In　the　past　decade,　extensive　active　damping　solutions　based　on　state　variable　feedback　have　been　proposed　to　damp　LCL　resonance.　In　this　letter,　an　innovative　control　strategy,　which　can　achieve　overcurrent　protection,　injected　power　control,　and　active　damping　at　the　same　time,　is　proposed　with　the　inverter-side　current　feedback　only.　Moreover,　to　avoid　the　mathematical　limitations　when　solving　characteristic　roots　of　a　third-order　system,　the　damping-factor-based　design　method　is　proposed　for　the　first　time,　by　analyzing　its　equivalent　circuit.　The　optimal　damping　factor,　which　is　recommended　to　be　positive　and　as　large　as　possible,　is　searched　to　achieve　superior　resonance　suppression　effect.　Finally,　the　proposed　control　and　design　method　is　verified　by　experimental　results　and　shows　good　robustness　both　in　stiff　and　ultraweak　grid　conditions.