Institut für Elektrische Anlagen und Netze, Digitalisierung und Energiewirtschaft Lehrstuhl für Aktive Energieverteilnetze Einfluss netzbildender Umrichter auf die ungewollte Teilnetzbildung in Verteilnetzen

Erläuterung zum Dokument Die Inhalte dieses Berichts sind im Rahmen der wissenschaftlichen Studie „Technisch- wirtschaftliche Auswirkungen netzbildender Umrichter im Hinblick auf die ungewollte Teil- netzbildung in Verteilnetzen” entstanden, die das IAEW der RWTH Aachen University im Jahr 2023 im Auftrag der Westenergie AG durchgeführt hat. Das vorliegende Dokument beschreibt Teilergebnisse dieser Studie in Form von grundlegenden technischen Voruntersu- chungen zum Einfluss netzbildender Umrichter auf die Wahrscheinlichkeit der ungewollten Teilnetzbildung in elektrischen Verteilnetzen. Das Institut für Elektrische Anlagen & Netze, Digitalisierung & Energiewirtschaft (IAEW) gehört zur Fakultät für Elektrotechnik und Informationstechnik der RWTH Aachen Univer- sity. Unter der Leitung von Univ.-Prof. Dr. sc. A. Ulbig, Univ.-Prof. Dr. W. Leterme und Univ.-Prof. Dr.-Ing. A. Moser bilden mathematische Simulationen, Optimierungen und die Bewertung des technisch-wirtschaftlichen Ausbaus und Betriebs von Energieversorgungssys- temen Schwerpunkte in Forschung, Lehre und Industrieprojekten am IAEW. Das Institut hat in Deutschland und im europäischen Ausland eine Reputation in der professionellen und verständlichen Kommunikation energiewirtschaftlicher und netztechnischer Sachverhalte er- worben und ist als objektiver Gutachter in strategischen Fragen – auch gegenüber Regulie- rungsbehörden – anerkannt. Der Fokus am Lehrstuhl für Aktive Energieverteilnetze gilt insbe- sondere der Konzipierung sowie der simulativen und labortechnischen Analyse zukunftsfähiger dezentraler Energiesysteme. Durch langjährige Erfahrung in der Markt-, Netz- und System- analyse verfügt der Lehrstuhl über detaillierte Kenntnisse zur Bewertung von Potenzialen der Sektorenkopplung auf Verteilnetzebene, Netzausbaumaßnahmen und resilientem Netzbe- trieb, dezentralen Geschäftsmodellen, Chancen digitaler Technologien und Infrastrukturen, Schutzkonzepten und Stabilitätsanalysen mit einer objektiven Ergebnisinterpretation.

FULL PAPER: https://d-nb.info/1335581138/34 

Transformadores de Potencia confiables : Especificaciones Técnicas y Resistencia de Corto circuito-COLEGIO DE INGENIEROS DEL PERU-CIP-LIMA

 

Transformadores de potencia confiables : Especificaciones Tecnicas y Resistencia de Corto circuito-Charla tecnica dirigida :

 Ingeniero Richard Piscoya Rodriguez (ing. Mecanico Eléctrico UNI LIMA -PERU)-HITACHI Energy -Ingeniero Hector Gozales Yamashiro (Ingeniero Eléctrico (UNMSM-LIMA-PERU)-Hitachi energy Organizado por el COLEGIO DE INGENIEROS DEL PERU=CIP-LIMA

Podcast ABDC | Vice-presidente Luis Tossi recebe Aluizio Abdom, Diretor Comercial da Engetron

 

Quero compartilhar com todos o excelente podcast feito pelo Eng,Luis Tossi ao diretor de Engentron Sr.Aluizio Abdom esta empresa Brasileira foi fundada em 27 de dezembro de 1976 e referência na fabricação de UPS online senoidales ,acompanho desde 1990 as pesquisas e desenvolvimentos de seu produtos,totalmente nacional,hardware e software brasileiro com convenios com Universidades brasileiras.

ABDC - Brazilian Data Centers Association Durante a 22ª edição do Happy Hour da ABDC - Brazilian Data Centers Association,o vice-presidente Eng. Luis Tossi recebeu Aluizio Abdom A., Diretor Comercial e de Marketing da Engetron. No bate-papo, Aluízio compartilha a trajetória da Engetron, empresa brasileira que completa 50 anos de atuação no mercado de UPS, destacando sua especialização no desenvolvimento e fabricação de soluções de energia para ambientes críticos. A conversa também aborda inovação tecnológica, fabricação nacional, integração com universidades e os novos desafios do setor de data centers. O episódio traz ainda novidades da empresa para o mercado, reforçando a importância da confiabilidade energética para a infraestrutura digital e o papel das soluções de energia no crescimento do setor de data centers no Brasil. 

