Abstract: The reasonable controller design scheme is crucial to improve the harmonic suppression capability of the injected grid current. The grid-connected controller of traditional droop-controlled inverter has complex structure and many control parameters, which is not conducive to practical application. Thus, a novel harmonic suppression scheme of grid current for the voltage-type control inverter is proposed in this paper, which converts the grid-connected inverter model to the port-controlled Hamiltonian model and the grid-connected controller is designed based on the energy-shaping control theory, with a result of a simplified control structure of controller and number of control parameters. Finally, with the digitization of the control method by RT Box controller, the effectiveness of the proposed harmonic suppression scheme is verified under different experimental environment by the inverter experimental platform based on Danfoss inverter.