thanks a lots. With the keyword HVDC I could find some interesting wikipedia: https://en.wikipedia.org/wiki/High-voltage_direct_current https://en.wikipedia.org

thanks a lots. With the keyword HVDC I could find some interesting wikipedia: https://en.wikipedia.org/wiki/High-voltage_direct_current https://en.wikipedia.org/wiki/High-voltage_direct_current (I always sought that the entire European grid was synchronous it looks like it's not the case.)