“SE SEUS PROJETOS FOREM PARA UM ANO,SEMEIE O GRÂO.SE FOREM PARA DEZ ANOS,PLANTE UMA ÁRVORE.SE FOREM PARA CEM ANOS,EDUQUE O POVO.”

“Sixty years ago I knew everything; now I know nothing; education is a progressive discovery of our own ignorance. Will Durant”

OBRIGADO DEUS PELA VIDA,PROTEGENOS E GUARDANOS DE TODO MAL


AUTOR DO BLOG ENG. ARMANDO CAVERO MIRANDA SAO PAULO BRASIL

terça-feira, 31 de janeiro de 2017

Design of a IGBT Inverter for Large Capacity BLDC Servo Motor Driving by Hwang Minkyu Dept. of Electrical, Electronics and Control Eng. Graduate School of Engineering, Changwon National University





Design of a IGBT Inverter for Large Capacity BLDC Servo Motor Driving by Hwang Minkyu
Dept. of Electrical, Electronics and Control Eng. Graduate School of Engineering, Changwon national University (Advisor : Prof. Choi Jung Keyng, Ph.D)
ABSTRACT
 Inverter is the core module of the power electronics for converting a fixed DC voltage as a power conversion module with the AC voltage, It has been applied to a power control and motor control. In this study, we aimed to develop an inverter that is used especially for control of a kind of BLDC motor AC servo motor. The control of the inverter is composed of a circuit for generating a variable frequency, the motor phase voltages of variable amplitude, phase current using a DC voltage Vdc_link. Power switching device that is used for the built-in three-phase bridge circuit in the inverter unit is a high voltage, And For the purpose of the medium-current conduction IGBT devices it is mainly used. IGBT switching element is a tendency to use mainly the driving circuit module, because of the complexity of the gate drive circuit. In this study, we propose a method for designing an inverter of 40kW class using semikron 7 pack IGBT modules, three lower IGBT gate driving module and three upper IGBT gate driving module.

LINK
http://www.mediafire.com/file/2g1sc0hhnv3v0g5/Design_of_a_IGBT_Inverter_for_Large_Capacity_BLDC.pdf

quarta-feira, 25 de janeiro de 2017

MODELAGEM E ACIONAMENTO DE DIODOS ORGÂNICOS EMISSORES DE LUZ (OLEDS) PARA SISTEMAS DE ILUMINAÇÃO - TESE DOUTORADO - Vitor Cristiano Bender -Universidade Federal de Santa Maria - BRASIL






MODELAGEM E ACIONAMENTO DE DIODOS ORGÂNICOS EMISSORES DE LUZ (OLEDS) PARA SISTEMAS DE ILUMINAÇÃO 
 Autor principal: Vitor Cristiano Bender
Outros Autores: Rafael Adaime Pinto, José Marcos Alonso Álvarez, Henrique Antônio Carvalho Braga, Marco Antônio Dalla Costa, Ricardo Nederson do Prado, Tiago Bandeira Marchesan
Grau: Tese
Idioma: PORTUGUÊS.
Publicado em: Universidade Federal de Santa Maria 2015
 Resumo: A presente tese de doutorado apresenta o estudo e a caracterização de diodos orgânicos emissores de luz (OLEDs) com a proposta de um modelo equivalente que é útil no desenvolvimento de circuitos de acionamento e na análise de OLEDs, quando aplicados em sistemas de iluminação. Inicialmente, é apresentada uma revisão bibliográfica contemplando o princípio de funcionamento e os aspectos construtivos dos OLEDs. A partir disto, um modelo que integra os aspectos de escala, fotométricos, elétricos e térmicos é proposto. Esse modelo é denominado EFET e é dividido em estático e dinâmico. Uma proposta de procedimento para identificação dos parâmetros do modelo é apresentada, juntamente com a análise do efeito da capacitância intrínseca dos OLEDs no seu desempenho elétrico, térmico e fotométrico. Com o modelo proposto pode-se predizer e simular o comportamento dos OLEDs antes de construir o sistema de iluminação, reduzindo custos e tempo de desenvolvimento. O modelo é validado empregando diferentes amostras de OLEDs. Conclusões são obtidas a partir da validação experimental e de simulações empregando simuladores elétricos e da fluidodinâmica computacional através do método de elementos finitos. Uma abordagem considerando os métodos de ajuste da intensidade luminosa de OLEDs é apresentada, evidenciando o impacto cromático provocado por cada método. Por fim, um circuito de acionamento para OLEDs baseado no conceito de capacitores chaveados é proposto. Os resultados obtidos são satisfatórios e proporcionam um incremento ao estado da arte da modelagem e acionamento de OLEDs.
LINK ORIGINAL EN LA WEB
http://bdtd.ibict.br/vufind/Record/UFSM_d3fea1ec20b7614c5d70ce14b2af02bf/Description#tabnav

