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A doubly fed induction generator in a wind turbine is attractive because

  • A.it needs no gearbox between rotor and generator
  • B.its converter handles only the slip power
  • C.it requires no converter of any kind
  • D.it can be connected directly to the network at any speed

Answer: B

A converter of perhaps a third of the machine rating gives a useful speed range, which is a large saving on a multi-megawatt machine. Full converter arrangements have since gained ground because they ride through network faults more gracefully.

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