Do Brasil para Kassel: Três estudantes conquistam o Prêmio Estadual de Energia-colaboração entre a Universidade de Kassel, a Universidade Federal do Ceará (UFC) e a Universidade Federal de Campina Grande (UFCG), no Brasil

 

Do primeiro encontro em 1998 ao Prêmio Estadual de Energia de Hesse 2026: A longa colaboração entre a Universidade de Kassel, a Universidade Federal do Ceará (UFC) e a Universidade Federal de Campina Grande (UFCG), no Brasil, culminou com o primeiro lugar na categoria Jovens Talentos para os estudantes internacionais Vitor Dourado, Eduardo Simões e Arthur de Queiroz. A equipe desenvolveu uma nova abordagem para transformadores de rede, tornando-os mais compactos e inteligentes, além de integrar o armazenamento em baterias. Utilizando transformadores de alta frequência, inversores modulares no nível da bateria e controle descentralizado, o volume e o peso do sistema foram significativamente reduzidos, possibilitando modos de operação mais flexíveis. O excesso de energia armazenada pode ajudar a estabilizar a rede elétrica em áreas com alta proporção de energia renovável. Além disso, pode ser utilizado para carregar veículos elétricos ou para operação fora da rede. No ano passado, os alunos trabalharam na Universidade de Kassel sob a supervisão do Prof. Jens Friebe, tanto presencialmente quanto no Brasil, sob a supervisão dos Profs. Fernando Antunes, Demercil de Souza e Montie Vitorino. Durante o período em Kassel, os alunos adquiriram experiência e ampliaram seus conhecimentos na área, contribuindo significativamente para o desenvolvimento do primeiro protótipo em escala laboratorial. O Prêmio Estadual de Hesse para Soluções Inovadoras em Energia reconhece conceitos para a geração, armazenamento, distribuição e utilização de energia. O prêmio em dinheiro para os vencedores na categoria jovens talentos é de € 2.500.

FONTE ORIGINAL : https://www.uni-kassel.de/uni/aktuelles-aus-der-universitaet/meldung-startseite/2026/09/11/von-brasilien-nach-kassel-drei-studierende-gewinnen-hessischen-staatspreis-energie.html?cHash=f809fdb4f7e1bbbd9acb07d58274d665

Trends in Isolated Power Converters Using High-Frequency Transformers Takaharu Takeshita*,a, Fellow Wataru Kitagawa*, Senior Member Kohei Budo-Department of Electrical and Mechanical Engineering, Nagoya Institute of Technology, Gokiso, Showa, Nagoya 466-8555, Japan

Trends in Isolated Power Converters Using High-Frequency Transformers Takaharu Takeshita*,a, Fellow Wataru Kitagawa*, Senior Member Kohei Budo**, Member 

Department of Electrical and Mechanical Engineering, Nagoya Institute

of Technology, Gokiso, Showa, Nagoya 466-8555, Japan

**Department of Electrical, Electronic and Computer Engineering, Gifu

University, 1-1 Yanagido, Gifu City 501-1193, Japan

This paper surveys recent trends in isolated power converters using high-frequency transformers, which are used in DC power distribution systems and chargers for electric vehicles, etc. This paper explains the trends in the magnetic materials used in highfrequency transformers for galvanic isolation, the circuit configurations of DC-DC and AC-DC converters using high-frequency transformers, and isolated modular multilevel converters for large capacity applications. © 2026 Institute of Electrical Engineers of Japan and Wiley Periodicals LLC.

ORIGINAL LINK :https://onlinelibrary.wiley.com/doi/epdf/10.1002/tee.70259

Evaluation of Magnetic Materials for Very High Frequency Power Applications Yehui Han, Member, IEEE, Grace Cheung, An Li, Charles R. Sullivan, Member, IEEE, and David J. Perreault, Senior Member, IEEE

 Evaluation of Magnetic Materials for Very High Frequency Power Applications Yehui Han, Member, IEEE, Grace Cheung, An Li, Charles R. Sullivan, Member, IEEE, and David J. Perreault, Senior Member, IEEE