LINK DIRECTO
http://cascavel.ufsm.br/tede//tde_busca/arquivo.php?codArquivo=7622

Tecnologia desenvolvida na UNIVERSIDADE FEDERAL DE SANTA MARIA (UFSM-BRASIL) pode aumentar eficiência da iluminação pública em até 40%


Instituto Nacional de Propriedade Industrial (Inpi) concedeu prêmio Patente Verde para o protótipo de luminária com a invenção O programa de pós-graduação em Engenharia Elétrica da Universidade Federal de Santa Maria (UFSM) desenvolveu uma tecnologia que pode aumentar a eficiência da iluminação pública da cidade em até 40%.

E, após cinco anos de pesquisas, o protótipo recebeu a Patente Verde, distinção do Instituto Nacional de Propriedade Industrial (Inpi) que premia projetos com características sustentáveis. É a primeira dessas distinções recebidas pela UFSM.

O engenheiro eletricista Vitor Cristiano Bender foi o idealizador do projeto, que começou a ser construído em 2011: uma luminária feita de alumínio que melhora a eficiência energética por meio de um sistema de refrigeração. Na época, ele era estudante da pós-graduação da UFSM e tinha como orientador o coordenador da Agência de Inovação e Transferência de Tecnologia (Agittec), Tiago Bandeira Marchesan, que já trabalhava na linha de iluminação.

 Bender explica que optou por diodos emissores de luz (LED, na sigla em inglês) por serem naturalmente eficientes. Ao estudar técnicas de gerenciamento térmico, encontrou a solução para um problema recorrente em suportes de iluminação pública: após algum tempo ligado, o LED começa a produzir menos luz. E isso teria relação com o aumento da temperatura, razão pela qual instalou um dissipador de calor dentro da luminária. DDD– Com a ventilação forçada, percebe-se até 46% de redução na temperatura. Assim, operam em uma temperatura adequada e emitem seu máximo de luz – diz Bender.

  O professor Marchesan explica o sistema fazendo uma comparação com um computador. Quando o equipamento esquenta, funciona de maneira menos eficiente e precisa consumir mais energia para continuar funcionando. Com a ventilação forçada, ele opera sempre dentro da condição ideal. – São três pontos positivos: economia de energia, melhor iluminação e longa vida útil. Tudo isso reduz custos – afirma Marchesan. O Inpi enalteceu as aplicabilidades, principalmente na iluminação de vias públicas, estacionamentos, ambientes que exijam grande luminosidade e locais de difícil acesso e manutenção.

 A UFSM investiu R$ 20 mil no protótipo, além do valor pago em forma de bolsas para os estudantes envolvidos no projeto. Ainda não há estimativa de qual seria o investimento necessário para substituir os 20 mil pontos de luz da cidade por essa tecnologia, porque seria necessário consultar a empresa responsável pela produção. Marchesan garante, no entanto, que a médio e longo prazos, o modelo seria mais barato, e a cidade ficaria melhor iluminada. O secretário de Desenvolvimento Econômico, Turismo e Inovação, Ewerton Falk, diz que o Executivo tem se aproximado das instituições de ensino e incubadoras tecnológicas para se colocar à disposição de quem tiver interesse em apresentar projetos. – As portas estão abertas. Estamos atrás de alternativas econômicas e percebemos disposição para o trabalho por parte das instituições aqui de Santa Maria, muitas delas na UFSM. Mas precisamos compreender os projetos para avaliar o investimento e o retorno – diz. O coordenador da Agittec relata que foi feita proposta à gestão anterior do Executivo para fazer a aferição das lâmpadas instaladas nas ruas da cidade. De graça. Além disso, segundo Marchesan, a agência universitária avaliaria sua estrutura, de forma a torná-la mais eficiente, trazendo economia e melhor resultado. A conversa não progrediu, mas a oferta está em pé. – Na Avenida Fernando Ferrari, por exemplo, apesar de haver postes ao longo de toda a via, há pontos escuros. Isso poderia ser consertado fazendo algumas readequações. Há situações parecidas em outras vias da cidade – conta Marchesan.
 FONTE ORIGINAL DA NOTICIA
http://diariodesantamaria.clicrbs.com.br/rs/geral-policia/noticia/2017/01/tecnologia-desenvolvida-na-ufsm-pode-aumentar-eficiencia-da-iluminacao-publica-em-ate-40-9565141.html

