Soft-Switching Solid-State Transformer (S4T)

Chen, Hao; Divan, Deepak

doi:10.1109/tpel.2017.2707581

Cited by 131 publications

(45 citation statements)

References 67 publications

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“…Considering simpler topologies or the use of resonant converters were suggested to improve efficiency [71]. As expected, a comparison between single and three-stage transformers conducted in [38] proved that single-stage SSTs are more efficient.…”

Section: Efficiency Of Solid State Transformersmentioning

confidence: 76%

Solid State Transformers Topologies, Controllers, and Applications: State-of-the-Art Literature Review

2018

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With the global trend to produce clean electrical energy, the penetration of renewable energy sources in existing electricity infrastructure is expected to increase significantly within the next few years. The solid state transformer (SST) is expected to play an essential role in future smart grid topologies. Unlike traditional magnetic transformer, SST is flexible enough to be of modular construction, enabling bi-directional power flow and can be employed for AC and DC grids. Moreover, SSTs can control the voltage level and modulate both active and reactive power at the point of common coupling without the need to external flexible AC transmission system device as per the current practice in conventional electricity grids. The rapid advancement in power semiconductors switching speed and power handling capacity will soon allow for the commercialisation of grid-rated SSTs. This paper is aimed at introducing a state-of-the-art review for SST proposed topologies, controllers, and applications. Additionally, strengths, weaknesses, opportunities, and threats (SWOT) analysis along with a brief review of market drivers for prospective commercialisation are elaborated.

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Section: Efficiency Of Solid State Transformersmentioning

confidence: 76%

Solid State Transformers Topologies, Controllers, and Applications: State-of-the-Art Literature Review

2018

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“…The bidirectional bridge arm of that kind of HF ac linked converter replaced by the IGBT in series with a diode or reverse-blocking IGBT, as called dynamic current (Dyna-C) topology [17], allows current to conduct in only one direction but blocks voltages in both directions. Soft-switching technique, high-power prototype design, and a class of partial resonant ac-link topology are developed [18]- [21]. The above matrix converter-type smart transformers mainly interface the three-phase ac with three-phase ac.…”

Section: Introductionmentioning

confidence: 99%

A Simple Space Vector Modulation of High-Frequency AC Linked Three-Phase-to-Single-Phase/DC Converter

Liu

et al. 2020

IEEE Access

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High frequency (HF) ac linked converter functions well to interface between buses with different voltage types. Using a three-phase-to-single-phase matrix converter, a single-phase cyclo converter, and a HF transformer, we can compose a HF ac linked converter to interface between three-phase ac grids and single-phase ac or dc distributed generations (DGs). In this paper, a novel space vector modulation (SVM) method is proposed for such kind of converter. The proposed SVM method converts the mains three-phase ac voltage to a HF ac voltage at the primary side of transformer, and then unfolds the HF ac voltage to a single-phase ac or dc voltage at the secondary side of transformer. Without need to compute separate switching signals for the primary and secondary converters and then coordinate their operations elaborately, the proposed SVM method can be easily implemented by incorporating the HF chopping into the SVM of traditional indirect matrix converter. Therefore, no complicated duty cycle computation or elaborate switching states combination is required. Simulation and hardware-in-loop implementation demonstrate the validity of the proposed method. INDEX TERMS High-frequency ac, matrix converter, space vector modulation, distributed generations.

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“…On this basis, the steady state model for PET has been proposed with considering the power loss characterization of VSC, and it can be applied to the AC/DC hybrid microgrids [7]. Recent research has demonstrated that the number of PET power conversion stage can be threestage, four-stage, and five-stage [8]- [10]. Furthermore, PET has a variety of circuit topologies, in which the low voltage AC and DC ports of mixed frequency modulation PET topology coupled together [11].…”

Section: Introductionmentioning

confidence: 99%

A Decentralized Optimal Operation of AC/DC Hybrid Microgrids Equipped With Power Electronic Transformer

Dong

Zhang

et al. 2019

IEEE Access

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In the AC/DC hybrid microgrids equipped with power electronic transformer (PET), different AC grids and DC grids are connected through multiport PET to operate the entire network in a secure and economic manner. This paper proposes a decentralized optimal power flow model, considering the multiport coordinated control strategy of PET, for running autonomous AC/DC hybrid microgrids. To optimize the power flow in the network, the steady state model of PET is established, including voltage source converter power injection model and Kriging model. By introducing a secondary droop control layer can realize the autonomous operation of AC/DC hybrid microgrids and increase the utilization efficiency of distributed generations. Then using the analytical target cascading approach, each AC/DC sub-microgrid is regarded as different autonomous subjects. The distributed PET is as power coupling node and information interaction node to decompose the optimal problem of AC/DC hybrid microgrids equipped with PET which is solved in parallel. The obtained subproblems for these grid levels are solved with a nested solution process. The simulation results verify the correctness and effectiveness of the proposed model in this paper. INDEX TERMS AC/DC hybrid microgrids, power electronic transformer, steady state model, autonomous operation, decentralized optimal power flow.

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Soft-Switching Solid-State Transformer (S4T)

Cited by 131 publications

References 67 publications

Solid State Transformers Topologies, Controllers, and Applications: State-of-the-Art Literature Review

Solid State Transformers Topologies, Controllers, and Applications: State-of-the-Art Literature Review

A Simple Space Vector Modulation of High-Frequency AC Linked Three-Phase-to-Single-Phase/DC Converter

A Decentralized Optimal Operation of AC/DC Hybrid Microgrids Equipped With Power Electronic Transformer

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