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

Grid-Forming Inverters as Synchronous Machine Replacements: Stability Analysis and Overcurrent Protection Strategies-MASTER THESIS ENGINEERING ELERTRICAL-ROBERTO NETO-Università di Padova

 

Grid-Forming Inverters as Synchronous Machine Replacements: Stability Analysis and Overcurrent Protection Strategies-MASTER THESIS ENGINEERING ELERTRICAL-MASTER CANDIDATE-ROBERTO NETO-Università di Padova 

 Abstract The increasing integration of renewable energy sources into power systems is driving the progressive replacement of traditional synchronous generators with power electronic converters. While essential for decarbonization, this shift leads to a significant reduction in system inertia, thereby compromising frequency stability and dynamic performance. Grid-forming inverters (GFMs) have emerged as a promising solution to these challenges, as they autonomously regulate voltage and frequency, effectively emulating the behavior of conventional synchronous machines. This thesis presents a comprehensive study of three major grid-forming control strategies: droop control, Virtual Synchronous Machine (VSM), and dispatchable Virtual Oscillator Control (dVOC). Each approach is evaluated based on its dynamic response and stability characteristics. Time-domain simulations are carried out in MATLAB/Simulink on a modified IEEE 9-bus test system. Scenarios include systems dominated by synchronous machines, mixedgeneration configurations, and grids with 100% inverter-based renewable sources. The results highlight the critical role of GFMs in enhancing frequency stability and grid resilience. In addition, the thesis includes detailed modeling of the inverters DC-side power supply, consisting of a photovoltaic plant coupled with a Hybrid Energy Storage System (HESS) based on batteries and supercapacitors. This configuration reflects realistic operating conditions and ensures stable power injection into the AC grid. Finally, the thesis explores protection mechanisms to mitigate overcurrent conditions during disturbances. These control strategies are vital to ensure the secure operation of GFMs under fault scenarios and to support the long-term reliability of renewable-based power systems.

FULL THESIS: https://thesis.unipd.it/retrieve/7da633d3-120d-48a3-ad52-76b2fc66574e/Tonet_Roberto.pdf

Inverter Control Strategies for a Grid Stabilizing Power-to-Gas System = 전력가스화 (P2G) 시스템에서 계통 안정화를 위한 인버터 제어기법 -Gedeon Rusatira-Tech University of Korea

 

Inverter Control Strategies for a Grid Stabilizing Power-to-Gas System 전력가스화 (P2G) 시스템에서 계통 안정화를 위한 인버터 제어기법by  Gedeon Rusatira 

 A Ph.D. Dissertation Submitted to the Department of Energy and Electrical Engineering and the Graduate School of Tech University of Korea in partial fulfillment of the requirements for the Philosophy Degree in Engineering June 2024

Abstract 

Inverter Control Strategies for a Grid Stabilizing Power-to-Gas System 전력가스화 (P2G) 시스템에서 계통 안정화를 위한 인버터 제어기법 

The integration of Power-to-Gas (P2G) systems into modern power grids represents a pivotal advancement towards achieving a more sustainable and resilient energy infrastructure. However, this integration introduces both challenges and opportunities, particularly concerning grid stability and the effective incorporation of renewable energy sources. This thesis delves into the intricate dynamics of P2G system integration, with a specific focus on the role of inverter control strategies in ensuring grid stability and facilitating the seamless integration of renewable energy sources. Through an extensive review of existing literature and rigorous analysis, various control strategies tailored for P2G applications are explored, emphasizing their efficacy in addressing grid stability concerns. Key aspects examined include voltage and frequency regulation, active and reactive power control, ancillary services provision, and energy storage management. These factors are crucial for maintaining grid stability amidst the variability inherent in renewable energy generation and the intermittent nature of P2G systems. Additionally, the development and implementation of advanced control algorithms are discussed. These algorithms are designed to account for grid dynamics, renewable energy variability, and compliance with grid codes and regulations. A particular focus is placed on enhancing grid-forming capabilities within inverters, enabling autonomous operation even in weak grid conditions, thereby bolstering grid resilience. Practical case studies and simulations form an integral part of this research, allowing for the assessment of various control strategies’ performance under diverse grid scenarios. Insights gained from these analyses contribute to a deeper understanding of inverter control strategies and address regulatory and technical considerations associated with grid support functions. Ultimately, this thesis aims to serve as a valuable resource for policymakers, grid operators, and industry stakeholders, providing guidance on the implementation of effective control strategies for P2G applications. Novel distributed control systems specifically designed for P2G inverter applications are proposed, with the overarching goal of improving stability, efficiency, and dependability within the energy grid. By advancing our understanding of inverter control strategies and their role in P2G integration, this research contributes to the ongoing transition towards sustainable energy systems. This fosters a robust and environmentally friendly energy landscape, paving the way for a more resilient and equitable energy future.

