The　operation　of　active　power　filter　requires　that　the　DC-link　capacitor　voltage　is　pumped　up　reliably　without　current　inrush.　In　this　paper,　a　smooth　and　reliable,　or　soft　start-up　scheme　for　DC-link　capacitor　voltage　pumping　is　proposed,　by　inserting　a　resistor　in　series　with　the　inductor　of　LCL-Filter　on　the　grid　side.　The　resistor　serves　to　limit　the　electric　current,　and　at　the　same　time　improve　the　control　system　characteristics.　The　system　model　with　the　resistor　in　circuit　is　analyzed,　and　simulation　and　experimental　results　are　provided　to　demonstrate　the　feasibility　of　the　proposed　scheme.　©　2013　IEEE.