scholarly journals Design and Prototyping Medium-Frequency Transformers Featuring a Nanocrystalline Core for DC–DC Converters

Energies ◽  
2018 ◽  
Vol 11 (8) ◽  
pp. 2081 ◽  
Author(s):  
Dante Ruiz-Robles ◽  
Vicente Venegas-Rebollar ◽  
Adolfo Anaya-Ruiz ◽  
Edgar Moreno-Goytia ◽  
Juan Rodríguez-Rodríguez
Keyword(s):  
Power Plants ◽  
Medium Frequency ◽  
Solid State Transformers ◽  
Design Procedures ◽  
The Core ◽  
Dual Active Bridge ◽  
Product Technique ◽  
Core Losses ◽  
Full Analysis ◽  
Area Product

Medium frequency transformers (MFTs) are a key component of DC–DC dual active bridge (DAB)-type converters. These technologies are becoming a quintessential part of renewable energy solutions, such as photovoltaic systems and wind energy power plants, as well as in modern power grid interfaces functioning as solid-state transformers in smart-grid environments. The weight and physical dimensions of an MFT are key data for the design of these devices. The size of an MFT is reduced by increasing its operating frequency. This reduction implicates higher power density through the transformer windings, as well as other design requirements distinct to those used for conventional 60/50 Hz transformers; therefore, new MFT design procedures are needed. This paper introduces a novel methodology for designing MFTs, using nanocrystalline cores, and tests it using an MFT–DAB lab prototype. Different to other MFT design procedures, this new design approach uses a modified version of the area-product technique, which consists of smartly modifying the core losses computation, and includes nanocrystalline cores. The core losses computation is supported by a full analysis of the dispersion inductance. For purposes of validation, a model MFT connected to a DAB converter is simulated in Matlab-Simulink (The MathWorks, v2014a, Mexico City, Mexico). In addition, a MFT–DAB lab prototype (1 kVA at 5 kHz) is implemented to experimentally probe further the validity of the methodology just proposed. These results demonstrate that the analytic calculations results match those obtained from simulations and lab experiments. In all cases, the efficiency of the MFT is greater than 99%.

scholarly journals An Experimental Comparison of the Effects of Nanocrystalline Core Geometry on the Performance and Dispersion Inductance of the MFTs Applied in DC-DC Converters

Electronics ◽  
2020 ◽  
Vol 9 (3) ◽  
pp. 453
Author(s):  
Dante Ruiz-Robles ◽  
Carlos Figueroa-Barrera ◽  
Edgar L. Moreno-Goytia ◽  
Vicente Venegas-Rebollar
Keyword(s):  
Power Density ◽  
High Efficiency ◽  
Experimental Comparison ◽  
Experimental Development ◽  
Solid State Transformers ◽  
The Core ◽  
New Information ◽  
Core Losses ◽  
Analysis Design ◽  
And Performance

The development of Medium Frequency Transformers (MFTs) from a novel perspective is essential for the advancement of today´s various relevant applications such as the emerging solid-state transformers, along with interfaces for the interconnection of photovoltaic parks and electric vehicles. The analysis, design and implementation of MFTs pursuing the achievement of characteristics such as high power density, high efficiency, and a specific dispersion inductance is a key goal for designers. There are several parameters and design methods that influence the final performance of an MFT, such as the geometry and material of the core. The advantages/disadvantages of each material/geometry combination, about the dispersion inductance for instance, are not well known, even considering a single material but various geometries. This paper presents the analysis, design and experimental development of three nanocrystalline-core MFTs, each one with a different core geometry (toroidal, type CC and shell-type). The purpose of this work is to evaluate and compare the most favourable characteristics and performance of each type of geometry, tested at 5 kHz and 1.75 kVA. The cases studied, in simulation and experimentation with scaled prototypes, focus on evaluating the power density, the core losses, the winding losses, the geometric dimensions, and the dispersion inductance obtained in each MFT, as well as its performances operating with sinusoidal and square waveforms. The results show that: 1) the toroid core has higher efficiency; 2) the shell core has the lowest dispersion inductance and is easier to build, and 3) the CC type has the highest dispersion inductance. This new information is a step to further understand how to get more controllable, more efficient MFTS, with a higher power density and lower cost, depending on the intended application of cutting-edge DC-DC DAB-type converters.

Investigation of the Structure and Magnetic Properties of Bulk Amorphous FeCoYB Alloy

2017 ◽  
Vol 68 (9) ◽  
pp. 2162-2165 ◽  
Author(s):  
Katarzyna Bloch ◽  
Mihail Aurel Titu ◽  
Andrei Victor Sandu
Keyword(s):  
Magnetic Field ◽  
Magnetic Properties ◽  
Hyperfine Field ◽  
Irreversible Processes ◽  
Magnetization Process ◽  
Casting Method ◽  
The Core ◽  
Injection Casting ◽  
Core Losses ◽  
Microstructural Studies

The paper presents the results of structural and microstructural studies for the bulk Fe65Co10Y5B20 and Fe63Co10Y7B20 alloys. All the rods obtained by the injection casting method were fully amorphous. It was found on the basis of analysis of distribution of hyperfine field induction that the samples of Fe65Co10Y5B20 alloy are characterised with greater atomic packing density. Addition of Y to the bulk amorphous Fe65Co10Y5B20 alloy leads to the decrease of the average induction of hyperfine field value. In a strong magnetic field (i.e. greater than 0.4HC), during the magnetization process of the alloys, where irreversible processes take place, the core losses associated with magnetization and de-magnetization were investigated.

scholarly journals Effect of Refined Surface Domains Walls on the Core Losses Components in GO Silicon Steel at Different Frequencies

