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HIGH voltage power converters.

Discussion in 'Electronic Design' started by Ian Stirling, Apr 29, 2004.

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  1. Ian Stirling

    Ian Stirling Guest

    How do you go about converting 200KVDC at 1000 amps into AC?

    Is it as 'simple' as series/parallel bridge arrangement of 200*50 IGBT/fets,
    running at a few Khz?

    I suppose development work would involve serious projectile shielding,
    as well as the normal equipment.

    I suppose with several thousand devices in a converter, you'd have to
    take into account that failures may happen, and cope with them without
    shutting down.
     
  2. mike

    mike Guest

    There's some interesting stuff on bpa.gov.
    The constructed 800-kilovolt (kV) d-c line interconnects the northern
    converter station at Celilo, Oregon, with the Sylmar Terminal Station
    near Los Angeles, California.

    What's your application? I can't imagine anyone with access to that
    kind of power wouldn't already be in the power transmission business.
    mike

    --
    Return address is VALID.
    Bunch of stuff For Sale and Wanted at the link below.
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  3. Ian Stirling

    Ian Stirling Guest

    Idle curiosity.
    Not actually considering hooking up to the lines :)
     
  4. Search on abb.com for HVDC light...
     
  5. I learned of such a, nameless to protect the guilty, link blowing six SCR
    stack including fuses because of one of those Tantalum Capacitor Time Bombs
    that were popular in 1980's equipment going off in the ground-side trigger
    unit. '

    The person replacing the fuses got 1.5 Kg of Silver out of it for his
    "collection" (those fuses are BIG)!
     
  6. budgie

    budgie Guest

    Rotary (motor-alternator) converter?
     

  7. Even bigger motors (many MW) don't operate on voltages
    much above 20kV or so. You don't want arcs on the collector.

    Rene
     
  8. Terry Given

    Terry Given Guest

    Jos Arillaga at Canterbury University, NZ, has written numerous papers on
    (and built many) HV inverters. These are typically used to convert AC-DC and
    back again for HVDC links - necessary for long distance power transmission.
    Typically they use MANY series-connected "hockey-puck" (some of those are
    8-9" dia, 3-4" thick) SCR's or GTO's,m usually optically triggered
    (transmission line behaviour is an issue when your semiconductor stack is 3m
    high ;). Failure mode (unless excess energy flows, vaporising the part -
    quite common!) is short-circuit, so using N+M devices in series for N*Vrated
    volts allows up to M devices to fail before servicing is required. For
    Megavolt inverters these stacks are physically HUGE - I recall a picture of
    an indian MVDC link rectifier, it was an a4 page, and a man standing in
    front was about 1-2cm tall......so it was about a 5-6 storey building in
    size.

    Canterbury university has a 1.5MVDC psu for testing this sort of stuff - now
    THATS a cool toy.
     
  9. Terry Given

    Terry Given Guest

    early tants were shite, and the failure mode/behaviour wasnt well known -
    consequently lots of people operated them near their rated voltage, where
    lifetime is dramatically reduced. They have improved a lot, but they still
    dont stack up (usually cost wise) whenever I go to use them....
    Yeah, one of our tech's at PDL used to scavenge silver out of the "little"
    fuses we used in 20kW - 1MW drives......
     
  10. Terry Given

    Terry Given Guest

     
  11. Dave Cole

    Dave Cole Guest

    Or you could use 300 * 1000 Hp synchronized MG sets with hot-swappable
    backup/alternate/spares. Just imagine the auxiliary and cooling systems
    needed. Good sized building even w/o offices/maintenance/spare parts
    warehousing, etc. ;-)
    DC
     
  12. Pay a visit to the Aldington converter station in Kent, and they can show
    you how they convert 3 phase high voltage to 400KV ( at around 4000A)for
    export to France or back the other way and feed the national grid. They
    have this cavernous room with stacks of opto-isolated SCR bricks all driven
    from a small rack of electronics.

    Graham Holloway
     
  13. Ian Stirling

    Ian Stirling Guest

    Thanks everyone.
    It is a bit far, as I'm at the other end of the country.
     
  14. Tim Shoppa

    Tim Shoppa Guest

    But there *are* electrostatic motors. I've seen toy models, and
    scaling them up to a quarter-million horsepower is surely an
    "exercise left to the student".

    Tim.
     
  15. Terry Given

    Terry Given Guest

    LASCRs are the way to go - light activated SCRs. drive with fibre optics.
    have many more devices in series than required, when one fails it goes
    short-circuit so the whole thing keeps operating.

    Terry
     
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