On chain-link based multi-port converters able to connect HVDC and MVDC to AC transmission network

Multi-port converters may offer an attractive solution to contribute in achieving a more compact, flexible and efficient network. Recently, in literature, a few converter topologies have been proposed to inter-connect high-power and high-voltage systems. Most of converter topologies are based on chain-link or modular concept, which is considered a very beneficial way to scale different ranges of voltages and current keeping a high level of reliability, feasibility and power quality. The aim of this paper is to pro-vide, first, a qualitative description of a few selected multi-port converter configurations (non-isolated and fully isolated arrangements) able to interconnect HVDC, MVDC to HVAC systems. And, second, to present a qualitative comparison among cost and footprint of each topology. Also, the paper introduces some practical implications to take into account abnormal conditions e.g fault and port disconnections for such converters.