An Improved Design Procedure for a 10 kHz, 10 kW Medium-Frequency Transformer Considering Insulation Breakdown Strength and Structure Optimization

Wang, Weiwang; Liu, Ying; He, Jiankang; Ma, Diqin; Hu, Lai; Yu, Shixin; Li, Shengtao; Liu, Jinjun

doi:10.1109/jestpe.2022.3155751

Cited by 16 publications

(5 citation statements)

References 61 publications

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“…The surface potential near the electrode/ dielectric interface increases with the increase in polarization voltage. Figure 13d shows the charge density curve calculated using Equation (10). The homogeneous charge density near the [190] Copyright 2012, American Institute of Physics.…”

Section: Charge Characteristics At Electrode/dielectric Interfacementioning

confidence: 99%

“…Interfaces created by solid–solid and solid–liquid polymer dielectrics have been widely used in advanced electronic devices and power equipment ( Figure ), [ 1–5 ] including multi‐layered dielectric contact regions in high voltage cables, [ 6–9 ] winding and dielectric contact regions in solid‐state transformers, [ 10 ] and filler/matrix contacts in composite materials for electronic device packaging. [ 11 ] Under the electric field, the interface charges are formed within various regions, indicating an improvement in electro‐acoustic, [ 12 ] electro‐optic, [ 13 ] and electro‐thermo [ 14 ] conversions in the flexible transducers.…”

Section: Introductionmentioning

confidence: 99%

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Interface Charge Characteristics in Polymer Dielectric Contacts: Analysis of Acoustic Approach and Probe Microscopy

Wang

et al. 2023

Adv Materials Inter

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Interfaces are essential components in polymer contact systems, which widely exist in electronic devices and power equipment. Interface charge originating from the mismatch of the electronic structure in interfaces is one of the key issues to modify the device performance due to its multifunctional migration and accumulation behaviors. Hence, the detection and analysis of the interface charge characteristics are of great importance to deeply understand the polymer contact system in various devices. This paper presents an overview of recent research progress in the interface charge properties at dielectric interfaces. Based on the theoretical analysis of the MWS polarization and electronic localized states, two typical approaches of discussing the interface charges from micrometer to millimeter are mainly studied. Acoustic method is prevalent in detecting the space charge in various dielectrics. However, owing to its limited resolution (several µm), it is difficult to clarify the charge distributions at the interface with a micro‐scale. Probe microscopy presents a promising technique due to its flexible surface potential detection at a submicron scale. The challenges and prospects of acoustic and probe microscopy methods are discussed in this paper. The advanced techniques of interface charges can promote the development of new energy electronic devices.

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Section: Charge Characteristics At Electrode/dielectric Interfacementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Interface Charge Characteristics in Polymer Dielectric Contacts: Analysis of Acoustic Approach and Probe Microscopy

Wang

et al. 2023

Adv Materials Inter

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“…Compared to conventional transformers, the ICT exhibits a significant distinction: its magnetic cores are segmented by insulating sheets with a high dielectric capability. This segmentation leads to a considerable amount of magnetic flux leakage, resulting in two unfavorable consequences: (1) a reduction in the induced voltage of the secondary windings; and (2) an increase in leakage inductance and output impedance [10]. The voltage doubling rectifier circuit converts the three-phase AC output from the secondary windings into DC.…”

Section: Introductionmentioning

confidence: 99%

“…impedance [10]. The voltage doubling rectifier circuit converts the three-phase AC output from the secondary windings into DC.…”

Section: Introductionmentioning

confidence: 99%

Research on Voltage Compensation Methods and Optimization Algorithm for Insulated Core Transformer High-Voltage Power Supply

Yang,

Liu,

Yang

2024

Energies

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The insulated core transformer (ICT) power supply is widely employed in electron beam accelerators (EBAs) due to its high power, heightened efficiency, and stable operation. However, the segmented-core structure of the ICT power supply increases magnetic leakage, which leads to it adversely affecting the consistency of the output voltages in the rectifier stages. Currently, numerous studies focus on stage voltage compensation, including turns compensation, capacitor compensation, dummy primary winding compensation, and full-parameter compensation. This paper presents a unified simulation model and an improved gradient-based genetic algorithm, which can also optimize the parameters of the four compensation methods. Based on this, the performance of the power supply using the four compensation methods under different ICT energy levels and power supply requirements is studied, and the selection suggestions are given. This work fills the gap in the performance comparison and application research of various compensation methods.

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“…In [9], the characteristic parameters of partial discharge in transformer oil-paper insulation dielectric under fundamental frequency voltage superimposed on harmonic voltage with different frequencies, proportions, and phases are analysed. In [10], the partial discharge experiments on the air gap defect model of oil-paper insulation under DC voltage superposed with 6th, 12th, and 18th harmonic voltage. It is found that under high-frequency voltage space charges are easy to accumulate, and the number of partial discharges increases.…”

Section: Introductionmentioning

confidence: 99%

Discharge Characteristics of Needle Plate Electrode in Transformer Oil Under Low-frequency AC Voltage

Liang,

Wu,

et al. 2023

J. Phys.: Conf. Ser.

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Low-frequency transformer is the key equipment of flexible low-frequency AC transmission systems for offshore wind power. As the low-frequency voltage is applied, the transformer has significantly different insulation characteristics from those of the conventional transformer, it is necessary to study the typical characteristics of partial discharge of oil-paper insulation under such voltage. In this dissertation, the characteristics of discharge of needle plate electrodes in transformer oil under power frequency to low-frequency voltage are experimentally researched by adopting the pulse current method, and the discharge statistics, discharge atlas as well as feature parameters are analysed. With the decreasing of voltage frequency, the inception voltage (IV) value of partial discharge slightly increases, the extinction voltage (EV) phases of positive half-cycle (PHC) voltage waveform, as well as negative half-cycle (NHC) voltage waveform appear earlier, and the maximum discharge (MD), average discharge (AD), and pulse repetition rate (PRR) all show a downward trend.

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An Improved Design Procedure for a 10 kHz, 10 kW Medium-Frequency Transformer Considering Insulation Breakdown Strength and Structure Optimization

Cited by 16 publications

References 61 publications

Interface Charge Characteristics in Polymer Dielectric Contacts: Analysis of Acoustic Approach and Probe Microscopy

Interface Charge Characteristics in Polymer Dielectric Contacts: Analysis of Acoustic Approach and Probe Microscopy

Research on Voltage Compensation Methods and Optimization Algorithm for Insulated Core Transformer High-Voltage Power Supply

Discharge Characteristics of Needle Plate Electrode in Transformer Oil Under Low-frequency AC Voltage

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