Comparison of the Modular Multilevel DC Converter and the Dual-Active Bridge Converter for Power Conversion in HVDC and MVDC Grids

Engel, Stefan P.; Stieneker, Marco; Soltau, Nils; Rabiee, Sedigheh; Stagge, Hanno; Doncker, Rik W. De

doi:10.1109/tpel.2014.2310656

Cited by 396 publications

(245 citation statements)

References 38 publications

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“…The discrete-time model in a whole switching cycle can be derived by integrating the four equations in (5). Let the values of x at the beginning of the n-th and the (n ?…”

Section: Full Discrete-time Modelingmentioning

confidence: 99%

“…Applications such as plug-in hybrid electric vehicles [1], renewable energy storage [2], uninterruptible power supply (UPS) systems [3], aerospace applications [4] and smart grids [5] usually need an energy storage device, which increase the popularity of the bidirectional DC-DC converters. As the DAB converter has many advantages, such as galvanic isolation, zero-voltage switching, high power density, high efficiency, and symmetric structure [6], it has been drawn more attention compared with other bidirectional DC-DC converters.…”

Section: Introductionmentioning

confidence: 99%

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Stability analysis of digitally controlled dual active bridge converters

Shi

Liu

et al. 2017

J. Mod. Power Syst. Clean Energy

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The dual active bridge (DAB) converters are widely used in the energy storage equipment and the distributed power systems. However, the existence of switching nonlinearity and control delay can cause serious stability problem to the DAB converters. Thus, this paper, studies the stability of a digitally controlled DAB converter with an output voltage closed loop controller. Firstly, to accurately study the stability in a DAB converter, a discrete-time model established in a whole switching period is obtained. The model considers the output capacitor ESR, the digital control delay, and sample-and-hold process. By using this model, the stabilities of the DAB converter versus the proportional controller parameter and the output capacitor ESR are analyzed and the critical values are predicted accurately. Moreover, the stability boundary of the proportional controller parameter and the output capacitor ESR is also obtained. The result shows that the value of the output capacitor ESR can have a great effect on the stability region of the proportional controller parameter. Finally, the theoretical analyses are verified by the simulation and experimental results.

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“…The discrete-time model in a whole switching cycle can be derived by integrating the four equations in (5). Let the values of x at the beginning of the n-th and the (n ?…”

Section: Full Discrete-time Modelingmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Stability analysis of digitally controlled dual active bridge converters

Shi

Liu

et al. 2017

J. Mod. Power Syst. Clean Energy

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“…Recently, design considerations of multi-megawatts scale converters haven been studied in [6][7][8][9][10][11]. Especially, [9] introduced a constructed 2.2MVA prototype.…”

Section: Introductionmentioning

confidence: 99%

Geometry optimization and characterization of three-phase medium frequency transformer for 10kVA Isolated DC-DC converter

Lee

Vakil

Watson

et al. 2017

2017 IEEE Energy Conversion Congress and Exposition (ECCE)

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Abstract-Three-phase Dual Active Bridge converter is advisable for the High-power DC-DC conversion system. In the ac link, galvanically isolated transformer operated at a medium frequency range provides stepping up or down of the secondary bridge voltage. This paper provides a magnetic design optimization of the medium frequency transformer for maximizing its efficiency when excited by a non-sinusoidal waveform. In this paper, a mathematical design of a 10kVA non-sinusoidal transformer had been developed and validated using two-dimensional (2D) transient finite element analysis (FEA). The set of selected design variables is defined in order to enhance the power density and efficiency of the targeted transformer and an optimization is carried out. Finally, a 10kVA transformer is prototyped and the results of core losses for nonsinusoidal excitation is confirmed experimentally.

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“…Additionally, modular DC/DC converters offer more compact and lighter designs in situations where a single high-voltage converter with series connection of switches can be replaced with a set of low-voltage converter modules as being discussed in this paper. It will also solve the problem of additional snubber component and more complex gate drive units caused by the series connection of switches [5]. Compared to DC/DC converter based modular multilevel converter (MMC), reconfigurability and potential for interleaved control may make the ISIPOS DC/DC converter an attractive choice in medium-voltage applications.…”

Section: Introductionmentioning

confidence: 99%

Active power sharing in input-series-input-parallel output-series connected DC/DC converters

Lian

Adam

Holliday

et al. 2015

2015 IEEE Applied Power Electronics Conference and Exposition (APEC)

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This version is available at https://strathprints.strath.ac.uk/54270/ Strathprints is designed to allow users to access the research output of the University of Strathclyde. Unless otherwise explicitly stated on the manuscript, Copyright © and Moral Rights for the papers on this site are retained by the individual authors and/or other copyright owners. Please check the manuscript for details of any other licences that may have been applied. You may not engage in further distribution of the material for any profitmaking activities or any commercial gain. You may freely distribute both the url (https://strathprints.strath.ac.uk/) and the content of this paper for research or private study, educational, or not-for-profit purposes without prior permission or charge.Any correspondence concerning this service should be sent to the Strathprints administrator: strathprints@strath.ac.ukThe Strathprints institutional repository (https://strathprints.strath.ac.uk) is a digital archive of University of Strathclyde research outputs. It has been developed to disseminate open access research outputs, expose data about those outputs, and enable the management and persistent access to Strathclyde's intellectual output. Abstract-A high-capacity DC/DC converter with novel input-series-input-parallel output-series connection and with autonomous power sharing between modules is proposed. The proposed scheme is well suited for large-scale wind farm DC collection networks, as it avoids the charging current issues associated with its AC counterpart, and offers lower losses and reduced size and weight when a medium-or high-frequency transformer is used. Small-signal analysis is used to derive the control structures for the converter input and output stages. The proposed control scheme is validated through simulation and experimentation, including demonstration of autonomous power sharing between modules under several operating conditions.

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Comparison of the Modular Multilevel DC Converter and the Dual-Active Bridge Converter for Power Conversion in HVDC and MVDC Grids

Cited by 396 publications

References 38 publications

Stability analysis of digitally controlled dual active bridge converters

Stability analysis of digitally controlled dual active bridge converters

Geometry optimization and characterization of three-phase medium frequency transformer for 10kVA Isolated DC-DC converter

Active power sharing in input-series-input-parallel output-series connected DC/DC converters

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