In　order　to　suppress　three　kinds　of　resonance　for　LCL　type　multi-inverter　parallel　system,　a　new　hybrid　control　algorithm　for　order　reduction　is　proposed.　The　resonance　suppression　strategy　is　based　on　the　hierarchical　control　structure　of　inverter,　and　combines　the　current　prediction　model　control　with　the　two-degree-of-freedom　control　principle.　The　current　inner-loop　control　layer　adopts　current　prediction　model　control　to　eliminate　its　PI　controller　and　PWM　regulator,　and　realize　the　unitization　of　the　current　inner-loop　transfer　function.　The　voltage　outer-loop　control　layer　adopts　the　principle　of　two-degree-of-freedom　control　to　construct　the　inverse　model　of　the　controlled　object,　and　realize　the　unitization　of　the　voltage　outer-loop　transfer　function.　Due　to　the　unitization　of　the　inner-　and　outer-loop　transfer　function　of　control　layer,　the　highest　order　difference　between　the　numerator　and　the　denominator　of　resonance　transfer　function　is　decreased,　so　that　there　is　no　resonance　peak　value　in　the　Bode　diagram　of　the　resonance　transfer　function.　Finally,　the　simulative　results　based　on　MATLAB/Simulink　indicate　that　when　facing　different　harmonic　sources,　the　proposed　strategies　can　ensure　that　the　total　harmonic　distortion　rate　of　grid-connected　current　is　less　than　4　%,　which　can　effectively　suppress　the　resonance　of　multi-inverter　parallel　system.　©　2021,　Electric　Power　Automation　Equipment　Press.　All　right　reserved.