The　capacity　of　the　converter　in　the　existing　flexible　arc　suppression　device　for　ground　faults　in　the　distribution　network　is　relatively　large,　resulting　in　a　high　investment　cost　for　the　arc　suppression　device　hinder　widespread　engineering　adoption.　The　phase　power　feed-in　arc　suppression　device　is　based　on　the　principle　of　voltage　arc　suppression,　which　can　control　the　fault　phase　voltage　close　to　zero　at　a　low　cost,　thereby　suppressing　the　fault　current　close　to　zero　and　realizing　ground　fault　arc　suppression.　It　is　easy　to　be　extended　to　engineering　applications,　but　its　arc　suppression　effect　is　greatly　affected　by　the　ground　fault　transition　resistance　and　line　impedance　voltage　drop.　The　compensation　effect　is　poor　when　there　is　a　low　resistance　ground　fault,　and　the　compensation　effect　is　not　good　when　there　is　a　ground　fault　at　the　end　of　the　line.　Therefore,　this　paper　proposes　a　hybrid　arc　suppression　device　with　a　phase　power　series　converter　structure,　which　combines　a　phase　power　feed-in　arc　suppression　device　and　a　cascaded　H-bridge　converter　arc　suppression　device　in　series,　thus　reducing　the　capacity　of　converter　and　achieving　fault　arc　suppression　at　a　lower　cost.　On　the　basis　of　analyzing　the　influence　of　transition　resistance　and　line　impedance　on　existing　arc　suppression　methods,　a　voltage　and　current　parallel　double　closed-loop　control　arc　suppression　method　taking　into　account　line　impedance　and　parameter　asymmetry　is　proposed　and　applied　to　the　proposed　hybrid　arc　suppression　device.　Its　arc　suppression　effect　is　less　affected　by　transition　resistance　and　line　impedance,　so　it　can　reliably　suppress　the　fault　current　close　to　zero　and　achieve　ground　fault　arc　suppression.　The　effectiveness　of　the　proposed　method　is　verified　through　simulation　and　experimentation.　©2025　Chin.Soc.for　Elec.Eng.