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Energies 2016, 9(4), 277; doi:10.3390/en9040277

Short-Circuit Calculation in Distribution Networks with Distributed Induction Generators

1
State Key Laboratory of Power Transmission Equipment & System Security and New Technology, Chongqing University, Chongqing 400044, China
2
School of Electricaland Electronic Engineering, Nanyang Technological University, Singapore 639798, Singapore
3
Department of Electrical Engineering, University of Wisconsin-Milwaukee, Milwaukee, WI 53211, USA
*
Author to whom correspondence should be addressed.
Academic Editor: João P. S. Catalão
Received: 19 January 2016 / Revised: 29 March 2016 / Accepted: 31 March 2016 / Published: 9 April 2016
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Abstract

This paper presents an improved current source equivalent model method to determine the short-circuit current of a distribution system with multiple fixed-speed and variable-speed induction generators (IGs). The correlation coefficients of flux components between stator and rotor under the unsymmetrical fault are analyzed using the positive and negative sequence steady-state equivalent circuits of an IG. The terminal voltage and current responses of fixed-speed and variable-speed IGs with and without the rotor slip changes under different penetration levels are compared to investigate the coupling relation between the short-circuit currents of IGs and the nodal voltages in the distribution network. Then the transient equivalent potential of an IG at the grid fault instant is derived. Sequence components of the short-circuit current in the network can be determined using the proposed technique. The correctness of the proposed method is verified using dynamic simulation. View Full-Text
Keywords: short circuit calculation; induction generator; symmetrical components; rotor slip; steady-state equivalent circuit; distribution network short circuit calculation; induction generator; symmetrical components; rotor slip; steady-state equivalent circuit; distribution network
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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Zhou, N.; Ye, F.; Wang, Q.; Lou, X.; Zhang, Y. Short-Circuit Calculation in Distribution Networks with Distributed Induction Generators. Energies 2016, 9, 277.

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