Experimental Verification of Isolated Grid-connected Inverter with Small Passive Component

Abstract

This paper proposes an isolated DC/AC converter that has a small inductor and capacitor. In the proposed converter, an active power decoupling circuit is applied to a synchronous rectifier, which can compensate for the double-line frequency ripple of single-phase AC grid using a small capacitor. In addition, the proposed converter can achieve zero current switching using pulse density modulation (PDM). From the experimental result, the second-order harmonics of the input voltage is reduced to 2% in comparison to the DC components. In addition, the inverter output current THD of 2.2% is achieved.