The　voltage　pumping-up　phenomenon　in　DC　side　is　analyzed　for　a　series　active　voltage　quality　regulator　in　the　paper.　In　order　to　avoid　DC　voltage　pumping-up,　a　phase　shift　compensation　approach　is　proposed,　and　the　relationships　among　source　overvoltage　ratio,　load　power　factor,　phase　shift　angle　and　injection　voltage　provided　by　inverter　are　presented.　Taking　a　series　active　voltage　quality　regulator　used　in　low　voltage　distribution　for　example,　the　parameters　aforementioned　are　calculated.　A　group　practical　design　curves　for　suppression　DC　voltage　pumping-up　with　phase　shift　control　algorithm　are　obtained.　Furthermore,　through　the　closed-loop　control　for　the　DC　side　voltage　in　the　series　active　voltage　quality　regulator,　a　phase　shift　implementation　algorithm　is　presented,　and　it　can　adjust　the　phase　of　the　load　reference　voltage　gradually　and　automatically　according　to　me　operational　conditions　of　grid　and　the　load.　The　practicability　and　effectiveness　are　verified　by　a　3　kW　single-phase　series　active　quality　voltage　regulator＇s　experimental　results,　and　the　performances　of　phase　shift　and　suppression　DC　voltage　pumping-up　are　very　good.