 keywords: Distributed control strategies, Grid stability, Inverter control, Power-to-Gas (P2G), Renewable energy integration 

FULL THESIS : https://www.riss.kr/search/detail/DetailView.do?p_mat_type=be54d9b8bc7cdb09&control_no=e4eef281c8f67286ffe0bdc3ef48d419&keyword=grid%20forming

인버터 주도 계통 안정도의 그리드 포밍 제어 영향 연구 = A study on the influence of grid forming control on inverter-driven grid stability

 

인버터 주도 계통 안정도의 그리드 포밍 제어 영향 연구 = A study on the influence of grid forming control on inverter-driven grid stability GwangwoonUniversity GraduateSchoolof ElectricalEngineering KimDongWhi

ABSTRACT Recently, as new and renewable power sources penetrate into the system, an increase in IBR (Inverter Based Resource) and a decrease in synchronous generators are occurring. In this paper, the system operation using GFM (Grid Forming) was studied as a solution. The comparison study has been performed with the existing GFL (Grid Following) and synchronous generator in terms of the reduction in system inertia and robustness in the grid. This paper proposes a method for calculating the optimal capacity of GFM to ensure system stability and apply the novel IBR protection system (FRT, Black Start). In the case of GFM optimal capacity calculation, a renewable power source system network is modeled and various (load fluctuations, ground faults, generator trip) simulations are conducted with the existing synchronous generator, GFL, and GFM for the power system stability analysis. The formulation was performed by measuring Nadir with Monte-Carlo simulation results using the system inertia, GFL & GFM ratio, and renewable energy penetration rate as parameters. With the result, it was possible to know frequency nadir and the optimal GFM capacity required depending on system situation. The fault current limiter proposed has been verified its performance on the grid-connected photovoltaic IBR system. In addition, a stand-alone black start of GFM was proposed and the contribution of stable recovery through synchronization control was confirmed.

ORIGINAL LINK : https://www.riss.kr/search/detail/DetailView.do?p_mat_type=be54d9b8bc7cdb09&control_no=b0edd4d81bb1ee59ffe0bdc3ef48d419&keyword=inverter%20grid%20forming

Development and Application of a Resilience-Based Index for Stability Assessment of Grid Integrated with Grid-Forming Inverters Lee Su-Ho Departmen of Electric and Electrical Engineering Graduate School Keimyung University

 

Development and Application of a Resilience-Based Index for Stability Assessment of Grid Integrated with Grid-Forming Inverters Lee Su-Ho Departmen of Electric and Electrical Engineering Graduate School Keimyung University (Supervised by Professor Park Young-Su) 

ABSTRACT 

This research focuses on analyzing the impact of Grid-Forming inverters in modern power systems with a growing share of renewable energy and develops a Frequency Stability Composite Index (FSCI) for evaluating their effectiveness particularly within the Jeju power grid. As Jeju Island progresses toward its "Carbon Free Island 2030" initiative incorporating Grid-Forming inverters has become essential to address the limitations of existing Grid-Following inverters in low-inertia systems. The study includes simulations based on the IEEE-9 bus test system and the Jeju grid exploring various disturbance scenarios to assess the contribution of Grid-Forming inverters. The evaluation spans scenarios with renewable energy penetration levels of 30% 50% 70% and 100%.

Furthermore the FSCI methodology is applied to quantitatively measure the dynamic frequency and voltage recovery characteristics providing insights into strategies for enhancing grid stability in high-renewable contexts.

