Research on Transformer Saturation Characteristics of Electric Locomotive Based on Flux - Current Loop Model

Huang, Zhihui; Jia, Zhijie; Li, Zhiyong

doi:10.1109/icpes47639.2019.9105614

Cited by 2 publications

(3 citation statements)

References 6 publications

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“…As the average saturation of the transformer decreases, the equivalent input impedance increases. There must be a 𝑘𝑘 � 𝑎𝑎 so that the equivalent output impedance is equal to the equivalent input impedance, as shown in formula (24).…”

Section: ) Stability Analysis Influenced By the Average Saturation Of...mentioning

confidence: 99%

“…According to formula (24) and formula (25), the system is stable when |𝐿𝐿(𝑠𝑠)| < 1 . Let 𝐴𝐴 = 20𝑙𝑙𝑐𝑐𝑙𝑙|𝐿𝐿(𝑠𝑠)| , combined with formula (1), formula (20) and formula (22), we can obtain:…”

Section: ) Stability Region Of Vehicle-grid Coupling Systemmentioning

confidence: 99%

“…In order to study the transient problem, some scholars have proposed a method to establish the flux current loop model. Based on the flux-current loop model, reference [23][24] constructed an equivalent model of electric locomotive when it passes the neutral-section, and analyzes the saturation characteristics of on-board transformers under different conditions. This model can reasonably explain the generation mechanism and attenuation characteristics of magnetizing inrush current and sympathetic inrush current, and provides a new idea for analyzing the LFO caused by electric locomotive passing the neutral-section.…”

Section: Introductionmentioning

confidence: 99%

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Research on Transient Low-Frequency Oscillation of Electrified Railway Vehicle-Grid Coupling System

Cao

et al. 2023

IEEE Access

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At the moment of electric locomotive passing the neutral-section, the voltage and current of traction network may have low-frequency oscillation (LFO), which will seriously affect the safe operation of the railway. Aiming at eliminating LFO, a modeling method of vehicle-grid coupling system based on flux-current theory is presented in this paper. In the model of electric locomotive, the transient current control strategy and magnetic saturation of on-board transformer are considered, and the equivalent model of excitation inductance of on-board transformer is established based on the flux-current theory. Using this model, based on the Middlebrook impedance ratio criterion, the stability region of vehicle-grid coupling system is analyzed under the influence of average saturation of on-board transformer and control parameters of electric locomotive. Simulation results and analysis are established to evaluate and verify the proposed modeling method of LFO. This work has the benefits of defining the opening and closing phase angle region of system stability as well as providing guidance to adaptively modify the control parameters to suppress the LFO.

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Section: ) Stability Analysis Influenced By the Average Saturation Of...mentioning

confidence: 99%

Section: ) Stability Region Of Vehicle-grid Coupling Systemmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Research on Transient Low-Frequency Oscillation of Electrified Railway Vehicle-Grid Coupling System

Cao

et al. 2023

IEEE Access

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Calculating the Inrush Current of Superconducting Transformers

Komarzyniec

2021

Energies

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Under certain circumstances, after connecting a superconducting transformer to the power network, a high value current may flow through its windings. This current can exceed the critical value of the superconductor many times and cause the windings to lose their superconductive state. Loss of superconductive state of the windings may result in thermal interruption of their continuity as a result of conduction of a current of very high density. The mathematical relationships used to calculate the inrush current of conventional transformers do not work well for the calculation of superconducting transformers. This is due to the properties of superconducting materials used in the windings, first of all to the stepwise changes of the windings’ resistance when exiting the superconducting state and when returning to this state. The article presents the mathematical dependencies allowing to calculate the pulse waveforms of the inrush current of these transformers are derived. Basic electrical circuit sizes are used in the calculations, making the calculations quick and easy. Using the formulas, calculations of the inrush current of 8.5 kVA and 13.5 kVA superconducting transformers. The results were verified with the results of the inrush current measurements, achieving good compliance.

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Research on Transformer Saturation Characteristics of Electric Locomotive Based on Flux - Current Loop Model

Cited by 2 publications

References 6 publications

Research on Transient Low-Frequency Oscillation of Electrified Railway Vehicle-Grid Coupling System

Research on Transient Low-Frequency Oscillation of Electrified Railway Vehicle-Grid Coupling System

Calculating the Inrush Current of Superconducting Transformers

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