2024-03-29T09:50:28Zhttps://repositori.uji.es/oai/requestoai:repositori.uji.es:10234/1338852019-11-18T21:11:15Zcom_10234_7034com_10234_9col_10234_8619
Repositori UJI
author
Rolán Blanco, Alejandro
author
Pedra Durán, Joaquín
author
Córcoles López, Felipe
2015-09-23T11:02:03Z
2015-09-23T11:02:03Z
2014-11
ROLÁN, Alejandro; PEDRA, Joaquín; CÓRCOLES, Felipe. Detailed study of DFIG-based wind turbines to overcome the most severe grid faults. International Journal of Electrical Power & Energy Systems, 2014, vol. 62, p. 868-878.
http://hdl.handle.net/10234/133885
http://dx.doi.org/10.1016/j.ijepes.2014.05.031
This paper studies the effects of voltage sags caused by faults on doubly-fed induction generators to overcome grid faults. A wide range of sag duration and depth values is considered. It is observed that sag duration influence is periodical. Sag effects depend on duration and depth and on the fault-clearing process as well. Two approaches of the model are compared: the most accurate approach, discrete sag, considers that the fault is cleared in the successive natural fault-current zeros of affected phases, leading to a voltage recovery in several steps; the least accurate approach, abrupt sag, considers that the fault is cleared instantaneously in all affected phases, leading to a one-step voltage recovery. Comparison between both sag models reveals that the fault-clearing process smoothes sag effects. The study assumes that the rotor-side converter can keep constant the transformed rotor current in the synchronous reference frame, thus providing insights into wind turbine fault ride-through capability. The voltage limit of the rotor-side converter is considered to show the situations where the rotor current can be controlled. Finally, a table and a 3D figure summarizing the effects of the most severe grid faults on the rotor-side converter to overcome the most severe faults are provided.
eng
Copyright © 2014 Elsevier Ltd. All rights reserved. CC0 1.0 Universal
Doubly-fed induction generator (DFIG)
Fault clearing
Fault ride-through capability
Rotor-side converter
Symmetrical voltage sag
Unsymmetrical voltage sag
Detailed study of DFIG-based wind turbines to overcome the most severe grid faults
info:eu-repo/semantics/article
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