One-Inductor Single-stage Differential Boost Inverter Operated in Discontinuous Current Mode for Single-Phase Grid-Tied Photovoltaic System

摘要

In this paper, a novel single-stage boost inverter using one inductor is proposed for a grid-tied photovoltaic (PV) inverter. The proposed inverter shares one inductor with two boost converters by utilizing discontinuous current mode (DCM). The output voltage is controlled by the differential voltage between boost converters. Using this topology, the neutral point of the grid can be connected to a terminal of the solar panel. As a results, common-mode noise can be suppressed. The operation of the proposed inverter is confirmed with 100-W prototype with a DC input voltage of 100 V and an AC output voltage of 100 V. The output current THD is 1.4%.