High-efficiency Bidirectional Buck–Boost Converter for Residential Energy Storage System

Seok-Hyeong Ham, Yoon-Geol Choi, Hyeon-Seok Lee, Sang-Won Lee, Su-Chang Lee and Bongkoo Kang
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Seok-Hyeong Ham: Department of Electrical Engineering, Pohang University of Science and Technology, Pohang, Kyungpook 37673, Korea
Yoon-Geol Choi: Department of Electrical Engineering, Pohang University of Science and Technology, Pohang, Kyungpook 37673, Korea
Hyeon-Seok Lee: Department of Electrical Engineering, Pohang University of Science and Technology, Pohang, Kyungpook 37673, Korea
Sang-Won Lee: Department of Electrical Engineering, Pohang University of Science and Technology, Pohang, Kyungpook 37673, Korea
Su-Chang Lee: LG Electronics Co., Ltd., Energy Business Center, 168 Suchul-daero, Gumi, Kyungpook 39368, Korea
Bongkoo Kang: Department of Electrical Engineering, Pohang University of Science and Technology, Pohang, Kyungpook 37673, Korea

Energies, 2019, vol. 12, issue 19, 1-21

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.

Keywords: dc–dc power conversion; buck/boost conversion; step up/down converter; bidirectional converter; pulse frequency modulation (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2019
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