 

Fonte de alimentação de 3000 W com refrigeração líquida (usando GaN e SiC) - ElectrArc240

 

ORIGINAL SOURCE : ElectrArc240

Implementation and Analysis of Grid Support Function for a Smart Inverter-by Seon-Haeng Lee- Aju National University Graduate School Department of Electronic Engineering

Implementation and Analysis of Grid Support Function for a Smart Inverter Advisor: Kyo-Beom Lee Submitted as a Master's Thesis in Engineering February 2022 Aju National University Graduate School Department of Electronic Engineering by  Seon-Haeng Lee 

Abstract Sun-Hang Lee Electrical and Computer Engineering Graduate School Ajou University This thesis implements and analyzes a grid support function for a smart inverter. Due to environmental and air pollution issues, the installation of distributed power using renewable energy has been increased. However, various problems arise when power converters with various output characteristics are connected to the system. Therefore, it is necessary to control the output of the inverter according to the voltage and frequency of the grid. This is called a grid support function which is mandatory to install the function in some countries. The inverter equipped with a grid support function is called the smart inverter. In order to utilize various functions, the smart inverter consists of three boards. First, the main control is a DSP board which is equipped with DSP. The main control system is required a digital processor for fast and accurate control. Also, it is necessary to share information with communication equipment. The second is a breaker control board for connection between the grid and distributed power output. Finally, a sensing board that receives various analog information including voltage and current sensors is required. The grid support function for the smart inverter is implemented and analyzed through simulation and experimental results.

Original link:https://www.riss.kr/search/detail/DetailView.do?p_mat_type=be54d9b8bc7cdb09&control_no=8054e07049d75b93ffe0bdc3ef48d419&keyword=Implementation%20and%20Analysis%20of%20Grid%20Support%20Function%20for%20a%20Smart%20Inverter

Alternative link 1:https://www.mediafire.com/file/uq1cnzumozfyy5c/Implementation+and+Analysis+of+grid+support+function+foa+a+smart+inverter.pdf/file 

Alternative link 2: https://mega.nz/file/lddl1b7a#UO7ul5iuuPiByl0sQw4Ows_i0r6OGYtavoRFDvRU83c 

UNMSM -LIMA-PERU : SAN MARCOS DA LA BIENVENIDA A INGRESANTES 2026-II DE INGENIERÍA ELECTRÓNICA Y ELÉCTRICA

 ¡San Marcos recibe a la futura generación de ingenieros! ⚡🎓 La Facultad de Ingeniería Electrónica y Eléctrica de la Universidad Nacional Mayor de San Marcos dio la bienvenida a 375 ingresantes, quienes inician su camino hacia la excelencia y la innovación. 🚀💡 Durante la ceremonia, autoridades destacaron la formación de profesionales altamente capacitados, y se reconoció a los primeros puestos del examen de admisión. 🏅 Así, San Marcos reafirma su compromiso de formar líderes que transformarán el futuro del país

Projeto De Circuitos De Fonte Chaveada Teste de Circuito de Controle Bode

계통 연계 직류 지역망을 위한 양방향 인터링킹 AC/DC 컨버터의 분산형 DC 전압 기반 그리드 포밍 제어기 설계 및 분석 = Design and Analysis of Distributed DC Voltage based Grid Forming Controller for Bidirectional Interlinking AC/DC Converter in Grid-connected DC Local Grid

계통 연계 직류 지역망을 위한 양방향 인터링킹 AC/DC 컨버터의 분산형 DC 전압 기반 그리드 포밍 제어기 설계 및 분석 = Design and Analysis of Distributed DC Voltage based Grid Forming Controller for Bidirectional Interlinking AC/DC Converter in Grid-connected DC Local Grid

Advisor: Professor Raeyoung Kim This thesis is submitted for the Master's degree in Engineering. Hanyang University Graduate School Department of Electrical Engineering 

AUTHOR:Jinwoo Jeong

ABSTRACT This paper proposes and analyzes a distributed DC-voltage-based grid-forming control method for a bidirectional interlinking AC/DC converter to address operational challenges in grid-connected DC Local Grids under weak grid conditions. The proposed method adjusts the DC voltage reference based on AC active power output to perform DC Voltage Droop control while integrating a synchronization controller designed through small-signal modeling to enhance stability. To mitigate Synchronous Oscillation (SO) issues caused by the coupling of DC Voltage Droop and grid-forming control, a Notch Filter was introduced. The proposed method was validated through PLECS and PSCAD simulations, demonstrating stable voltage control and power sharing under both strong (SCR=5) and weak (SCR=2) grid conditions. Compared to conventional Grid-Following control, the proposed approach offers improved stability in weak grids while ensuring proper power sharing, enhancing the reliability and flexibility of DC Local Grids. 

