Discussion
A doubly fed induction generator in a wind turbine uses
Answer: B
Correct answer: a converter in the rotor circuit rated for the slip power
That is the whole point of the arrangement. With the stator connected directly to the grid and only the slip power passing through the rotor converter, a machine operating within about plus or minus 30 per cent of synchronous speed needs a converter rated at roughly 30 per cent of the machine output. The saving in converter cost and losses is what made the doubly fed generator the dominant wind turbine topology for many years.
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