 Abstract—This paper investigates the loss characteristics of rf magnetic materials for power conversion applications in the 10 MHz to 100 MHz range. A measurement method is proposed that provides a direct measurement of inductor quality factor QL as a function of inductor current at rf frequencies, and enables indirect calculation of core loss as a function of flux density. Possible sources of error in measurement and calculation are evaluated and addressed. The proposed method is used to identify loss characteristics of several commercial rf magnetic core materials. The loss characteristics of these materials, which have not previously been available, are illustrated and compared in tables and figures. The use of the method and data are demonstrated in the design of a magnetic-core inductor, which is applied in a 30 MHz inverter. The results of this paper are thus useful for design of magnetic components for very high frequency (VHF) applications. Index Terms—Magnetic materials, resonant inductor, very high frequency (VHF), Steinmetz parameters. I. INTRODUCTION There is a growing interest in switched-mode power electronics capable of efficient operation at very high switching frequencies (e.g., 10 – 100 MHz). Power electronics operating at such frequencies include resonant inverters [1]–[10] (e.g., for heating, plasma generation, imaging, and communications) and resonant dc-dc converters [1], [3], [11]–[20] (which utilize high frequency operation to achieve small size and fast transient response.) These designs utilize magnetic components operating at high flux levels, and often under large flux swings. Moreover, it would be desirable to have improved magnetic components for rf circuits such as matching networks [21]–[25]. There is thus a need for magnetic materials and components suitable for operation under high flux swings at frequencies above 10 MHz. Unfortunately, most magnetic materials exhibit unacceptably high losses at frequencies above a few megahertz. Moreover, the few available bulk magnetic materials, which are potentially suitable for frequencies above 10 MHz, are typically only characterized for small-signal drive conditions, and Y. Han is with the University of Wisconsin-Madison, 2559C Engineering Hall, 1415 Engineering Drive, Madison, WI 53706 USA (e-mail: yehui@engr.wisc.edu). G. Cheung is with Intersil Corp (e-mail: gmcheung@gmail.com). A. Li is with Massachusetts Institute of Technology, MA 02139 USA (email: anli@mit.edu). C. R.

FULL PAPER: https://dspace.mit.edu/entities/publication/886eec02-daf1-451f-ab37-e797d79313b8

태양광 시스템과 BESS를 적용한 직류 배전 시스템에 관한 연구 = A Study on DC Distribution System Applying Battery Energy Storage System and Solar Energy System-Jung Ho-chul Department of Electrical Engineering Graduate School Yeungnam University

 

태양광 시스템과 BESS를 적용한 직류 배전 시스템에 관한 연구 = A Study on DC Distribution System Applying Battery Energy Storage System and Solar Energy System 

Jung Ho-chul

Department of Electrical Engineering

Graduate School

Yeungnam University

( Supervised by professor Sang-Bong Rhee )

This thesis study the Direct-Current(DC) distribution system along with Battery Energy Storage System(BESS) and Solar Energy system. Power conversion from Alternative current(AC) to DC has bad influence on the power supply reliability. Therefore, it is required to reduce power loss in order to supply it to the DC load efficiently by constituting the DC distribution system. This thesis models an AC/DC converter which converts the power from existing AC system to DC system, DC/DC converters, BESS system, Building Integrated Photovoltaic System(BIPV), and Roof-Top Photovoltaic solar energy system for uninterruptible power supply in case of fault in system. Electromagnetic Transient Program (EMTP)/ATPDraw has been used to model each system individually first and then the all systems are integrated and modeled, to verify the operational characteristic considering all possible modes of operation. It is deduced from the simulation result that the performance of proposed system is perfect. These results are expected to contribute to the researchers for the analysis and design of DC distribution system in the future.

ORIGINAL LINK:

 https://www.riss.kr/search/detail/DetailView.do?p_mat_type=be54d9b8bc7cdb09&control_no=14e801fa4380a5e7ffe0bdc3ef48d419&keyword=bess

A Study on Safety Assessment Regarding Battery Fire and Explosion Risks for the Application of Battery Energy Storage Systems (BESS) to Ships-배터리 에너지 저장시스템(BESS)의 선박 적용을 위한 배터리 화재·폭발 안전성 평가에 관한 연구

 A Study on Safety Assessment Regarding Battery Fire and Explosion Risks for the Application of Battery Energy Storage Systems (BESS) to Ships-배터리 에너지 저장시스템(BESS)의 선박 적용을 위한 배터리 화재·폭발 안전성 평가에 관한 연구 

