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Energies 2010, 3(4), 738-753; doi:10.3390/en3040738

Crowbar System in Doubly Fed Induction Wind Generators

2,* , 1
1 Laboratory of Applied Electromagnetism–LMAG, University of São Paulo, Brazil 2 Institute of Electrical Machines–IEM, RWTH Aachen University, Germany 3 Engineering, Modeling and Applied Social Science Center–Federal University of ABC, Brazil 4 Institute of Power Systems and Power Economics–IAEW, RWTH Aachen University, Germany
* Author to whom correspondence should be addressed.
Received: 3 February 2010 / Revised: 26 February 2010 / Accepted: 27 February 2010 / Published: 12 April 2010
(This article belongs to the Special Issue Wind Energy)
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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.
Keywords: crowbar system; doubly fed induction generator; induction generator; reactive power control; wind power generation crowbar system; doubly fed induction generator; induction generator; reactive power control; wind power generation
This is an open access article distributed under the Creative Commons Attribution License (CC BY 3.0).

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Salles, M.B.C.; Hameyer, K.; Cardoso, J.R.; Grilo, A.P.; Rahmann, C. Crowbar System in Doubly Fed Induction Wind Generators. Energies 2010, 3, 738-753.

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