Iron Losses in a Medium-Frequency Transformer Operated in a High-Power DC–DC Converter

Soltau, Nils; Eggers, Daniel; Hameyer, Kay; Doncker, Rik W. De

doi:10.1109/tmag.2013.2283733

Cited by 81 publications

(35 citation statements)

References 12 publications

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“…The latter are estimated by applying the improved generalized Steinmetz equation (iGSE). To calculate the losses, the required Steinmetz parameter of the core material (0.18 mm thick silicon steel) can be found in [14]. Since litz wire is considered, losses due to skin and proximity effects are neglected.…”

Section: Medium-frequency Transformermentioning

confidence: 99%

Analysis of wind turbines connected to medium-voltage DC grids

Stieneker

Averous

Soltau

et al. 2014

2014 16th European Conference on Power Electronics and Applications

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The transmission and distribution of electrical energy with direct current (dc) is a promising alternative to established alternating-current (ac) systems. Higher efficiencies, fewer lossy pulse-width modulated converters and smaller transformers reduce operation and investment costs. Moreover, dc collector grids within wind parks leads to benefits for harvesting electrical energy. In this paper, a modular dual-active bridge (DAB) dc-dc converter system for integrating renewable energy sources, especially wind turbines (WT), into medium-voltage dc (MVDC) grids is presented and analyzed. Also, the design and efficiency of the machine-side power converter of the WT for dc grids are discussed.

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Section: Medium-frequency Transformermentioning

confidence: 99%

Analysis of wind turbines connected to medium-voltage DC grids

Stieneker

Averous

Soltau

et al. 2014

2014 16th European Conference on Power Electronics and Applications

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“…More recently, in [18], estimations of core losses with non-sinusoidal excitation in medium/high frequency transformer are introduced. This paper explores design & optimisation and performance evaluations, for high efficiency, of a three-phase transformer for 10kVA rated 3DAB converter.…”

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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“…ABB [3] and GE [4] have recently developed high power generators for rated voltage of 3.3kV. 3DAB Converter which is suitable for high-power application has been studied in [5,6]. The 3DAB Converter offers a higher power capability and smaller passive filtering parts compared to single-phase dual active bridge (1DAB).…”

Section: Introductionmentioning

confidence: 99%

“…Design of medium/high frequency transformer is presented in [11][12][13][14][15][16], however, they only consider the design procedure of single-phase transformer. More recently, design of threephase transformer for 3DAB converter topology with the focus on losses has been developed [6,16]. The work presented here not only considers power loss analysis but also carries out optimization, for maximizing the efficiency, of three-phase MF transformer operating at 1kHz.…”

Section: Introductionmentioning

confidence: 99%

Design Optimization of a High-Power Transformer for Three-Phase Dual Active Bridge DC-DC Converter for MVDC Grids

Lee¹,

Vakil²,

Feldman³

et al. 2016

8th IET International Conference on Power Electronics, Machines and Drives (PEMD 2016)

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High-power DC-DC converter will be one of the essential technologies for the future DC grids. Especially, a three-phase dual-active bridge DC-DC (3DAB) Converter is highly suitable for high-power DC systems. Key component within this converter is the high power transformer operated at a medium frequency (MF) range. The design and optimization of this key component is presented in this paper. The transformer provides galvanic isolation from low voltage level to medium level or high voltage level and provides stepping up or down of the output (secondary) voltage. At first, a design of three-phase medium frequency transformer is developed. The designed transformer is then validated using two-dimensional (2D) transient finite element analysis (FEA) and performance under the non-sinusoidal excitation is determined. After that, the optimization is carried out, for the set of selected design variables, in order to enhance the power density and efficiency of the targeted transformer. Finally, the performance of the full system, 3DAB converter, is determined using the parameters of optimized transformer. Also, two different rated input voltages for 4MW/1kHz threephase transformer are considered and analysed in this paper.

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Iron Losses in a Medium-Frequency Transformer Operated in a High-Power DC–DC Converter

Cited by 81 publications

References 12 publications

Analysis of wind turbines connected to medium-voltage DC grids

Analysis of wind turbines connected to medium-voltage DC grids

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

Design Optimization of a High-Power Transformer for Three-Phase Dual Active Bridge DC-DC Converter for MVDC Grids

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