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Question
Wound rotor induction generators are primarily used in wind turbines because they ______.
A.
Reduce the overall cost
B.
Make the turbine noiseless
C.
Increase the wind turbine size
D.
Allow variable speed operation
Answer ( Option D)

Allow variable speed operation

Solution

Wound Rotor Induction Generators in Wind Turbines
Definition:
  • Wound rotor induction generators (WRIGs) are a type of induction generator where the rotor windings are connected to external resistances through slip rings.
  • This configuration allows for control over the rotor circuit resistance, making WRIGs suitable for applications requiring variable speed operations, such as wind turbines.
Working Principle:
  • In a wound rotor induction generator, the stator windings are connected to the grid or load, while the rotor windings are connected to external resistances.
  • When the rotor turns, an electromotive force (EMF) is induced in the rotor windings due to the relative motion between the rotor and the rotating magnetic field produced by the stator.
  • By adjusting the external resistance, it is possible to control the rotor current and, consequently, the generator's output characteristics.

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