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18 pulse

Discussion in 'Electronic Design' started by Bob LaFrance, Jul 28, 2003.

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  1. Bob LaFrance

    Bob LaFrance Guest

    I need to model 18 pulse rectifier system. I already have 3 of the
    vectors, 0, 120, 240. How do I create the remaining vectors so that
    they mimic the manner in which an 18 pulse transformer will be wound?

  2. Jim Meyer

    Jim Meyer Guest

    Put center-taps on the phases you already have. That way you can
    get phases 180 degrees from the first ones. 0, 60, 120, 180, 240, and
    300. This is a 6 pulse system.

    If the first transformer was delta wound, add another with wye
    windings or vice-versa. That will get you phases 30 degrees off from
    the first winding. That will give you 12 pulses.

    To get 18 pulses, start with the 6 pulse system. Add inductors
    tapped at 1/3 and 2/3 between adjacent phases (0 and 60 for instance).
    The taps will give you 10 degree phases intermediate to the phases on
    the ends of the inductor.


  3. John Larkin

    John Larkin Guest

    You can make any phase angle from vector sums of what you have, using
    resistive mixers and VCVS elements... that's just trig. The tricky
    part, from a modeling standpoint, will be to poke in the proper source
    impedances to mimic the real transformer. Maybe the tranny
    manufacturer can suggest some values.

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