CONCEPCIÓN E INTEGRACIÓN EN MICRORREDES RESIDENCIALES DE INVERSORES MULTINIVEL SIN TRANSFORMADOR DE AISLAMIENTO CON EXTRACCIÓN SIMULTÁNEA DE LA MÁXIMA POTENCIA DE MÚLTIPLES GENERADORES FOTOVOLTAICOS Patrao Herrero, Iván Materia Ingeniería Electrónica y Comunicaciones-UNIVERSIDAD POLITECNICA DE VALENCIA

 CONCEPCIÓN E INTEGRACIÓN EN MICRORREDES RESIDENCIALES DE INVERSORES MULTINIVEL SIN TRANSFORMADOR DE AISLAMIENTO CON EXTRACCIÓN SIMULTÁNEA DE LA MÁXIMA POTENCIA DE MÚLTIPLES GENERADORES FOTOVOLTAICOS POR Patrao Herrero, Iván -Materia Ingeniería Electrónica y Comunicaciones 

TESIS DOCTORAL-UNIVERSIDAD POLITECNICA DE VALENCIA-UPV 

Resumen

 Los inversores multinivel se utilizan de forma habitual en aplicaciones de gran potencia, pero la aplicación de las topologías multinivel en la generación fotovoltaica de pequeña potencia presenta algunas ventajas de interés. Se propone una topología de inversor fotovoltaico monofásico de inyección a red sin transformador, basada en las topologías multinivel, llamada NPC+GCC. Esta topología presenta características de gran interés para su uso como inversor sin transformador directamente conectado a la red eléctrica. Se estudia su tensión de modo común, y cómo esta genera una corriente de derivación capacitiva que se mantiene muy por debajo de los límites permitidos por la normativa. La topología NPC+GCC permite la conexión de dos generadores fotovoltaicos en su entrada, sobre los que efectuará una búsqueda del punto de máxima potencia de manera totalmente independiente y con un elevado rendimiento y fiabilidad, ya que no utiliza convertidores conectados en cascada para realizar esta función.

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3-phase Dynamic Voltage Restorer with Switching Cell Structured Direct AC-AC Converter Using Interphase Voltage* Hyeongmin Lee School of Electronic and Electrical Engineering Graduate School, Kyungpook National University Daegu, Korea (Supervised by Professor Heung-Geun Kim)

 

3-phase Dynamic Voltage Restorer with Switching Cell Structured Direct AC-AC Converter Using Interphase Voltage* Hyeongmin Lee School of Electronic and Electrical Engineering Graduate School, Kyungpook National University Daegu, Korea (Supervised by Professor Heung-Geun Kim) 

 (Abstract) Instantaneous voltage sag account for the largest proportion of various grid accidents, and the economic losses resulting from them are enormous. To solve this problem, various dynamic voltage restorer(DVR) systems are being researched and developed. Most of these are back-to-back(BTB) types and energy storage(ES) types. Since the BTB type uses the distribution voltage as a voltage source, it can be compensated continuously without a separate storage device, but energy conversion loss occurs because energy conversion must be performed in two or more stages. Also, in order to secure the DC-link voltage, the controller must be complicatedly configured. The ES type utilizes an extra energy storage device and uses it as a voltage source. This results in energy conversion in one stage, resulting in small conversion losses. However, since the unit cost of the energy storage device is high, there is a disadvantage that a lot of cost is incurred to construct the system. Also, due to the capacity limitations of energy storage devices, the compensation time is limited. If additional storage devices are configured to extend the compensation time, the cost will be higher, and this will determine the performance of the system. In this paper, a DVR system consisting of a direct AC-AC converter with a switching cell structure and using an interphase voltage source is presented. The switching cell structure overcomes the current commutation problem, which is a disadvantage of the conventional AC switch, and can prevent damage to the switch due to the short circuit and open of the conventional switch leg. In addition, it can be operated with a high switching frequency because it can be configured as a diode with a fast reverse recovery time instead of a body diode with poor performance. This can reduce the volume and unit cost of passive filters, which are costly in the system configuration. And by using the interphase voltage as a voltage source, it overcomes the disadvantage that the compensation range of the DVR using an ac-ac converter is limited to 50%. This can also compensate for phase jump situations. Compared with the BTB type, the efficiency is good due to energy conversion in one stage, and the time to secure the DC-link voltage is not required, so the dynamic characteristics are better. In addition, control is simple because it is driven through DC reference. Compared with the ES type, there is no limit to the storage device, so the compensation duration is long and the system configuration is economical. Above all, unlike the two conventional compensators that use a voltage source inverter(VSI), the system reliability is excellent and there is no need to apply a bulky and lossy filter. Finally, to prove the feasibility of this paper, we performed a simulation and directly configured the hardware to prove that it is compensable under various voltage sag situations.

