The　complicated　operating　conditions　of　distribution　networks　may　be　prone　to　single-phase　grounding　(SPG)　fault.　Based　on　statistics,　SPG　faults　account　for　more　than　80%　of　all　fault　types　in　the　distribution　networks.　Arc　suppression　coil　can　typically　compensate　for　most　of　the　capacitive　fault　current　but　cannot　eliminate　the　fault　voltage,　and　the　residual　fault　current,　including　the　active　current,　is　still　high.　To　limit　fault　current　completely　and　eliminate　voltage　simultaneously,　a　cascaded　grid-connected　converter　(CGCC)　coupled　with　an　arc　suppression　coil　is　presented　in　this　paper.　However,　with　the　increase　of　nonlinear　loads,　the　transmission　lines　contain　a　large　amount　of　harmonic　current.　Thus,　the　CGCC　is　proposed　to　compensate　the　harmonic　current　simultaneously　by　controlling　its　d-axis　and　q-axis　output　components,　and　to　control　the　0-axis　output　component　for　arc　suppression,　and　the　controls　of　harmonic　compensation　and　arc　suppression　are　decoupled,　so　that　the　utilization　and　cost-effectiveness　are　improved.　©　2024　IEEE.