DC　distribution　network　is　the　basic　supporting　component　of　the　future　Energy　Internet.　A　variety　of　power　supplies,　load,　energy　storage　devices　can　be　integrated　to　DC　distribution　network　and　it　will　act　as　energy　management　unit　in　Energy　Internet.　Due　to　of　the　large　amount　of　DC　capacitors　contained　in　voltage　source　converters,　the　consumption　of　reactive　power　in　the　startup　process　needs　to　be　calculated　specifically.　This　paper　introduces　two　basic　charging　strategies,　and　the　numerical　expressions　of　reactive　power　in　different　charging　strategies　are　deduced.　The　current-limiting　resistance　will　affect　reactive　power　and　completion　time　of　charging　significantly.　Simulation　results　show　that　AC　voltage　will　be　affected　seriously　by　the　oscillation　of　reactive　power,　which　leads　to　amplitude　drop　and　waveform　distortion　during　mode　switching.