The　low　voltage　direct　current　(LVdc)　system　effectively　integrates　renewable　energy　sources　and　diverse　dc　loads.　It　eliminates　unnecessary　energy　conversion　steps　between　dc　distribution　units　and　ac　grids,　thereby　enhancing　energy　efficiency.　In　LVdc　systems,　voltage　source　converters　(VSCs)　serve　as　vital　interfaces　for　converting　energy　between　ac　and　dc　systems,　however,　their　capability　on　dc　fault　ride-through　is　usually　lacked.　Furthermore,　the　existing　dc　circuit　breakers　struggle　to　reliably　isolate　faults　before　VSCs　blocked,　thereby　compromising　VSC　safety.　To　address　these　issues,　this　article　introduces　a　novel　topology　self-adjusted　fault　current　limiter　(NSAFCL).　In　normal　operating　mode,　the　impedance　of　NSAFCL　is　controlled　in　a　parallel　state,　and　a　bias　power　with　adaptable　output　is　designed　to　bypass　NSAFCL,　minimizing　its　influence　during　normal　operation.　In　fault　mode,　the　impedance　of　NSAFCL　is　controlled　in　a　series　state,　and　a　current　limiting　resistor　is　introduced,　shaving　the　fault　current　and　maintaining　the　fault　voltage.　Finally,　the　simulation　and　experiment　are　conducted　to　verify　the　feasibility　of　NSAFCL,　and　results　demonstrate　that　compared　to　traditional　schemes,　the　proposed　NSAFCL　offers　extended　current　limitations,　prevents　VSC　blocking,　and　reduces　the　peak　fault　current　by　70%.　©　1986-2012　IEEE.