The　traditional　current-type　flexible　arc　suppression　method　fails　to　account　for　the　impact　of　line　voltage　drop,　resulting　in　residual　current　during　grounding　fault　suppression.　To　improve　fault　current　suppression　performance,　this　article　proposes　flexible　arc　suppression　method　using　cascaded　H-bridge　converters　with　adaptive　voltage　drop　compensation.　First,　the　theoretical　expression　for　a　novel　injection　current　arc　suppression　algorithm　is　derived,　incorporating　the　effects　of　line　voltage　drop.　Subsequently,　the　differences　between　the　newly　developed　algorithm　and　the　original　algorithm　for　zero-sequence　voltage　regulation　are　analyzed.　Building　on　these　differences,　an　injection　current　arc　suppression　algorithm　with　adaptive　line　voltage　drop　is　constructed,　enabling　the　realization　of　zero　residual　currents　under　varying　ground　fault　conditions.　Furthermore,　to　address　the　impact　of　variations　in　the　equivalent　load　impedance　of　the　cascaded　H-bridge　converter　on　the　stability　of　the　control　system,　this　article　proposes　a　controller　design　method　that　considers　changes　in　grounding　fault　parameters,　ensuring　stable　current　output　from　the　cascaded　H-bridge　converters.　Finally,　the　correctness　and　feasibility　of　the　proposed　method　are　validated　through　PSCAD/EMTDC　simulations　and　physical　experiments.　©　2013　IEEE.