In　order　to　solve　the　problem　of　insufficient　economy　and　practicability　of　traditional　flexible　current　limiting　device　in　DC　grid，a　modular　current　limiting　inductance　structure　and　input　scheme　are　proposed　in　this　study　as　a　novel　form　of　DC　flexible　current　limiting　device.　A　corresponding　control　design　strategy　is　suggested　based　on　this　structure.　The　proposed　structure　enhances　the　fault　tolerance　rate　of　the　flexible　current　limiting　device，improves　its　economy，and　increases　the　speed　and　efficacy　of　fault　current　suppression.　It　achieves　quick　isolation　of　permanent　faults　in　the　DC　line　and　enables　self-healing　of　transient　faults　without　the　need　for　circuit　breaker　activation.　To　further　confirm　the　efficacy　of　the　proposed　device，a　software　platform　is　used　to　build　a　multi-terminal　flexible　DC　simulation　system.　This　system　investigates　both　permanent　and　transient　faults　in　the　DC　line.　©　2024　Science　Press.　All　rights　reserved.