Influence of the variable-speed wind generators in transient stability margin of the conventional generators integrated in electrical grids

This work demonstrates that the integration of variable-speed wind systems with doubly fed induction generators (DFIG) and a four-quadrant AC-to-AC converter connected to the rotor windings increases the transient stability margin of the electrical grids, when compared with the case where the fixed...

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Bibliographic Details
Published in:IEEE transactions on energy conversion 2004-12, Vol.19 (4), p.692-701
Main Authors: Nunes, M.V.A., Lopes, J.A.P., Zurn, H.H., Bezerra, U.H., Almeida, R.G.
Format: Article
Language:English
Subjects:
Control systems
Decoupled control
doubly fed induction generator (DFIG) protection
electrical grids
fixed speed wind systems
Induction generators
Mathematical model
Mesh generation
Power generation
Power system dynamics
Power system modeling
Rotors
Stability
transient stability margin
variable-speed wind systems
Wind energy generation
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Summary:This work demonstrates that the integration of variable-speed wind systems with doubly fed induction generators (DFIG) and a four-quadrant AC-to-AC converter connected to the rotor windings increases the transient stability margin of the electrical grids, when compared with the case where the fixed speed wind systems with cage generators are used. It is due to the influence of the two dedicated rotor current regulators of the DFIG on the dynamic behavior of the other generators in the system. Besides, adequate models to represent the behavior of the DFIG in transient stability studies are presented. From the simulation results, some important conclusions can be extracted to guide the integration of the wind farms on weak or strong grids.
ISSN:0885-8969
1558-0059
DOI:10.1109/TEC.2004.832078