In　the　medium-　and　high-power　grid-connected　photovoltaic　systems,　the　controller　bandwidth　is　constrained　due　to　the　low　switching　frequency.　This　issue　limits　the　resonant　frequency　of　the　traditional　proportional　multiresonant　(PMR)　controller　and　then　makes　it　difficult　to　suppress　the　main　low-frequency　harmonics　in　the　grid-connected　current.　In　addition,　it　is　difficult　for　PMR　to　maintain　good　performance　under　severe　operating　conditions,　such　as　the　grid　voltage　containing　the　resonant-frequency　harmonic　and　the　grid　voltage　sagging.　Based　on　the　abovementioned　practical　problems　and　on-site　requirements,　a　novel　first-order　active-disturbance-rejection　active-damping　control　strategy　based　on　the　inverter-side-current　feedback　(ICF-ADRC-AD)　for　the　LCL　grid-connected　inverter　is　proposed　in　this　article.　The　standard　form　of　the　system　block　diagram　is　deduced,　and　the　stability　and　immunity　of　the　system　are　analyzed.　Finally,　the　effectiveness　and　superiority　of　the　proposed　control　strategy　under　different　operating　conditions　are　verified　by　simulation　and　experiment.　The　control　strategy　proposed　in　this　article　improves　the　suppression　effect　of　low-frequency　total　harmonic　and　resonance　and　also　improves　the　stability　and　immunity　of　the　system.　©　2013　IEEE.