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Abstract

Doubly fed induction generator (DFIG) based wind turbines are sensitive to grid faults due to utilising small-scale rotor side converter (RSC). The application of crowbar protection to improve the fault ride-through (FRT) capability of the DFIG converts it to a squirrel cage induction generator, which makes it difficult to comply with grid codes. This study proposes an innovative DC-link controllable fault current limiter (C-FCL) based FRT scheme for the RSC to improve the FRT capability of the DFIG. The proposed scheme replaces the AC crowbar protection and eliminates its disadvantages. The C-FCL does not affect the normal operation of the DFIG. By means of the proposed scheme, rotor over-currents are successfully limited during balanced and unbalanced grid faults, even at zero grid voltage. Also, the C-FCL prevents rotor acceleration and high torque oscillations. In this study, an analysis of the proposed approach is presented in detail. The performance of the proposed scheme is compared with the conventional crowbar protection scheme through simulation studies carried out in power system computer-aided design/electromagnetic transients, including dc software (PSCAD/EMTDC). Moreover, the main concept of the proposed approach is validated with an experimental setup and test results are presented.

Item Type:	Article
Authors/Creators:	Jalilian, Amin and Naderi, SB and Negnevitsky, Michael and Tarafdar Hagh, Mehrdad and Muttaqi, KM
Keywords:	power system computer-aided design;doubly fed induction generator;electromagnetic transients;controllable DC-link fault current limiter augmentation;fault ride-through capability;DFIG;DC chopper;dc software;wind turbines;small-scale rotor side converter;
Journal or Publication Title:	IET Renewable Power Generation
Publisher:	Institution of Engineering and Technology
DOI / ID Number:	https://doi.org/10.1049/iet-rpg.2016.0146
Copyright Information:	Copyright 2017 Institution of Engineering and Technology
Additional Information:	This paper is a preprint of a paper accepted by IET Renewable Power Generation and is subject to Institution of Engineering and Technology Copyright. The final version is published, and a the copy of record is available at the IET Digital Library.
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