ORIGINAL LINK: https://www.riss.kr/search/detail/DetailView.do?p_mat_type=be54d9b8bc7cdb09&control_no=8d3b7774163776b8ffe0bdc3ef48d419 

ALTERNATIVE LINK: https://www.mediafire.com/file/hnotk10a8h2fofy/Design+and+Analysis+of+Distributed+DC+Voltage+based+Grid+Forming+Controller+for+Bidirectional+Interlinking+ACDC+Converter+in+Grid-connected+DC+Local+Grid.pdf/file 

Research on Control Strategy of Single-phase LCL-Type Grid-Connected Inverter based on Composite Repetitive Control -복합 반복제어에 기반한 단상 LCL-계통연계 인버터의 제어 전략에 관한 연구

Research on Control Strategy of Single-phase LCL-Type Grid-Connected Inverter based on Composite Repetitive Control 

A Dissertation Submitted to the Department of Electronic Engineering and the Graduate School of Cheongju University in partial fulfillment of the requirements for the degree of Doctor of Engineering 

AUTHOR:Fen Liang (양분)

ABSTRACT With the rapid development of new energy generation technologies such as photovoltaic and wind power, the distributed power generation system (DPGS) based on renewable energy has attracted more and more attention all over the world. Grid- connected inverters, as an essential component of DPGS, play an important role in converting DC into AC between photovoltaic, wind power equipment, and the power grid. However, a lot of harmonics are generated by the dead time of the grid-connected inverter, the background harmonics from the grid voltages, nonlinear loads, etc., resulting in poor control performance, high total harmonic distortion (THD), additional power loss, and even system instability. Therefore, improving the quality of current and researching high-quality current control technologies for grid-connected inverters are of great significance. Repetitive control (RC) is widely used in grid-connected inverter control systems due to its excellent harmonic suppression performance. To improve the output current quality of the grid-connected inverter and improve the robustness and control accuracy of the system, this dissertation takes a single-phase grid-connected inverter as an application target, adopts composite repetitive control technology to reduce harmonics content in the output current of the grid-connected inverter. The main works of this dissertation are as follows. (1) A single-phase LCL-type grid-connected inverter model is created, and the parameters of the LCL filter are designed. Furthermore, to eliminate the resonant peaks generated by the LCL filter, various damping strategies are compared and analyzed. (2) By analyzing the principles, stability, harmonic suppression ability of the conventional repetitive control (CRC), and advantages of proportional-integral (PI) control, the composite repetitive controller composed of RC and PI in series or in parallel structures is introduced. Furthermore, taking the proportional integral multi- resonant repetitive control (PIMR-RC) composed of RC and PI in parallel as an example, parameters design, steady-state response, and dynamic performance analysis are conducted in detail. (3) The fundamental frequency of the power grid may fluctuate at ±0.5 Hz in DPGSs, and the ratio N is the sampling frequency to the fundamental frequency of the power grid may be a fraction. However, CRC has excellent control performance only N is an integer, or it will result in a significant decrease in signal tracking and harmonic suppression performance. To ensure that the repetitive controller can accurately track reference current even when the grid frequency fluctuates and to reduce computational load and memory consumption, based on a Farrow-structure filter, a fractional-order delay PIMR-RC (FOD-PIMR-RC) scheme is proposed, which greatly improve the quality of the grid current against frequency fluctuations. Then, the stability analysis and the harmonic suppression performance of the proposed scheme are analyzed. Finally, the simulation results demonstrate the effectiveness of the proposed scheme. (4) To reduce the computational load and memory consumption, multirate repetitive control (MRC) is adopted in the PIMR-RC system for grid-connect inverters. Although MRC provides a flexible and efficient design solution, it usually adopts a downsampling rate approach. CRC with integer-order phase lead compensation cannot exactly compensate for the system phase lag, which may result in an unstable system in the case of low sampling frequency. Therefore, a fractional-order phase lead PIMR-MRC (FOPL-PIMR-MRC) scheme, employing an infinite impulse response (IIR) filter, is presented for grid-connected inverters. The proposed scheme includes the design of a fractional-order phase lead compensation filter, along with stability analysis, parameter design, and comprehensive simulation analysis. The steady-state and dynamic simulation results confirm that the proposed control scheme effectively achieves accurate phase compensation, enhances the stability margin of the system, and reduces hardware consumption. Additionally, it ensures excellent performance in harmonic suppression.

ORIGINAL LINK: 

https://www.riss.kr/search/detail/DetailView.do?p_mat_type=be54d9b8bc7cdb09&control_no=eac0d4320214a784ffe0bdc3ef48d419&keyword=Inverter%20Control%20Strategies%20for%20a%20Grid%20Stabilizing

ALTERNATIVE LINK:

https://www.mediafire.com/file/7k5udulzfe1zti9/Research+on+Control+Strategy+of+Single-phase+LCL-Type+Grid-Connected.pdf/file

APEC 2022, Houston, TX, USA Next-Generation Datacenter MV Interfaces — Will Solid-State Transformers Meet Their Waterloo?

