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.

Published in: Renewable Energy & Power Quality Journal (RE&PQJ, Nº. 17)
Pages: 300-304 Date of Publication: 2019/07/15
ISSN: 2172-038X Date of Current Version:2019/04/10
REF: 293-19 Issue Date: July 2019
DOI:10.24084/repqj17.293 Publisher: EA4EPQ

 

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

[1] IEC 60909-0 (2016): “Short-circuit currents in three-phase AC systems”, Part 0: Calculation of currents, 2016.
[2] R. A. Walling, E. Gursoy, and B. English, “Current Contributions from Type 3 and Type 4 Wind Turbine Generators During Faults”, IEEE PES T&D Conference and Exposition, Orlando, FL, USA, May 7-10, 2012.
[3] IEEE PES Joint Working Group, “Fault Current Contributions from Wind Plants”, 68th Annual Conference for Protective Relay Engineers 2015, TX, USA, March 3-April 2, 2015.
[4] T. Kauffmann, U. Karaagac, I. Kocal, et. al. “Phasor Domain Modeling of Type III Wind Turbine Generator for Protection Studies”, General Meeting of the IEEE PES, Denver, CO, USA, July 26-30, 2015.
[5] U. Karaagac, T. Kauffmann, I. Kocal, et. al. “Phasor Domain Modeling of Type IV Wind Turbine Generator for Protection Studies”, General Meeting of the IEEE PES, Denver, CO, USA, July 26-30, 2015.
[6] H. H. Zeineldin, H. M. Sharaf, D. K. Ibrahim, and E. El- Din Abou El-Zahab, “Optimal Protection Coordination for
Meshed Distribution Systems with DG Using Dual Setting Directional Over-Current Relays”, IEEE Trans. Smart Grid, vol. 6, no. 1, pp. 115-123, 2015.
[7] V. C. Nikolaidis, E. Papanikolaou, and A. S. Safigianni, “A Communication-Assisted Overcurrent Protection Scheme for Radial Distribution Systems with Distributed Generation”, IEEE Trans. Smart Grid, vol. 7, no. 1, pp. 114-123, 2016.
[8] L. Huchel, and H. H. Zeineldin, “Planning the Coordination of Directional Overcurrent Relays for Distribution Systems Considering DG”, IEEE Trans. Smart Grid, vol. 7, no. 3, pp. 1642-1649, 2016.
[9] K. Pereira, B. R. Pereira Jr., J. Contreras, and J. R. S. Mantovani, “A Multi-Objective Optimization Technique to Develop Protection Systems of Distribution Networks with Distributed Generation”, IEEE Trans. Power Syst., vol. 33, no. 6, pp. 7064-7075, 2018.
[10] IEC 60255-151 (2016); “Measuring Relays and Protection Equipement”, Part 151: Functional Requirements for
Over/Under Current Protection”, 2009.
[11] IEEE Standard C37.112 (R2007); “Inverse-Time Characteristic Equations for Overcurrent Relays”, 2007.
[12] K. V. Price, R. M. Storn, and J. A. Lampinen, Differential Evolution – A Practical Approach to Global Optimization,
Springer, 2005.