Adaptive Modulation of Resonant DAB Converters for Wide Range ZVS Operation With Minimum Reactive Circulating Power

James, L. D.; Teixeira, C. A.; Wilkinson, Robert A.; McGrath, Brendan; Holmes, D.G.; Riedel, J.

doi:10.1109/tia.2022.3192366

Cited by 9 publications

(1 citation statement)

References 27 publications

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“…It has been applied in fields such as data centers, electric vehicles, and power electronic transformers. However, there are still some problems with current DAB converters, which usually only enable the soft switching of two switches at zero voltage over a narrow power range and are relatively complex to control [6][7][8][9].…”

Section: Introductionmentioning

confidence: 99%

An Input-Series-Output-Parallel Cascaded Converter System Applied to DC Microgrids

Wang

Wei

et al. 2023

Symmetry

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Direct current transformer (DCT) is a key piece of equipment in direct current (DC) microgrids, and the mainstream topologies mainly include LLC resonant converter (LLC) and dual active bridge (DAB). In this paper, a novel bi-directional buck/boost + CLLLC cascade topology is proposed for the input-series-output-parallel cascade converter system of a DC microgrid. To solve the problem that frequency variation causes the converter to deviate from the optimal operating point, resulting in low efficiency, and the inability to achieve a soft switching function. The CLLLC converter operates near the resonant frequency point as a DCT, only providing electrical isolation and voltage matching, while the buck/boost converter controls the output voltage and the voltage and current sharing of each module. Compared to other cascaded converter systems, the cascaded converter proposed in this paper has high efficiency, simplifies the parameter design, and is suitable for wide input and wide output operating conditions. The system adopts a three-loop control strategy, establishes the small-signal modeling of the system, and its stability is verified by theoretical analysis and simulation. The simulation and experimental results verify the correctness of the proposed cascaded converter based on buck/boost + CLLLC and the effectiveness of the control strategy.

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Section: Introductionmentioning

confidence: 99%