terça-feira, 24 de janeiro de 2017

PARTICIPAÇÃO DA KOLFF BRASIL NO SEMINARIO DE TERMOGRAFIA FLUKE- SÃO PAULO BRASIL





A KOLFF DO BRASIL  REPRESENTADA PELO ENG. ARMANDO CAVERO MIRANDA ESTEVE PRESENTE NO SEMINÁRIO DE TERMOGRAFIA MINISTRADA PELA EMPRESA LIDER EM INSTRUMENTOS DE MEDIÇÃO FLUKE DO BRASIL 
PALESTRANTE ENGENHEIRO Caio Tappiz
Product Maganer / Field Application Engineer na Fluke Corporation

domingo, 22 de janeiro de 2017

Design, Hardware implementation and Control of a 3-phase, 3-level Unity Power Factor Rectifier - Master of Engineering in Electrical Engineering By Krishna Kumar M J - Department of Electrical Engineering Indian Institute of Science Bangalore - India



Abstract
 Usage of conventional bridge type rectifiers for obtaining DC power from AC grid results in injection of unwanted current harmonics into the grid. Due to standards such as IEEE 519-1992 [1] which limit the amount of harmonic injection into the mains, the bridge type rectifiers are being replaced by improved power quality converters which have reduced harmonic injection into the mains along with a host of other advantages. This project deals with the hardware development and control of a 3-phase, 3-level UPF rectifier which is a variant of an improved power quality converter named vienna rectifier [2]. The 3-phase, 3-level rectifier is characterised by its input currents being almost sinusoidal, reduced input current ripple, controllable output DC voltage, high power density and UPF operation. Further, reduced losses and a lesser component count of the 3-phase, 3-level rectifier compared to the vienna rectifier indicate a greater scope for reduction in the size of the rectifier along with reduced packaging effort. In this work, the necessary hardware for the 3-phase, 3-level UPF rectifier has been developed, assembled and tested for a power level of 2kW and a DC bus voltage of 750V. A carrier based control strategy has been proposed for the control of the rectifier and its operation is validated on the hardware setup. Based on the results obtained from simulation and hardware implementation, a comparison has been done between the already existing hysteresis based control strategy [2] and the proposed carrier based control strategy. Overall, the project work involves the building of the 3-phase, 3-level UPF rectifier setup, design of the controller parameters, validation of the proposed carrier based control strategy both in simulation/hardware and comparison of the proposed control strategy with an originally existing hysteresis based control strategy.

LINK ORIGINAL COMPLETE THESIS
http://www.ee.iisc.ac.in/new/people/faculty/vjohn/pdf/ME2012_KrishnaKumarMJ.pdf

A study on Development of an algorithm for reducing neutral current in three-phase four-wire PWM rectifier of UPS Kim,Seung Ho (SupervisorSong,JoongHo) Dept.of Electrical Engineering Graduate School of Industry and Engineering Seoul National University of Science and Technology-SOUTH KOREA











ABSTRACT
Recently, the power quality sensitive loads such as computer and communications are so increased that the power supply with good power quality has come to the fore.However,it is possible that the public grid is interrupted by unexpected fault.Therefore,the UPS(uninterruptible power supply)has be come an alternative solution to solve this problem.Generally, the UPS consist of a rectifier,a battery,and a PWM inverter and recently they use IGBT PWM rectifier to reduce input THDi and improve the input power factor.

In this configurations the three-phase four-wire inputUPS is widely used to eliminate the transformers in the UPS system.The aims of control algorithm for the IGBT PWM rectifierin three-phase four-wire UPS is a unity power factor.The SVM(space vector modulation)is one of the most popular and preferable PWM scheme because it reduces the commutation losses and harmonics in the output voltage,and has higher modulation index than SPWM(sinusoidal PWM)but they need a 3D SVM to control three-phase four-wire PWM rectifier and have some difficulties like as selection of inductance of input inductor and controls the neutral current.