Full Thesis translated from the original Korean language to English :

https://www.mediafire.com/file/ntj1bpziplb37cj/EvaluationoftheGridformingInverterinterconnectedsystemstability.pdf/file 

Understanding the insertion loss of filters in power electronics applications By Min Zhang, Founder and Principal EMC Consultant, Mach One Design

 

Étude de topologies de convertisseurs pour l'interconnexion d'un système d'électrification ferroviaire à courant continu moyenne tension et du réseau public de transport d'électricité- Luc Bimmel -Thèse présentée et soutenue, le 20 février 2026 par Luc BIMMEL

 

Étude de topologies de convertisseurs pour l'interconnexion d'un système d'électrification ferroviaire à courant continu moyenne tension et du réseau public de transport d'électricité- Luc Bimmel 

-Thèse présentée et soutenue, le 20 février 2026 par Luc BIMMEL École doctorale GEETS - Génie Electrique Electronique,Télécommunications et Santé : du système au nanosystème Spécialité Génie Electrique Unité de recherche LAPLACE - Laboratoire PLAsma et Conversion d'Énergie 

RESUME 

En France, 28 % des émissions de gaz à effet de serre proviennent du transport des personnes. A titre de comparaison, les émissions du transport ferroviaire par passager-kilomètre représentent en moyenne un cinquantième de celles du transport aérien. L’accroissement du trafic ferroviaire est donc le meilleur moyen de réduire les déplacements en avion sur les courtes et moyennes distances. Aujourd’hui, les lignes électrifiées en courant continu sont pénalisées par leur niveau de tension relativement bas, 1,5 kV ou 3 kV selon les pays. Pour des niveaux de puissance de quelques MW, les courants absorbés par les trains sont de plusieurs kA. Des travaux antérieurs ont conduit à proposer un renforcement du système d’électrification existant par des transformateurs électroniques alimentés par un feeder MVDC déployé le long de la ligne ferroviaire. Une partie de l’énergie électrique destinée à l’alimentation des trains transite alors par le feeder MVDC et permet de diminuer le courant dans la caténaire et de réduire ainsi les pertes. Le projet RACCOR-D (Réseau ferroviaire À Courant COntinu intelligent pour le veRdissement De l’énergie électrique) dans lequel s’est positionné ce travail de thèse a été financé dans le cadre du programme France 2030. Celui-ci repose sur l’utilisation du feeder MVDC pour interconnecter des sources d’énergie renouvelable et des systèmes de stockage d’énergie électrique avec le système d’électrification ferroviaire. Lors des périodes de faible trafic, ce « smart-grid ferroviaire » peut alors fournir de la puissance au réseau public de transport d’électricité à condition que les sous-stations d’alimentation du feeder MVDC soient équipées de convertisseurs réversibles. Le premier chapitre de cette thèse présente le principe de l’électrification ferroviaire et détaille les différents systèmes utilisés en Europe. Une attention particulière est portée sur l’élévation de la tension DC. Par la suite, le principe des sous-stations réversibles est introduit. Le deuxième chapitre présente une comparaison entre différentes topologies d’onduleurs trois niveaux susceptibles de réaliser la sous-station réversible alimentant le feeder MVDC. Compte du niveau de tension souhaité, entre 6 kV et 9 kV, une association série de deux onduleurs à IGBT est retenue. Une étude analytique portant sur le calcul des pertes est effectuée pour les topologies ANPC (Active Neutral Point Clamped) et FC (Flying Capacitor). Les limites de fonctionnement des onduleurs sont alors calculées et comparées. Les différents résultats amènent à retenir la topologie FC. Le troisième chapitre est consacré au fonctionnement de la sous-station réversible qui sera basée sur une association de redresseurs à diodes et d’onduleurs de tension FC. Une analyse du comportement dynamique de la sous-station est effectuée.

