Regulador eletromagnético de frequência aplicado no controle de velocidade de geradores eólicos
The constant necessity for new sources of renewable energy is increasingly promoting the increase of investments in this area. Among other sources, the wind power has been becoming prominent. It is important to promote the search for the improvement of the technologies involved in the topologies...
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| Formato: | doctoralThesis |
| Idioma: | por |
| Publicado em: |
Universidade Federal do Rio Grande do Norte
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| Endereço do item: | https://repositorio.ufrn.br/jspui/handle/123456789/20227 |
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| Resumo: | The constant necessity for new sources of renewable energy is increasingly promoting
the increase of investments in this area. Among other sources, the wind power has
been becoming prominent. It is important to promote the search for the improvement of
the technologies involved in the topologies of the wind turbines, seeking for alternatives
which enhance the gotten performance, despite the irregularity of the wind speed.
This study presents a new system for speed control, in this case applied to the wind
turbines - the Electromagnetic Frequency Regulator (EFR). One of the most used devices
in some topologies is the mechanical gearboxes which, along with a short service life,
often represent sources of noise and defects. The EFR does not need these transmission
boxes, representing a technological advancement, using for that an adapted induction
machine, in which the stator becomes mobile, supportive to the axis of the turbine.
In the topology used in this study, the EFR also allows us to leave out the usage of the
eletronic converters to establish the coupling between the generator and the electrical grid.
It also the reason why it provides the possibility of obtaining the generation in alternating
current, with constant voltage and frequency, where there is no electrical grid.
Responsable for the mechanical speed control of the generator, the EFR can be useful
in other transmission systems in which the mechanical speed control output is the
objective.
In addition, the EFR operates through the combination of two inputs, a mechanical
and other electrical. It multiplies the possibilities of application because it is able
to synergistic coupling between different arrays of energy, and, for such reasons, it enables
the various sources of energy involved to be uncoupled from the network, being
the synchronous generator responsible for the system connection with the electrical grid,
simplifying the control strategies on the power injected in it.
Experimental and simulation results are presented through this study, about a wind
turbine, validating the proposal related to the efficience in the speed control of the system
for different wind conditions. |
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