A Novel Solid-State Transformer With Loosely Coupled Resonant Dual-Active-Bridge Converters

Lee, Jae Hong; Roh, Junghyeon; Kim, Myung Yong; Baek, Seung-Hyuk; Kim, Sung-Min; Lee, Seung Hwan

doi:10.1109/tia.2021.3119535

Cited by 11 publications

(3 citation statements)

References 22 publications

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“…The SST windings can be the same as single-phase [139], three-phase [140], single-phase multi-winding [141], three-phase multi-winding [142], split winding [132], and Scott-T transformers [143]. In [144], the HF transformers are replaced with loosely coupled inductive power transfer (IPT) coils leading to simple high-voltage insulation, low parasitic capacitance, reduction in the number of output power electronic converters, easy packaging, and scalability although lower efficiency. There are still other classification of SSTs based on voltage level, control of isolation stage, and modularity structure, which are reported in [20].…”

Section: Ssts Classificationmentioning

confidence: 99%

Review of Solid-State Transformer Applications on Electric Vehicle DC Ultra-Fast Charging Station

2022

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The emergence of DC fast chargers for electric vehicle batteries (EVBs) has prompted the design of ad-hoc microgrids (MGs), in which the use of a solid-state transformer (SST) instead of a low-frequency service transformer can increase the efficiency and reduce the volume and weight of the MG electrical architecture. Mimicking a conventional gasoline station in terms of service duration and service simultaneity to several customers has led to the notion of ultra-fast chargers, in which the charging time is less than 10 min and the MG power is higher than 350 kW. This survey reviews the state-of-the-art of DC ultra-fast charging stations, SST transformers, and DC ultra-fast charging stations based on SST. Ultra-fast charging definition and its requirements are analyzed, and SST characteristics and applications together with the configuration of power electronic converters in SST-based ultra-fast charging stations are described. A new classification of topologies for DC SST-based ultra-fast charging stations is proposed considering input power, delta/wye connections, number of output ports, and power electronic converters. More than 250 published papers from the recent literature have been reviewed to identify the common understandings, practical implementation challenges, and research opportunities in the application of DC ultra-fast charging in EVs. In particular, the works published over the last three years about SST-based DC ultra-fast charging have been reviewed.

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Section: Ssts Classificationmentioning

confidence: 99%

Review of Solid-State Transformer Applications on Electric Vehicle DC Ultra-Fast Charging Station

2022

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“…The four main dc-dc conversion structures in different applications and powers are presented with their control strategies. Related to this study, ST models for solar PV power systems are presented in References [51][52][53][54][55][56]. To reduce the dual-side backflow power and increase the DAB converter's effectiveness for a variety of voltage conversion situations, a single-stage dc smart transformer based on a DAB converter is developed.…”

Section: Introductionmentioning

confidence: 99%

“…Loosely coupled coils are used in place of the HF transformers used in traditional STs. The efficiencies of the proposed DAB converter and ST model are 97.4% and 95.2% at 2.4 kW [52]. A forward dual-active-bridge-based ST topology is presented.…”

Section: Introductionmentioning

confidence: 99%

Soft-Switching Smart Transformer Design and Application for Photovoltaic Integrated Smart City Power Distribution

Esenboga¹,

Demirdelen²

2022

Sustainability

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Smart city power distributions have become promising technologies to meet the demand for energy in developed countries. However, increase in smart grids causes several power quality problems on the smart grid, in particular, current and voltage harmonic distortions, sudden voltage sag and swells, fault current, and isolation deterioration. Smart transformers are potential solutions to improve the power quality on the electric grid. They present energy efficiency, ensure grid reliability and power flow control, voltage regulation, bidirectional power flow, fault current limiting, harmonic blocking, and galvanic isolation. Therefore, this paper offers an optimal selection of a three-stage (AC-DC-DC-AC) smart transformer model and power control strategy for solar PV power plant integrated smart grids. The topology of the rectifier, isolated bidirectional converter, and inverter has soft-switching features. This enables low conduction loss, low electromagnetic interference (EMI), high efficiency, achievable zero-voltage switching for converters, and zero-current switching for electrical auxiliary systems. Operation strategies of the proposed ST, PWM control, voltage, and current control between converters, including a medium-voltage (MV) high-frequency transformer to realize a 10 kVA, 450 Vdc to 220 Vdc, or 220 Vac ST, are presented. Significantly, the ST prototype achieves 96.7% conversion efficiency thanks to its control strategy, even under unstable power generation conditions from the solar PV plant. Experimental results obtained on the 344 Vac 10.4 A load current validates the dv/dt rate 6.8 kV/us. The dynamic and experimental results of the proposed bidirectional smart transformer demonstrate the success in preventing power quality problems for photovoltaic integrated smart city power distribution.

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High dv/dt immunity, high insulation voltage, ultra-compact, inductive power supply for gate-drivers of wide-bandgap semiconductor switches

et al. 2022

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A Novel Solid-State Transformer With Loosely Coupled Resonant Dual-Active-Bridge Converters

Cited by 11 publications

References 22 publications

Review of Solid-State Transformer Applications on Electric Vehicle DC Ultra-Fast Charging Station

Review of Solid-State Transformer Applications on Electric Vehicle DC Ultra-Fast Charging Station

Soft-Switching Smart Transformer Design and Application for Photovoltaic Integrated Smart City Power Distribution

High dv/dt immunity, high insulation voltage, ultra-compact, inductive power supply for gate-drivers of wide-bandgap semiconductor switches

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