ORIGINAL LINK: https://hal.science/tel-05605028v1 

LINK THESIS : https://theses.hal.science/tel-05605028v1/file/BIMMEL_Luc.pdf 

【ESSERC 2025】Projeto Detalhado de Chips de Gerenciamento de Energia: LDO/Buck/Híbrido (Prof. Bernhard Wicht) [Legendas em Chinês e Inglês]

 

Electrical Circuit Analysis Por Uday A. Bakshi, Late Ajay V. Bakshi

 

Лекции по теории цепей-Lectures on Circuit Theory-Год издания: 1991 Автор: С. И. Баскаков Жанр или тематика: Электротехника-Year of publication: 1991 Author: S.I. Baskakov Genre or subject: Electrical engineering

 Lectures on Circuit Theory 30285K (download pdf) 1991 edition (follow) Added: 10.03.2024 Cover image Abstract 

Year of publication: 1991

 Author: S.I. Baskakov 

Genre or subject: Electrical engineering Publisher: Moscow Power Engineering Institute Publishing House ISBN: 978-5-7046-0027-1

 Language: Russian

 Format: PDF

 Description: A systematic presentation of the course material "Fundamentals" "Circuit Theory" in accordance with the modern university curriculum. Methods for analyzing stationary harmonic modes of linear circuits, the theory of four-terminal networks, the characteristics of frequency-selective circuits and filters, and the fundamentals of nonlinear circuit theory are discussed. Methods for determining the response of a linear circuit to pulsed influences are examined in detail. The theory of circuits with distributed parameters is presented. Methods for synthesizing linear two-terminal networks are discussed. A separate chapter is devoted to the use of computers for calculating complex circuits. For students majoring in radio engineering at universities.

ORIGINAL LINK: http://flibusta.site/b/775497/download 

ALTERNATIVE LINK 1:https://www.mediafire.com/file/xe0kppe8zhtu4g9/Baskakov.pdf/file 

ALTERNATIVE LINK 2:https://mega.nz/file/MQ1E2Cga#ZGURJ0wtbOm3inwijscEdhvyHprUlWclIDxNNvBuW-w 

A Deep Reinforcement Learning Approach to DC-DC Power Electronic Converter Control with Practical Considerations-Nafiseh Mazaheri * , Daniel Santamargarita , Emilio Bueno , Daniel Pizarro and Santiago Cobrece

A Deep Reinforcement Learning Approach to DC-DC Power Electronic Converter Control with Practical Considerations Nafiseh Mazaheri * , Daniel Santamargarita , Emilio Bueno , Daniel Pizarro and Santiago Cobreces Department of Electronics, Alcalá University (UAH), Plaza San Diego S/N, 28801 Madrid, Spain

Abstract: In recent years, there has been a growing interest in using model-free deep reinforcement learning (DRL)-based controllers as an alternative approach to improve the dynamic behavior, efficiency, and other aspects of DC–DC power electronic converters, which are traditionally controlled based on small signal models. These conventional controllers often fail to self-adapt to various uncertainties and disturbances. This paper presents a design methodology using proximal policy optimization (PPO), a widely recognized and efficient DRL algorithm, to make near-optimal decisions for real buck converters operating in both continuous conduction mode (CCM) and discontinuous conduction mode (DCM) while handling resistive and inductive loads. Challenges associated with delays in real-time systems are identified. Key innovations include a chattering-reduction reward function, engineering of input features, and optimization of neural network architecture, which improve voltage regulation, ensure smoother operation, and optimize the computational cost of the neural network. The experimental and simulation results demonstrate the robustness and efficiency of the controller in real scenarios. The findings are believed to make significant contributions to the application of DRL controllers in real-time scenarios, providing guidelines and a starting point for designing controllers using the same method in this or other power electronic converter topologies. 

