A　novel　arc-suppression　method　based　on　the　cascaded　H-bridge　converter　with　single　DC　source　is　proposed　to　solve　the　longstanding　problem　that　the　arc　caused　by　single-phase-to-earth　fault　in　distribution　network　is　difficult　to　extinguish　and　easy　to　reignite.　Three-phase　cascaded　H-bridge　converter　is　utilized　as　the　physical　carrier　of　the　arc-suppression　method.　The　single　DC　source　on　DC　side　can　compensate　the　energy　loss　in　arc-suppression　process　and　ensure　stable　operation　of　this　device.　Based　on　the　arc-suppression　device,　a　control　strategy　combined　with　quasi-proportional-resonant　(quasi-PR)　controller　and　model　predictive　control　is　presented.　Quasi-PR　controller　as　voltage　outer　loop　provides　the　reference　signal　for　current　inner　loop　in　order　to　limit　the　fault-phase　voltage;　model　predictive　control　as　the　current　inner　loop　controls　output　current　and　balances　the　DC-side　voltage　of　converter.　Moreover,　to　promote　transient　performance,　this　paper　proposes　a　slack-tight　strategy　based　on　parameter　adjustment　of　quasi-PR　controller.　Simulation　and　experimental　results　show　that　the　proposed　flexible　arc-suppression　method　has　excellent　transient　and　steady　performance,　able　to　suppress　fault-phase　voltage　effectively　and　prevent　fault　arc　reigniting.　©　2019,　Power　System　Technology　Press.　All　right　reserved.