2020 ◽  
Vol 137 (5) ◽  
pp. 896-899
Author(s):  
I. Petrshynets ◽  
F. Kováč ◽  
V. Puchý ◽  
J. Füzer ◽  
P. Kollár ◽  
...  
Keyword(s):  
Silicon Steel ◽  
The Core ◽  
Core Losses ◽  
Surface Domains

Study on a Methodology of Human Factor Engineering Operating Experience Review for Nuclear Power Plant

2010 ◽  
Author(s):  
Danying Gu ◽  
Shuhui Zhang ◽  
Zhonghe Ning
Keyword(s):  
Nuclear Power ◽  
Power Plants ◽  
Human Factor ◽  
Operating Experience ◽  
Sources Of Information ◽  
Nuclear Facilities ◽  
Human Factor Engineering ◽  
Design Procedures ◽  
Function Allocation ◽  
Review Criterion

The reviewing of operating experience at nuclear power plants (NPP) is not only critically important to safe and reliable operations, but also useful to guide the design of new plants which are similar to the current one under review. How to identify and analyze the safety-related operating experience and then implement a more extensive review is a vital and challengeable issue. In this paper, a methodology of human factor engineering (HFE) operating experience review (OER) is proposed for NPP. The need for the application of HFE in the life cycle activities of NPP and other nuclear facilities has been demonstrated by plant operating histories and regulatory and industry reviews. As a very important element of HFE, the OER is performed from the beginning of the design process. The main purpose of performing an OER is to verify that the applicant has identified and analyzed HFE-related safety problems and issues in previous designs that are similar to the current one. In this way, negative features associated with predecessor designs may be avoided in the current NPP design while retaining positive features. The research of OER concentrates on the aspect of review criterion, scope and implementation procedure of the HFE-related operating experience. As the NRC requirement, the scope of operating experience can be divided into six types in accordance with sources of information. The implementation procedures of USA and China are introduced, respectively. The resolution of HFE OER issues involve function allocation, changes in automation, HSI equipment design, procedures, training, and so forth. The OER conclusions can contribute to other HFE activities and improve the safety, reliability and usability of the HSI design in NPP.

Medium-frequency power transformer using GOES for a three-phase dual active bridge

2020 ◽  
Vol 504 ◽  
pp. 166672
Author(s):  
T. Kauder ◽  
T. Belgrand ◽  
R. Lemaître ◽  
A. Thul ◽  
K. Hameyer
Keyword(s):  
Power Transformer ◽  
Medium Frequency ◽  
Dual Active Bridge ◽  
Three Phase ◽  
Frequency Power

Review on Applications of Low Loss Amorphous Metals in Motors

2010 ◽  
Vol 129-131 ◽  
pp. 1366-1371 ◽  
Author(s):  
S.R. Ning ◽  
Jun Gao ◽  
Y.G. Wang
Keyword(s):  
Magnetic Materials ◽  
Amorphous Alloys ◽  
Amorphous Metals ◽  
Important Process ◽  
Low Loss ◽  
New Class ◽  
The Core ◽  
The Past ◽  
Magnetic Performance ◽  
Core Losses

During the past decade a new class of magnetic materials-amorphous metals, has been under development. This material offers the potential of reducing the core losses of motors dramatically due to its excellent magnetic performance. Thus, the incentive is tremendous to develop cost-competitive motors utilizing amorphous alloys. However, there were some deficiency of a relatively high brittleness and a low stacking factor, which makes it difficult to stamp or cut the material to the shapes that motors required. This paper will briefly review some of the important process technical of magnetic amorphous alloys cores and will describe the results of applying this material in all kind of test motors.

Application of solid state transformers in utility scale solar power plants

2014 ◽  
Author(s):  
Nicole C. Foureaux ◽  
Leonardo Adolpho ◽  
Sidelmo Magalhaes Silva ◽  
Jose Antonio de S. Brito ◽  
Braz de J. Cardoso Filho
Keyword(s):  
Solid State ◽  
Power Plants ◽  
Solar Power ◽  
Solid State Transformers ◽  
Solar Power Plants ◽  
Utility Scale

scholarly journals Dual Active Bridge (DAB) DC-DC converter for multilevel propulsion converters for electrical multiple units (EMU)

2018 ◽  
Vol 180 ◽  
pp. 04002
Author(s):  
Marek Adamowicz ◽  
Zbigniew Krzemiński ◽  
Paweł Stec
Keyword(s):  
Input Voltage ◽  
Regenerative Braking ◽  
Power Electronic ◽  
Power Devices ◽  
Medium Frequency ◽  
Pwm Inverter ◽  
Fast Switching ◽  
Dual Active Bridge ◽  
Power Modules ◽  
Multiple Units

Semiconductor power devices made from silicon carbide (SiC) reached a level of technology enabling their widespread use in power converters. Two different approaches to implementation of modern traction converters in electric multiple units (EMU) have been presented in recent years: (i) 3.3-kV SiC MOSFET-based three-level PWM inverter with regenerative braking and (ii) 6.5-kV IGBT-based fourquadrant power electronic traction transformer (PETT). The former has successfully reached optimized dimensions and efficiency but still requires a bulky line frequency transformer for multisystem applications. The latter characterizes inherent galvanic isolation from AC traction, which is realized by cascaded system of power electronic cells containing medium frequency transformers (MFT). The downsizing of the 6.5-kV IGBT-based cells is, however, problematic. The present paper proposes a different approach, that involves the use of a fast switching 1.2-kV SiC MOSFETS. The SiC-based PETT proposed in the paper is dedicated first for the DC traction. For multi-system application the input voltage of the proposed PETT can be adjusted using weight-optimized adjusting autotransformer. Thanks to utilization of fast-switching SiCbased power modules the weight and size of the power electronic cells can be optimized in a convenient way.

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