Impact of Short-Circuit Impedance Model for Variable-Speed Wind Turbine Generators on Operation of Overcurrent Relays L. Somi, B. Polajžer and G. Štumberger 2019/07/15

Abstract

This paper discussed different short-circuit impedance models for type 3 and type 4 wind turbine generators. IEC and IEEE-PES models are either simplified or they require additional data. The proposed model is given by a non-linear dependency of the short-circuit impedance and voltage on the medium voltage side of the unit transformer. Furthermore, the proposed model, as well as the constant impedance-based model were used for timing coordination of overcurrent relays in a
radial 6-bus network. The obtained results show that the constant impedance-based model overestimates short-circuit currents. Consequently, selectivity of individual overcurrent relays might
be questionable.

Authors and affiliations

L. Somi, B. Polajžer and G. Štumberger
University of Maribor. Faculty of Electrical Engineering and Computer Science. Maribor

Key words

Overcurrent relay, short-circuit calculation, wind turbine generators.

References

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