Crowbar System in Doubly Fed Induction Wind Generators

Maurício B. C. Salles, Kay Hameyer, José R. Cardoso, Ahda. P. Grilo and Claudia Rahmann
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Maurício B. C. Salles: Laboratory of Applied Electromagnetism–LMAG, University of São Paulo, Brazil
Kay Hameyer: Institute of Electrical Machines–IEM, RWTH Aachen University, Germany
José R. Cardoso: Laboratory of Applied Electromagnetism–LMAG, University of São Paulo, Brazil
Ahda. P. Grilo: Engineering, Modeling and Applied Social Science Center–Federal University of ABC, Brazil
Claudia Rahmann: Institute of Power Systems and Power Economics–IAEW, RWTH Aachen University, Germany

Energies, 2010, vol. 3, issue 4, 1-16

Abstract: 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 (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2010
References: View complete reference list from CitEc
Citations: View citations in EconPapers (9)

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