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Advisor(s)
Abstract(s)
A conversão de energia elétrica a partir de fontes de energia renováveis tem
vindo a aumentar. A energia das ondas é uma mais valia, uma vez que as ondas do mar
apresentam uma elevada densidade energética.
Nesta dissertação propõe-se um dispositivo capaz de aproveitar a energia das
ondas para a conversão de energia elétrica, composto por um gerador linear acoplado a
uma mola magnética. Para isso, foi necessário estudar alguns tipos de molas magnéticas
existentes, efetuando simulações recorrendo a um programa de simulação de elementos
finitos, o FEMM e ao MATLAB. Foi criado um modelo dinâmico do sistema, de maneira
a simular o sistema boia-gerador em ambiente Simulink, analisando as suas respostas
quando submetido a uma onda linear.
De modo a ter uma ideia mais aprofundada do funcionamento da mola
magnética, foi desenvolvido um banco de ensaio, que permitiu analisar a força que uma
mola magnética consegue suportar em relação à distância total dos magnetos
permanentes que constituem a mola magnética.
The conversion of electricity from renewable energy sources has been increasing. Wave energy is an asset, since the waves have high energy density. This thesis proposes a device able to harness the energy of the waves for electric power conversion, composed of a linear generator coupled to a magnetic spring. For this purpose, we need to study several types of magnetic springs and to perform simulations using a simulation finite element program, the FEMM, and MATLAB. A dynamic model system was created, in order to simulate the float-generator system in Simulink, and to analyse its responses when subjected to a linear wave. In order to have a more detailed view of the operation of the magnetic spring, a test bench has been developed, which allowed analysing the force that a magnetic spring can withstand in relation to the total distance between the permanent magnets that constitute the magnetic spring.
The conversion of electricity from renewable energy sources has been increasing. Wave energy is an asset, since the waves have high energy density. This thesis proposes a device able to harness the energy of the waves for electric power conversion, composed of a linear generator coupled to a magnetic spring. For this purpose, we need to study several types of magnetic springs and to perform simulations using a simulation finite element program, the FEMM, and MATLAB. A dynamic model system was created, in order to simulate the float-generator system in Simulink, and to analyse its responses when subjected to a linear wave. In order to have a more detailed view of the operation of the magnetic spring, a test bench has been developed, which allowed analysing the force that a magnetic spring can withstand in relation to the total distance between the permanent magnets that constitute the magnetic spring.
Description
Dissertação de Mestrado, Engenharia Elétrica e Eletrónica, Especialização em Sistemas de Energia e Controlo, Instituto Superior de Engenharia, Universidade do Algarve, 2016
Keywords
Energia das ondas Molas magnéticas Modelo dinâmico Programa de elementos finitos Wave energy Magnetic springs The dynamic model A finite element program