No Blog Eletrônica de Potência você encontrará informações sobre teses,artigos,seminarios,congressos,tecnologias,cursos,sobre eletrônica potência.
“TEMOS O DESTINO QUE MERECEMOS.
O NOSSO DESTINO ESTA DE
ACORDO COM OS NOSSOS MERITOS”
ALBERT EINSTEIN.
Imagination is more important than knowledge, for knowledge is limited while imagination embraces the entire world.
EL FUTURO SE CONSTRUYE HOY,EL SUCESSO NO ES FRUTO DE LA CASUALIDAD,SE HUMILDE ,APRENDE SIEMPRE CADA DIA.
AUTOR DO BLOG ENG.ARMANDO CAVERO MIRANDA SÃO PAULO BRASIL
"OBRIGADO DEUS PELA VIDA,PELA MINHA FAMILIA,PELO TRABALHO,PELO PÃO DE CADA DIA,PROTEGENOS DO MAL"
“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”
Abstract A Study on Control and Grid Synchronization for a Three-phase Gridconnected
Inverter in Distributed Generation Systems
Lai Ngoc Bao
(Supervisor Kim, Kyeong-Hwa)
Dept. of Electrical and Information Engineering
The Graduate School
Seoul National University of Science and Technology
This thesis presents an improved current control strategy for a three-phase grid-connected
inverter under distorted grid conditions. The primary challenge associated with the gridconnected
inverter in distributed generation (DG) systems is to maintain the harmonic
contents in output current below the specified values even when the grid is subject to
uncertain disturbances such as harmonic distortion. To address such a challenge, an
improved current control scheme is proposed for a grid-connected inverter, in which the
fundamental and harmonic currents are independently controlled by a PI decoupling
controller and a predictive basis controller, respectively. The controller design approach is
based on the model decomposition principle, where the measured inverter currents and
grid voltages are split into the fundamental and harmonic currents using moving average
filters (MAFs). Furthermore, to detect the grid angular displacement and frequency with
better accuracy even in the presence of the grid voltage disturbances, the MAF is also
introduced to construct an enhanced phase-lock loop (PLL) scheme. Theoretical analyses
as well as comparative simulations results prove that the proposed control scheme
adequately compensates the abnormalities caused by the grid voltage disturbances with
fast transient response. To validate the feasibility of the proposed control scheme, the
iientire
control algorithm is implemented on a 2 kVA three-phase grid-connected inverter
system using 32-bit floating-point DSP TMS320F28335. As a result, the proposed
scheme is an attractive way to control a grid-connected inverter under adverse grid
conditions.
Leakage Inductance Determination for Transformers with Interleaving of Windings R. Doebbelin and A. Lindemann Institute of Electric Power Systems, Otto-von-Guericke-University Magdeburg, Germany
Abstract| A diversity of formulas is given in literature for leakage inductance calculation
of transformers with interleaving of windings. In the paper, the meaning of included terms and
details of the application for concentric and pie windings transformers shall be discussed. Consid-
ering the limitation of common formulas to magnetically symmetric transformers an alternative
approach shall be demonstrated, which enables leakage inductance prediction also in the case of
transformers with magnetically asymmetric arrangements of windings.
Alta confiabilidade: Controle microprocessado DSP, combinando tecnologia SPWM e chaveamento de potência em alta frequência
Modo de operação selecionável: Prioridade armazenamento ou fornecimento de energia
Prevenção de danos: por atenuação PID garantindo a vida útil plena dos painéis fotovoltaicos
Gerenciamento de baterias: Carregador com três estágios, reduzindo o tempo de recarga e protegendo contra descarga profundal de baterias
Alimentação: AC: com sincronismo on-line, minimizando o tempo de transfência garantindo o fornecimento de energia à carga
Seleção automática: de frequência (60/50Hz)
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