double-fed synchronous generator

Discussion in 'Homework Help' started by Cerkit, May 24, 2010.

  1. Cerkit

    Thread Starter Active Member

    Jan 4, 2009
    275
    3
    Hi. I am trying to understand the basic operation of the doubly-fed synchronous generator used for a wind turbine. All i understand is that the rotor windings are fed from a back-to-back inverter. Is that the main property of this machine. Or am I mixing things up?
     
  2. t_n_k

    AAC Fanatic!

    Mar 6, 2009
    5,448
    782
    If the rotor windings are energised via the inverter at a controlled slip frequency such that the stator output frequency is the same as the grid frequency you have a variable input speed drive generator with constant output frequency. This allows synchronous power generation back into the grid from a variable speed drive - such as one has with wind turbines.

    The inverter fed slip frequency is controlled according to the varying turbine speed.
     
  3. Cerkit

    Thread Starter Active Member

    Jan 4, 2009
    275
    3
    Nice. Great explanation. Thanks.
     
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