ORIGINAL LINK: https://www.mdpi.com/1996-1073/17/14/3578 

NORMAS INTERNACIONAIS E NACIONAIS ESPECIFICAS QUE DEVEM TER OS UPS ONLINE PARA APLICAÇOES EM HOSPITAIS E EM SALAS DE CIRURGIA E TI

 

VER O ARTIGO COMPLETO:

 https://www.mediafire.com/file/0j0pag27e3amie8/NORMAS+INTERNACIONAIS+E+NACIONAIS+ESPECIFICAS+QUE+DEVEM+TER+OS+UPS+ONLINE+PARA+APLICAÇOES+EM+HOSPITAIS+E+EM+SALAS+DE+CIRURGIA+E+TI.pdf/file

Inertia Supervision for BESS Grid-forming Inverter TESI DI LAUREA MAGISTRALE IN Electrical ENGINEERING INGEGNERIA Elettrica Author: Seifeldin Nafea-POLITECNICO MILANO

Inertia Supervision for BESS Grid-forming Inverter TESI DI LAUREA MAGISTRALE IN Electrical ENGINEERING INGEGNERIA Elettrica Author: Seifeldin Nafea 

 Introduction 

 In recent years, the renewable energy generation started to rise dramatically for most countries. In Europe, following the introduction of the renewable energy directive 2009/28/EC, the region increased the share of renewable energies in energy consumption to 20% by 2020, according to Eurostat [1]. Out of such energy consumption, 23% was consumed by the electricity sector as the second highest source of energy consumption [1]. Nevertheless, renewable energy generation is expected to continue rising in the coming years as part of the decarbonization plan. The directive EU/2018/2001 has set the renewable energy target to reach 32% by the year 2030 [2]. Subsequently, a provisional agreement was accepted to raise that target to at least 42.5%, with an aim for 45% [2]. The Continuous rise of renewable generation in the electricity sector can cause some problems for the grid, which need to be addressed. In traditional power systems, the synchronous generator is the main source offering support to the grid through its kinetic energy and governor control. The synchronous machine has the capability to participate in the primary frequency control using the governor speed control mechanism and dampen the system dynamics through its inertia. However, the power converters connecting renewables with the grid do not possess such capabilities. In fact, their control structure is more focused on extracting the maximum power from the renewable source. With the growth of renewable energy sources, the use of synchronous machines is expected to decline, hence decreasing the system inertia and support [3]. Remarkable efforts are focused on developing a control approach that allows power converters to mimic the behavior of a synchronous machine. A captivating control family has emerged, called ‘Grid-forming Inverters,’ allowing the inverters to provide some of the synchronous machine functionalities like primary frequency control, oscillation damping, and contributing to system inertia. This control methodology is best suited to be implemented with batteries. The high ramp rate along with power and energy characteristics of batteries ensures compliance with the control output power signals. The grid-forming presents multiple control approaches [10], with the utmost attention focused on the so called “Virtual Synchronous Machine”. It directs the power converters to act in a similar manner to a synchronous generator, thus providing all its functions mentioned above.

FULL THESIS: https://www.politesi.polimi.it/retrieve/ba4f7e7c-20a1-4e1f-8f4b-e57e7549afc7/Inertia%20Supervision%20for%20BESS%20Grid%20Forming%20Inverter.pdf

M-ulti-objective operation strategy for a PV-integrated hybrid UPS-ESS using predictive heuristics and receding-horizon control-Seong-Soo Jeong-Department of Electrical and Computer Engineering The Graduate School Sungkyunkwan University

 

Abstract 

 A Multi-Objective Operation Strategy for a PV-Integrated Hybrid UPS–ESS using Predictive Heuristics and Receding-Horizon Control In recent industry, the adoption of renewable energy using photovoltaics (PV) has been promoted as part of efforts to address climate change. In precision manufacturing facilities, an uninterruptible power supply (UPS) is required to respond to momentary voltage sags and outages, and an energy storage system (ESS) is essential to compensate for the intermittent output of PV. Accordingly, this study investigates a multi-objective control strategy for a hybrid UPS–ESS (HUE) system integrated with PV. Short-term forecasts of load and PV generation are performed using a Long Short-Term Memory (LSTM) model. Based on these forecasts, the minimum state of charge (SOC) required to secure HUE reserve power and the target SOC for system operation are calculated at each time step. Subsequently, the weights of each objective function are derived using Multi-Criteria Decision Making (MCDM), and a real-time operation strategy is constructed by combining predictive heuristics and Receding-Horizon Control (RHC). The predictive heuristic determines charge and discharge actions under operational constraints, while RHC updates the control decision at each time step by incorporating both forecasted and actual values. The proposed control aims to maintain an adequate SOC headroom for UPS readiness, suppress grid peaks to reduce electricity costs, and limit unnecessary SOC fluctuations that accelerate battery degradation. Simulation results demonstrate that the proposed multi-objective operation strategy combining predictive heuristics and RHC outperforms the comparison scenarios in terms of SOC stability, grid operation reliability, and cost efficiency.

