Aiming　at　the　problem　of　the　existing　arc　suppression　methods　that　it　is　difficult　to　suppress　intermittent　grounding　arcs,　there　is　a　risk　of　resonance　when　the　device　exits,　and　the　capacity　of　the　equipment　is　limited.　This　paper　proposes　an　active　voltage　arc　suppression　method　based　on　cascaded　H-bridge　converters.　The　fault　phase　voltage　will　be　reduced　to　zero　by　using　the　active　voltage　arc　suppression　method　to　control　the　multi-level　converter　to　output　a　suitable　voltage　value.　The　output　voltage　value　of　the　device　is　gradually　reduced　to　zero　when　it　exits,　which　provides　a　release　loop　for　the　capacitor　charge.　The　principle　and　advantages　of　active　voltage　arc　suppression　will　be　discussed　in　this　paper.　At　the　same　time,　the　principle　on　the　suppression　of　fault　current　transient　components　will　be　analyzed.　Finally,　the　theoretical　analysis　is　simulated　and　verified　by　PSCAD/EMTDC.　The　simulation　results　show　that　the　proposed　arc　suppression　method　can　effectively　suppress　arc　overvoltage　without　the　risk　of　resonance.　©　2021　IEEE.