Two　cascaded　H-bridge　converters　(CHBC)　are　proposed　to　regulate　the　zero-sequence　reactive　current　of　distribution　networks　flexibly　to　realize　the　online　ice-melting　of　ice-covered　lines　without　power　outages.　The　two　CHBCs　are　connected　in　series　to　the　grounding　transformer　at　the　head　and　end　of　the　ice-covered　lines.　The　zero-sequence　voltage　of　the　distribution　networks　is　regulated　by　the　end　CHBC　within　the　permissible　range　of　insulation,　and　the　resulting　zero-sequence　capacitive　current　to　ground　flows　through　the　three-phase　ice-covered　conductors　as　ice-melting　current,　which　realizes　a　better　effect　than　the　single-phase　short-circuit　current　ice-melting.　By　regulating　the　capacitance　current　to　the　ground　of　the　distribution　networks　through　the　head　CHBC,　the　size　of　the　ice-melting　current　can　be　adjusted　arbitrarily.　The　proposed　method　does　not　require　a　single-phase　grounding　short　circuit　and　can　simultaneously　accurately　regulate　the　ice-melting　current　to　melt　ice　in　three-phase　lines.　CHBCs　only　have　reactive　interaction　with　the　distribution　networks,　saving　the　capacity　of　DC　sources,　and　the　sum　of　power　interactions　is　zero,　which　does　not　affect　the　normal　supply　voltage　of　the　distribution　networks,　and　there　is　no　need　for　power　outages　for　the　entire　network　loads.　The　simulation　and　experimental　results　verify　the　feasibility　and　effectiveness　of　the　proposed　method　and　control　scheme.　©　2024　Power　System　Technology　Press.　All　rights　reserved.