 Abstract 

 Due to the International Maritime Organization's (IMO) tightened environmental regulations, ship propulsion systems are shifting toward eco-friendly technologies, leading to the expanded adoption of Battery Energy Storage Systems (BESS). Shipboard BESS are implemented for purposes such as propulsion assistance, peak load shaving, and energy efficiency improvement; they operate through the integration of various components, including battery cells, Battery Management Systems (BMS), Power Conversion Systems (PCS), and Energy Management Systems (EMS). In particular, Lithium-ion batteries (LIBs) are widely adopted as the core component of BESS due to their excellent characteristics, such as high energy density, long lifespan, and high charge/discharge efficiency. However, because LIBs contain flammable electrolytes, they pose potential risks of fire or explosion in the event of abnormal conditions—such as external impact, internal short circuits, or thermal runaway. These characteristics, combined with the confined spaces, enclosed structures, and limited external firefighting support inherent to ships, make ensuring the fire and explosion safety of BESS a critical technical challenge. Currently, however, most domestic and international classification society regulations are based on land-based IEC standards, with a lack of safety testing criteria that reflect the unique operational environment of ships. Therefore, this study comprehensively evaluated the safety of shipboard BESS—considering their actual operational environment—by conducting safety tests at the cell and module levels under mechanical and thermal abuse conditions, testing for secondary explosions caused by thermal runaway and off-gassing, and assessing a targeted fire suppression system designed for initial fire response. Through this work, the study aims to propose safety measures tailored to the marine environment and provide foundational data for future regulatory improvements. In this study, domestic and international standards were analyzed to ensure the safety of marine battery energy storage systems (BESS), and empirical tests were conducted based on high-risk test items covering mechanical, thermal, and electrical abuse conditions. Evaluations of durability against high temperatures, impact, vibration, and crushing—conducted across various battery types and states of charge—revealed distinct characteristics for each cell type while confirming overall high safety levels. Furthermore, to overcome the limitations of conventional visual inspections, a new evaluation framework incorporating a 48-hour stabilization period and voltage monitoring techniques was proposed; this enables the quantitative diagnosis of subtle damage or performance degradation not visible to the naked eye. These findings underscore the necessity of establishing battery safety evaluation standards optimized for the unique operational conditions of ships and are expected to serve as practical foundational data for future improvements to relevant regulations and testing guidelines. Secondly, the study assessed the risk of secondary explosions caused by off-gas generated during thermal runaway in marine BESS installation areas and quantitatively analyzed the structural integrity of fire-resistant bulkheads. To this end, cell-level thermal runaway tests were conducted to identify the primary flammable components of the off-gas, and explosion tests using mixed gases experimentally verified the explosive risks associated with the off-gas. Subsequently, based on these results, finite element analysis was performed on an actual vessel to evaluate the structural limit state of the battery room bulkheads. The findings highlighted the necessity of incorporating explosion considerations into effective structural design and ensuring adequate separation distances for battery rooms, providing practical foundational data for future regulatory revisions and the establishment of design standards. Thirdly, considering the difficulty of obtaining external firefighting support during a fire—due to the enclosed structure and spatial constraints of ships—a targeted-injection fire suppression system was proposed for the initial suppression of fires in battery energy storage systems (BESS). To this end, the fire suppression performance of non-aqueous (Novec 1230) and aqueous (F-500) agents was experimentally compared across single- and multi-module configurations. Both agents proved effective in addressing initial thermal runaway; the targeted-injection method, by spraying the agent directly onto the ignition point, effectively prevented fire spread by locally blocking heat release and inhibiting heat transfer. Given the shipboard environment—which necessitates enclosed cabinets and high ingress protection ratings (IP44 or higher)—an internal installation method was found to be more effective than an external supply system. This internal suppression system, integrating thermal runaway detection with targeted injection, could be incorporated into future safety guidelines for marine BESS, contributing to the prevention of reignition and the minimization of structural damage through early-stage fire suppression. This study employed a multifaceted approach to ensure fire and explosion safety for battery energy storage systems, which are critical components of electric-propulsion ships. Mechanical and thermal abuse tests reflecting actual ship operating conditions were conducted to verify test parameters and the impact of risk factors; additionally, explosion tests were performed to experimentally demonstrate the explosion risks posed by off-gases generated during thermal runaway and to quantitatively assess the associated risk levels. Furthermore, the study experimentally validated the effectiveness of a targeted-injection fire suppression system—optimized for the spatial constraints of ships—in preventing the initial spread of fire, thereby contributing to the development of safety guidelines for shipboard energy systems. The results of this study can serve as an academic and practical foundation for strengthening regulations and technical standards related to the safety assessment of marine batteries.