To improve this problem the another control algorithm which controls each phase individually has been suggested but this control algorithm use analog based control is sensitive and unstable.So another new algorithm which is added d-q control to control algorithm which controls each phase individually is suggested and it can control stably and can reduce neutral current too.This can be seen by computer simulation and experimental result.

sexta-feira, 20 de janeiro de 2017

ADVANCED INVERTER CONTROL FOR UNINTERRUPTIBLE POWER SUPPLIES AND GRID-CONNECTED RENEWABLE ENERGY APPLICATIONS By Shuai Jiang Michigan State University - Electrical Engineering – Doctor of Philosophy


ABSTRACT 
ADVANCED INVERTER CONTROL FOR UNINTERRUPTIBLE POWER SUPPLIES AND GRID-CONNECTED RENEWABLE ENERGY APPLICATIONS
By Shuai Jiang
A DISSERTATION Submitted to Michigan State University in partial fulfillment of the requirements for the degree of Electrical Engineering – Doctor of Philosophy

The advancement of digital signal processors (DSPs) and programmable logic devices in modern power electronics systems offer great control flexibility and capability, providing attractive features particularly for applications in which complex control tasks are involved. This dissertation investigates some DSP based advanced control algorithms for pulse-width modulation (PWM) inverter applications, in particular, voltage regulated inverters connected with AC loads and current regulated inverters connected with utility grids. Uninterruptible power supply (UPS) is a typical example of voltage regulated inverter applications. It is widely used to supply high quality, continuous and disturbance-free AC power to critical loads such as medical equipments, computers and communication systems. A good UPS system requires not only excellent steady state performances in terms of voltage regulation and total harmonic distortions (THD) regardless of unknown load disturbances but also a fast transient response during load step change. In this dissertation, a three-phase four-wire AC-DC-AC double conversion UPS system is first studied. Multi-loop control strategies are designed to regulate the system input currents, DC voltages, and output voltages. Next, study will deep dive into a DC-AC three-phase UPS inverter. A high performance repetitive controller (RC) for the voltage regulated three-phase inverter is proposed. The proposed control algorithm can eliminate all the periodic distortions and guarantees a high quality sinusoidal output voltage under unknown and severely distorted loads. A novel 4th-order linear phase infinite-impulse-response (IIR) filter is first used in the RC such that harmonic distortions up to the 19th order are rejected. In order to achieve fast response during step load transient while still maintaining the low THD feature, a modified synchronousframe approach with significantly reduced delay is later proposed and investigated. Grid-connected inverters utilizing renewable energy sources (e.g., photovoltaic, wind, fuel cell, etc.) are growing rapidly in recent years along with the constantly growing global demand for electricity. A grid-connected inverter injects a synchronously regulated sinusoidal current to the utility grid with required low THD and high power factor. Using an LCL filter in such a system has been recognized as a small size low cost solution due to its -60dB/dec high frequency attenuation. In this dissertation, a high-resonance-frequency LCL filter with minimal size and cost requirement is designed. A proportional plus repetitive control hybrid strategy is then proposed to achieve very low THD current regulation and high power factor. Although utility grid is often modeled as an infinite AC voltage source in inverter current control, it can introduce way more complicated resonance issues particularly when long transmission cables are used between the inverter and the main grid. A real example of an HVAC offshore wind farm system with long submarine cables is then investigated and emulated by a scaled-down 120Vac single-phase system. A systematic analysis is carried out and the key passive component parameters that cause high frequency resonances are identified. A notch filter based active damping control is proposed and implemented in the inverter. When a grid-connected inverter is sourced from photovoltaic (PV) panels, a front-end isolated DC-DC converter is usually incorporated and dedicated control must be employed based on the converter dynamics to achieve both maximum power point tracking (MPPT) and coordination with the 2nd-stage inverter control. A high performance system-level control scheme is designed for the proposed boost-half-bridge converter-inverter system in the PV application.

