Overview of Single-Stage Isolated AC-DC Topologies for Interfacing DC and AC Grids

Carvalho, Edivan Laércio; Blinov, Andrei; Chub, Andrii; Vinnikov, Dmitri

doi:10.1109/pedg54999.2022.9923249

Cited by 15 publications

(2 citation statements)

References 61 publications

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“…Alternatively, single-stage ac-dc converters utilize a high-frequency link as an emerging solution [12]. In this setup, an active-bridge is used to link the dc side and high-frequency transformer (HFT), while the ac side the HFT connects to a matrix-converter, which sinusoidally modulates the currents and steps down the frequency to line frequency [13]- [15].…”

Section: Introductionmentioning

confidence: 99%

Three-Phase Bidirectional Isolated AC–DC Matrix-Converter With Full Soft-Switching Range

Carvalho,

Blinov,

Emiliani

et al. 2023

IEEE Access

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Galvanically isolated ac-dc converters are crucial for integrating distribution generation, energy storage, dc microgrids, and electric vehicles with ac distribution system. The typical industrial approach involves a two-stage setup (ac-dc/dc-dc) with a bulky dc link capacitor, and dual-active bridge converter (dc-dc) for isolation. However, this leads to increased power losses due to multiple power processing stages. To overcome this issue, this paper proposes a three-phase bidirectional isolated ac-dc matrix-converter, as a candidate solution. This topology employs a high-frequency link, eliminating the need for a traditional intermediate dc link found in a standard two-stage solution. As a main contribution, a quasi-resonant modulation strategy is introduced to allow all semiconductors to operate under softswitching for a wide operating range. A 3.5 kW prototype was built to compare proposed one with the twostage ac-dc converter. The experimental results show that the proposed converter achieved 96.5% efficiency at nominal power, outperforming the conventional converter, which reached 95.4% efficiency, mainly due to the extra power processing stage in the two-stage solution.INDEX TERMS Direct matrix type, isolated rectifier, matrix-converter, three-phase power factor correction (PFC) converter.

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Section: Introductionmentioning

confidence: 99%

Three-Phase Bidirectional Isolated AC–DC Matrix-Converter With Full Soft-Switching Range

Carvalho,

Blinov,

Emiliani

et al. 2023

IEEE Access

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“…Ref. [22] gives an overview of single-stage isolated AC-DC topologies for interfacing DC and AC grids, and building up on this, in [23] the hold-up time is treated. Ref.…”

Section: Introductionmentioning

confidence: 99%

Simple Chargers for a Small DC Micro-Grid for a Home Emergency Power System

Himmelstoss

Votzi

2023

Electricity

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Recently, the danger of a long blackout is discussed in Europe. Blackouts can be caused by failures in the energy distribution, errors in large power plants or even cyber-attacks. This can lead to a chain reaction and a disintegration of the mains. Longer blackouts have an extreme impact on the economy as a whole and on local households. Therefore, a small local grid at home which can supply the most important loads over some time has garnered increasing interest. With a small direct current (DC) grid, critical loads such as for deep freezers and refrigerators can be supplied, and some LED lights can be used in the evening or at night. Solar generators (panels) can be used to charge energy storage devices, e.g., batteries. A DC grid can not only be used in the case of an emergency, but can also be used to reduce energy consumption out of the public mains and reduce energy bills. The architecture of the household emergency DC grid is discussed; suggestions for batteries are given; two simple chargers, based on DC-DC-converters like the Buck (step-down) and on the Boost (step-up) converters, are shown; dimensioning suggestions are given; and simple, robust controllers, a P-controller with disturbance feedforward and a hysteresis controller, are treated and tested via simulations. The goal of the paper is to show a simple autonomous home energy system without an external fieldbus, LAN or internet connection with special focus on simple charger topologies.

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DC Microgrid: State of Art, Driving Force, Challenges and Perspectives

Husev,

Vinnikov

2023

Studies in Systems, Decision and Control

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Overview of Single-Stage Isolated AC-DC Topologies for Interfacing DC and AC Grids

Cited by 15 publications

References 61 publications

Three-Phase Bidirectional Isolated AC–DC Matrix-Converter With Full Soft-Switching Range

Three-Phase Bidirectional Isolated AC–DC Matrix-Converter With Full Soft-Switching Range

Simple Chargers for a Small DC Micro-Grid for a Home Emergency Power System

DC Microgrid: State of Art, Driving Force, Challenges and Perspectives

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