FULL THESIS: https://www.riss.kr/search/detail/DetailView.do?p_mat_type=be54d9b8bc7cdb09&control_no=1cff8acdef4e1b7bffe0bdc3ef48d419&keyword=BESS

MILP(Mixed Integer Linear Programming)-Based Optimal Strategy for Real-time Operation of Multi-Objective Battery Energy Storage System Integrated with Wind Generator BY Choi, Won Bin (Supervisor Song, Hwa Chang) Dept. of Electrical and Information Engineering Graduate School Seoul National University of Science and Technology

MILP(Mixed Integer Linear Programming)-Based Optimal Strategy for Real-time Operation of Multi-Objective Battery Energy Storage System Integrated with Wind Generator

 by Choi, Won Bin (Supervisor Song, Hwa Chang) 

Dept. of Electrical and Information Engineering

 Graduate School Seoul National University of Science and Technology 

풍력발전 연계 다목적 BESS의 실시간 운영을 위한 혼합정수선형계획법 기반 최적 충방전 전략

 Abstract Large thermal plants-based conventional power system has been changing the system structure to the distributed and decentralized one in which a various number of REs and ESSs are installed regionally. The change leads to new market policies and emergence of prosumer. There can be several considerations to operate the Wind-BESS hybrid system. For the prosumer’s perspective, maximizing operational profit can be one of the most prioritized goals. Another important thing to be considered is to control the output not to lead to severe frequency fluctuation in case of incident wind speed deviation. In this paper, two operation algorithms based on mixed integer linear programming are proposed. First scheme is the wind ramp-rate constrained economic operation. According to domestic RPS policy, the EMS provides the most profitable 1 day scheduling that does not exceed the limitation assigned by local grid code. Secondly, Peak shaving algorithm dispatching multiple BESSs is proposed. BESS resources will be able to lighten the system’s burden when certain local grids experience peak load. So the algorithm will dispatch applied batteries considering each performance, efficiencies and its physical limit. The output throughout this study could be references of BESS operation and controller. Also, the designing EMS with proposed algorithms are expected to maximize the advantages for both prosumer and grid operator.

ORIGINAL SOURCE: https://www.riss.kr/search/detail/DetailView.do?p_mat_type=be54d9b8bc7cdb09&control_no=3414f3b6158e2649ffe0bdc3ef48d419&keyword=BESS

Translated from Korean to English.:https://www.mediafire.com/file/04s5dd776vp76o9/MILPMixed+Integer+Linear+Programming-Based+Optimal.en.dual.pdf/file

NOTE: Thesis translated from Korean to English using artificial intelligence. As you know, the translation isn't perfect, but it helps a lot. However, it struggles with mathematical formulas, which is why I'm publishing the original and translated files side-by-side so you can read them successfully.

PROJETO PIONERO DE SHORE POWER NO BRASIL-ESTUDO DO CASO DO PORTO DE PECEM -CEARA-BRASIL-PALESTRANTE ENG. GUSTAVO CASTELO BRANCO ( CEO GRID POWER SOLUTION)-INTERSOLAR SAO PAULO

 

ASSISTA O VIDEO COMPLETO MINISTADO PELO ENG. GUSTAVO BRANCO  (GPS)

재사용 배터리 ESS 안전 운용 및 성능 검증 시뮬레이션 환경 개발 = Development of Simulation Environment for Safe Operation and Performance Validation of Reused Battery ESS

 

Development of Simulation Environment for Safe Operation and Performance Validation of Reused Battery ESS Park Joonhong Department of Electrical Engineering, Graduate School of Chonnam National University (Supervised by Professor Ahn Seon-ju)

