As　the　second　part　of　two　series　paper,　the　protection　scheme　is　proposed.　First　of　all　theoretical　analysis　and　threshold　calculation　methods　are　introduced.　Aiming　to　the　problem　that　relay　needs　to　send　alert　signal　instead　of　trip　signal　in　non-effectively　grounded　system　when　single　pole　to　ground　fault　occurs,　a　fault　type　identification　method　is　introduced　based　on　the　ratio　of　absolute　values　of　two　poles　voltage　derivatives.　Then　1　mode　voltage　based　protection　scheme　is　developed　and　the　feasibility　of　design　of　criterion　based　on　pole　voltages,　impact　of　sampling　frequency,　fault　types,　resistance　and　branch　on　the　proposed　criterion　are　discussed　comprehensively.　MMC　based　two-terminal　and　radial　and　VSC　based　four-terminal　dc　distribution　systems　are　simulated　in　PSCAD.　Relay　behaviors　are　tested　in　three　systems　under　different　locations,　resistances　and　types　of　faults.　Results　show　that　the　proposed　methods　can　be　applied　to　both　MMC　and　VSC　based　dc　distribution　systems　and　are　immune　to　the　fault　type,　fault　location　and　fault　resistance.