Aiming at the problem of poor robustness of three-phase grid-connected inverter under traditional PI control, this paper first establishes a port-controlled Hamiltonian with dissipation model of three-phase two-level converter based on LCL filter, and then establishes the PCHD model adopts the passive control method of interconnection and damping configuration, and designs the passive controller. The stability of the system is verified by the second method of Lyapulov, and fuzzy control is adopted to strengthen the control ability of the DC side voltage. Finally, a passive simulation model based on fuzzy control is built in Matlab/Simulink, which verifies the robustness and effectiveness of the control strategy.