 APEC 2022, Houston, TX, USA

Next-Generation Datacenter MV Interfaces — Will Solid-State Transformers Meet Their Waterloo?

  

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

  전력가스화 (P2G) 시스템에서 계통 안정화를 위한 인버터 제어기법 Tech University of Korea

  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.

ORIGINAL LINK:  

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

 ALTERNATIVE LINK:https://www.mediafire.com/file/wx16ob1ycexs50b/Inverter+Control+Strategies+for+a+Grid+Stabilizing+Power-to-Gas+System.pdf/file

 

Performance Comparison of Droop Control and VSG Control for Grid Forming Inverter = 그리드 포밍 인버터를 위한 드룹 제어와 가상 동기 발전기 (VSG) 제어의 성능 비교 by Thapyay Hlaing-Kwangwoon University South Korea

 

Performance Comparison of Droop Control and Virtual Synchronous Generator (VSG) Control for Grid Forming Inverters

 Advisor: Professor Minhan Yoon Submitted for the Master's Degree in Electrical Engineering July 1, 2025 Kwangwoon University Department of Electrical Engineering Thapyay Hlaing

 ] 그리드 포밍 인버터를 위한 드룹 제어와 가상 동기 발전기 (VSG) 제어의 성능 비교 Performance Comparison of Droop Control and VSG Control for Grid Forming Inverter 지도교수 윤민한 이 논문을 전기공학 석사학위논문으로 제출함 2025년 7월 1일 광운대학교 전기공학과 Thapyay Hlaing

 ABSTRACT As the growing integration of renewable energy sources, inverter-based resources (IBRs) becoming new challenges for power system stability. This brings new contests to maintain system stability. The inverter that lacks inertia and making the grid more sensitive to disturbances, especially under weak grid conditions. The thesis offers a detailed performance comparison between droop control and VSG control for grid-forming inverters. The wide-spread simulation-based testing was conducted under various scenarios, including steady state operations, load variations, and fault conditions such as low voltage ride through (LVRT). GFM inverters with droop control effectively regulate power sharing. This provides improved system stability by proportionally adjusting frequency and voltage responses. VSG control further improves dynamic behavior by mimicking the inertia and damping characteristics of synchronous generators, resulting in smoother transitions and stronger fault response. Each control strategy was evaluated for its ability to handle power deviations, share load among multiple inverters and maintain system stability under both normal and fault conditions. Therefore, the careful selection and tuning of inverter control methods are critical to ensure balanced grid support, reliable power sharing, and fault ride- through performance. Advanced GFM control strategies such as droop and VSG will play a central role in enabling stable and resilient grid operation.

View full Thesis: ORIGINAL LINK

 https://www.riss.kr/search/detail/DetailView.do?p_mat_type=be54d9b8bc7cdb09&control_no=071c02e876d833bcffe0bdc3ef48d419&keyword=inverter%20grid%20forming%20system

 ALTERNATIVE LINK : https://www.mediafire.com/file/ectvrvhzxyirakk/Performance+Comparison+of+Droop+Control+and+VSG+Control+for+Grid+Forming+Inverter.pdf/file

Fundamental of Power Electronics-24-1 High-Frequency Dynamics Controlled by Current Mode- Dr.Wang Haoyu-School of Information Science and Technology, ShanghaiTech University

 

Modeling and Control of Power Electronic Converters.

ShanghaiTech University Online English Course: Power Electronic Converter Modeling and Control Instructor:Professor Wang Haoyu 

{Haoyu Wang} (Senior Member, IEEE) received the bachelor's degree with distinguished honor in electrical engineering from Zhejiang University, Hangzhou, China, in 2009, and the Ph.D. degree in electrical engineering from the University of Maryland, College Park, MD, USA, in 2014. In September 2014, he joined the School of Information Science and Technology, ShanghaiTech University, where he is currently a Full Professor with tenure. In 2023, he was a visiting academic fellow at the University of Cambridge, UK. His research interests include power electronics, electric vehicles, renewable energy systems, and power management integrated circuits. Dr. Wang is an IET Fellow. He serves as an Associate Editor for IEEE TRANSACTIONS ON INDUSTRIAL ELECTRONICS, IEEE TRANSACTIONS ON TRANSPORTATION ELECTRIFICATION, and CPSS Transactions on Power Electronics and Applications. He was a Guest Editor for IEEE JOURNAL OF EMERGING AND SELECTED TOPICS IN POWER ELECTRONICS, and a Guest Associate Editor for IEEE TRANSACTIONS ON POWER ELECTRONICS.

