Lec08 電子學(一) 第二章 Operational Amplifiers-Prof.Chen Zhenfang, Department of Electronic Physics-National Jiaotong University

A Review on Solar PV Based Grid Connected Microinverter Control Schemes and Topologies Manoharan Premkumara*, Kanagarathinam Karthicka, Rayichandran Sowmya Department of Electrical and Electronics Engineering, GMR Institute of Technology, Rajam, India

A Review on Solar PV Based Grid Connected Microinverter Control Schemes and Topologies Manoharan Premkumara*, Kanagarathinam Karthicka, Rayichandran Sowmya
 Department of Electrical and Electronics Engineering, GMR Institute of Technology, Rajam, India
 Department of Electrical and Electronics Engineering, National Institute of Technology, Tiruchirapalli, Tamilnadu, India
 ABSTRACT.
 From the last decade, there is an increase in the demand of electricity, this will causing depletion in the fossil fuels which results increase in cost. So the focus is shifted to use of renewable energy sources along with the only utility grid but it is not sufficient to supply the power different loads. To overcome these problems, micro-grid (MG) is introduced and it is powered by renewable distributed generation (DG) systems, such as, micro turbines, fuel cells, solar photovoltaic (PV) and wind generation due to the limited fossil fuel. Out of the above sources, solar energy provides extraordinary benefits including environmental friendly, surplus availability and low installation cost due to the advanced technology and mass production. The solar grid connected micro inverters gain lot of intention in past few years due to its simple construction, reliability and endurability. Moreover, the grid connected micro inverter has high reliability and it can operate in abnormal conditions also like variations in voltage and current. The micro-inverter has attracted recent market success due to unique features such as lower installation cost, improved energy harvesting, and improved system efficiency. This article gives detailed review on different topologies for grid connected solar PV micro-inverter and suggests the reliable, suitable and efficient topology for micro-inverter.
Keywords: Micro-grid, Distributed generation, Solar PV, Grid Inverter, Micro-inverter, Reliability
LINK
https://ejournal.undip.ac.id/index.php/ijred/article/view/16465/pdf
LINK
https://ejournal.undip.ac.id/index.php/ijred/article/view/16465

First Principles Design of Coreless Power Transformers By Angel J. Carvajal-Department of Electrical Engineering and Computer Science-Massachusetts Institute of Technology-MIT

First Principles Design of Coreless Power Transformers 

By Angel J. Carvajal Submitted to the Department of Electrical Engineering and Computer Science February 2, 2018 in Partial Fulfillment of the Requirements for the Degree of Master of Engineering in Electrical Engineering and Computer Science.

 ABSTRACT
 This thesis presents a theoretical foundation and methodology for designing novel 4-coil high frequency coreless power transformers from first principles via lumped equivalent circuit models. The procedure is applied to construct a design for 100W transformer with an 𝑆"# parameter value of .96. Using MATLAB and LTspice, simulation tools have been developed to produce accurate predictions of inductance, resistance, coupling coefficients, and 𝑆"# parameter values for an ensemble of coil models. These theoretical calculations have been employed for spiral and cylindrical coils and have been validated with numerous constructed experimental designs. The utility uses a first principles approach and derives these calculations directly from the physical parameters and relative positions of the coils. Simulation outputs greatly aid the engineering task of designing an efficient coreless power transformer. Thesis Supervisor: Dr. Chathan M. Cooke Title: Principle Research Engineer, RLE
LINK
https://dspace.mit.edu/bitstream/handle/1721.1/120875/1088894912-MIT.pdf?sequence=1&isAllowed=y

Como se fabrica um ônibus 100% elétrico da BYD-CAMPINAS-BRASIL

Rádio Ônibus visitou a fábrica da BYD na cidade de Campinas.

 Henrique Estrada entrevistou Adalberto Maluf, diretor de Relações Governamentais e Marketing. Perfil da Empresa BYD: Fundada em 1995, a BYD é uma empresa listada nas Bolsas de Valores de Hong Kong e Shenzhen. Atuamos na Indústria de TI, mais precisamente com baterias recarregáveis, aparelhos telefônicos, componentes eletrônicos e serviços de montagem; e na Indústria Automobilística com veículos convencionais a gasolina, assim como veículos elétricos e híbridos. Aplicamos também tecnologia superior no desenvolvimento de produtos e soluções de energia sustentável como parques solares, estações de armazenamento de energia, veículos elétricos, LED e empilhadeiras elétricas, entre outros. Atualmente, a BYD conta com 180.000 funcionários e 22 parques industriais na China e no exterior, distribuídos em uma área de quase 170.000.000 metros quadrados.
LINK: www.radioonibus.com

COMPARAÇÃO DE TRANSFORMADORES COM FATOR K E CONVENCIONAIS ALIMENTANDO CARGAS NÃO LINEARES-LUIZ PHELIPE DENARDIN CECATO RAPHAEL FERREIRA MINATO-UNIVERSIDADE TECNOLÓGICA FEDERAL DO PARANÁ DEPARTAMENTO ACADÊMICO DE ELETROTÉCNICA

UNIVERSIDADE TECNOLÓGICA FEDERAL DO PARANÁ DEPARTAMENTO ACADÊMICO DE ELETROTÉCNICA CURSO DE ENGENHARIA INDUSTRIAL ELÉTRICA - ÊNFASE ELETROTÉCNICA

LUIZ PHELIPE DENARDIN CECATO RAPHAEL FERREIRA MINATO

COMPARAÇÃO DE TRANSFORMADORES COM FATOR K E CONVENCIONAIS ALIMENTANDO CARGAS NÃO LINEARES
 Trabalho apresentado na disciplina de Projeto Final de Curso II como requisito parcial para a conclusão do Curso de Engenharia Industrial Elétrica - Ênfase em Eletrotécnica - do Departamento Acadêmico de Eletrotécnica, Universidade Tecnológica Federal do Paraná.
 Orientador: Prof. Joaquim Eloir Rocha, Dr.
CURITIBA 2007

RESUMO
O presente trabalho tem como objetivo a comparação da elevação de temperatura de transformadores com fator K e convencionais quando alimentando cargas não lineares. Foram desenvolvidos dois protótipos de 25kVA, sendo um deles um transformador convencional e um segundo com fator K. Foi desenvolvida, também, uma carga não linear de mesma potência e foram realizados ensaios de elevação de temperatura nos laboratórios da empresa que fabricou os transformadores e no Instituto LACTEC. São mostrados os resultados dos ensaios com carga não linear e carga senoidal de cada um dos transformadores e comprovado a eficácia dos transformadores com fator K perante os convencionais para os dois tipos de carga.
LINK
http://www.daelt.ct.utfpr.edu.br/engenharia/tcc/monografia_trafo_fator_k_2007.pdf