 (Abstract) With the expansion of the used battery market expected around 2030, the promotion of reuse and recycling industries for used batteries has emerged as a critical issue. Battery reuse technology refers to the process of evaluating the remaining capacity and lifespan of secondary batteries, whose full-charge capacity has fallen below a certain threshold after use in electric vehicles (EVs), and repurposing them for other applications such as ESS (Energy Storage Systems) and UPS (Uninterruptible Power Supplies). This technology holds significant value in terms of economic efficiency and resource circulation. Particularly, numerous demonstration studies are being conducted to optimize safe operation and establish system standardization for ESS using reused batteries. This study aims to ensure the safe operation of ESS composed of reused batteries by designing three algorithms necessary for estimating battery status and evaluating health, based on existing research and literature, and examining their application conditions. These algorithms are presented in the form of SOX (State of X, where X = Power, Health, Balance, etc.), and based on this, an operational program menu structure was designed. Additionally, a simulation model was developed to validate the performance of reused battery ESS, identifying key considerations for model design, including capacity deviation, internal parameter variation, degradation rate differences, and thermal factors. Simulated operations were used to verify parts of the algorithms and observe changes in ESS conditions. This study differentiates itself from existing research in two main aspects. First, it involves the actual application of operational data-based battery status estimation algorithms to ESS. Unlike previous studies that primarily focused on laboratory environments or small-scale cell-based tests, this study incorporated factors necessary for applying these algorithms to a 500kWh large-scale ESS composed of reused batteries. Second, it identifies and integrates key considerations for simulation model design to validate the performance of reused battery ESS. Specifically, four essential elements that must be included in the design of reused battery ESS models were defined and applied to the simulation model, providing guidance for future ESS model design utilizing reused batteries. In this study, a safe operation plan for reused battery ESS was developed, and a simulation model for performance validation was created. Furthermore, through simulated operations under various conditions, the study analyzed ESS conditions and confirmed the effectiveness of the algorithms. The results are expected to serve as foundational data for evaluating the safety and performance of ESS in the future.

FULL THESIS

 :https://www.mediafire.com/file/1yd28ry2jnfe3ya/000000075764_20260826213443.en.dual.pdf/file

3상 인버터를 위한 방열판 크기 최적화 -Heat Sink Size Optimization for 3-Phase Inverter-Gwangwoon University Graduate School Department of Electrical Engineering-AUTHOR Seo Yujin

 

3상 인버터를 위한 방열판 크기 최적화 -Heat Sink Size Optimization for 3-Phase Inverter-Gwangwoon University Graduate School Department of Electrical Engineering-AUTHOR Seo Yujin This thesis is submitted as an Engineering Master's Thesis 다국어 초록 (Multilingual 

Abstract) kakao i 다국어 번역 The power loss of the inverter acts as heat. Therefore, heat dissipation design is essential for high-output inverter operation. In this paper, a heat sink size optimization method applicable to all inverter module and heat sink structures is proposed. The capacity of the inverter was selected according to the load conditions, and the input power, output power, switching loss, conduction loss, case temperature, and junction maximum temperature were measured through simulation. Through this, the case temperature and junction temperature according to the loss of the inverter are found, and the appropriate heat sink size is suggested through heat dissipation simulation. The smaller the size of the heat sink, the higher the heat dissipation efficiency at the same power loss. However, if the temperature of the junction of the inverter becomes too high, operation is impossible. Therefore, we find out through simulation how high the operating temperature of the inverter can be with the minimum heat sink size. Create a 3D model of the inverter module and heat sink, apply the loss power derived through inverter simulation, and check the output temperature through simulation while reducing the size of the heat sink. Through this, a method for selecting the minimum size of the heat sink applicable to the inverter module was proposed. 

ORIGINAL LINK KOREAN:

 https://www.riss.kr/search/detail/DetailView.do?p_mat_type=be54d9b8bc7cdb09&control_no=de6fb1f6978f0912ffe0bdc3ef48d419&keyword=3%EC%83%81%20%EC%9D%B8%EB%B2%84%ED%84%B0 

Thesis translation from Korean and English:https://www.mediafire.com/file/eybq0nvdhtnik4w/Heat+Sink+Size+Optimization+for+3-Phase+Inverter.pdf/file

 

Effects of Flat-Core Geometry on Magnetic Flux Distribution and Thermal Behavior in Integrated Transformers for High-Frequency LLC Converters- Journal of Electrical Engineering & Technology-BY-Jun-Taek Oh · Taek-Keun Jung · Jong-Soo Kim

 

Effects of Flat-Core Geometry on Magnetic Flux Distribution and Thermal Behavior in Integrated Transformers for High-Frequency LLC Converters Jun-Taek Oh1 · Taek-Keun Jung1 · Jong-Soo Kim1 Received: 18 November 2025 / Revised: 12 April 2026 / Accepted: 27 April 2026 / Published online: 22 May 2026

 © The Author(s) under exclusive licence to The Korean Institute of Electrical Engineers 2026

