A DC Transformer

Youngquist, Robert C.; Ihlefeld, Curtis M.; Starr, Stanley O.

doi:10.1109/tpel.2013.2266198

Cited by 6 publications

(4 citation statements)

References 9 publications

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“…An isolated power conversion system is essential to achieve voltage transformation and galvanic isolation in the MVDC distributed system, just like the conventional ac power transformer in ac distribution. Owing to some remarkable advantages, for example, high power density, bidirectional power flow and high efficiency [6][7][8][9][10], DC transformer (DCT) is proposed. It is integrated by the power electronic converters and high-frequency transformers (HFTs).…”

Section: Introductionmentioning

confidence: 99%

Model predictive control of input‐series output‐parallel dual active bridge converters based DC transformer

Zhang

et al. 2020

IET Power Electronics

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DC transformer (DCT) which is composed of dual active bridge (DAB) converters, is capable of fulfiling high-ratio voltage conversion between the medium-voltage dc distribution and low-voltage dc distribution. A model predictive control (MPC) strategy was proposed for the DAB-DCT to improve dynamic performance and achieve a proper power distribution, considering the bidirectional power of DCT. The traditional voltage closed-loop control scheme with the single-phase shift (SPS) and the MPC scheme with SPS are compared on a downscale DAB-DCT laboratory prototype, using PowerPC P2020 + FPGA_6SL X45 as the core controller. The excellent dynamic characteristics of DCT with proposed MPC strategy is verified by extensive experimental results.

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Section: Introductionmentioning

confidence: 99%

Model predictive control of input‐series output‐parallel dual active bridge converters based DC transformer

Zhang

et al. 2020

IET Power Electronics

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“…Dc transformer is the key component for electrical isolation and voltage matching purposes in MVDC grids [7]. In medium-voltage ac (MVAC) systems, line-frequency transformers are employed for stepping up/down the voltage.…”

Section: Introductionmentioning

confidence: 99%

“…Modular multilevel converters (MMCs) have emerged as the most promising topology for medium-voltage high-power applications [8]. MMC-based dc/dc converters are employed for collecting power from offshore wind and wave farms, the point-topoint connection of similar or different voltage levels in MVDC grids and controlling power flow in such networks [1][2][3][4][5][6][7]. Among various developed dc/dc converter topologies, MMC-based dc/dc converter with medium-frequency (MF) transformer, which is also known as isolated MMC-based dc/dc converter (IMMCDC), is a promising topology due to its numerous advantages [2,6,9,10].…”

Section: Introductionmentioning

confidence: 99%

Novel multi‐terminal MMC‐based dc/dc converter for MVDC grid interconnection

Jafarishiadeh

Vahidinasab

Sadigh³

et al. 2018

IET Power Electronics

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Multi-terminal modular multilevel converter (MMC)-based dc/dc converter with the medium-frequency ac-link transformer is an attractive and feasible solution for interconnecting medium-voltage direct-current (MVDC) grids. This study proposes a novel multi-terminal dc/dc converter which features significantly reduced number of components compared with the conventional converter topology. The proposed dc/dc converter is capable of interconnecting multiple MVDC grids with different voltage levels as well as controlling the power flow between them. A combination of sine wave modulation scheme and phase disposition level-shifted pulse-width modulation is developed and employed for voltage balancing and controlling the power flow in the proposed converter. Several simulations, experimental and real-time hardware-in-the-loop case studies are carried out to demonstrate the dynamic response and capacitor voltage balancing capability of the proposed MMC and dc/dc converter under the developed control strategy.

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“…In medium-voltage dc (MVDC) distribution, in order to achieve the voltage conversion and electrical isolation between MVDC distribution bus and LVDC microgrid bus, a dc transformer is necessary. In fact, in dc distribution, it is difficult to realize power conversion through simple magnetic transformer as widely used in ac distribution [7]- [8]; it especially needs power electronics technology. In LV applications, dc-dc converters are widely used.…”

Section: Introductionmentioning

confidence: 99%