A Homogeneous Model for Estimating Eddy-Current Losses in Wound Core of Multilevel-Circle Section

Gao, Shibin; Zhang, Chenqingyu; Zhou, Lijun; Lin, Tongyu; Zhou, Xiangyu; Cai, Junyi

doi:10.1109/tte.2020.2990573

Cited by 7 publications

(6 citation statements)

References 26 publications

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“…In formula (21), P h0 , P e0 , and P a0 are the measured hysteresis, eddy-current, and additional loss of the wound core; K h , K e , and K a are the hysteresis, eddy-current, and additional loss coefficients, respectively; β is the hysteresis engineering experience coefficient, which will change with the structure, capacity, and operating conditions of the transformer, and the value range is about 1.5-3.0. K h , β, and K a need to carry out multiple tests under different magnetic flux densities, and obtain reliable values with the help of mathematical methods of polynomial interpolation fitting; K e is closely related to the frequency f. It is directly calculated by formula (23), where δ 0 is the skin depth.…”

Section: Loss Measurement and Model Validationmentioning

confidence: 99%

“…Considering the decisive influence of boundary conditions on electromagnetic problems, a collapsing change will occur in the resolution of electromagnetic parameters using the above method blamed for more complicated boundary conditions. Gao [21] analytically solved the homogeneous distribution of eddy-current in circular-section wound cores at low and high frequencies using Bessel functions. However, due to the properties of Bessel functions, it cannot represent the uneven eddy current distribution in the core caused by the different magnetic circuit lengths of each layer of silicon steel sheets.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Electromagnetic anisotropic homogeneous model for eddy‐current field in single‐phase wound core

Zhou,

Li,

Xia

et al. 2023

High Voltage

Self Cite

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The analysis of the eddy‐current field in the wound core widely used in the field of transformer energy conservation is taken as the theme. Adopting the homogenisation idea to consider the unique geometry of the wound core and features of its equivalent multi‐stage circular cross‐section magnetic boundary, a homogeneous model consisting of a columnar material with continuous homogeneous electromagnetic anisotropy is established by deriving the Maxwell equations of the magnetic quasi‐static field in the columnar coordinate system. Finally, a homogeneous fine element model for the eddy‐current field in the wound core is established and the accuracy of the model has been verified by the test platform. The result shows that the homogeneous model can be effectively used for the analysis of the eddy‐current field in the wound core, and the error of calculating the eddy‐current loss under different excitation conditions is less than 6% under the premise of extremely saving the engineering calculation cost, which will help improve the operational performance of the wound core and contribute to the energy‐saving goal of the high‐voltage equipment.

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Section: Loss Measurement and Model Validationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Electromagnetic anisotropic homogeneous model for eddy‐current field in single‐phase wound core

Zhou,

Li,

Xia

et al. 2023

High Voltage

Self Cite

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“…To verify the correctness of the correction coefficients proposed in Section 3 and the accuracy of the correction model. The loss of the nanocrystalline core was calculated according to equation (10) which was considered the trapezoidal waveform rise time coefficients and the experimental measurements were analyzed by comparing them with the calculated results.…”

Section: Experimental Validation Of a Higher-order Loss Separation Modelmentioning

confidence: 99%

“…The loss mathematical model provides a microscopic analysis of the magnetization process, focusing on the factors that influence losses, including the classical Steinmetz empirical equation and the Bertotti loss separation model. Reference [10] describes the equivalent electromagnetic parameters of multi-stage circular crosssection winding cores at different frequencies. The Bertotti loss separation model has fewer parameters and clearer physical significance.…”

Section: Introductionmentioning

confidence: 99%

A Higher-Order Loss-Separation Model for Fast Estimation of Core Loss in High-Frequency Transformers

Wang,

Zhang,

Cai

et al. 2023

IEEE Access

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The core loss calculation is important for the design and performance evaluation of highfrequency transformers. It is related to the dimensions, temperature rises performance, and operating efficiency of transformer designs. Some scholars have examined the correlation between the characteristics of the core and losses, such as the core air gap length and the core structure; some investigations have also analyzed the effects of harmonics, distortion flux, and other factors on core losses. However, in reality, the core operating environment of high-frequency transformers is very complex, and achieving the required accuracy of loss model calculations is difficult. This paper discussed the insufficiency of the classical Bertotti loss separation model in estimating core loss under non-sinusoidal excitation of high-frequency transformers. Based on the derivation and modification of the classical loss model, the magnetic performance test platform of the nanocrystalline core material was established. In order to obtain a higherorder correction calculation method for the core loss of high-frequency transformers under trapezoidal wave excitation, the experimentally measured loss curves of nanocrystalline materials were further corrected. Finally, the accuracy of the correction model was verified by changing the loss results by varying the trapezoidal wave rise time constant.

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“…Harmonic current impact for distribution transformers is also studied for determining no-load losses [13]. Innovative methods for measuring no-load losses for different transformers is studied [14][15][16]. This type of core loss modelling is also vital for usage in precise applications like fault current limiters as studied in the Refs.…”

Section: Introductionmentioning

confidence: 99%

Modelling and Smart Analysis of an Inverter-Coupled Transformer for Renewable Applications

Chatterjee¹,

Das²,

Chatterjee³

2021

MMC_A

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This paper studies modelling and simulation for an inverter coupled transformer and the effects caused by source side harmonics on it. It also provides an insight to smart analysis and control of the same. These harmonics are present in most power electronic sources alike an inverter which is frequently used in renewable applications. The extended effect of source side harmonics on transformer primary can be shown on the transformer core hysteresis curve. The effect of harmonics is observed on the magnetization cycle with an electronic integrator circuit. The research uses a modified hysteresis model for the core with the effect of source harmonics taken in to consideration. The simplified hysteresis curve is plotted without removing the transformer from operation with measured data of voltages. Internet-of-things based smart control is proposed for remote operation and control of the transformer especially for use in remote microgrids and wind-farms. The proposed research is an operative tool for measurement and analysis of source harmonic effects on the core of the transformer. The outcome can be used for taking safety measures for extending the operating life of the transformer. The MATLAB/Simulink made simulations along with suitable experiments authenticate the proposed research.

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A Homogeneous Model for Estimating Eddy-Current Losses in Wound Core of Multilevel-Circle Section

Cited by 7 publications

References 26 publications

Electromagnetic anisotropic homogeneous model for eddy‐current field in single‐phase wound core

Electromagnetic anisotropic homogeneous model for eddy‐current field in single‐phase wound core

A Higher-Order Loss-Separation Model for Fast Estimation of Core Loss in High-Frequency Transformers

Modelling and Smart Analysis of an Inverter-Coupled Transformer for Renewable Applications

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