Predicting Iron Losses in Soft Magnetic Materials Under DC Bias Conditions Based on Steinmetz Premagnetization Graph

Chen, Wei; Huang, Xiaoyan; Cao, Shihou; Ma, Jien; Fang, Youtong

doi:10.1109/tmag.2015.2514239

Cited by 16 publications

(4 citation statements)

References 7 publications

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“…frequency f and peak flux density B. Unfortunately, a single three-parameter Steinmetzs equation is inadequate for accurate core loss prediction over a large range of frequency and flux density values [16]as well as describing losses using square waveform excitation with varying duty cycle. To reach an analytical formulation the simplest form of loss table used to obtain single analytical formulation for the optimization algorithm.…”

Section: Transformer Loss Structurementioning

confidence: 99%

Power Supply Design Considerations For 400Hz Aircraft Applications

Ahmad

Kyyrä

Mäkelä³

2020

2020 22nd European Conference on Power Electronics and Applications (EPE'20 ECCE Europe)

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In this study a 5kW power supply for aircraft applications has been designed. Boost type power factor correction topology Delta rectifier complies with military standards of conducted emissions and is selected as a front-end rectifier for 400 Hz mains power supply. For isolation and output Dc voltage regulation a full bridge Dc-Dc converter with 99% efficient high frequency transformer has been designed. Reducing Winding Losses Key to reducing windings losses is the adjustment of high frequency eddy current effects, this is accomplished by having thinner foil and extensive interleaving of the transformer windings [19]. Results from MATLAB optimization algorithm are shown in Fig. 12 and Fig. 13. Reducing Core Losses Eddy current losses in the core increase as the frequency is increased in a transformer core this phenomenon is also captured by the curve fitted Steinmetz equation.

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Section: Transformer Loss Structurementioning

confidence: 99%

Power Supply Design Considerations For 400Hz Aircraft Applications

Ahmad

Kyyrä

Mäkelä³

2020

2020 22nd European Conference on Power Electronics and Applications (EPE'20 ECCE Europe)

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“…Conventionally, the core loss is predicted by using empirical formulas based on the Steinmetz equation (SE) with parameters identified from experimental measurements under sinusoidal excitations. Although the modified empirical equations proposed by the existing works 7 – 11 provide better accuracy in core loss estimation, they are based on experimental measurements. While DC biased magnetization significantly affects and exacerbates the core loss, it is hard to obtain all of hysteresis loops and core loss under different DC biased conditions to fit the Steinmetz equation.…”

Section: Introductionmentioning

confidence: 99%

A comparative study of J–A and Preisach improved models for core loss calculation under DC bias

Li,

Luo

2024

Sci Rep

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Power transformer is widely used in the power system with the rapid development of the power converters connected to the grid. When a transformer operates under DC bias conditions, its iron core loss increases significantly, causing local overheating and threatening the proper operation of the transformer. However, there are persistent difficulties in accurately assessing the core loss when the induction waveform is influenced by a DC bias. This paper first proposes improvements to the J–A and Preisach models to evaluate the core loss of the iron core under DC bias. Additionally, we incorporate the hysteresis models into the finite element method (FEM) by modifying the fundamental constitutive equations in the FEM model in order to perform a precise core loss/distribution calculation. To verify the accuracy of prediction, a transformer prototype with a laminated core is developed. The improved J–A-FEM and Preisach-FEM models were directly compared in terms of calculation accuracy, numerical implementation, and computational burden.

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“…DC magnetic bias refers to the occurrence of a DC component in the excitation current of the transformer, which leads to half-circle magnetic saturation of the iron core of transformer and a series of electromagnetic effects caused by this. The factors that cause the DC bias of the transformer mainly include the "geomagnetic storm" and the DC transmission system [7][8][9][10]. The DC bias brings a series of undesirable consequences to the transformer in normal operation, such as the transformer's excitation current distortion, increased noise and vibration, voltage waveform distortion, the generation of harmonics, the increase of reactive power loss and the malfunction of relay protection devices, etc., seriously affect the safe and stable operation of the transformer and its associated power system [6].…”

Section: Introductionmentioning

confidence: 99%

Research and Identification of DC Magnetic Bias of Single-Phase Transformer

Duan

Yuan

2021

Lecture Notes in Electrical Engineering

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In recent years, the phenomenon of DC bias of transformer in the AC power grid has occurred from time to time. DC bias is an abnormal working state of transformer. It is of great significance to study the DC bias characteristics of transformer. Based on PSCAD software, this paper studies the single-phase transformer that is easily affected by DC bias. Through the establishment of a single-phase dual-winding transformer simulation model, the influence of DC bias on the transformer is studied, including the change of excitation current, magnetization curve of iron core, each harmonic and total harmonic distortion rate under different DC bias conditions. Finally, based on the Discrete Wavelet Transform (DWT), the identification of the low-frequency components in the excitation current is studied, which can be used as an effective judgment for the DC bias fault of the transformer according to the characteristics of the low-frequency components, and the expected effect is achieved.

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Predicting Iron Losses in Soft Magnetic Materials Under DC Bias Conditions Based on Steinmetz Premagnetization Graph

Cited by 16 publications

References 7 publications

Power Supply Design Considerations For 400Hz Aircraft Applications

Power Supply Design Considerations For 400Hz Aircraft Applications

A comparative study of J–A and Preisach improved models for core loss calculation under DC bias

Research and Identification of DC Magnetic Bias of Single-Phase Transformer

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