Development of Large-Scale Seawater Battery Cells for High Energy Density-저자 Youngjin Kim 발행사항 울산 : Ulsan National Institute of Science and Technology, 2023 학위논문사항 학위논문(박사) -- Ulsan National Institute of Science and Technology , Engineering Energy Engineering (Battery Science and Technology) , 2023

 

ABSTRACT Lithium-ion batteries (LIBs) are the most widely used rechargeable energy storage systems. However, the future expanding of the LIB technology is limited due to the high cost and scarcity of both core elements of lithium and cobalt. The use of cheap earth-abundant metals such as sodium, aluminum, potassium, calcium, and magnesium in their corresponding metal-based batteries which working on the same principle as LIBs, would greatly reduce the cost of battery technology. Nevertheless, despite the economic advantage of production process, the large-scale production of these metal-based batteries have been limited by their lower gravimetric and volumetric energy densities. Rechargeable seawater batteries (SWBs) are regarded as sustainable alternatives to Li-ion batteries due to the use of an unlimited and free source of Na ion active materials. Although many approaches including the introduction of new catalysts have successfully improved the performance of SWBs, reconsidering the cell design is an urgent requirement to improve the performance and scale up the production of practical batteries. In this study, by adjusting the maximum space efficiency, a rectangular cell is developed which due to its unique architecture, benefits from optimized contact to improve the overall charge transfer in the system. In view of the rigidity of the solid electrolyte, the novel cell model is intended to have adequate flexibility to be easily transported and practically utilized. At the same time as the development of the cell platform, energy efficiency was also improved by improving the materials and assembly methods for each part of the seawater battery, which will be an indicator for future battery development. Furthermore, the enhanced efficiency of the parallel stacked modules, indicates the capability of this cell in practical use. The seawater battery module was actually operated in the ocean to prove its potential, and an automated pilot design for uniform cell production was also carried out. The designed catalyst-free cell system shows a record capacity of 3.8 Ah (47.5 Ah kg−1), energy of 11 Wh (137.5 Wh kg−1), and peak power of 523 mW for individual unit cell, while it also retains performance up to 100 cycles. This design paves the way for commercializing rechargeable seawater batteries.

ORIGINAL LINK: 

https://www.riss.kr/search/detail/DetailView.do?p_mat_type=be54d9b8bc7cdb09&control_no=b3b401c8481ee0b7ffe0bdc3ef48d419&keyword=BATTERY%20%20UPS%20%20IN%20PARALLEL

Full-scale Shaking Table Test of Uninterruptible Power Supply Installed in 2-stories Steel Structure 2-층 철골 구조물에 설치된 무정전전원장치의 실규모 진동대 실험연구-Lee, Ji-Eon ; Park, Won-Il ; Choi, Kyoung-Kyu (Department of Architecture Engineering, Soongsil University) ; Oh, Sang-Hoon ; Park, Hoon-Yang)KOREA

 

Full-scale Shaking Table Test of Uninterruptible Power Supply Installed in 2-stories Steel Structure 2층 철골 구조물에 설치된 무정전전원장치의 실규모 진동대 실험연구 Lee, Ji-Eon ; Park, Won-Il ; Choi, Kyoung-Kyu (Department of Architecture Engineering, Soongsil University) ; Oh, Sang-Hoon ; Park, Hoon-Yang 

이지언 (숭실대학교 건축학부) ; 박원일 (숭실대학교 건축학부) ; 최경규 (숭실대학교 건축학부) ; 오상훈 (부산대학교 건축공학과) ; 박훈양 ((주) 에너테크 기술연구소 Korea Institute for Structural Maintenance Inspection (한국구조물진단유지관리공학회) 

