Crowbar System in Doubly Fed Induction Wind Generators
In the last 15 years, the use of doubly fed induction machines in modern variable-speed wind turbines has increased rapidly. This development has been driven by the cost reduction as well as the low-loss generation of Insulated Gate Bipolar Transistors (IGBT). According to new grid code requirements, wind turbines must remain connected to the grid during grid disturbances. Moreover, they must also contribute to voltage support during and after grid faults. The crowbar system is essential to avoid the disconnection of the doubly fed induction wind generators from the network during faults. The insertion of the crowbar in the rotor circuits for a short period of time enables a more efficient terminal voltage control. As a general rule, the activation and the deactivation of the crowbar system is based only on the DC-link voltage level of the back-to-back converters. In this context, the authors discuss the critical rotor speed to analyze the instability of doubly fed induction generators during grid faults.
Year of publication: |
2010
|
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Authors: | Salles, MaurÃcio B. C. ; Hameyer, Kay ; Cardoso, José R. ; Grilo, Ahda. P. ; Rahmann, Claudia |
Published in: |
Energies. - MDPI, Open Access Journal, ISSN 1996-1073. - Vol. 3.2010, 4, p. 738-753
|
Publisher: |
MDPI, Open Access Journal |
Subject: | crowbar system | doubly fed induction generator | induction generator | reactive power control | wind power generation |
Saved in:
freely available
Extent: | application/pdf text/html |
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Type of publication: | Article |
Classification: | Q - Agricultural and Natural Resource Economics ; Q0 - Agricultural and Natural Resource Economics. General ; Q4 - Energy ; Q40 - Energy. General ; Q41 - Demand and Supply ; Q42 - Alternative Energy Sources ; Q43 - Energy and the Macroeconomy ; q47 ; Q48 - Government Policy ; Q49 - Energy. Other |
Source: |
Persistent link: https://www.econbiz.de/10011030829
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