HVDC lines are commonly used for long-distance power transmission, since they require fewer conductors and incur less power loss than equivalent AC lines. HVDC also allows power transmission between AC transmission systems that are not synchronized. Since the power flow through an HVDC link can be controlled independently of the phase angle between source and load, it can stabilize a network against disturbances due to rapid changes in power. HVDC also allows the transfer of power between grid systems running at different frequencies, such as 50 and 60 Hz. This improves the stability and economy of each grid, by allowing the exchange of power between previously incompatible networks.
400kv DC lines to the rescue!
Expensive though…
Why just 400 kV?
At least Ukraine has several 750 kV power lines. Decreases the energy loss quite a bit!
Why DC? I’ve always been taught AC was better for long distances. What am I missing?
Solar produces DC, presumably the even higher voltage is preferable to the conversion losses.
From what I remember you get pretty close to AC mid-conversion anyway, but I looked it up and there are some other reasons to use DC:
From [https://en.wikipedia.org/wiki/High-voltage_direct_current]:
I just know that was the future french/european plan some 15 years ago.