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This paper investigates the modeling and control of doubly fed induction generator (DFIG) and fixed speed induction generator (FSIG) based wind farms under unbalanced conditions. A DFIG model suitable for analyzing unbalanced operation is developed, and used to assess the impact of an unbalanced supply on DFIG and FSIG operation are illustrated. Network voltage unbalance can cause unequal heating...
This paper considers a coordinated control strategy for adjacent FSIG and DFIG based wind farms whereby the reactive power output of the DFIG is prioritised over real power after a fault on the network, in order to boost the FSIG terminal voltage and improve its fault ride through capability. The issue of protection for a DFIG based wind turbine during network fault is also considered. It is seen...
This paper describes the use of voltage source converter based HVDC transmission (VSC transmission) system for grid integration of large wind farms over long distance. The wind farms can be based on either doubly-fed induction generator (DFIG) or fixed speed induction generator (FSIG). The paper describes the operation principles and control strategies of the proposed system. Automatic power balancing...
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