TESTE PLACA CARREGADOR DE BATERIAS UPS ONLINE 2KVA -6 BATERIAS DE 12VDC

 

THE IGBT TEST SETUP DESIGN Master Thesis By Kun Liu Abdirahman Hirsi-Division of Electric Power Engineering Department of Energy and Environment CHALMERS UNIVERSITY OF TECHNOLOGY

 

THE IGBT TEST SETUP DESIGN Master Thesis By Kun Liu Abdirahman Hirsi-Division of Electric Power Engineering Department of Energy and Environment CHALMERS UNIVERSITY OF TECHNOLOGY-Gothenburg, Sweden 2008 

Abstract 

An experimental half bridge converter setup is designed in order to explore the switching characteristics and losses of a new type of IGBT module. A specific digital control circuit and a drive circuit for an IGBT are designed and integrated into one PCB which can provide different kinds of precise IGBT gate signals. The switching characteristics and losses are investigated under different parameters both in a hardware and a simulation. It can be observed that the switching losses are increasing with the increase of voltage and current levels. Increasing the gate resistance also tends to increase the IGBT switching losses, while the reverse recovery losses of the free-wheeling diode decrease. The switching characteristics of the IGBT are not affected by temperature, but the reverse recovery losses increase with the temperature. The stray inductance has a negative effect, since it causes the oscillation both in the voltage and current waveforms.

 LINK1 : https://www.mediafire.com/file/dpy9vooyx34f23h/IGBT-THESIS.pdf/file

LINK2: https://mega.nz/file/BMFXHRKJ#7gVHFUzX568UFvwuPZWM4YL5t0X-JcTThyXNjN7WBcE 

동북아 슈퍼그리드의 HVDC 계통 및 고장 해석 연구- A study on the HVDC system and fault analysis of the Northeast Asian Supergrid-BY MOON BYUNG-SOO - Department of Electrical Engineering Graduate School of Chosun University

 

 ABSTRACT 

A Study on the HVDC System and Fault Analysis of the Northeast Asian Supergrid MOON BYUNG-SOO Advisor: Prof. Choi Hyo-Sang Ph.D. Department of Electrical Engineering Graduate School of Chosun University

 The thesis's topic is “A study on the HVDC system and fault analysis of the Northeast Asian Supergrid.”In the 21st century, as energy conversion accelerates due to global warming and fossil fuel depletion, the establishment of a supergrid linking power grids among countries is emerging as a major concern. Northeast Asia is rich in renewable energy resources such as wind and solar power in Mongolia and the interior of China, and is geographically adjacent to large-scale power demands in Korea, Japan, and China, providing favorable conditions for cross-border power supply and demand balancing. As a result, strategies for securing energy security and realizing carbon neutrality by 2050 are being developed, and to achieve these goals, it is necessary to establish measures to address the issues of frequency differences among AC systems when linking power grids among countries and the increase in fault current that occurs when connecting to high-voltage direct-current (HVDC) systems. In this paper, the characteristics of fault currents generated in the HVDC transmission system were analyzed, and the applicability of reduction technology was reviewed. In chapter 2, sections 1 and 2, the technical trends of the HVDC transmission system, the transmission methods and interconnection schemes, and the basic principles and modulation techniques of the VSC-HVDC system were examined to present the system configuration direction suitable for HVDC connection. Section 3 systematically summarized the principle of superconducting fault current limiters (SFCLs), DC interruption theory, types of DC interruption technologies, and the operating principles of DC circuit breakers (DCCBs). Section 4 describes the fault analysis theory for the high voltage alternating current (HVAC) system and the specification of fault current calculation based on the IEC 60909. In addition, the basic theories of unbalanced faults such as single-line-to-ground, double-line-to-ground, line-to-line, and three-phase faults, and protection relay were described. In chapter 3, PSCAD/EMTDC simulation design and interpretation were conducted. In section 1, simulation parameters for the application of the symmetric coordinate method were set up. Using this parameter, a symmetric component (P–N–Z) analysis based on the x-axis was performed on the three-phase asymmetric failure types of one-line ground fault, two-line ground fault, and line-to-line short circuit. Using this, electrical characteristics such as instantaneous values of voltage and current for each failure type, unbalance, and change in symmetric components were analyzed. In section 2, an VSC-HVDC grid based on the modular multi level converter (MMC) was constructed between Weihai, China and Taean, Korea, and its parameters were defined. In section 3, the DC voltage, current, and power graphs of MMC were analyzed by steady-state simulation, and the voltage, current, and power characteristics of AC1 (Weihai, China) and AC2 (Taean, Korea) were analyzed. In section 4, a transient state simulation was executed in a PSCAD/EMTDC environment, and the characteristics of the VSC-HVDC system based on a MMC. Also the DC transmission system, and the AC1 and AC2 systems were analyzed. By setting four fault points (F1-F4) in the HVDC ±500 kV, 350 km transmission section, the DC ground current generated during the one-line ground failure of the P (+) and N (-) poles, and the AC voltage, current, and power characteristics of the sending point and the receiving point were analyzed. In addition, the voltage, current, and power characteristics of the AC1, AC2, and DC systems were analyzed in the event of a one-line ground fault, two-line ground fault, between lines, and three-phase short circuits of the AC1 and AC2 systems.

