An ISOP Hybrid DC Transformer Combining Multiple SRCs and DAB Converters to Interconnect MVDC and LVDC Distribution Networks

Yao, Jing; Chen, Wu; Chenyang, Xue; Yuan, Yubo; Wang, Tao

doi:10.1109/tpel.2020.2983954

Cited by 94 publications

(19 citation statements)

References 38 publications

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“…A p ∝ S T ∝ V MWT ), they can be related to the processed power. Thus, in a simplified approach, the MWT can be considered a simple cube, so that V MWT ∝ (S T ) 3 4 [44], [46]. Assuming that 2WT is a particular design of MWT (i.e.…”

Section: B Power Densitymentioning

confidence: 99%

A Comprehensive Assessment of Multiwinding Transformer-Based DC–DC Converters

Pereira

Hoffmann

Zhu

et al. 2021

IEEE Trans. Power Electron.

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Multiwinding-Transfomer-based (MTB) DC-DC converter did emerge in the last 25 years as an interesting possibility to connect several energy systems and/or to offer higher power density because of the reduction of transformer core material and reduction of power converter stages. MTB DC-DC converters can be considered as an interesting compromise between non-modular and a modular DC-DC converter since they are themselves modular in the construction. This eventually leads to some fault-tolerant possibilities since the multiwinding transformer (MWT) connects multiples ports and if one of them is not working anymore and it can be isolated, the others might still continue operating. Unfortunately, it is exactly the MWT that creates most of the technical challenges of this class of DC-DC converters because of the cross-coupling effects among the cells which make especially the resonant-topology very challenging to be designed. This paper reviews the history of the MTB DC-DC and then provides a classification of them, comparing them with Figure of Merits (FOM) and focusing on which is the maximum possible number of windings and which are the most suited magnetic core types. The problems coming from cross-coupling and the possible fault-tolerant operation are analysed with the help of simulation and experimental results.

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Section: B Power Densitymentioning

confidence: 99%

A Comprehensive Assessment of Multiwinding Transformer-Based DC–DC Converters

Pereira

Hoffmann

Zhu

et al. 2021

IEEE Trans. Power Electron.

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“…Aligned with the possibility of the SST for creating hybrid AC/DC grids, in [99], an SST is proposed that would allow for the configuration of hybrid AC/DC grids as a promising solution to obtain simultaneous control of power flow and voltage and consisting of a low voltage DC grid. In [100], a hybrid SST in an input-series output-parallel configuration is proposed that is suitable for connecting MVDC and LVDC distribution grids. In [101], a hybrid and modular SST is proposed, combining control flexibility and high op- Aligned with the possibility of the SST for creating hybrid AC/DC grids, in [99], an SST is proposed that would allow for the configuration of hybrid AC/DC grids as a promising solution to obtain simultaneous control of power flow and voltage and consisting of a low voltage DC grid.…”

Section: Solid-state Transformermentioning

confidence: 99%

“…In [101], a hybrid and modular SST is proposed, combining control flexibility and high op- Aligned with the possibility of the SST for creating hybrid AC/DC grids, in [99], an SST is proposed that would allow for the configuration of hybrid AC/DC grids as a promising solution to obtain simultaneous control of power flow and voltage and consisting of a low voltage DC grid. In [100], a hybrid SST in an input-series output-parallel configuration is proposed that is suitable for connecting MVDC and LVDC distribution grids. In [101], a hybrid and modular SST is proposed, combining control flexibility and high operating efficiency, while problems related to modeling and control strategies are also discussed.…”

Section: Solid-state Transformermentioning

confidence: 99%

Review of a Disruptive Vision of Future Power Grids: A New Path Based on Hybrid AC/DC Grids and Solid-State Transformers

