Title :
Design specifications for series connected power transformer in DFIG driven wind turbines
Author_Institution :
CERN, Eur. Organ. for Nucl. Res., Geneva, Switzerland
Abstract :
This paper presents some topological solutions for the connection to the grid of a wind turbine using a DFIG, in order to increase the reliability of the gearbox. The so called crowbar system is studied to demonstrate its contribution to the gearbox mechanical stress. Analytical models are used to present the advantages of inserting a series voltage to the DFIG stator during voltage dips in order to decrease the oscillating mechanical torque applied to the gearbox. A global approach is used to propose the specifications of such kind of transformer.
Keywords :
asynchronous generators; gears; power grids; power transformers; reliability; stators; torque; wind turbines; DFIG driven wind turbines; DFIG stator; crowbar system; doubly-fed induction generator; gearbox mechanical stress; gearbox reliability; mechanical torque; series connected power transformer; voltage dips; wind turbine grid; Circuit faults; Rotors; Stator windings; Torque; Voltage fluctuations; Wind turbines; Doubly-Fed Induction Generator (DFIG); Gearbox reliability; Power transformer; short-circuit;
Conference_Titel :
Environment and Electrical Engineering (EEEIC), 2011 10th International Conference on
Conference_Location :
Rome
Print_ISBN :
978-1-4244-8779-0
DOI :
10.1109/EEEIC.2011.5874680
