Solid-state Transformer Architecture using AC-AC Dual-Active-Bridge Converter


Modern development of semiconductor power-switching devices has promoted the use of power electronic converters as power transformers at the distribution level. This paper presents an ac-ac dual-active-bridge (DAB) converter for a solid-state transformer. The proposed converter topology consists of two active H-bridges and one high-frequency transformer. Four-quadrant switch cells are used to allow bidirectional power flow. Because power is controlled by the phase shift between two bridges, output voltage can be regulated when input voltage changes. This paper analyzes the steady-state operation and the range of zero-voltage switching. It develops a switch commutation scheme for the ac-ac DAB converters. Experimental results from a scaled-down prototype are provided to verify the theoretical analysis.


Electrical and Computer Engineering

Keywords and Phrases

Phase Shift; Phase Shifters; Power Transformers; Semiconductor Devices; AC-AC Converters; Bidirectional Power Flow; Dual-Active-Bridge (DAB) Converter; Four-Quadrant Switches; Phase Shift Modulation (PSM); Power Electronic Converters; Solid State Transformers (SST); Steady-State Operation; Zero Voltage Switching (ZVS); Bidirectional AC-AC Converter; Solid-State Transformer

International Standard Serial Number (ISSN)

0278-0046; 1557-9948

Document Type

Article - Journal

Document Version


File Type





© 2013 Institute of Electrical and Electronics Engineers (IEEE), All rights reserved.

Publication Date

01 Sep 2013