readiescards Posted September 20, 2016 Share Posted September 20, 2016 For the various electric supply cables coming into Britain from Denmark & Norway, why are they using HVDC and not HVAC? (Which I thought was supposed to be superior) Link to comment Share on other sites More sharing options...
readiescards Posted September 20, 2016 Author Share Posted September 20, 2016 Oops should have looked harder: Quote Why DC? Viking Link would connect two High Voltage AC electricity systems separated by the North Sea using High Voltage Direct Current (HVDC) HVDC allows efficient transportation of electricity over large distances and in particular for submarine applications. It is also highly controllable and brings operational benefits to both transmission systems. from http://viking-link.com/your-questions/ Link to comment Share on other sites More sharing options...
readiescards Posted September 20, 2016 Author Share Posted September 20, 2016 Main reason for asking is that one of the potential routes is pretty much next to/under my house! Link to comment Share on other sites More sharing options...
Nickfromwales Posted September 20, 2016 Share Posted September 20, 2016 Set of jump leads, a bit of digging, and violá......off grid with as much free juice as you want . 1 Link to comment Share on other sites More sharing options...
ProDave Posted September 20, 2016 Share Posted September 20, 2016 I thought they used a DC interconnect between countries on different frequencies (50Hz / 60 Hz) I would love to know how they convert the dc back to ac at the far end, that's one F big inverter? Perhaps it also saves countries on the "same" frequency all being phased together? After all you can see the argument as to who is going to be the master to set the phase and frequency. 1 Link to comment Share on other sites More sharing options...
PeterW Posted September 20, 2016 Share Posted September 20, 2016 19 minutes ago, ProDave said: I would love to know how they convert the dc back to ac at the far end, that's one F big inverter? Yep pretty much ..! Various technologies that ranged from rotary inverters in the 70's to "active neutral point clamped converters" now that are used for stuff such as offshore wind farms. Did some work on a project that was looking to include HVDC a while back and the stuff they were talking about just blew my mind ! Link to comment Share on other sites More sharing options...
TerryE Posted September 20, 2016 Share Posted September 20, 2016 (edited) In a word: inductance. Piping AC in a submarine cable has horrendous power losses. DC doesn't; just the basic I²R. All of the AC <-> DC is solid state these days. The technology is amazing. But even for long distance overland power distribution, HVDC is starting to have more net advantages. Edited September 20, 2016 by TerryE 1 Link to comment Share on other sites More sharing options...
Temp Posted September 22, 2016 Share Posted September 22, 2016 Advantages.. http://www.ustudy.in/node/3601 Lower losses. HVDC can carry more power per conductor No need for the ends to be in phase/synchronised so may improve system stability. DC needs inverters to convert the AC to DC and back but these can also be used to provide better control over the amount of power flowing = Improved stability. DC better for interconnects (eg point A to Point B only). AC better if you want to tap off at lots of sites along the way. 1 Link to comment Share on other sites More sharing options...
readiescards Posted September 22, 2016 Author Share Posted September 22, 2016 And I suspose there is no chance of taping into the electric field effect if DC - since if it goes very near my house like this map shows that would be very helpful! Link to comment Share on other sites More sharing options...
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