The highest capacity sub sea transmission cables are DC now I think. There is an interconnect between Ireland and France that is DC if memory serves.
I think it's only efficient for the largest capacity lines tho
I think it's only efficient for the largest capacity lines tho
If I remember correctly that actually makes things much worse if you've operated at one potential for a considerable amount of time.
You could operate the cable at AC ~ 0.1Hz but your ability to actually transmit MWH would suck.
Whatever, the ground currents penetrate very deep into the earths crust thus equally effecting buried cables.
Its the difference between just shifting the frequency or phase on your local control clock at the substation, and trying to coordinate with another state/territory/nation's entire AC generation infrastructure to keep everything in phase.