A Modified Grid-Connected Inverter Topology for Power Oscillation Suppression under Unbalanced Grid Voltage Faults

Under unbalanced grid voltage faults, the output power oscillation of a grid-connected inverter is an urgent problem to be solved. In traditional topology inverters, it impossible eliminate and simultaneously maintain balanced current waveform. this paper, considering solvability reference matrix equation, inherent mechanism analyzed, modified with auxiliary modules inserted in series between filter point common coupling (PCC) proposed. Due extra controllable freedoms provided by modules, could generate correct PCC while keeping balance current, so as power. Simulation experimental results verify effectiveness proposed topology.