Experimentally Validated Method to Measure the &lt;inline-formula&gt; &lt;tex-math notation="LaTeX"&gt;${\lambda}$ &lt;/tex-math&gt; &lt;/inline-formula&gt;–&lt;inline-formula&gt; &lt;tex-math notation="LaTeX"&gt;${i}$ &lt;/tex-math&gt; &lt;/inline-formula&gt; Characteristics of Asymmetric Three-Phase Transformers

Wu, Qiong; Hong, Tianqi; Jazebi, Saeed; León, Francisco de

doi:10.1109/tmag.2019.2897962

Cited by 5 publications

(2 citation statements)

References 31 publications

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“…According to the authors, the model can be used for transient studies such as inrush current and ferroresonance. Wu et al 16 proposed a novel method to calculate the major hysteresis loop of a three-phase transformer; the necessary information was measured by standard tests at the transformer terminals and also some digital instrumentation. The two Y-Y and Y-D connections were illustrated in this paper.…”

Section: Introductionmentioning

confidence: 99%

Modified method for transformer magnetizing characteristic computation and point‐on‐wave control switching for inrush current mitigation

Yahiou

Bayadi

Babes

2019

Circuit Theory & Apps

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Summary This paper proposes a new model for the low‐frequency transient analysis of a transformer, with a modified equation for calculation of the flux‐current characteristic representing the saturation inductance of the transformer. The model is based on the V‐I (voltage‐current) no‐load curves and uses the no‐load reactive power losses. To validate the model, it was used to simulate the no‐load magnetizing current in steady‐state condition, as well as the transient inrush current at network frequency. Evaluation was done both by comparing the simulation results obtained with the proposed model and those available in the relevant literature, and by practical measurements. The experimental results presented in this paper were obtained via a laboratory setup and a data acquisition system based on the dSPACE board 1104. Moreover, a control switching to mitigate the transient inrush current in a transformer was developed and applied experimentally in the laboratory and also in the simulations. This control strategy was performed by taking into account the residual flux at the opening instant of the related circuit breaker. A comparative study was carried out showing the validity of the proposed model and the mitigation technique.

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Section: Introductionmentioning

confidence: 99%

Modified method for transformer magnetizing characteristic computation and point‐on‐wave control switching for inrush current mitigation

Yahiou

Bayadi

Babes

2019

Circuit Theory & Apps

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“…In [23], [24] and [25], methods were proposed to simplify the detailed models to make them more suitable in power system analyses. In case a detailed model is not available, some measurement techniques can be used to establish the model in time or frequency domain [26]- [31].…”

mentioning

confidence: 99%

Lagrangian Model of an Isolated DC-DC Converter With a 3-Phase Medium Frequency Transformer Accounting Magnetic Cross Saturation

Dworakowski

Wilk

Michna

et al. 2021

IEEE Trans. Power Delivery

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This article presents a nonlinear equivalent circuit model of an isolated dc-dc converter with a 3-phase medium frequency transformer. The model takes into account the magnetic cross saturation of the 3-phase core-type magnetic circuit. The model is suitable in detailed electromagnetic transient simulations of power systems involving isolated dc-dc converters. The model is developed using the Lagrange energy method. It involves a matrix of dynamic inductances containing a nonlinear term resulting from core magnetization and a linear term resulting from leakage flux. The model parameters are determined based on a series of magnetostatic finite element method simulations. This approach is convenient when applied to high power transformers offering a limited characterization effort, or if the transformer prototype does not exist. The experimental validation performed on a novel 3-phase MFT prototype in a 100 kW 1.2 kV 20 kHz dual active bridge converter has proved the validity of the model and model parameters. The no-load steady-state and inrush tests and the full-load test show a very good fit between the simulated and experimentally measured waveforms. The comparison with a classical simplified model neglecting magnetic cross saturation shows a significant difference in the no-load inrush test.

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Experimentally Validated Extended Kalman Filter Approach for Geomagnetically Induced Current Measurement

Behdani

Tajdinian

Allahbakhshi

et al. 2022

IEEE Trans. Ind. Electron.

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Geomagnetically induced currents (GICs) are referred to as the quasi-dc current flows in power networks, driven by complex space weather-related phenomena. Such currents are a potential threat to the power delivery capability of electrical grids. To mitigate the detrimental impacts of GICs on critical infrastructures, the GICs should be monitored in power systems. Being inherently dc from the power frequency point of view, the components of GICs are, however, challenging and costly to monitor in ac power grids. This article puts forward a novel methodology for the realtime estimation of GICs in power transformers. Such aim is attained by means of an extended Kalman filter (EKF)based approach, mounted on the nonlinear state-space model of the transformer, whose parameters can be derived from standard tests. The proposed EKF-based algorithm employs the available measurements for the transformer differential protection. The proposed approach, relying on the differential current, can properly deal with the external sources of interference like harmonic excitation and loading. The EKF-based estimator presented is validated by simulation and experimental data. The results verify the ability of the proposed approach to robustly estimate the GIC level during various operating conditions. Index Terms-Extended Kalman filter, geomagnetically induced current, power transformer. NOMENCLATURE i acAC component of differential current.

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Experimentally Validated Method to Measure the <inline-formula> <tex-math notation="LaTeX">${\lambda}$ </tex-math> </inline-formula>–<inline-formula> <tex-math notation="LaTeX">${i}$ </tex-math> </inline-formula> Characteristics of Asymmetric Three-Phase Transformers

Cited by 5 publications

References 31 publications

Modified method for transformer magnetizing characteristic computation and point‐on‐wave control switching for inrush current mitigation

Modified method for transformer magnetizing characteristic computation and point‐on‐wave control switching for inrush current mitigation

Lagrangian Model of an Isolated DC-DC Converter With a 3-Phase Medium Frequency Transformer Accounting Magnetic Cross Saturation

Experimentally Validated Extended Kalman Filter Approach for Geomagnetically Induced Current Measurement

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