Abstract: For LCL-type grid-connected distributed generation system, the single grid current feedback active damping（GCFAD） method with the high pass filter（HPF） can damp well the resonant peak only with a large resonant frequency offset, which is not conducive to the reliable operation. For this, the single current feedback was converted from the grid current to the inverter current, and the inverter current feedback resonance suppression（ICFRS） method without the additional sensor was proposed to reduce the resonance frequency offset effect. Considering the influence of the control delay and grid impedance, the boundary frequency range of the positive or negative resistance was derived in the interval of f_s/6, f_s/3) under the proposed ICFRS method, and the robust inverter current feedback resonance suppression（RICFRS） was further proposed to improve system stability by maintaining a positive virtual resistance regardless of the grid impedance variation. The control performance of the system was analyzed in detail, and the suitable control parameters were selected without complicated trial. Finally, simulation andexperimental results verified the validity of the proposed control method.