 Abstract This study investigates the thermal behavior of an integrated transformer structure that incorporates a flat core to expand the flux-sharing area. Using electromagnetic analysis based on Ansys Maxwell, the characteristics of magnetic flux distribution and core temperature rise are analyzed, and the magnetic flux density and thermal behavior are compared according to the presence of the resonant inductor core and variations in flat-core thickness. In addition, the characteristics of flux overlap and saturation according to the direction of flux flow are analyzed. Based on these analyses, an optimized integrated transformer design is proposed to effectively mitigate heat generation and magnetic flux saturation. To verify the feasibility of this design, a 500-kHz LLC resonant converter prototype was built, and experiments were conducted at approximately 3.1 kW in the resonant frequency region. The results show that the optimized design reduces core temperature rise by up to 95.8 °C compared with a conventional design that does not consider flat-core thickness and integrated transformer geometry, while also improving overall system efficiency by 0.7%. These findings demonstrate the effectiveness of the flat-core-based integrated transformer design in high-frequency, high-power-density power conversion systems and highlight its potential applicability to future highly integrated power electronic systems.

VIEW ORIGINAL  FULL ARTICLE : https://link.springer.com/article/10.1007/s42835-026-02795-9

ALTERNATIVE LINK :https://www.mediafire.com/file/u2r54j2fkjxipqb/s42835-026-02795-9.pdf/file

WEBINAR From Grid Following GFL to Grid Forming GFL (Spanish Audio)-Dr.Francisco Gonzalez-Longatt -IEE-UNMSM

 https://youtu.be/O5qq5OkpNHo?si=bH40K4CqfeW0zpoI

 

Title: From Grid Following to Grid Forming Converters Webinar, 2nd April 2026, 5:10 PM (Peru time).

 Abstract Power Electronic converters (PECs) have been in power systems for many decades; however, it is only recently that they have come to account for a significant share of generation, transmission, and demand. PEC has dramatically changed in recent times, from a very limited support role in power system operation to a key element in the transition to a zero-carbon society. The early developments in high-voltage direct current (HVDC) based on Thyristors were a formidable step forward for bulk power transmission. However, the development of more flexible commutation devices and sophisticated control mechanisms, together with appropriate practices and grid codes, is making voltage source converter (VSC)-interfaced technologies a crucial component of modern and future power system operations and paving the way for a secure transition to a zero-carbon society. This short seminar provides a general introduction to power electronic converters and their transition from grid-following to grid-forming, including practical discussions of the importance of several elements and the control philosophy. The seminar includes (but is not limited to) discussing the benefits of a smart grid-friendly converter.

RADIATION TOLERANT POWER ELECTRONICS FOR SPACE APPLICATIONS Doctoral Thesis Jaroslav Laifr Prague, November 2018-Czech Technical University in Prague Faculty of Electrical Engineering Department of Measurement

RADIATION TOLERANT POWER ELECTRONICS FOR SPACE APPLICATIONS Doctoral Thesis Jaroslav Laifr Prague, November 2018 

Abstract: The aim of this thesis is to summarize the state-of-the-art satellite electronics design, find its bottlenecks and propose a novel, scientific-based approaches on the space power systems development addressing rapidly evolving so-called "NewSpace" ecosystem. The modern consumer-driven electronics with rising computational power and miniaturization demands similar to the Moore's Law for computers brings new technological challenges and problems. The NewSpace community needs to understand them to successfully conduct its presence in space, both aboard earth-orbiting and interplanetary missions. It is the satellite (manned and unmanned) and aerospace industry, private or government-led institutions which need to follow the technological and scientific progress by faster steps if want to utilize the full potential of the scientific and technological progress in commercially available markets and technological breakthroughs. Initial studies are the follow-up of the author's Master thesis: Fluxgate Magnetometer for Satellite Attitude Control, carried on within the multi-faculty CubeSat project CzechTechSat led by the author as the Principal Investigator. Students were implementing authors' hypotheses within their bachelor and master thesis terms and supported their research and validation. Key findings were implemented as an practical example of the thesis utilization within the Low Voltage Power Supply unit for the Radio and Plasma Waves Investigation instrument selected to be flown aboard the European Space Agency L-Class mission called JUICE (Jupiter Icy Moon Explorer) into the Jovian system in 2023. Also in the project CRREAT by the realization of the ultra low power dosimeter for small satellites. The thesis is also a base of the spacecraft electronics design E-Book called "NewSpace Economically" prepared to be released to the small satellite community in 2019. Keywords: ESA, RPWI, JUICE, CubeSat, NewSpace, Radiation, Power Supply, Satellite.

