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Behaviour of the doubly fed induction generator exposed to unsymmetrical voltage sags

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10.1049/iet-epa.2011.0226
 
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hdl:2117/16812

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Rolán Blanco, AlejandroMés informacióMés informacióMés informació
Córcoles López, FelipeMés informacióMés informacióMés informació
Pedra Durán, JoaquimMés informacióMés informacióMés informació
Document typeArticle
Defense date2012-09
Rights accessRestricted access - publisher's policy
All rights reserved. This work is protected by the corresponding intellectual and industrial property rights. Without prejudice to any existing legal exemptions, reproduction, distribution, public communication or transformation of this work are prohibited without permission of the copyright holder
Abstract
This study analyses the dynamic behaviour of the doubly fed induction generator exposed to unsymmetrical voltage sags, providing insights into wind turbine fault ride-through capability. The sags are assumed to be caused by faults. An analytical approach assuming that the rotor-side converter can keep constant the rotor current in the synchronous reference frame during the event is used. The voltage limit of the rotor-side converter is also considered in order to determine the situations where the rotor current can be controlled. The effects of sags on grid-connected equipments depend on the sag characteristics (duration and depth), but also on the fault clearing process. In this process, the fault is not cleared instantaneously, as in the case of abrupt sags (which is the usual approach in the literature), but in the successive natural fault-current zeros, leading to a voltage recovery in several steps known as discrete sags. The effects of both abrupt and discrete sags on the doubly fed induction generator behaviour are compared. This comparison reveals that the discrete clearing process smoothes the sag effects on the generator.
CitationRolan, A.; Corcoles, F.; Pedra, J. Behaviour of the doubly fed induction generator exposed to unsymmetrical voltage sags. "IET electric power applications", Setembre 2012, vol. 6, núm. 8, p. 561-574. 
URIhttp://hdl.handle.net/2117/16812
DOI10.1049/iet-epa.2011.0226
ISSN1751-8660
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