Sistema de conversão de energia eólica baseado no gerador de indução duplamente alimentado: análise e contribuição ao controle da máquina
The humanity reached a time of unprecedented technological development. Science has achieved and continues to achieve technologies that allowed increasingly to understand the universe and the laws which govern it, and also try to coexist without destroying the planet we live on. One of the main c...
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Formato: | Dissertação |
Idioma: | por |
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Universidade Federal do Rio Grande do Norte
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Endereço do item: | https://repositorio.ufrn.br/jspui/handle/123456789/19279 |
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Resumo: | The humanity reached a time of unprecedented technological development. Science
has achieved and continues to achieve technologies that allowed increasingly to understand
the universe and the laws which govern it, and also try to coexist without destroying
the planet we live on. One of the main challenges of the XXI century is to seek and increase
new sources of clean energy, renewable and able to sustain our growth and lifestyle. It
is the duty of every researcher engage and contribute in this race of energy. In this context,
wind power presents itself as one of the great promises for the future of electricity generation
. Despite being a bit older than other sources of renewable energy, wind power still
presents a wide field for improvement. The development of new techniques for control
of the generator along with the development of research laboratories specializing in wind
generation are one of the key points to improve the performance, efficiency and reliability
of the system. Appropriate control of back-to-back converter scheme allows wind turbines
based on the doubly-fed induction generator to operate in the variable-speed mode,
whose benefits include maximum power extraction, reactive power injection and mechanical
stress reduction. The generator-side converter provides control of active and reactive
power injected into the grid, whereas the grid-side converter provides control of the DC
link voltage and bi-directional power flow. The conventional control structure uses PI
controllers with feed-forward compensation of cross-coupling dq terms. This control technique
is sensitive to model uncertainties and the compensation of dynamic dq terms
results on a competing control strategy. Therefore, to overcome these problems, it is proposed
in this thesis a robust internal model based state-feedback control structure in order
to eliminate the cross-coupling terms and thereby improve the generator drive as well as
its dynamic behavior during sudden changes in wind speed. It is compared the conventional
control approach with the proposed control technique for DFIG wind turbine control
under both steady and gust wind conditions. Moreover, it is also proposed in this thesis an
wind turbine emulator, which was developed to recreate in laboratory a realistic condition
and to submit the generator to several wind speed conditions. |
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