부산대학교 도서관

Photovoltaic inverters (PV) undertake the critical task of converting the DC power output from PV cells into the AC power required by the grid. In this paper, a dual-input Buck-boost inverter (DIBBI) is innovatively proposed, which combines the Buck-boost circuit module and coupled inductor technology, and has the advantages of fewer switching devices, wider input voltage range, and leakage current suppression. Compared with the traditional dual-input inverter, the newly proposed inverter can effectively cope with the challenge of DC voltage imbalance between PV cells by introducing a coupled inductor, which improves energy utilization of photovoltaic cells. The adoption of dead-beat control (DBC) provides the inverter with extremely dynamic response performance and low current harmonic distortion. Simulation tests verify that the inverter can maintain good grid-connected power quality under balanced and unbalanced input energy conditions.