A Harmonic Suppression Method of H6 Topology Single Phase Inverter

The single phase H6 topology inverter has the advantages of simple structure, small common-mode leakage current, low current distortion rate and high security, which is very suitable for small distributed photovoltaic power generation system. In terms of suppressing the power grid harmonics of H6 topology photovoltaic inverter, there have been many studies both at home and abroad. For example, traditional PI control has simple algorithm and fast tracking speed, but poor steady-state performance. Repetitive control has good steady-state performance, but the tracking has one cycle lag. In this paper, the harmonic suppression design of voltage controller with notch filter is introduced. Moreover, the simulation and experimental test of designed controller is provided to validate the voltage controller with notch filter for H6 topology inverter has obvious effect on harmonic suppression.