Abstract

Multiport dc-ac converters are becoming a pivotal technology to integrate renewable energy sources, energy storage systems and ac grids/loads. This article presents a classification and comparative analysis of the recently proposed single-stage three-port topologies. The study leads to the definition of three major groups, based on the operation principle to perform the dc-dc-ac power conversion. Each group is analysed in terms of the rated power, voltage boost characteristic and components count. Furthermore, a comparative study is performed to provide the best suited applications for each category.