Superconducting Medium Voltage DC Transmission: Architecture, Protection, and Simulation Insights

To cope with the transfer need of GWs level wind power to continental grid, the current solution is to use HVDC systems with the tendency to increase the DC voltage typically to 320 kV or 525 kV and employ an XLPE HVDC cable. The trend to operate at higher voltage levels is dictated by the converter technologies, typically using IGBT semi-conductors, and by the XLPE copper cable technologies. As a result, increasing the transmitted power generally requires increasing the voltage. Another option to overcome current limitations is to parallel semiconductor devices at different levels to increase the rated current. The same approach applies to cables: multiple cables can be installed in parallel to enhance the total currentcarrying capacity. However, this solution significantly increases the…