A Comparison Study of High-Frequency Isolated DC/AC Converter Employing an Unfolding LCI for Grid-Connected Alternative Energy Applications

• Published in: IEEE transactions on power electronics Vol. 29; no. 8; pp. 3930 - 3941
• Main Authors: Xiaodong Li, Bhat, Ashoka K. S.
• Format: Journal Article
• Language: English
• Published: New York IEEE 01-08-2014; The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
• Subjects: Alternative energy; Alternative energy generation; Alternative energy sources; Bridge circuits; Converters; Direct current; Direct power generation; Electric converters; Electrical engineering; Electricity generation; Frequencies; Frequency control; Frequency conversion; grid connection; Hafnium; Harmonic distortion; high-frequency (HF) isolation; Integrated circuits; Inverters; resonant converters; Resonant frequency; Switches; Topology; Utilities
• ISSN: 0885-8993; 1941-0107
• DOI: 10.1109/TPEL.2013.2296612

A high-frequency (HF) isolated dc/ac converter including an unfolding line connected inverter can be used as the interface between a small-scale alternative energy generation system and the utility line. This paper presents the review of operation of several different topologies of HF isolated dc/ac converters. They are designed for illustration purpose and compared for their performance. It is found that the dual-LCL series resonant dc/ac converter can maintain zero-voltage switching (ZVS) operation for all switches with low line-current total harmonics distortion (THD) and high efficiency. Experimental results on a 500-W prototype converter are included for validation purpose.