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A doubly fed electric machines, doubly fed induction generator (DFIG), or slip-ring generator is an electric motor or electric generator where both the field magnet windings and armature windings are separately connected to equipment outside the machine.
By feeding adjustable-frequency AC power to the field windings, the magnetic field can be made to rotate, allowing variation in motor or generator speed. This is useful, for instance, for generators used in wind turbines. Additionally, DFIG-based wind turbines offer the ability to control active and reactive power.

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