ORIGINAL LINK : 

https://dspace.cvut.cz/bitstreams/f1967e19-960c-4e34-9a18-6039da3b856d/download

ENLACE ALTERNATIVO : https://www.mediafire.com/file/6k4gywmdvanik6c/F3-D-2019-Laifr-Jaroslav-Jaroslav_Laifr_Doctoral_Thesis.pdf/file

PROJETO DO CIRCUITO RESONANTE TESTE DE POTENCIA E TESTE DE CURTOCIRCUITO

 

 ENGENHEIRO XIAOSHAN LAOSHOU EXPLICA PASO A PASO DEL TESTE DE POTENCIA E TESTE DE CURTOCIRCUITO.

PROYECTO DE INVERSOR RESONANTE-PARTE2

 

PROYECTO DE LA TARJETA POTENCIA DEL INVERSOR RESONANTE

 

MONTAGEM E CALIBRAÇAO DE INVERSOR RESONANTE SENOIDAL

 

Implementation of Energy based Hysteresis Model in LTspice for power electronics applications Fabien Sixdenier, Riccardo Scorretti, Vittorio Bertolini, Antonio Faba-Universite Claude Bernard Lyon INSA Lyon, Ecole Centrale de Lyon, France † University of Perugia, Italy

 Implementation of Energy based Hysteresis Model in LTspice for power 1 electronics applications Fabien Sixdenier∗, Riccardo Scorretti∗†, Vittorio Bertolini†, Antonio Faba† 

Abstract—Circuit simulation software is routinely used in power electronics to analyze systems with magnetic cores exhibiting significant hysteresis behavior. This paper presents the implementation of the Energy-Based Hysteresis Model (EBHM) in LTspice to account for hysteresis in magnetic cores of inductors. The model is validated via transient simulations of a DC/DC buck converter, comparing results with experimental measurements across various input voltages, frequencies, and duty cycles. While the model accurately predicts average current, discrepancies in current ripple are observed, attributed to core-to-core variability in ferrite materials. The EBHM implementation offers a significant computational advantage, with simulation times remaining under 10 seconds even for highly saturated cases. The model’s robustness and potential for extension to dynamic effects (e.g., eddy currents) are discussed, along with its applicability to other power electronics topologies.

READ FULL ARTICLE: https://hal.science/hal-05422867/document

Study of a High-Power Medium Frequency Transformer Using Amorphous Magnetic Material by Shichong Zhang,Dezhi Chen * and Baodong Bai- School of Electrical Engineering, Shenyang University of Technology, Shenyang 110027, China

 

Study of a High-Power Medium Frequency Transformer Using Amorphous Magnetic Material by Shichong ZhangORCID,Dezhi Chen * andBaodong Bai School of Electrical Engineering, Shenyang University of Technology, Shenyang 110027, China

Abstract A shell-type medium frequency transformer (MFT) using amorphous alloy material is designed for high-power electronic applications. The optimal area product design method is adopted to design an MFT, which maximizes the high efficiency and power density, minimizes the loss and volume, and meets the limitations of insulation and temperature rise. Then, a 20 kVA/10 kHz MFT is designed. To ensure the rationality of the MFT design, the magnetic properties of the amorphous alloy material are measured, and finite element simulations are carried out based on measured magnetic properties. The magnetic flux density, loss, and temperature rise of the designed MFT are analyzed. Finally, a 20 kVA/10 kHz MFT prototype is fabricated, and experimental tests are carried out. The loss and temperature rise of the MFT prototype are within reason, which verifies the effectiveness of the proposed scheme. 

READ FULL ARTICLE:https://www.mdpi.com/2073-8994/14/10/2129

SUB SYNCHRONOUS OSCILLATIONS IN MODERN TRANSMISSION GRIDS DESIGN AND VALIDATION OF NOVEL CONCEPTS FOR MITIGATING ADVERSE DFIG-SSR INTERACTIONS

SUB SYNCHRONOUS OSCILLATIONS IN MODERN TRANSMISSION GRIDS DESIGN AND VALIDATION OF NOVEL CONCEPTS FOR MITIGATING ADVERSE DFIG-SSR INTERACTIONS

Dissertation for the degree of Doctor at Delft University of Technology, by the authority of the Rector Magnificus Prof.dr.ir. T.H.J.J. van der Hagen, Chair of the Board for Doctorates, to be defended in public on Thursday, 24 June 2021 at 15:00 by Vinay Naraindatt SEWDIEN Civil Engineer, KU Leuven, Belgium born in Paramaribo, Suriname 

