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Comparison of the response of doubly fed and fixed-speed induction generator wind turbines to changes in network frequency

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2 Author(s)
Ekanayake, J. ; Univ. of Peradeniya, Sri Lanka ; Jenkins, N.

Synchronous and fixed-speed induction generators release the kinetic energy of their rotating mass when the power system frequency is reduced. In the case of doubly fed induction generator (DFIG)-based wind turbines, their control system operates to apply a restraining torque to the rotor according to a predetermined curve with respect to the rotor speed. This control system is not based on the power system frequency and there is negligible contribution to the inertia of the power system. A DFIG control system was modified to introduce inertia response to the DFIG wind turbine. Simulations were used to show that with the proposed control system, the DFIG wind turbine can supply considerably greater kinetic energy than a fixed-speed wind turbine.

Published in:

Energy Conversion, IEEE Transactions on  (Volume:19 ,  Issue: 4 )