Journal ArticleDOI
Comparison of the Modular Multilevel DC Converter and the Dual-Active Bridge Converter for Power Conversion in HVDC and MVDC Grids
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TLDR
In this article, the authors compared the performance of the modular multilevel dc converter (M2DC) and the three-phase dual-active bridge converter (DAB) in terms of efficiency, amount of semiconductor devices, and expense on capacitive storage and magnetic components.Abstract:
It is expected that in the near future the use of high-voltage dc (HVDC) transmission and medium-voltage dc (MVDC) distribution technology will expand. This development is driven by the growing share of electrical power generation by renewable energy sources that are located far from load centers and the increased use of distributed power generators in the distribution grid. Power converters that transfer the electric energy between voltage levels and control the power flow in dc grids will be key components in these systems. The recently presented modular multilevel dc converter (M2DC) and the three-phase dual-active bridge converter (DAB) are benchmarked for this task. Three scenarios are examined: a 15 MW converter for power conversion from an HVDC grid to an MVDC grid of a university campus, a gigawatt converter for feeding the energy from an MVDC collector grid of a wind farm into the HVDC grid, and a converter that acts as a power controller between two HVDC grids with the same nominal voltage level. The operation and degrees of freedom of the M2DC are investigated in detail aiming for an optimal design of this converter. The M2DC and the DAB converter are thoroughly compared for the given scenarios in terms of efficiency, amount of semiconductor devices, and expense on capacitive storage and magnetic components.read more
Citations
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Journal ArticleDOI
A Review of Power Electronics for Grid Connection of Utility-Scale Battery Energy Storage Systems
Guishi Wang,Georgios Konstantinou,Christopher D. Townsend,Josep Pou,Sergio Vazquez,Georgios Demetriades,Vassilios G. Agelidis +6 more
TL;DR: In this paper, the authors present a comprehensive review of power electronics (PE) topologies for utility BESS that have been proposed either within industry or the academic literature, and a comparison of the presently most commercially viable topologies is conducted in terms of estimated power conversion efficiency and relative cost.
Journal ArticleDOI
Overview and Comparison of Modulation and Control Strategies for a Nonresonant Single-Phase Dual-Active-Bridge DC–DC Converter
Nie Hou,Yun Wei Li +1 more
TL;DR: To improve both steady-state and transient performances, a combination approach to optimize both the efficiency and dynamics for an NSDAB dc–dc converter based on the reviewed methods is presented.
Journal ArticleDOI
Review of dc-dc converters for multi-terminal HVDC transmission networks
TL;DR: In this paper, the authors present a comprehensive review of high-power dc-dc converters for high-voltage direct current (HVDC) transmission systems, with emphasis on the most promising topologies from established and emerging DC-DC converters.
Journal ArticleDOI
Overview of DC–DC Converters Dedicated to HVdc Grids
TL;DR: In this paper, an overview of the dc-dc power converters dedicated to HVDC is presented, and two large families are established: those which provide galvanic isolation, and those which do not.
Journal ArticleDOI
Analysis and Design of a Modular Multilevel Converter With Trapezoidal Modulation for Medium and High Voltage DC-DC Transformers
TL;DR: In this article, a half-bridge chopper cell was used for dc-dc transformer with modular multilevel converters to avoid the use of standard bulky modular multi-level bridges.
References
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TL;DR: In this paper, three DC/DC converter topologies suitable for high power-density high power applications are presented, which operate in a soft-switched manner, making possible a reduction in device switching losses and an increase in switching frequency.
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Accurate prediction of ferrite core loss with nonsinusoidal waveforms using only Steinmetz parameters
TL;DR: An improved calculation of ferrite core loss for nonsinusoidal waveforms separates a flux trajectory into major and minor loops via a new recursive algorithm that is highly accurate and outperforms two previous methods for measured data.
Journal ArticleDOI
The Economies of Scale
TL;DR: The theory of the economies of scale as discussed by the authors is a crucial element of the economic theory of social organization, for it underlies every question of market organization and the role of governmental control over economic life.