An Integrated Solid-State Transformer With High-Frequency Isolation for EV Fast-Charging Applications

Pool-Mazun, Erick I.; Sandoval, Jose Juan; Enjeti, P.N.; Pitel, I.J.

doi:10.1109/jestie.2020.3003355

Cited by 35 publications

(10 citation statements)

References 27 publications

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“…In addition to the renewables interface, in [104], a SST configuration is proposed that uses multiple DC-DC converters according to the number of panels, and the interface with the power grid is carried out by the SST. On the other hand, [105] proposes the use of a modular SST for fast charging applications for electric mobility, based on the concept of using multiple DC-DC converters according to the number of vehicles and requiring only one interface with the power grid, i.e., a DC grid is created with individual converters for charging EVs.…”

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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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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“…This will allow them to draw power from the grid, raising concerns regarding its impact on the power grid. However, such charging stations are being implemented utilizing SSTs and have shown much progress and high efficiency compared to other alternatives [80]. Harmonic filtering is another feature that will aid the integration of various sources and devices.…”

Section: Applicationmentioning

confidence: 99%

“…This will allow them to draw power from the grid, raising ing its impact on the power grid. However, such charging stations are be utilizing SSTs and have shown much progress and high efficiency com ternatives [80].…”

Section: Applicationmentioning

confidence: 99%

Solid-State Transformers: Fundamentals, Topologies, Applications, and Future Challenges

et al. 2021

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Solid-state transformers (SSTs) have emerged as a superior alternative to conventional transformers and are regarded as the building block of the future smart grid. They incorporate power electronics circuitry and high-frequency operation, which allows high controllability and enables bi-directional power flow, overcoming the limitations of conventional transformers. This paper presents a detailed analysis of the solid-state transformer, expounding the fundamentals, converter topologies, applications, and future challenges of the SST in a systematic manner. The paper discusses the necessity of improved replacement of the low-frequency transformers (LFTs) and presents the configuration of SST. It presents SST fundamentals in individual stages and explores its origin and evolution. The basic topologies, their specifications, and control strategies are also described. The applications of SST as a replacement of LFTs are discussed along with recent applications. The future challenges for real-time implementation of SSTs are explored, and research directions are proposed.

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“…Multipulse rectifiers (MPR) have become essential in many applications such as medium-voltage variable speed drives [1] or fast-charging batteries [2], [3] to comply with the harmonic standard requirements [4]. Transformer Rectifier Units (TRUs) and Auto-Transformer Rectifier Units (ATRUs) are powered by a phase-shifting transformer with many secondary windings that depend on the number of pulses since each secondary winding feeds a six-pulse diode rectifier [5].…”

Section: Introductionmentioning

confidence: 99%

“…Other numbers of pulses can be used, such as a ten-pulse diode rectifier is applied in the case of five-phase generators [6]. The reduction of the harmonic distortion is due to the cancelation of the low-order harmonic currents generated by the rectifier [3], [7]. Moreover, multipulse rectifiers can operate at a near-unity power factor by increasing the number of pulses, and line current harmonic distortion is also reduced [8].…”

Section: Introductionmentioning

confidence: 99%

New Methodology to Calculate DC Voltage Signature in N-Phases TRUs Under Supply Voltage Sags

Saura¹,

Bakkar²,

Bogarra³

2022

IEEE Access

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A new methodology based on the shadow projection has been developed to study any multipulse rectifier's dynamic behavior under balanced and unbalanced conditions. The proposed methodology calculates the DC average voltage and instantaneous values under balanced and unbalanced supply voltage conditions for multiphase Transformer Rectifier Units (TRUs). The calculation of the developed algorithms is more practical than the classical methods and other approaches based on Fourier series or symmetrical components that are difficult to apply under unbalanced conditions. Furthermore, classical methods are not simple to determine the limits of the integrals and calculate them to obtain the average value, so a more friendly and practical methodology has been developed to analyze rectifiers operating under supply voltage sags. This new methodology has been validated by simulation for a 12-pulse TRU in series and parallel connections, and it has also been validated for a 36-pulse TRU in parallel connection using interphase inductors. The accuracy of the calculations is validated by the experimental results for 12-pulse TRUs, series, and parallel connection, and 18-pulse TRU in series connection.INDEX TERMS Multipulse rectifier, shadow projection, transformer rectifier unit, unbalanced voltage condition, sags.

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An Integrated Solid-State Transformer With High-Frequency Isolation for EV Fast-Charging Applications

Cited by 35 publications

References 27 publications

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

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

Solid-State Transformers: Fundamentals, Topologies, Applications, and Future Challenges

New Methodology to Calculate DC Voltage Signature in N-Phases TRUs Under Supply Voltage Sags

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