Optimal Placement of Grid-Forming controlled Converters for Small Signal Stability Enhancement of Power Systems by Yahya Lamrani-THESE Présentée en vue d’obtenir le grade de DOCTEUR En Spécialité : Génie Électrique Par Yahya LAMRANI DOCTORAT DELIVRE PAR CENTRALE LILLE

 

CENTRALE LILLE THESE Présentée en vue d’obtenir le grade de DOCTEUR En Spécialité : Génie Électrique Par Yahya LAMRANI DOCTORAT DELIVRE PAR CENTRALE LILLE 

Titre de la thèse : Localisation optimale des convertisseurs grid forming sur les réseaux de transport pour l'amélioration de la stabilité petits signaux Optimal Placement of Grid-Forming controlled Converters for Small Signal Stability Enhancement of Power Systems

 

 Abstract The massive deployment of renewable energy sources in the context of the energy transition has brought new challenges to the power system. The integration of renewable energy is mostly achieved by means of power electronics. High Voltage DC (HVDC) links, wind and solar parks all utilize Voltage Source Converters (VSC) to connect to the power system. Conventionally, the VSCs are controlled using the Grid Following (GFL) scheme. This control mode is reported to challenge the Small-Signal Stability (SSS) of the power systems. Grid Forming (GFM) control has emerged as an alternative technology to counter the issues resulting from the increasing penetration of power electronics in modern and future power systems. This thesis aims to propose a method for estimating power system needs for GFM- controlled converters, and determining their optimal placement within the network to en- hance the system SSS. First, the stabilizing effect of GFM is highlighted; various types of GFM controls are tested under different operating points and in different networks. The stability analysis is conducted using a state-space model and then confirmed by Electromag- netic Transients (EMT) simulations. The results indicate that all GFM controls provide a stabilizing effect. However, this effect varies significantly: all things being equal, the use of a current loop in the control structure makes the GFM less stabilizing and less robust to network variations (topology, operating point, type of loads). To best exploit the established stabilizing GFM properties, an iterative methodology for placing GFM-controlled convert- ers is proposed. This approach relies on two main indicators: the Frequency Averaged Grid Impedance (FAGI) to identify the weakest system bus, and the Modal Non-Passivity In- dex (MnPI) to assess the system stability. Both tools are based on the impedance model of the network and converters, extended beyond the fundamental frequency. Using this methodology, the minimal volume of GFM converters to be installed and their placement is determined. A realistic case study is considered to test the methodology and to determine the network short- and long-term needs for GFM converters.

VIEW FULL THESIS: https://theses.hal.science/tel-04885327v1/file/Lamrani_Yahya_DLE.pdf 

Grid-Following and Grid-Forming Control in Power Electronic Based Power Systems: A Comparative Study Gao, Xian; Zhou, Dao; Anvari-Moghaddam, Amjad; Blaabjerg, Frede-AAU Energy Aalborg University Aalborg, DK-9220, Denmark

 

Grid-Following and Grid-Forming Control in Power Electronic Based Power Systems: A Comparative Study Xian Gao, Dao Zhou, Amjad Anvari-Moghaddam, and Frede Blaabjerg

 Abstract - The stability of frequency is at risk with increasing penetration of power electronic converters. In this case, the power grid will lack the moment of inertia to maintain a stable voltage and frequency in the event of a large disturbance. In order to improve the stability of the power grid, traditional grid-following control is needed to be transformed to grid-forming control. This paper analyzes the control structure of grid-following control and grid-forming control. Moreover, a case study is exemplified to compare the performance of two control strategies responding to frequency disturbances. Finally, a simulation model of 15 kW grid-connected converter is built in Matlab/Simulink to discuss the performance of the grid-following and grid-forming converters under different working conditions.

View full paper :https://vbn.aau.dk/ws/portalfiles/portal/452850850/Final_Grid_Following_and_Grid_Forming_Control_in_Power_Electronic_Based_Power_Systems_A_Comparative_Study.pdf 

Grid-forming control to achieve a 100% power electronics interfaced power transmission systems by Taoufik Qoria -”Nouvelles lois de contrˆole pour former des r´eseaux de transport avec 100% d’´electronique de puissance”

 

´ECOLE DOCTORALE SCIENCES ET M´ETIERS DE L’ING´ENIEUR L2EP - Campus de Lille TH`ESE pr´esent´ee par : Taoufik QORIA soutenue le : 5 Novembre 2020 pour obtenir le grade de : Docteur d’HESAM Universit´e pr´epar´ee `a : ´Ecole Nationale Sup´erieure d’Arts et M´etiers Sp´ecialit´e : G´enie Electrique Grid-forming control to achieve a 100% power electronics interfaced power transmission systems