 Abstract

 In this study, the shaking table tests were carried out on six types of non-structural elements installed on a full-scale two-story steel structure. The shaking table tests were performed for non-structural elements with and without seismic isolators. In this study, the seismic performance of Uninterruptible Power Supply (UPS) specimens was tested and investigated. Non-seismic details were composed of conventional channel section steel beams, and the seismic isolators were composed of high damping rubber bearing (HDRB) and wire isolator. The input acceleration time histories were artificially generated to satisfy the requirements proposed by the ICC-ES AC156 code. Based on the test results, the damage and dynamic characteristics of the UPS with the seismic isolator were investigated in terms of the natural frequency, damping ratio, acceleration time history responses, dynamic amplification factors, and relative displacements. The results from the shaking table showed that the dynamic characteristics of the UPS including the acceleration response were significantly improved when using the seismic isolator. 본 연구에서는 실규모의 2층 철골 구조물에 7종의 건축 및 비건축 비구조요소를 설치하여 진동대 실험을 수행하였다. 진동대 실험은 현행 비내진상세와 면진장치를 적용한 실험으로 두 차례 수행되었으며 본 연구에서는 무정전전원장치(UPS)의 내진성능에 대하여 실험 및 분석하였다. 비내진정착상세로는 UPS 하단에 ㄷ형강 다리부가 설치되었고, 면진장치로는 고감쇠고무와 와이어로프로 구성된 개발 복합면진장치가 사용되었다. 지진하중모사를 위하여 ICC-ES AC156 (2010)에 따라 인공지진파를 생성 후, 동일 지진파의 크기를 점증하여 가진하였다. 진동대실험을 통해 복합면진장치의 적용여부에 따른 UPS의 거동 및 동적 특성(응답가속도, 응답변위, 동증폭계수, 고유진동수, 감쇠비)을 비교 및 분석하였다. 실험결과, 복합면진장치를 적용함에 따라 UPS의 고유진동수가 감소하여 응답가속도 및 증폭계수가 크게 감소하는 것으로 확인되었다.

 ORIGINAL LINK KOREA:https://koreascience.kr/article/JAKO202220362436736.pub

ENGLISH TRANSLATED VERSION :

https://www.mediafire.com/file/w9fmh000y32rgny/Full-scale+Shaking+Table+Test+of+Uninterruptible+Power+Supply+Installed+in+2-stories+Steel+Structure.en.dual.pdf/file

TRANSLATED VERSION INTO PORTUGUESE:

https://www.mediafire.com/file/xc2aeuquo8ja1c7/Full-scale+Shaking+Table+Test+of+Uninterruptible+Power+Supply+Installed+in+2-stories+Steel+Structure.pt-BR.dual.pdf/file

A SYSTEM FOR STATE-OF-HEALTH DIAGNOSIS OF LEAD-ACID BATTERIES INTEGRATED WITH A BATTERY CHARGER Telles B. Lazzarin1 and Ivo Barbi2 1Federal Institute of Santa Catarina (IFSC), Florianópolis - SC, Brazil 2Federal University of Santa Catarina (UFSC), Florianópolis - SC, Brazil

 

A SYSTEM FOR STATE-OF-HEALTH DIAGNOSIS OF LEAD-ACID BATTERIES INTEGRATED WITH A BATTERY CHARGER 

Author Telles B. Lazzarin1 and Ivo Barbi

 Abstract – This paper reports a theoretical and experimental study on a proposal for a lead–acid battery charger applied in UPS, which has an integrated on-line test system to determine the state-of-health (SoH) of the batteries. The charger control structure is designed to ensure an appropriate charge for every battery in the pack. The battery evaluation system is based on historical analysis of the periodic measurements, such as internal impedance, DC voltage and operation temperature, performed for each battery. The periodic monitoring of these parameters provided by the integration of systems eliminates the disadvantages of online tests and thus allows the user to analyze the batteries adequately. The structure was experimentally verified on a prototype, where the battery SoH diagnosis system was integrated with a 1.5 kW battery charger. The system was designed for a bank of sixteen batteries associated in series.

LINK : https://journal.sobraep.org.br/index.php/rep/article/view/398/358