The LCL-type grid-connected inverter with inverter-side feedback is widely used in practical applications. However

the system stability can be affected by the digital control delay which changes the system phase-frequency characteristics. Therefore

this paper proposes a phase lead compensation based on an adaptive notch filter (ANF). Firstly

the phase lag caused by the control delay is compensated by the phase lead of the notch filter

which avoids the system phase crossing -180° at the resonance frequency; thus

the system stability and its robustness to weak grids are improved. Secondly

the system resonance frequency is estimated by the ANF algorithm

and the notch frequency is dynamically adjusted according to the estimated value; hence

the stability range of the resonance frequency is extended

which enhances the adaptability of the system to LCL parameters variations. Finally

the proposed method is verified by experiments

and the results show that the grid-connected inverter based on the ANF scheme has good stability. Moreover

compared with the traditional notch scheme

the proposed scheme has better robustness to the grid impedance and the LCL parameters variations; thus

it is more conducive to the control of LCL-type grid-connected inverters in weak grids.