Startup Strategy With Constant Peak Transformer Current for Solid-State Transformer in Distribution Network

Sun, Jiangtao; Yuan, Liqiang; Gu, Qing; Zhao, Zhengming

doi:10.1109/tia.2018.2883012

Cited by 10 publications

(3 citation statements)

References 23 publications

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“…Soft-start strategies for LLC converters are well-known and demonstrated in the literature. There are many methods already available [7], [14]- [16], and this paper adopts the duty cycle modulation, applied during every DCT start. This strategy is illustrated in Fig.…”

Section: A Soft-startmentioning

confidence: 99%

On Features of Direct Current Transformers

Barcelos,

Dujić

2023

2023 11th International Conference on Power Electronics and ECCE Asia (ICPE 2023 - ECCE Asia)

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The open loop operation of the DC transformer requires some intelligence to deal with the system's dynamics and transients. This converter is realized with a bidirectional LLC converter operating close to the resonant frequency and does not receive any voltage or power set points for its operation. This paper presents the required features to enable a safe and autonomous operation. Essentially, DC transformer behaves as an AC transformer, allowing the natural power flow between two dc buses, creating advanced dc grid layouts. Hence, features such as a power reversal algorithm for bidirectional operation, idle mode for the no-load condition, and soft-start and protection are some of the essential features required for its operation. Developed strategies are verified by means of experimental investigations with two similar prototypes evaluating the performance of the strategies and the difference between both DC transformers with the same features.

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Section: A Soft-startmentioning

confidence: 99%

On Features of Direct Current Transformers

Barcelos,

Dujić

2023

2023 11th International Conference on Power Electronics and ECCE Asia (ICPE 2023 - ECCE Asia)

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“…There are many methods already available [17], [31]- [33], and this paper adopts the duty cycle modulation, applied during every DCT start. This strategy is illustrated in Fig.…”

Section: B Soft Startmentioning

confidence: 99%

Power Reversal Algorithm for Resonant Direct Current Transformers for DC Networks

2022

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The bidirectional resonant DC transformer has all the desired features to drive the development of the DC power distribution networks of the future. This power-electronics converter provides galvanic isolation between DC buses, has desired open loop properties, and follows the system's power flow naturally, requiring only a power reversal algorithm to allow a bidirectional operation and smooth transitions. This paper proposes a solution to tackle the power reversal of the DCT with a dynamic algorithm, considering the system behaviour and the power converter characteristics. The proposed algorithm executes the power reversal in few switching periods and removes the DCT losses during no-load condition. Then, using low voltage prototype of DC transformer, experimental results along the paper demonstrate how this power reversal algorithm is applied under various operating conditions.INDEX TERMS LLC converter, DC transformer, DCT, resonant converter, power reversal, power transition.

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“…Since then, it has attracted more and more attention because it enjoys many advantages including bidirectional power transfer capability, high power density and galvanic isolation [2], [3]. It has wide applications, such as solid state transformer [4], uninterrupted power supply [5], energy management system [6] and DC microgrid [7]. The typical schematic of DAB converter is shown as the following Fig.…”

Section: Introductionmentioning

confidence: 99%

Automatic Triple Phase-Shift Modulation for DAB Converter With Minimized Power Loss

Lin

Zhang

et al. 2022

IEEE Trans. on Ind. Applicat.

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Startup Strategy With Constant Peak Transformer Current for Solid-State Transformer in Distribution Network

Cited by 10 publications

References 23 publications

On Features of Direct Current Transformers

On Features of Direct Current Transformers

Power Reversal Algorithm for Resonant Direct Current Transformers for DC Networks

Automatic Triple Phase-Shift Modulation for DAB Converter With Minimized Power Loss

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