LINK COMPLETE THESIS
https://etd.lib.msu.edu/islandora/object/etd%3A2193
DIRECT LINK
https://etd.lib.msu.edu/islandora/object/etd%3A2193/datastream/OBJ/download/Advanced_inverter_control_for_uninterruptible_power_supplies_and_grid-connected_renewable_energy_applications.pdf

quarta-feira, 4 de janeiro de 2017

KOLFF en Expo Automatización 2016



 Recientemente KOLFF participó en la 8ª Edición de la Expo Automatización realizada este año en la Sede San Joaquín de Duoc UC. En esta cita, llevada a cabo por la Asociación de la Industria Eléctrica, se contó con la presencia de destacados relatores del mundo tecnológico quienes entregaron sus conocimientos en variadas intervenciones enfocadas a la automatización en Chile. Entre los temas tratados se encontraron la eficiencia energética, las comunicaciones industriales y la robótica.
 El stand de KOLFF destacó la relevancia de los equipos de respaldo eléctrico existentes en las empresas, y su eficiencia en la automatización de los sistemas de activación tras un corte del suministro energético.

LINK ORIGINAL EN LA WEB

terça-feira, 3 de janeiro de 2017

Design of a Power Converter for a Non-starting Air Conditioner Compressor in Commercial Vehicles - 상용차의 무시동시 에어컨 압축기용 전력변환기 설계 - Keun-Woo Han Department of Electrical Engineering Graduate, School Chonnam National University - SOUTH KOREA








Design of a Power Converter for a Non-starting Air Conditioner Compressor in Commercial Vehicles 상용차의 무시동시 에어컨 압축기용 전력변환기 설계 

 Keun-Woo Han  
Department of Electrical Engineering Graduate, School Chonnam National University 

 (Abstract) 
Recently, the direction of automotive technology development is concentrated on the reduction of the greenhouse gases accelerating global warming, as well as fuel efficiency improvement against rising oil prices. In particular, as a means of transportation with high transport efficiency compared to its vehicle market share, commercial vehicles are playing a key role in the national logistics industry. In addition, they also play an important role in all transportation sectors, supporting social overhead capital including urban construction, roads, bridges, harbors, etc. Consequently, their annual average mileage is 3.4 times that of passenger cars, with significant oil consumption or CO2 emission, which increases the need to develop eco-friendly technologies and increase energy efficiency. Commercial vehicles, which were recognized as a simple means of transportation in the past, have also become widely recognized as a second living space with the addition of space for the driver to sleep . Accordingly, existing commercial vehicle development is experiencing a change of direction from performance to the direction in which importance is placed on safety, comfort and convenience. The air conditioning system of a vehicle is a core component that maintains its interior temperature at a comfortable level according to the preference of passengers, and is of great significance in the aspect of increased comfort. In general, vehicle air conditioning systems refer to a unit that maintains a vehicle’s room temperature as desired by its driver using the energy generated by engine operation (driving or idling). Since the operation of such air conditioning systems utilize part of the engine’s driving force, it has s significant relation to the vehicle’s fuel efficiency. In particular, in the case of commercial vehicles, the utilization rate of an air conditioning system depends greatly on the driving habits of a driver when waiting for work during the summer season or when a driver frequently sleeps in the vehicle at night. Consequently, commercial vehicles which use air conditioners frequently and for long periods during the summer season need to have their large engines operating frequently, thereby causing environmental pollution due to excessive fuel consumption and exhaust gas. In addition, it is required that new vehicles must meet the Euro III Emission regulation and be equipped with a control system that automatically stops the engine when the vehicle remains idling for more than 5 minutes. Therefore, the problem regarding air conditioning (cooling) of commercial vehicles, including cargo vehicles and express buses, must be solved. This paper proposes a power converter for a non-starting air conditioner compressor for commercial vehicles in order to solve the problem of air conditioning (cooling) of a commercial vehicle when it remains stopped. The proposed system consists of a DC/DC converter and a 3 phase DC/AC inverter. In order for the air conditioning system to be operative in the non-starting state of the vehicle, an electrically driven compressor and 3 phase inverter operated at 200V and higher are required. However, in the case of a commercial vehicle, it is composed of a 24V battery-based DC system only. Therefore, in order to supply a non-starting air conditioner compressor system, a converter that can increase the voltage of the 24V battery by more than 10 times is indispensible. In the case of a converter for a non-starting air conditioner system, it requires high efficiency and high power density along with low voltage (24V) and high current characteristics. Therefore, a resonant type converter with an advantage of reduced loss due to high frequency switching is suitable for a power converter. In order to meet such conditions, this paper configured a L-C resonant type DC/DC converter with a half-bridge structure, consisting of a voltage doubler circuit and high frequency transformer. For the configured converter, the transformer leakage inductance and capacitor of the voltage doubler circuit are used for resonance without using an additional resonant tank. This enabled zero current switching (ZCS) to be available and also allows the converter to be designed in such a way that the switching loss at the primary side of the DC/DC converter transformer through which a current higher than 100A flows. In addition, the entire size and cost of the system were reduced by replacing the inductance component necessary for the resonant circuit with the transformer leakage inductance. As a result, unlike vehicles to which an existing mechanical compressor is applied, it can be seen that fuel consumption and exhaust gas emissions were reduced because no fuel was consumed separately during non-starting period. It is expected that the proposed power converter will ensure high efficiency under 24V low power supply conditions and be suitable for the power converter for similar air conditioner compressors for which a low withstanding voltage inverter module can be used.

