with　the　development　of　distribution　network　and　power　electronic　device,　it　is　increasingly　more　important　for　the　reliability　of　power　system　and　optimization　of　active　and　reactive　power　from　a　system　standpoint.　This　paper　proposed　a　novel　power　optimizer　based　on　solid　state　transformer　(SST),　which　could　substitute　for　static　synchronous　compensator　(STATCOM)　and　network　connector,　with　their　integrated　capability　of　active　power　transfer,　voltage　control,　and　reactive　power　compensation.　The　improvements　of　the　power　optimizer　are　as　follows.　First,　active　power　can　be　transferred　according　to　the　optimization　objective.　Second,　reactive　power　can　be　compensated　on　both　sides.　Third,　grid　voltage　with　constant　magnitude　and　frequency　could　be　supported　in　time　when　branch　network　voltage　breaks　down.　To　this　end,　our　simulation　studies　are　presented　to　show　that　this　power　optimizer　can　operate　normally.　To　conclude,　this　proposed　power　optimizer　has　a　great　prospect　for　development　and　application.