A solid-state transformer is a three-phase ac/ac converter with a high-frequency transformer. Due to advanced features like high power density, on demand var support and frequency regulation, solid-state transformer is an enabling technology for the modern power distribution system. It can also find application in high-power-density motor drives. The single-stage solid-state transformer considered in this paper is capable of bidirectional power flow and open loop power factor correction. This topology uses a minimum amount of copper and has relatively few semiconductor switches. One major problem in this converter is the commutation of leakage energy which results in power loss, reduction in switching frequency, loss of output voltage, and additional common-mode voltage switching. This paper presents a source-based commutation strategy along with a novel modulation technique resulting in 1) elimination of additional snubber circuits, 2) minimization of the frequency of leakage inductance commutation, 3) recovery of the leakage energy, and 4) soft switching of the output converter. The topology and its proposed control have been analyzed. Simulation and experimental results confirm the operation.
|Original language||English (US)|
|Number of pages||13|
|Journal||IEEE Transactions on Power Electronics|
|State||Published - Mar 2014|
Bibliographical noteFunding Information:
The present work has been developed in the framework of an Italian PRIN Project (Research Project of National Interest) named VI-CLOTH (VIrtual CLOTHing), result of a collaboration between Italian departments at the Universita’ di Bergamo, Politecnico di Milano, Universita’ di Firenze and Brescia, cloth manufacturers and CAD-CAM developers. The general objective is the analysis and development of an integrated 3D CAD system for the virtual prototyping of apparel for real manufacturing purposes. In the next Section we briefly describe the main research goals of the project and the overall platform in which our research activity on apparel design takes place.
This work has been carried out in the framework of the national PRIN Project Vi-Cloth, funded by the Italian Ministry MIUR. The authors would like to thank the company F.K. Group Italy, and all colleagues from Universita’ di Bergamo, Politecnico di Milano, Universita’ di Firenze and Universita’ di Brescia, Italy, that are participating to the research project.
© 1986-2012 IEEE.
- High-frequency transformer (HFT)
- PWM AC drive
- indirect modulation
- leakage commutation
- matrix converter
- solid-state transformer