New finite element techniques for skin effect problems

Konrad, A.; Chari, M.V.K.; Csendes, Z. J.

doi:10.1109/tmag.1982.1061859

Cited by 40 publications

(5 citation statements)

References 20 publications

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“…The FEM solves a set of Maxwell equations [66]- [69] in order to calculate the losses of the transformer for a given excitation and frequency. Domain decomposition along a timeaxis is used to perform transient analysis to solve all time steps simultaneously.…”

Section: B Calculation Of Transformer Lossesmentioning

confidence: 99%

FEA Based Transformer Loss Analysis for Dual Active Bridge DC–DC Converter Using Triple Phase Shift Modulation

Akbar

Hasan

Watson

et al. 2022

IEEE J. Emerg. Sel. Topics Power Electron.

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High frequency transformers are a key component of dual active bridge (DAB) dc-dc converters, providing isolation and voltage scaling. The losses in the transformer should be minimized to improve efficiency and extend lifetime. The existing research focuses on the optimization of design parameters, such as core material, cross sectional area and winding configuration to minimize losses. However, the transformer losses also depend on the harmonic content of the current as well as the design parameters and thus the efficiency can be further improved by selecting a modulation scheme which results in minimum current harmonics. This paper evaluates the effect of modulation schemes on the transformer losses of a DAB converter operating under triple phase shift (TPS) modulation by using finite element analysis. A comparison of losses under different modes of TPS modulation has been provided and it is proved that losses can be significantly reduced by selecting optimal modulation schemes. The experimental results performed on a 1kW DAB converter laboratory prototype are provided to validate the proposed work. Moreover, a generalized framework has been proposed to analyze and optimize transformer losses for isolated converters.Index Terms-Dual active bridge (DAB) dc-dc converter, finite element analysis (FEA), triple phase shift (TPS), winding loss.

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Section: B Calculation Of Transformer Lossesmentioning

confidence: 99%

FEA Based Transformer Loss Analysis for Dual Active Bridge DC–DC Converter Using Triple Phase Shift Modulation

Akbar

Hasan

Watson

et al. 2022

IEEE J. Emerg. Sel. Topics Power Electron.

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“…At the interface oil-air, the boundary condition is the one used by Ramaswamy and Jue [8]: (15) Where τ is the thermal process time constant (TC); Δt is the time difference; ρ is the density and μ is the dynamic viscosity.…”

Section: Heat Transfer Conventional Equationsmentioning

confidence: 99%

Design of a New Oil Spraying Device for Hot Spot Cooling in Large Scale Electric Power Transformers

Takami¹,

Mahmoudi²

2008

International Journal of Emerging Electric Power Systems

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Hot spot temperature (HST) is the most important parameter in the operation of power transformers. The HST has to be held under a prescribed limit. HST has a considerable effect on the insulation aging. Therefore detecting, monitoring and removing the HST could be a very important and necessary action for utilities. A new design of oil spraying and its effect, along with a thermal management in a transformer cooling system has been studied in this paper. The effect of oil fluid flow on the HST problem has been considered in this paper; and the calculations and simulation have been performed by Ants algorithm. The simulation results have been validated based on a 230/63/20 kV, 250MVA transformer at the Sari substation in Iran, and the results indicate that the new design could mitigate the limitations of transformer loading due to the HST problem. The Ants algorithm have been proposed and applied for accomplishing this task and to give an improved level of accuracy.

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“…In this article, we present an approach based on two-dimensional (2D) Finite Element Method (FEM). Several researchers previously discussed two-dimensional modelling, and it has a long history [7,8]. While FEM can be performed in three dimensions (3D), modeling in 3D with the necessary level of accuracy is extremely resource-intensive.…”

Section: Introductionmentioning

confidence: 99%

Simulation of Eddy Current Losses in Twisted Wires

Bakondi

2024

Period. Polytech. Elec. Eng. Comp. Sci.

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Twisted wires made of insulated strands, known as stranded conductors or litz wires, are used in various areas where the eddy current loss within the wire needs to be reduced. These areas include induction heating, resonance-based wireless energy transfer, and certain radio frequency devices. Some litz wires consist of thousands of individual conductor strands that are twisted together in multiple stages, creating a hierarchical bundle structure. Computer simulations (typically using finite element analysis) are used in the optimal design of the bundle structure. However, detailed three-dimensional models are computationally demanding. In this work, a two-dimensional finite element model was presented for simulating the eddy current loss in cables made of twisted wires. The key element of the model is considering the bundle structure (generally referred to as 3D configuration conditions) within the cross-sectional model domain. The accuracy of the proposed model is tested against 3D finite element simulations. The new method is shown to be accurate, and its computational cost is by orders of magnitude lower than that of 3D models.

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New finite element techniques for skin effect problems

Cited by 40 publications

References 20 publications

FEA Based Transformer Loss Analysis for Dual Active Bridge DC–DC Converter Using Triple Phase Shift Modulation

FEA Based Transformer Loss Analysis for Dual Active Bridge DC–DC Converter Using Triple Phase Shift Modulation

Design of a New Oil Spraying Device for Hot Spot Cooling in Large Scale Electric Power Transformers

Simulation of Eddy Current Losses in Twisted Wires

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