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

D

davidd31415

Jan 1, 1970
0
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?
 
F

Figaro

Jan 1, 1970
0
| 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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