Discussion
A grid-connected induction generator is used to generate electricity from a wind turbine. Which one of the following statements is true while the generator is feeding power to the grid?
Answer: C
While feeding power to the grid, the slip of the induction generator is less than zero.
Slip is \(s = (N_{s}-N_{r})/N_{s}\). An induction machine acts as a generator only when the rotor is driven faster than the synchronous speed set by the grid frequency, so \(N_{r} \gt N_{s}\) and the slip is negative, typically a few per cent.
Zero slip means the rotor turns at synchronous speed and no power is converted. Slip between 0 and 1 is motoring, slip of 1 is a stalled rotor, and slip greater than 1 means the rotor turns against the field, braking (plugging) rather than generating.
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