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Open AccessArticle

A New Buck-Boost AC/DC Converter with Two-Terminal Output Voltage for DC Nano-Grid

1
Department of Electronic Engineering, Shanghai Maritime University, Shanghai 201306, China
2
Department of Electronic Engineering, City University of Hong Kong, Hong Kong 999077, China
3
Department of Energy Technology, Aalborg University, Aalborg DK-9220, Denmark
*
Author to whom correspondence should be addressed.
Energies 2019, 12(20), 3808; https://doi.org/10.3390/en12203808
Received: 7 August 2019 / Revised: 29 September 2019 / Accepted: 30 September 2019 / Published: 9 October 2019
(This article belongs to the Special Issue Grid-Connected Converters)
Due to the development and deployment of renewable DC power sources and their inherent advantages for DC loads in applications, the DC nano-grid has attracted more and more research attentions; especially the topologies of AC/DC converters are increasingly studied. When designing an AC to DC converter for a DC nano-grid system, the grounding configuration, which determines the costs, the efficiency as well as the safety, plays an important role. A three-terminal output AC to DC converter based on united grounding configuration has been presented for DC nano-grid. However, it has to be pointed out that the three-terminal output DC nano-grid is not as popular as the two-terminal DC output one, due to the infrastructure consideration. This paper proposes a new Buck-Boost AC to DC converter with two-terminal output voltage for DC nano-grid. The operating principle, the steady-state analysis, and the small signal modelling for the proposed converter working in continuous conduction mode are presented in detail. A 220 V/50 Hz/800 W prototype was fabricated to verify the effectiveness of the proposed converter. View Full-Text
Keywords: buck-boost; converter; dc nano-grid; single inductor buck-boost; converter; dc nano-grid; single inductor
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Li, X.; Wu, W.; Wang, H.; Gao, N.; Chung, H. .-H.; Blaabjerg, F. A New Buck-Boost AC/DC Converter with Two-Terminal Output Voltage for DC Nano-Grid. Energies 2019, 12, 3808.

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