 Résumé The rapid development of intermittent renewable generation and HVDC links yields an important increase of the penetration rate of power electronic converters in the transmission systems. Today, power converters have the main function of injecting power into the main grid, while relying on synchronous machines that guaranty all system needs. This operation mode of power converters is called "Grid-following". Grid-following converters have several limitations: their inability to operate in a standalone mode, their stability issues under weak-grids and faulty conditions and their negative side effect on the system inertia.To meet these challenges, the grid-forming control is a good solution to respond to the system needs and allow a stable and safe operation of power system with high penetration rate of power electronic converters, up to a 100%. Firstly, three grid-forming control strategies are proposed to guarantee four main features: voltage control, power control, inertia emulation and frequency support. The system dynamics and robustness based on each control have been analyzed and discussed. Then, depending on the converter topology, the connection with the AC grid may require additional filters and control loops. In this thesis, two converter topologies have been considered (2-Level VSC and VSC-MMC) and the implementation associated with each one has been discussed. Finally, the questions of the grid-forming converters protection against overcurrent and their post-fault synchronization have been investigated, and then a hybrid current limitation and resynchronization algorithms have been proposed to enhance the transient stability of the system. At the end, an experimental test bench has been developed to confirm the theoretical approach. 

VIEW FULL THESIS :https://theses.hal.science/tel-03078479v1 

DIRECT LINK: https://pastel.hal.science/tel-03078479v1/document 

Conception et pilotage de réseaux de convertisseurs génériques dans un contexte Smartgrids Antoine Bulteau

THÈSE Pour obtenir le grade de DOCTEUR DE L’UNIVERSITÉ GRENOBLE ALPES École doctorale : EEATS - Electronique, Electrotechnique, Automatique, Traitement du Signal (EEATS)

 Spécialité : GENIE ELECTRIQUE Unité de recherche : Laboratoire de Génie Electrique Conception et pilotage de réseaux de convertisseurs génériques dans un contexte Smartgrids Design and control of a network of generic cluster converters for Smartgrids Présentée par : Antoine BULTEAU

Summary The desire to integrate more renewable energy into the electrical grid necessitates an evolution in its architecture. This evolution will shift grid generation sources from centralized to decentralized production, facilitating and distributing the placement of renewable and intermittent generation sources across the grid. However, this decentralized integration raises a number of issues, notably the use of power electronics to facilitate access to these energy sources while simultaneously providing grid services. This thesis initially focuses on a pair of converters designed to address this grid

VIEW FULL THESIS: https://theses.hal.science/tel-04206778v1

 evolution and to perform potentially necessary grid services. This pair of converters is termed an energy router due to the grid services it offers.

Grid-forming control strategies of power electronic converters in transmission grids: application to HVDC link BY Ebrahim Rokrok

 

Grid-forming control strategies of power electronic converters in transmission grids : application to HVDC link Ebrahim Rokrok 

THESE présentée en vue d’obtenir le grade de DOCTEUR en Spécialité: Génie Électrique par Ebrahim Rokrok 

DOCTORAT DELIVRE PAR CENTRALE LILLE 

 Summary 

 The rapid development of converter-based devices such as converter-interfaced renewable generations and high-voltage direct-current (HVDC) transmission links is causing a profound change into the very physics of the power system. In this scenario, the power generation is shifted from the pollutant synchronous generators based on nuclear or fossil fuels to converter-based renewable resources. The modeling, control, and stability of the power converters are now one of the focuses of attention for researchers. Today, power converters have the main function of injecting power into the utility grid, while relying on synchronous machines that ensure all system needs (eg, ancillary services, provision of inertia and reliable power reserves). This operation mode of power converters is called "Grid-following". Grid-following converters have several limitations, such as: inability to operate in a standalone mode, stability issues under weak grids and faulty conditions and also, negative side effect on the system inertia. To tackle these challenges, the grid-forming control as an alternative has shown its appropriate performance that could make this kind of control a promising solution to respond to the system needs and to allow a stable and safe operation of power system with high penetration rate of power electronic converters. In this thesis, a fundamental description of grid-forming control with a simplified quasi-static modeling approach aiming to regulate the converter active power by a voltage source behavior is presented. From the description, several variants of grid-forming strategies are identified that represent some differences in terms of active power dynamic behavior, inertia emulation capability and system frequency support. Hence, the presented grid-forming variants are then classified according to their capabilities/functionalities. 

View Full Thesis : https://theses.hal.science/tel-04041405v1

DIRECT LINK  : https://theses.hal.science/tel-04041405v1/document

 ability to operate under very weak grid conditions. Moreover, the ancillary services such as inertial response and frequency support are appropriately provided to the AC grid.

