Harmonic Suppression Strategy Of Grid-connected Current Based On Energy-shaping Control

This paper examines the control principle and limitations of traditional droop control method based harmonic suppression of grid-connected current. Subsequently, an innovative harmonic suppression method of grid-connected current for voltage-controlled inverter has been presented. The grid-connected inverter model is transposed to the port-controlled Hamiltonian model, and the grid-connected controller is constructed on the energy-shaping control theory. This approach significantly simplifies the structure of the grid-connected controller and manages parameter quantity. Based on these findings, the effectiveness of the proposed harmonic suppression method in injected grid current is verified under various operating conditions via an experimental platform for the inverter, which employs the Danfoss inverter and RT Box controller.