With　the　grounding　branch　set　in　the　middle　point　of　the　capacitors　on　DC　side　of　the　input　converter　of　the　power　electronic　transformer,　and　combining　with　the　multivariable　decoupling　control　under　αβ0　coordinate　system,　the　integrated　arc　suppression　method　for　single-phase　grounding　fault　in　distribution　network　is　proposed,　which　has　the　functions　of　distribution　network　asymmetry　parameter　compensation,　single-phase　grounding　fault　phase　selection　and　adaptive　arc　suppression　based　on　0　axis　voltage　regulation,　and　the　function　of　source-side　power　balance　based　on　α　axis　and　β　axis　voltage　regulation.　Under　the　normal　operation　of　distribution　network,　the　neutral　point　potential　deviation　caused　by　the　asymmetry　of　distribution　network　parameters　to　ground　is　monitored　in　real　time,　and　the　compensation　current　is　calculated　according　to　the　deviation　value　and　injected　into　distribution　network　to　eliminate　the　neutral　point　potential　deviation.　When　the　single-phase　grounding　fault　occurs　in　distribution　network,　the　amplitude　and　angle　relationship　between　zero-sequence　voltage　and　three-phase　voltage　are　compared　to　recognize　the　fault　phase.　The　amplitude　of　zero-sequence　voltage　is　taken　as　the　switching　condition　of　adaptive　arc　suppression.　The　power　oscillation　caused　by　load　switching　or　fault　is　suppressed　by　real-time　compensation　for　source-side　power.　Simulative　results　by　MATLAB/Simulink　validate　the　feasibility　and　effectiveness　of　the　proposed　integrated　arc　suppression　method.　©　2022,　Electric　Power　Automation　Equipment　Press.　All　right　reserved.