The reactive power is equal to the difference of the stator power and the reactive power losses in a grid-side of converter and transformer.Google Scholar
  12. 12.
    The data in Italic typeface indicate assumed data.Google Scholar
  13. 13.
    The first state takes place at wind velocity slightly below 10 m/s, the second one at a wind velocity equal to 12 m/s.Google Scholar
  14. 14.
    This remark is related to the WTGS operation at full load. At partial load, elimination of real power variation is impossible for other reasons considered in this monograph.Google Scholar
  15. 15.
    The conclusions related to the results of the simulations presented in this chapter do not have general validity and cannot be considered as valid for the all wind turbines equipped with a given type of control system. The control system structures, algorithms, parameters and strategies in various types of WTGSs vary considerably.Google Scholar
  16. 16.
    The values printed in the Table and related to the WTGS equipped with a synchronous generator (Pn=500KW) are multiplied by factor 900/500 to allow comparison with other WTGSs(Pn=900kw).Google Scholar

Copyright information

© Springer-Verlag Berlin Heidelberg 2003

Authors and Affiliations

  • Zbigniew Lubosny
    • 1
  1. 1.Dept. Electrical Power SystemsGdansk University of TechnologyGdanskPoland

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