MVDC ring-cable approach for new DC distribution and restructured AC grids

This paper proposes a hybrid distribution grid concept, based on a MVDC (Medium Voltage DC)-ring-cable grid approach, which could substitute AC distribution transformers, enable new DC- and restructuring existing AC-grids. This paper is focused on an MVDC-ring-cable approach, integrated MVDC/LVDC-converter stages as well as DC loads, resting upon an overall concept, including grid planning and operation issues like in [1]-[8].