To　overcome　the　drawbacks　of　poor　robustness　of　traditional　model　predictive　control　parameters　and　large　output　current　ripple,　a　visual　three-vector　model-free　predictive　control　strategy　for　three-phase　three-level　inverters　is　presented.　First,　the　sliding　mode　observer　is　used　to　estimate　the　lumped　parameters　of　the　system,　and　the　reference　voltage　vector　is　obtained　using　deadbeat　control.　This　process　does　not　require　any　system　parameters　and　improves　the　robustness　of　the　control　strategy　parameters.　Second,　a　three-vector　combination　consisting　of　redundant　vectors　is　applied　during　each　sampling　period　to　reduce　the　output　current　ripple　and　achieve　capacitive　voltage　balancing.　A　new　visual　analysis　method　is　presented,　and　the　effectiveness　of　the　simplified　three-vector　optimization　method　is　proved　in　theory.　The　experimental　results　show　that　the　proposed　strategy　can　make　the　grid-connected　current　of　NPC　three-level　inverters　have　a　lower　total　harmonic　distortion　rate　when　the　model　parameters　are　mismatched.　This　enhances　the　parameter　robustness　of　the　model　predictive　control.　©　2023　Power　System　Protection　and　Control　Press.　All　rights　reserved.