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Ridethrough of wind turbines with doubly-fed induction generator during a voltage dip

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2 Author(s)
Morren, Johan ; Electr. Power Process. Group, Delft Univ. of Technol., Netherlands ; de Haan, S.W.H.

In this paper, a solution is described that makes it possible for wind turbines using doubly-fed induction generators to stay connected to the grid during grid faults. The key of the solution is to limit the high current in the rotor in order to protect the converter and to provide a bypass for this current via a set of resistors that are connected to the rotor windings. With these resistors, it is possible to ride through grid faults without disconnecting the turbine from the grid. Because the generator and converter stay connected, the synchronism of operation remains established during and after the fault and normal operation can be continued immediately after the fault has been cleared. An additional feature is that reactive power can be supplied to the grid during long dips in order to facilitate voltage restoration. A control strategy has been developed that takes care of the transition back to normal operation. Without special control action, large transients would occur.

Published in:

Energy Conversion, IEEE Transactions on  (Volume:20 ,  Issue: 2 )

Date of Publication:

June 2005

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