Buscar
Itens para a visualização no momento 1-10 of 215
Projeto e desenvolvimento de um microinversor buck de elevado rendimento conectado à rede elétrica com filtro LCL
(Universidade Federal de Santa Maria, 2018-08-06)
Micro-inverters are small single-phase photovoltaic power generation modules that connect directly to
a photovoltaic panel and the electrical grid, which typically consist of a DC-DC stage and a DC-AC
stage. The topology ...
Indicador de vulnerabilidade operacional para priorização e substituição de transformadores de potência em subestações
(Universidade Federal de Santa Maria, 2018-02-19)
This thesis presents a new methodology for the classification and substitution of power
transformers in substations. The thesis proposes the use of the Operational Vulnerability
Indicator (OVI), which consists of two ...
Estratégias multimalhas para controle de corrente de inversores conectados à rede por meio do filtro LCL
(Universidade Federal de Santa Maria, 2018-02-26)
This master thesis presents contributions to the study and development of current
control of the grid-tied inverter through an LCL filter, by using multiloop control strategies.
In the first proposed scheme, the inner ...
Uso de abordagem heurística para o problema do quadro de horários e alocação de salas de aula
(Universidade Federal de Santa Maria, 2018-09-14)
This study is about the problem to elaborate the teachers’ timetabling and the classroom assignment in Instituto Federal Farroupilha - Campus Avançado Uruguaiana. This task is already known because of its complexity and ...
Práticas inovadoras no setor de e-commerce no Brasil
(Universidade Federal de Santa Maria, 2018-03-09)
With the speed of changes occurring in the global market, companies need to be constantly updated and in search of new strategies to win and retain their customers. In this sense, the Internet becomes an important tool to ...
Obtenção e caracterização de biocarvão a partir de bagaço de malte oriundo de cervejarias para utilização como adsorvente do corante azul de metileno
(Universidade Federal de Santa Maria, 2018-07-16)
An alternative activated biochar was developed from barley malt bagasse (BMB) through pyrolysis followed
CO2 activation. The materials BMB, biochar and activated biochar (CO2–biochar) were characterized and
tested as ...
Estudo dos fatores de risco associados à evasão de alunos de graduação da Universidade Federal de Santa Maria
(Universidade Federal de Santa Maria, 2018-01-12)
Currently, Higher Education Institutions (HEIs), especially public ones, express great
concern regarding the adequate qualification of their students and assurance of
adequate results in terms of numbers of graduates who ...
Sistema de controle para conversores modulares multiníveis utilizados em conexões HVDC de parques eólicos offshore
(Universidade Federal de Santa Maria, 2018-02-27)
This work presents a brief history of the wind generation system in general and
the detailed history of the offshore wind generation system. Current data on installed
capacity, power of used wind turbines and distance ...
Estimação fasorial para relés de proteção numéricos usando redes neurais artificiais e o algoritmo de Levenberg-Marquardt
(Universidade Federal de Santa Maria, 2018-03-16)
In this work, two methodologies for phasor estimation in numerical protective relays in
Electrical Power Systems will be presented: one based on Artificial Neural Networks, and another
based on the Levenberg-Marquardt ...
Método para detecção de oscilação de potência no domínio do tempo
(Universidade Federal de Santa Maria, 2018-03-09)
This work proposes two techniques for the detection of power swings and blocking of distance
relays on transmission lines to prevent undue shutdowns. If a fault occurs during power swing,
it must be immediately detected ...