Modeling and Design of High-Power Enhanced Leakage-Inductance-Integrated Medium-Frequency Transformers for DAB Converters

Zhang, Xinsheng; Xiao, Fei; Wang, Ruitian; Kang, Wei; Yang, Beichao

doi:10.3390/en15041361

Cited by 8 publications

(6 citation statements)

References 21 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In [27], the magnetizing inductance is considered the first step for the design process of HFT. In [28], The leakage inductance is first investigated, and then the remaining parameters of HFT are given.…”

Section: Transformer Modelingmentioning

confidence: 99%

High Frequency Transformers for Solid-State Transformer Applications

et al. 2023

View full text Add to dashboard Cite

This paper focuses on the study of the high frequency transformer incorporated in solid- state transformers, specifically on the development of the steps that enable the design of an optimized high frequency transformer and its equivalent model based on the desired characteristics. The impact of operating a transformer at high frequency and the respective solutions that allow this impact to be reduced are analyzed, alongside the numerous advantages that the utilization of these transformers has over traditional 50/60 Hz transformers. Furthermore, the power scheme of the solid-state transformer is outlined, focusing on the power converters, which are immediately before and after the high frequency transformer (HFT). We also investigate a control technique that allows for correct operation and the existence of power bidirectionality. In a novel approach, this paper demonstrates the systematic steps for designing an HFT according to the desired specifications of each given project, helping students and engineers achieve their objectives in power-electronic applications. Moreover, this paper aims at increasing the knowledge of this area of power electronics and facilitating the development of new topologies with high power density, which are very important to the integration of renewable power sources and other applications. Finally, a simulation is presented to validate a high frequency transformer and its control technique.

show abstract

Section: Transformer Modelingmentioning

confidence: 99%

High Frequency Transformers for Solid-State Transformer Applications

et al. 2023

View full text Add to dashboard Cite

show abstract

“…To get a comprehensible analytical expression for the leakage inductance, it is assumed that U 1,p,M ≈ U 1,s,M where U 1,p,M and U 1,s,M are given in (22) will result in L σ = 0. This means that there is no L σ ∈ R + where the currents in the points {P 1 , P 2 , P 3 } intersect with the current in the point P 4 .…”

Section: Appendix A2 Solving Outer Optimizationmentioning

confidence: 99%

“…On the other hand, the MFT is not an off-the-shelf product and should be designed for the specific application to have high power density and efficiency. The design optimization of the MFT can be combined with the converter design [14] or performed stand-alone with the specifications imposed from the converter side [15][16][17][18][19][20][21][22]. The MFT's leakage inductance directly impacts the current waveforms, the power factor, and the converter's performance [1].…”

Section: Introductionmentioning

confidence: 99%

“…The MFT's leakage inductance directly impacts the current waveforms, the power factor, and the converter's performance [1]. Therefore, it can be considered to be a design requirement for MFT optimization [15][16][17][18][19][20][21][22][23][24][25][26]. The value of desired leakage inductance is used as an input for the optimization of an MFT in [15][16][17][18][19][20].…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Multilevel Dual Active Bridge Leakage Inductance Selection for Various DC-Link Voltage Spans

2023

View full text Add to dashboard Cite

The leakage inductance of the transformer in a dual active bridge (DAB) dc–dc converter directly impacts the ac current waveforms and the power factor; thus, it can be considered a design requirement for the transformer. In the existing literature, a choice is made to either ensure soft switching in nominal power or to minimize the RMS current of the transformer. The inductance is typically obtained using optimization procedures. Implementing these optimizations is time-consuming, which can be avoided if a closed-form equation is derived for the optimum leakage inductance. In this paper, analytical formulas are derived to estimate the desired leakage inductance such that the highest RMS value of the current in the operation region of a DAB is kept to its minimum value. The accuracy and sensitivity of the analytical solutions are evaluated. It is shown that in a large design domain, the solution for the YY-connected MFT has a less than 3% error compared to the results obtained from an optimization engine. As an example of the importance of selecting the leakage inductance correctly, it is shown that for 11% deviations in the dc link voltages, a 10% deviation from the desired leakage inductance value can cause 2% higher RMS currents in the converter.

show abstract

“…Therefore, these studies do not suit the electromagnetic design of the compensation choke. Several other works related to the topic are worth mentioning, e.g., [14][15][16][17][18][19][20][21][22][23]; however, their application is also dedicated to power electronics rather than energetics. As far as we know, studies on this topic have still not been completed.…”

Section: Introductionmentioning

confidence: 99%

Analytical Method for Designing Three-Phase Air-Gapped Compensation Choke

et al. 2022

View full text Add to dashboard Cite

The compensating choke plays an important role in many high-power industrial applications with reactive power compensation. Due to the high number of devices installed every year and the EU’s efforts to reduce the energy demands of our society, it is advisable to maximize the efficiency of these devices. Due to the non-linearity of the magnetic core, the requirement of a linear operating characteristic, and the presence of a distributed air gap, this is a difficult task, with various technical challenges. This paper presents an analytical method for the electromagnetic design of a three-phase compensating choke with an air-gapped core and a flat load characteristic. The design method considers the fringing magnetic fields and the current-density dimensioning based on an advanced analytical thermal model. The proposed method is based on the use of existing analytical procedures; however, optimization was conducted to achieve a trade-off between the core and the I2R losses to manipulate the efficiency and the weight and identify optimization possibilities. The presented method was verified by the finite element method (FEM) using the engineering-simulation software, ANSYS.

show abstract

Modeling and Design of High-Power Enhanced Leakage-Inductance-Integrated Medium-Frequency Transformers for DAB Converters

Cited by 8 publications

References 21 publications

High Frequency Transformers for Solid-State Transformer Applications

High Frequency Transformers for Solid-State Transformer Applications

Multilevel Dual Active Bridge Leakage Inductance Selection for Various DC-Link Voltage Spans

Analytical Method for Designing Three-Phase Air-Gapped Compensation Choke

Contact Info

Product

Resources

About