et al. 2021

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Power grids are evolving with the aim to guarantee sustainability and higher levels of power quality for universal access to electricity. More specifically, over the last two decades, power grids have been targeted for significant changes, including migration from centralized to decentralized paradigms as a corollary of intensive integration of novel electrical technologies and the availability of derived equipment. This paper addresses a review of a disruptive vision of future power grids, mainly focusing on the use of hybrid AC/DC grids and solid‑state transformers technologies. Regarding hybrid AC/DC grids in particular, they are analyzed in detail in the context of unipolar and bipolar DC grids (i.e., two‑wire or three‑wire DC grids), as well as the different structures concerning coupled and decoupled AC configurations with low‑frequency or high‑frequency isolation. The contextualization of the possible configurations of solid‑state transformers and the different configurations of hybrid transformers (in the perspective of offering benefits for increasing power quality in terms of currents or voltages) is also analyzed within the perspective of the smart transformers. Additionally, the paper also presents unified multi‑port systems used to interface various technologies with hybrid AC/DC grids, which are also foreseen to play an important role in future power grids (e.g., the unified interface of renewable energy sources and energy storage systems), including an analysis concerning unified multi‑port systems for AC or DC grids. Throughout the paper, these topics are presented and discussed in the context of future power grids. An exhaustive description of these technologies is made, covering the most relevant and recent structures and features that can be developed, as well as the challenges for the future power grids. Several scenarios are presented, encompassing the mentioned technologies, and unveiling a progressive evolution that culminates in the cooperative scope of such technologies for a disruptive vision of future power grids.

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“…In addition, [24] and [25] apply open‐loop controlled SRCs to the DC SST application to obtain high efficiency, while the terminal voltage and transmission power cannot be regulated. In [26], a hybrid DC SST consisting of multiple SRCs and one or several DAB converters is proposed, which can regulate terminal voltage by DAB converter and achieve high efficiency thanks to SRCs.…”

Section: Introductionmentioning

confidence: 99%

A bidirectional three‐phase triple‐voltage LLC (T ² ‐LLC) resonant converter for DC/DC stage in solid state transformer and DC transformer applications

Shu

Chen

Jin

2022

IET Power Electronics

Self Cite

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This paper proposes a novel bidirectional three‐phase triple‐voltage LLC (T2‐LLC) resonant converter, which can be applied as the submodule of DC transformer (DCT) with fixed input and output terminal voltages. A novel series‐connected three‐phase circuit is adopted at medium voltage (MV) side to improve the voltage level of single submodule (SM) and decrease SM number. Therefore, the power density of DCT can be improved. Besides, the proposed converter is open‐loop controlled with fixed switching frequency, and it naturally realizes bidirectional power flow without changing controlling modes according to the power direction. However, the efficiency and voltage conversion ratio of proposed T2‐LLC converter are sensitive to resonant parameters, and consistency of three‐phase resonant parameters should be ensured to achieve three‐phase symmetrical operation. Therefore, design and optimization methods are proposed to realize ZVS turn‐on, reduce power losses and ensure fixed voltage conversion ratio. The operation principle and optimization method are presented and a 1000 V/333.3 V/5 kW platform is used to validate feasibility of the proposed converter.

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An ISOP Hybrid DC Transformer Combining Multiple SRCs and DAB Converters to Interconnect MVDC and LVDC Distribution Networks

Cited by 94 publications

References 38 publications

A Comprehensive Assessment of Multiwinding Transformer-Based DC–DC Converters

A Comprehensive Assessment of Multiwinding Transformer-Based DC–DC Converters

Review of a Disruptive Vision of Future Power Grids: A New Path Based on Hybrid AC/DC Grids and Solid-State Transformers

A bidirectional three‐phase triple‐voltage LLC (T ² ‐LLC) resonant converter for DC/DC stage in solid state transformer and DC transformer applications

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An ISOP Hybrid DC Transformer Combining Multiple SRCs and DAB Converters to Interconnect MVDC and LVDC Distribution Networks

Cited by 94 publications

References 38 publications

A Comprehensive Assessment of Multiwinding Transformer-Based DC–DC Converters

A Comprehensive Assessment of Multiwinding Transformer-Based DC–DC Converters

Review of a Disruptive Vision of Future Power Grids: A New Path Based on Hybrid AC/DC Grids and Solid-State Transformers

A bidirectional three‐phase triple‐voltage LLC (T 2 ‐LLC) resonant converter for DC/DC stage in solid state transformer and DC transformer applications

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A bidirectional three‐phase triple‐voltage LLC (T ² ‐LLC) resonant converter for DC/DC stage in solid state transformer and DC transformer applications