A New Protection Scheme Using an AC/DC Converter for a LVDC Distribution System

As the number of direct current (DC) customers is currently expanding, and distribution lines are changing from alternative current (AC) to DC accordingly, DC distribution lines with a radial structure are also becoming longer. This paper includes an analysis of the characteristics of fault currents in LVDC systems, and proposes a protective coordination method, utilizing AC/DC converters and protection equipment when a fault occurs in direct current lines with radial structure, that has been effectively demonstrated in field verification tests.