FULL THESIS:https://www.riss.kr/search/detail/DetailView.do?p_mat_type=be54d9b8bc7cdb09&control_no=58a12d105532aee7ffe0bdc3ef48d419&keyword=HVDC 

Research on Control Strategy of High-power Three-phase Combined Inverter = 고전력 삼상 복합 인버터 제어 전략 연구 -BY ZHANG HUAYING-Department of Electrical Engineering Graduate School of Konkuk University

Research on Control Strategy of High-power Three-phase Combined Inverter = 고전력 삼상 복합 인버터 제어 전략 연구 -BY ZHANG HUAYING-Department of Electrical Engineering Graduate School of Konkuk University 

ABSTRACT Research on Control Strategy of High-power Three-phase Combined Inverter Zhang Hua Ying Department of Electrical engineering Graduate School of Konkuk University 

Three-phase voltage-type inverters are used in various occasions, such as static reactive power compensator, uninterruptible power supply distribution network development system, motor control, etc. In today's world where energy is scarce, research on inverters and their control technology is of great significance and is gaining more and more attention. People have higher and higher requirements for inverter power supplies. High-performance, high-reliability high-power inverters are one of the development trends of inverter power supplies. In the high-power inverter power supply, the current on the main circuit power device is relatively large, which can reach hundreds of amps, or even thousands of amps. There are two main ways to increase the capacity of the inverter power supply. And parallel technology using inverters to achieve power modularity. This article takes 30kVA combined three-phase inverter as the research object, adopts PID control method, mainly studies the waveform control of high-power three-phase inverter, and focuses on the main circuit structure and system of high-power three-phase inverter. The mathematical model and waveform control were analyzed and studied in detail. The structure of the three-phase combined inverter suitable for high power is analyzed, the main circuit design of the combined threephase inverter with 30KVA is given, and the combined three-phase inverter established and analyzed under different coordinate systems The mathematical model of the model is simulated and studied according to vi the parameter settings.

ORIGINAL LINK :https://www.riss.kr/search/detail/DetailView.do?p_mat_type=be54d9b8bc7cdb09&control_no=ef54d3a0876fa98cffe0bdc3ef48d419&keyword=INVERTER 

65 anos de UFSM: entrevista com o reitor Luciano Schuch-Reitor entre 2022 e 2025, Schuch destacou-se por investimentos na inovação, qualidade de trabalho na universidade e incentivo no aumento de índices

 

Em celebração aos 65 anos da Universidade Federal de Santa Maria (UFSM), comemorados em 14 de dezembro de 2025, a Agência de Notícias e a TV Campus, vinculadas à Coordenadoria de Comunicação Social, lançaram a série “Direto do Gabinete”, um conjunto de entrevistas com as ex-reitorias da instituição. Publicadas em formato multimídia, as produções buscam valorizar a memória da Universidade e salientar os principais avanços na trajetória de cada gestão. O sétimo entrevistado da série é o professor Luciano Schuch, décimo segundo reitor da UFSM, entre 2022 e 2025. Formado em Engenharia Elétrica pela Instituição, Schuch foi vice-reitor na gestão de Paulo Burmann, entre 2018 e 2021. Sua gestão buscou fortalecer o ecossistema de inovação da UFSM, implementou o Programa de Gestão e Desempenho (PGD) e incentivou o aumento dos índices de qualidade dos cursos.

 ORIGINAL LINK:https://www.ufsm.br/2025/12/22/65-anos-schuch