The Theory Of Electromagnetic Field by K. Polivanov; P Ivanov (translator)-Теория электромагнитного поля К. Поливанова; П. Иванов (переводчик)

 

 

The Theory Of Electromagnetic Field by K. Polivanov; P Ivanov (translator) 

The theory of an electromagnetic field is a concluding subject in the curriculum of the theoretical training of electrical engineers. The field theory course usually follows the course in the basic theory of electric circuits. The author covers the basic aspects of the theory of an electromagnetic field within the restricted space so that the text can fit the interest of students and answer the practical engineering needs. The emphasis therefore is on the behavior of fer­ romagnetic bodies in an electromagnetic field and on the processes in real imperfect dielectrics and poor conductors. The text also gives strict definitions of the basic vec­ tors and shows the differences between them. Many of the aspects discussed in the book focus on the problems one has to deal with in electrical engineering practice. This is one of the factors that influenced the organization of the book and the manner of presentation of the material. A similar treatment of the field theory was also given in the book by A. Netushil and K. Polivanov The Theory o f Electromagnetic Field. Theoretical Principles o f Elec­ trical Engineering. Part 3 (Gosenergoizdat, in Russian). No effort has been made to cite a great number of contributors in this area. In the author's opinion, of many valuable texts, the following books will be very helpful to students in the study of the theory of electrical engineering: Analysis and Synthesis o f Electric Circuits (Mir Publishers) by G. Zeveke, P. Ionkin, A. Netushil, and S. Strakhov, The Feynman Lectures on Physics (Addison-Wesley) by R. Feynman, R. Leighton, and M. Sands, Electricity and Magnetism (McGraw-Hill) by E. Purcell that treats the effects of moving bodies in an electromagnetic Field, and Fundamentals o f the Theory o f Elec­ tricity (Mir Publishers) by I. Tamm.

LINK1:  https://archive.org/details/polivanov-the-theory-of-electromagnetic-field-mir-1983/page/206/mode/2up

BOOST ZVT PWM

 

MagNet Challenge 2 - Tutorial 4: Summary and Q&A by Minjie Chen - Princeton Power Electronics (ENGLISH AND PORTUGUESE VERSION)

 ENGLISH

 

PORTUGUESE 

BR MagNet Challenge 2 - Tutorial 5: New Models and Testing Methods by Shukai Wang - Princeton Power Electronics

 

ELETRÔNICA DE POTENCIA -OPTOCOUPLER E CIRCUITOS DE DISPARO E PROTEÇÃO DE DISPOSITIVOS DE POTENCIA-POWER ELECTRONICS - OPTOCOUPLER AND TRIGGER AND PROTECTION CIRCUITS FOR POWER DEVICES-Prof.Jingzhuo Shi-

 

VERSAO PORTUGUES

VERSAO INGLES

ACIONAMENTOS DE DISPOSITIVOS DE ELETRONICA DE POTENCIA (MOSFETS,IGBTS)

 

The Complete Production Process of Winded Soft-Pack Lithium-ion Batteries

 

This article details the complete production process of wound soft-pack lithium-ion batteries, from positive and negative electrode material coating, winding, tab welding, calendering and slitting, assembly and testing.

[Expert Report] Ding Lei, Shandong University: A Re-understanding of Power System Inertia

 

ELETRÔNICA DE POTÊNCIA-Retificador meia onda controlado a tiristor (RL)

 

Power Electronics in Renewable Energy Systems Suntio, Teuvo; Messo, Tuomas

 

ABSTRACT .The observed changes in weather conditions have accelerated the installation of renewable energy-based electricity systems around the world. Large-scale utilization of renewable energy sources in electricity production requires the use of power electronic converters to integrate the renewable energy systems into the power grids. This integration brings about certain challenges in terms of stability and robust performance of the power grids, which have to be solved before the wellbeing of the power grids can be guaranteed. This Special Issue of Energies aims to reveal the state-of-art in addressing interfacing problematics. According to the published papers, clear advancements have taken place, but the most critical issues remain unsolved. Direct power control with self-synchronizing synchronverters may be the most promising technique for solving the main stability problem, although many unsolved problems still persist. Another challenge in renewable energy production is the fluctuating nature of the available energy in renewable energy sources, which require utilization of stored energy to smooth the fluctuations. Different storage battery technologies are available, but their production may pose problems in the long term.

 ORIGINAL LINK:https://trepo.tuni.fi/handle/10024/225285

Dynamic Characteristics of Grid-Connected Three-Phase Z-Source Inverter in Photovoltaic Applications-Tampere University of Technology-Author Juha Jokipii

 Juha Jokipii Dynamic

 Characteristics of Grid-Connected Three-Phase Z-Source Inverter in Photovoltaic Applications

 Thesis for the degree of Doctor of Science in Technology to be presented with due permission for public examination and criticism in Festia Building, Auditorium Pieni Sali 1, at Tampere University of Technology, on the 15th of April 2016, at 12 noon.

