Design and implementation of high efficient two-stage three-phase/level isolated PV converter

Author

Shusheng Wei;Fanbo He;Liqiang Yuan;Zhengming Zhao;Ting Lu;Junchao Ma

Author_Institution

State Key Lab of Power Systems, Department of Electrical Engineering, Tsinghua University, Beijing, 100084, China

fYear

2015

Firstpage

1649

Lastpage

1654

Abstract

This paper presents the design and implementation of an ultra-high efficient two-stage PV converter consisting of full-bridge DC/DC converter as the first stage and three-level T-type DC/AC inverter as the second stage. Firstly, the operation principles of full-bridge DC/DC converter and DC/AC converter are given in this paper. Then the control algorithm of the converter is analyzed and implemented. For the DC/AC converter, the impacts of both modulation strategy and device technology on efficiency are discussed and investigated. Finally, a 10kW/300V two-stage PV inverter consisting of a full-bridge DC/DC converter based on all SiC devices and T-type inverter based on hybrid devices is built. The impacts of different factors such as the transformer turn ratio of the DC/DC converter and DC-link voltage on the efficiency are evaluated by experiment. Efficiency values of 97.1%, 99.2% and 95.9% are achieved for the DC/DC stage, DC/AC stage and the overall system, respectively.

Keywords

"Decision support systems","Inverters","Switches","Bridge circuits","Algorithm design and analysis","Modulation","Silicon carbide"

Publisher

ieee

Conference_Titel

Electrical Machines and Systems (ICEMS), 2015 18th International Conference on

Type

conf

DOI

10.1109/ICEMS.2015.7385305

Filename

7385305