domingo, 1 de janeiro de 2017

Control de filtros activos de potencia para la mitigación de armónicos y mejora del factor de potencia en sistemas desequilibrados-Author(s): Petit Suárez, Johann Farith- Universidad Carlos III de Madrid. Departamento de Ingeniería Eléctrica




Abstract: La utilización, cada día mayor, de dispositivos electrónicos en sectores residenciales, comerciales e industriales ha traído consigo un aumento significativo de las perturbaciones que afectan la calidad de la forma onda (distorsión armónica) y por ende a la degradación de ésta. El origen del problema en este caso está en la demanda de corrientes altamente distorsionadas que al propagarse por la red provocan caídas de tensión con un alto grado de distorsión armónica, aumento de pérdidas en las líneas eléctricas, malfuncionamiento de equipos, etc. Las soluciones existentes tratan de evitar que estas corrientes se propaguen por la red o en su defecto limitar la emisión de perturba¬ciones de forma que no afecte a la inmunidad electromagnética de los equipos o instalaciones conectadas a la red eléctrica. En esta tesis doctoral se presentan las bases conceptuales para implementar un filtro activo de potencia de conexión en paralelo (FAPP) para compensar esta perturbación y se propone un nuevo algoritmo para la generación de la corriente de referencia que busca extender el espectro de aplicación de estos filtros bajo tensiones de suministro desequilibradas y/o distorsionadas. Adicionalmente, se ha diseñado y construido un prototipo de FAPP que permite entre otras cosas el poder implementar los distintos algoritmos presentados en la literatura y verificar las capacidades que tiene este dispositivo para compensar perturbaciones de corriente en tiempo real
ABSTRACT
The wide application of the non-linear loads and electronics equipment such as adjustable speed drives, compact fluorescent lamps and personal computers in residential, commercial and industrial buildings, is directly responsible for the marked increase in the level of harmonic distortion observed in today's electrical power networks, producing an important and undesirable harmonic pollution problem. To mitigate the adverse impact of harmonic currents in electrical systems, compensators for such non-linear loads are needed and the active power filters appear like the dynamic solution that best fits the compensation necessities. In this PhD Thesis, the conceptual bases for a shunt active power filter (SAPF) implementation are presented and a new current reference algorithm for the SAPF control is proposed. The algorithm calculates the current reference to compénsate harmonics in the load current, load unbalances and the power factor under unbalanced and distorted voltages. Finally, the feasibility of the hardware implementation for the proposed current reference algorithm and other controls is evaluated in an experimental setup.

 LINK ORIGINAL WEB
http://e-archivo.uc3m.es/handle/10016/2384#preview
LINK DIRECTO
http://hdl.handle.net/10016/2384

CONSIDERACIONES ACERCA DE LA UTILIZACIÓN DE ARROLLAMIENTOS DE ESTABILIZACIÓN EN TRANSFORMADORES ESTRELLA-ESTRELLA Autor: Ángel Ramos Gómez -TESIS DOCTORAL -DEPARTAMENTO DE INGENIERÍA ELÉCTRICA-UNIVERSIDAD CARLOS III DE MADRID

CONSIDERACIONES ACERCA DE LA UTILIZACIÓN DE ARROLLAMIENTOS DE ESTABILIZACIÓN EN TRANSFORMADORES ESTRELLA-ESTRELLA
Autor: Ángel Ramos Gómez
TESIS DOCTORAL -DEPARTAMENTO DE INGENIERÍA ELÉCTRICA
UNIVERSIDAD CARLOS III DE MADRID

LINK ORIGINAL EN LA WEB
http://e-archivo.uc3m.es/handle/10016/22747
LINK DIRECTO
http://e-archivo.uc3m.es/bitstream/handle/10016/22747/tesis_angel_ramos_gomez_2016.pdf?sequence=1&isAllowed=y