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http://dx.doi.org/10.5370/JEET.2013.8.6.1400

Grid-tied Power Converter for Battery Energy Storage Composed of 2-stage DC-DC Converter  

Kim, Do-Hyun (Dept. of Electrical and Electronic Engineering, Myongji University)
Lee, Yoon-Seok (Dept. of Electrical and Electronic Engineering, Myongji University)
Han, Byung-Moon (Dept. of Electrical and Electronic Engineering, Myongji University)
Kim, Ju-Yong (KEPCO Research Institute, Smart Energy Lab.)
Chae, Woo-Kyu (KEPCO Research Institute, Smart Energy Lab.)
Publication Information
Journal of Electrical Engineering and Technology / v.8, no.6, 2013 , pp. 1400-1408 More about this Journal
Abstract
This paper proposes a new grid-tied power converter for battery energy storage, which is composed of a 2-stage DC-DC converter and a PWM inverter. The 2-stage DC-DC converter is composed of an LLC resonant converter connected in cascade with a 2-quadrant hybrid-switching chopper. The LLC resonant converter operates in constant duty ratio, while the 2-quadrant hybrid-switching chopper operates in variable duty ratio for voltage regulation. The operation of proposed system was verified through computer simulations. Based on computer simulations, a hardware prototype was built and tested to confirm the technical feasibility of proposed system. The proposed system could have relatively higher efficiency and smaller size than the existing system.
Keywords
Grid-tied power converter; 2-stage DC-DC converter; LLC resonant converter; 2-quadrant hybrid-switching chopper; Battery energy storage;
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