DocumentCode :
3062820
Title :
Transient stability margin of variable versus fixed speed wind systems in electrical grids
Author :
Nunes, M.V.A. ; Bezerra, U.H. ; Zürn, H.H.
Author_Institution :
Univ. Fed. de Santa Catarina, Florianopolis, Brazil
Volume :
3
fYear :
2003
fDate :
23-26 June 2003
Abstract :
For networks with large scale integration of wind farms this paper demonstrates a significant difference between the transient behavior of variable speed wind systems that adopt doubly fed induction generators with a four quadrant ac-to-ac converter connected to the rotor windings (DFIG) and a fixed speed wind system, where the conventional cage induction generator is used. The reason for this difference is explained, and it is shown that the phenomenon is due to the ability of the two dedicated rotor current regulators of the DFIG to control the electrical torque and reactive power quickly and accurately. This difference is clearly observed after a severe fault (short circuit) occurrence. It will be demonstrated that the adjustable speed generator (DFIG) enhances system stability in power networks.
Keywords :
AC-AC power convertors; asynchronous generators; electric current control; power generation control; power system interconnection; power system transient stability; reactive power control; rotors; torque control; wind power plants; adjustable speed generator; doubly fed induction generators; electrical grids; electrical torque control; fixed speed wind systems; large scale integration; quadrant ac-to-ac converter; reactive power control; rotor current regulators; rotor windings; system stability; transient stability margin; variable speed wind systems; Circuit faults; Induction generators; Large scale integration; Reactive power control; Regulators; Rotors; Stability; Torque control; Wind farms; Wind speed;
fLanguage :
English
Publisher :
ieee
Conference_Titel :
Power Tech Conference Proceedings, 2003 IEEE Bologna
Print_ISBN :
0-7803-7967-5
Type :
conf
DOI :
10.1109/PTC.2003.1304460
Filename :
1304460
Link To Document :
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