 SUMMARY 

The ongoing energy transition results on the one hand in a proliferation of power electronics interfaced devices and on the other hand in a decreasing availability of conventional synchronous generation. These developments pose important challenges for transmission system operators to operate a low inertia power system. As part of my research I have created a list of 28 related challenges, validated by industry, that are grouped into three categories: (i) Reduced Voltage and Frequency Support, (ii) New Operation of the Power System and (iii) New Behaviour of the Power System. The focus of this research is on category (iii) and addresses the sub synchronous resonance (SSR) phenomenon between a doubly fed induction generator (DFIG) and a series compensated transmission line. This phenomenon is denoted as DFIG-SSR in this thesis. Failing to adequately address resonances results in among others degradation of the power quality, protection tripping, physical damage to power system equipment and ultimately instability in the power system. The main objective of this research is to investigate and validate the degree of effectiveness of the existing phase imbalance compensation concept, as well as to design and validate a new prediction gain scheduling control concept for mitigating DFIG-SSR. For these investigation, design and validation activities, electromagnetic transient (EMT) simulation models of the DFIG wind turbine are developed using Power System Computer Aided Design (PSCAD). In line with common practice, the topology of the IEEE First Benchmark Model is used as a smallsize study model, whereas the larger IEEE 39-Bus Model is used for validation of the obtained results. The impedance based stability method is used to quantify the impact of potential mitigation solutions on DFIG-SSR. This dissertation has three main contributions. First, recommendations are developed to obtain the frequency-dependent impedance of power electronics interfaced devices through numerical EMT simulations of black box, non-linear simulation models. These recommendations are crucial to perform interaction studies. The influence of the impedance calculation time, model granularity and composition of the perturbation signal on the obtained impedance is presented and guidelines are given on how to select the correct model and parameters for the numerical simulations. Second, a methodology is developed that enables the systematic assessment and design of the phase imbalance compensation concept for mitigating DFIG-SSR. The phase imbalance compensation concept is an alternative way of fixed series compensation, where the imbalance is implemented as a series or as a parallel resonance scheme in either one or two phases of the transmission line. The influence of the series and parallel schemes as well as the influence of their different degrees of asymmetry on the stability of the system are rigorously investigated. The series scheme introduces one series resonance in the power system, where the resonance frequency increases as a function of the degree of asymmetry. The increase is more pronounced viii SUMMARY when the series scheme is implemented in two phases. The parallel scheme on the other hand decreases the series resonance frequency and this decrease is more pronounced when the scheme is implemented in two phases. However, the parallel scheme introduces an additional parallel resonance with a frequency between 20 and 30 Hz, the stability of which depends on the degree of asymmetry.

FULL THESIS :https://research.tudelft.nl/files/93510648/Thesis_for_ONLINE_v2.pdf

Satellite Electrical Power System -Nuno Laranjeira Ramo Thesis to obtain the Master of Science Degree in Electronics Engineering -INSTITUTO SUPERIOR DE LISBOA

Satellite Electrical Power System by Nuno Laranjeira Ramo Thesis to obtain the Master of Science Degree in Electronics Engineering -INSTITUTO SUPERIOR DE LISBOA 

 Abstract The Electrical Power System (EPS) is an electronic circuit board that is designed to supply and manage process the energy in an efficient way. This document describes the design architecture and circuits involved for an EPS deployed in the ISTsat ONE nano satellite project. The EPS generates energy through its solar panels which is stored in the battery and then, using DC-DC switching voltage regulators, converts it to the final voltage of +3.3 V and +5 V, supplying these voltage rails for the rest of the subsystems of the satellite. This architecture meets the performance and size requirements of CubeSat architecture (cubic shape with 10 cm of edge, satellite with less than 10 kg). The EPS is composed by various systems, namely: Maximum Power Point Tracking mechanism to achieve maximum efficiency in the conversion of solar energy, a 20.8 Wh battery, solar panels and redundant circuitry to continuously ensure the power supply to the satellite. The EPS is a subsystem of the ISTsat ONE and as such, it communicates with other subsystems present in the satellite sending data logs, error warnings as well as receiving commands.

FULL THESIS: https://istsat-one.tecnico.ulisboa.pt/~istsat-one.daemon/docs/thesis_NunoRamos_EPS_2018.pdf