High-efficiency Bidirectional Buck-Boost Converter for Residential Energy Storage System
SCIE
SCOPUS
- Title
- High-efficiency Bidirectional Buck-Boost Converter for Residential Energy Storage System
- Authors
- Ham, Seok-Hyeong; Choi, Yoon-Geol; Lee, Hyeon-Seok; Lee, Sang-Won; Lee, Su-Chang; KANG, BONG KOO
- Date Issued
- 2019-10
- Publisher
- Multidisciplinary Digital Publishing Institute (MDPI)
- Abstract
- This paper proposes a bidirectional dc-dc converter for residential micro-grid applications. The proposed converter can operate over an input voltage range that overlaps the output voltage range. This converter uses two snubber capacitors to reduce the switch turn-off losses, a dc-blocking capacitor to reduce the input/output filter size, and a 1:1 transformer to reduce core loss. The windings of the transformer are connected in parallel and in reverse-coupled configuration to suppress magnetic flux swing in the core. Zero-voltage turn-on of the switch is achieved by operating the converter in discontinuous conduction mode. The experimental converter was designed to operate at a switching frequency of 40-210 kHz, an input voltage of 48 V, an output voltage of 36-60 V, and an output power of 50-500 W. The power conversion efficiency for boost conversion to 60 V was >= 98.3% in the entire power range. The efficiency for buck conversion to 36 V was >= 98.4% in the entire power range. The output voltage ripple at full load was <3.59 V-p.p for boost conversion (60 V) and 1.35 V-p.p for buck conversion (36 V) with the reduced input/output filter. The experimental results indicate that the proposed converter is well-suited to smart-grid energy storage systems that require high efficiency, small size, and overlapping input and output voltage ranges.
- URI
- https://oasis.postech.ac.kr/handle/2014.oak/101132
- DOI
- 10.3390/en12193786
- ISSN
- 1996-1073
- Article Type
- Article
- Citation
- Energies, vol. 12, no. 19, 2019-10
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