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논문 기본 정보

자료유형
학술저널
저자정보
Chhaya Seng (Chungnam National University) Joungjin Seo (Chungnam National University) Hanju Cha (Chungnam National University)
저널정보
대한전기학회 전기학회논문지 전기학회논문지 제72권 제7호
발행연도
2023.7
수록면
820 - 828 (9page)
DOI
10.5370/KIEE.2023.72.7.820

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This paper proposes a bidirectional dc-dc converter for the energy storage systems (ESS) that operate in forward and backward mode power direction between the DC bus of the PV system and batteries. A bidirectional dc-dc converter with LLC resonant method has the advantage of simple structure and soft switching. In the forward direction, the LLC resonant converter can realize a normalized gain greater than one or less than one and can operate to reach soft switching zero voltage switching (ZVS), and zero current switching (ZCS) in light load and heavy load at the resonant point. However, in the backward direction only a normalized gain of less than one can be achieved. Since the operation modes of the LLC converter are different between forward and backward modes, the operated switching frequency is also different. Without changing the LLC resonant converter’s basic topology, the backward mode of the LLC converter can be achieving soft switching by operating in a specific switching frequency below the resonant. The backward mode of the LLC converter study in this paper is operated at 0.9 value of normalized switching frequency in order to achieve soft switching ZCS with an easy control method. The backward mode of the LLC resonant converter was analyzed in this paper and verified soft switching by simulation and experiment.

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Abstract
1. Introduction
2. Analysis of bidirectional LLC converter operation characteristic
3. Analysis of backward LLC converter operation characteristic
4. Simulation and experiment
5. Conclusion
References

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