Objective Conventional grid-connected inverters often employ L- or LC-type filters which require relatively large passive components to meet grid-current harmonic limits. To address this issue while maintaining cost-effectiveness and good grid-connected current quality this paper proposes a two-stage grid-connected inverter based on an LCL filter with a time-sharing composite control strategy. Methods The proposed strategy divided system operation into Buck mode and Boost mode. In Buck mode the grid-connected current was selected as the feedback variable and a PI controller performed current regulation. Active equivalent damping was introduced to suppress resonance peaks from the LCL filter. In Boost mode inductor current from the front-stage chopper circuit was used as the feedback variable. A compensation network together with a PR controller carried out regulation with a notch filter used to suppress resonance peaks. Results S th im e u c l o a n ti t o ro n l r s e y s s u te lt m s . in W di i c t a h t o e u d t t s h u a p t p t r h e e ssi L o C n L t f h il e te s r e i p n e tr a o k d s u i c n e c d re o a b s v e i d ou h s ar r m es o o n n i a c n s c i e n p th e e ak g s ri i d n c t u h r e re o n p t en an -l d oo c p ou fr ld eq e u v e e n n cy ca r u e s s e po s n y s s e te o m f instability. Compared with LC filters the LCL filter allowed further reduction in inductor parameters while still meeting g p r r i o d po c s u e r d ren c t on h t a ro rm l o s n tr ic ate s g ta y nd a a c r h d i s e ve w s hi s c t h abl h e elp g e ri d d m c i o n n im ne iz c e tio s n yst i e n m b s o i t z h e. B C u o ck ncl a u n s d ion Bo S o i s m t ul m in o k de s s im a u n la d tio s n a s tis v fi e e r s ify h t a h r a m t o t n h i e c r ti e m q e u - ir s e h m ar e i n n t g s c f o o m r g p r o i s d ite cu c r o re n n tr t o . l T st h r i a s te s g tu ie d s y fo p r ro g v r i i d d e - s co u n s n e e fu ct l e g d u i i n d v a e n r c t e er f s o . r suppressing resonance in LCL filters and designing