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Grid Integration of Large DFIG-Based Wind Farms Using VSC Transmission

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3 Author(s)
Lie Xu ; Queen''s Univ. of Belfast, Belfast ; Liangzhong Yao ; Sasse, Christian

This paper describes the use of voltage source converter (VSC)-based HVDC transmission system (VSC transmission) technology for connecting large doubly fed induction generator (DFIG)-based wind farms over long distance. The operation principles of the proposed system are described, and new control strategies for normal and grid fault conditions are proposed. To obtain smooth operation, the wind farm side VSC (WFVSC) is controlled as an infinite voltage source that automatically absorbs power generated by the wind farm and maintains a stable local ac network. Fault ride through of the system during grid ac faults is achieved by ensuring automatic power balancing through frequency modulation using WFVSC and frequency control using DFIG. PSCAD/EMTDC simulations are presented to demonstrate robust performance during wind speed and power variations and to validate the fault ride through capability of the proposed system.

Published in:

Power Systems, IEEE Transactions on  (Volume:22 ,  Issue: 3 )

Date of Publication:

Aug. 2007

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