ABSTRACT

 Due to the inevitable depletion of fossil fuels and increased awareness of their harmful environmental effects, the world energy sector has been moving towards extensive use of renewable energy resources, such as solar energy. In solar photovoltaic power generation, the needed interface between the source of electrical energy, i.e., a photovoltaic generator, and electrical energy transmission and distribution systems is provided by power electronic converters known as inverters. One of the latest addition into the large group of inverter topologies is a Z-source inverter (ZSI), whose suitability for different applications have been extensively studied since its introduction in 2002. This thesis addresses the dynamic characteristics of a three-phase grid-connected Z-source inverter when applied to interfacing of photovoltaic generators. Photovoltaic generators have been shown to affect the behavior of the interfacing power converters but these issues have not been studied in detail thus far in case of ZSI.

In this thesis, a consistent method for modeling a three-phase grid-connected photovoltaic ZSI was developed by deriving an accurate small-signal model, which was verified by simulations and experimental measurements by means of a small-scale laboratory prototype inverter. According to the results presented in this thesis, the small-signal characteristics of a photovoltaic generator-fed and a conventional voltage-fed ZSI differs from each other.

The derived small-signal model was used to develop deterministic procedure to design the control system of the inverter. It is concluded that a feedback loop that adjusts the shootthrough duty cycle should be used to regulate the input voltage of the inverter. Under input voltage control, there is no tradeoff in between the parameters of the impedance network and impedance network capacitor voltage control bandwidth. Also the small mismatch in the impedance network parameters do not compromise the performance of the inverter. These phenomena will remain hidden if the effect of the photovoltaic generator is not taken into account. In addition, the dynamic properties of the ZSI-based PV inverter was compared to single and two-stage VSI-based inverters. It is shown that the output impedance of ZSI-based inverter is similar to VSI-based inverter if the input voltage control is designed according to method presented in the thesis. In addition, it is shown that the settling time of the system, which determines the maximum power point tracking performance, is similar to two-stage VSI-based inverter.

The control of the ZSI-based PV inverter is more complicated than the control of the VSIbased inverter. However, with the model presented in this thesis, it is possible to guarantee that the performance of the inverter resembles the behavior of the two-stage VSI, i.e. the use of ZSI in interfacing of photovoltaic generators is not limited by its dynamic properties.

THESIS LINK : https://trepo.tuni.fi/handle/10024/213108

Montagem e teste de bateria de íon-lítio

 

Modelado y simulación de sistemas de almacenamiento de energía fotovoltaica en Matlab-PARTE 2

 

Modelado y simulación de sistemas de almacenamiento de energía fotovoltaica en Matlab-PARTE 1

 

INDUÇÃO ELETROMAGNETICA

 

PROJETO DE CIRCUITO -CURSO ELETRONICA DE POTENCIA-PARTE1

 

Capacitores de segurança (tipo X, tipo Y), interferência de modo comum e interferência de modo diferencial.

 

Projeto moderno de fonte de alimentação comutada, fechando circuitos de feedback usando o Simplis

 

Experimento con circuito inversor SPWM monofásico (multiplicacion de frequencia)-PARTE2

 

Single-phase SPWM inverter circuit experiment (unipolar frequency multiplication, bipolar SPWM)-单相SPWM逆变电路实验(单极性倍频)实验前讲解-PART1

 ENGLISH LEGENDED VERSION

 ENGLISH SPEAKING VERSION

사고아크검출장치 신뢰성 평가 시스템 및 평가절차 개발 -Development of the Reliability Evaluation System and Procedures for the Arc-Fault Detection Device-이진식(Jinsik Lee) ; 김정기(Jeong-Gi Kim) ; 김재현(Jae-Hyun Kim) ; 전정채(Jeong Chay Jeon)

 

Development of the Reliability Evaluation System and Procedures for the Arc-Fault Detection Device 사고아크검출장치 신뢰성 평가 시스템 및 평가절차 개발 Jinsik Lee · Jeong-Gi Kim · Jae-Hyun Kim · Jeong Chay Jeon

Abstract 

Arc-fault Detection Devices (AFDDs) which cut off the electric power supply under the event of a fire are adopted in many countries to protect life and property from electric fires. However, a controversy over proper or unwanted trips persists for some adopters in the real fields. To alleviate the controversy, this paper describes the reliability evaluation system for AFDD which automates and extends the unwanted tripping test in IEC 62606. The developed reliability evaluation system considers various conditions on the power source quality, the physical state of wiring circuits, and running electrical appliances. System controller automatically switches and repeats numerous pre-designed testing conditions in order not to be constrained by time. Also, it measures the electrical and operating information to give objective evaluation results to stakeholders. Consequently, the proposed AFDD reliability evaluation can produce more detailed conditions which make AFDD to show unwanted trips and it might improve the reliability of AFDDs by upgrading their algorithm to detect electric arc.

ORIGINAL KOREAN VERSION:  http://journal.auric.kr/kiee/XmlViewer/f449656