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Keywords:

  • wind turbine;
  • operational impedances;
  • simulation;
  • full-scale converter generator;
  • short-circuit currents;
  • synchronous generator;
  • IEC

ABSTRACT

This paper addresses the representation of the full-scale converter generator technology by equivalent operational impedances valid for short-circuit current calculations. Modern wind power plants are required and designed to ride through faults in the network, subjected to fault clearing. Accurate knowledge of the wind turbine short-circuit current contribution is needed for component sizing and protection relay settings during faults within the wind power plant collector system or in the external networks. The industry standard employs software packages where generators are represented by their equivalent synchronous generator operational impedances, calculated according to standards or for electromagnetic simulation models, when studying fault currents and protection settings for wind power plant installations. Hence, it is of importance to represent non-synchronous wind generators also by an equivalent synchronous generator. The effectiveness of the proposed method has been validated by simulation and site measurements. Copyright © 2013 John Wiley & Sons, Ltd.