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ORIGINAL SOURCE:

http://www.riss.kr/search/detail/DetailView.do?p_mat_type=be54d9b8bc7cdb09&control_no=83dd26b69bdf21a3ffe0bdc3ef48d419&keyword=converter%20%20ac%20ac

ENG. ILDO BET (CEO DA PHB) A HISTORIA DA PRIMEIRA EMPRESA DO BRASIL QUE DESENVOLVIO E INDUSTRIALIZOU AS FONTES CHAVEADAS DE PC E INICIO OS INVERSORES FOTOVOLTAICOS NO BRASIL

Conheça a história de Ildo Bet, um pioneiro no segmento de energia que é um símbolo da inovação tecnológica no país ENGENHEIRO desenvolvedor da fonte de alimentação do microcomputador: Ildo Bet, engenheiro eletrônico, professor universitario e CEO da PHB Solar, a empresa produtora das fontes das urnas eletrônicas do país. Desde 1984, ano de fundação da PHB, uma busca por inovação e qualidade, com seriedade e desenvolvimento tecnológico brasileiro, foram fatores notáveis ​​e importantes na trajetória da PHB Solar. Desta maneira, foi o primeiro fabricante de inversores solares a ser certificada pelo INMETRO no Brasil, atuando na coordenação e elaboração de normas reguladoras e criando forma singular, um laboratório completo para testes e manutenção dos seus próprios produtos. Sempre à frente, a PHB Solar é uma indústria 100% nacional com pioneirismo e competência tecnológica, desenvolvendo soluções para a Geração Distribuída como um todo. A engenharia da PHB oferece respostas rápidas e não depende de uma consulta internacional, sendo uma empresa precursora no mercado de energia solar. 

 O ENGENHEIRO ILDO BET SEMPRE APOIO A PARCERIA ENTRE INDUSTRIA E UNIVERSIDADE,APOIANDO COMO PATROCINADOR OS SEMINARIOS,CONGRESSOS DE ELETRÔNICA DE POTÊNCIA NO BRASIL,E UMA LENDA VIVA DA ELETRÕNICA E INDUSTRIA E UM EXEMPLO DO CAMINHO QUE TEM QUE CONTINUAR BRASIL FAZENDO REATIVAR SUA INDUSTRIA NACIONAL NÃO DEPENDER UNICAMENTE DA CHINA.

FONTE  ORIGINAL DA INFORMAÇÃO:

Edmond Tech Elementar para o seu negócio Financial Services Barueri, São Paulo

PARTICIPAÇÃO WEBINAR "Sistema Elétrico de Potência: Mudanças, desafios e oportunidades"Capítulo Estudantil PELS/IAS do Ramo IEEE UFRN-BRASIL

PARTICIPAÇÃO NO WEBINAR "Sistema Elétrico de Potência: Mudanças, desafios e oportunidades". O webinar contó com uma palestra ministrada pelo Professor Dr. Thiago Rocha da UFRN, além de uma mesa redonda composta pelo Engenheiro Igor Chianca, o Pesquisador Thales Queiroz e pela Engenheira Victória Botelho.Capítulo Estudantil PELS/IAS do Ramo IEEE UFRN BRASIL

Short Circuit Requirements of Power Converters based upon Wide-Bandgap -Author Pappis, DouglasThis work has been accepted by the Faculty of Electrical Engineering / Computer Science of the University of Kassel as a thesis for acquiring the academic degree of Doktor der Ingenieurwissenschaften (Dr.-Ing.).

 

ABSTRACT

In power electronics designs, the evaluation and prediction of potential fault conditions on semiconductors is essential for achieving safe operation and reliability, being short circuit (SC) one of the most probable and destructive among the failures. It can occur externally to the power converter by shortening the load, or internally due to failures on galvanic isolations, stress on passive components, or even in the power semiconductors themselves. Silicon (Si) based power semiconductors have been extensively investigated with regards to their SC capability, although there is still on-going research as their design is being pushed closer to theoretical limits. Recent improvements on Wide-Bandgap (WBG) semiconductors such as Silicon Carbide (SiC) and Gallium nitrite (GaN) enable power electronic designs with outstanding performance, reshaping the power electronics landscape. In comparison to Si, SiC and GaN power semiconductors physically present smaller chip areas, higher maximum internal electric fields, and higher current densities. Such characteristics yield a much faster rise of the devices internal temperatures, worsening their SC performance if compared to Si.

LINK: https://kobra.uni-kassel.de/bitstream/handle/123456789/13296/orig_9783737609777.pdf?sequence=2&isAllowed=y