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DC-DC converter efficiency compared to transformers (for transmission)

Discussion in 'Electronic Basics' started by davidd31415, Dec 12, 2005.

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  1. davidd31415

    davidd31415 Guest

    Hi,

    I've been reading through posts regarding transmission lines and the
    pros & cons of using AC or DC but one thing I haven't found much of is
    a discussion on is the efficiency of converting DC voltages (stepping
    up or down). I realize using high voltage decreases power loss and
    that's why we started using transformers & AC back in 1895 at Niagara
    Power but I've also read a lot about DC transmission lines that are in
    use today, notably the Pacific lines.

    How does the efficiency of the DC to DC converters used by the power
    companies compare with transformers that would be handling simiilar
    amounts of power?

    I've read that interconnection and switching are other issues with DC
    transmission, could someone explain these, why DC has issues, why AC
    doesn't, and what might be done to make DC work? Also, are there any
    other serious disadvantages to using DC for transmission now days,
    aside from infrastructure changes?
     
  2. Figaro

    Figaro Guest

    | Hi,
    |
    | I've been reading through posts regarding transmission lines and the
    | pros & cons of using AC or DC but one thing I haven't found much of is
    | a discussion on is the efficiency of converting DC voltages (stepping
    | up or down). I realize using high voltage decreases power loss and
    | that's why we started using transformers & AC back in 1895 at Niagara
    | Power but I've also read a lot about DC transmission lines that are in
    | use today, notably the Pacific lines.
    |
    | How does the efficiency of the DC to DC converters used by the power
    | companies compare with transformers that would be handling simiilar
    | amounts of power?
    |
    | I've read that interconnection and switching are other issues with DC
    | transmission, could someone explain these, why DC has issues, why AC
    | doesn't, and what might be done to make DC work? Also, are there any
    | other serious disadvantages to using DC for transmission now days,
    | aside from infrastructure changes?


    Post this at: misc.industry.utilities.electric

    On the whole, the life-cycle cost (initial cost, operation, maintenance)
    of DC transmission is significantly higher than AC transmission.
    This is why it is only used when AC transmission becomes technically
    unfeasible; for example, very long lines such as the Pacific intertie,
    asynchronous transmission, excessive interconnection power angles.
     
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