Mitigação de variações de tensão de curta duração em redes de distribuição usando unidades eólicas de geração
The short duration voltage variations are typical disturbances that significantly affect the power quality in distribution systems. The typical devices for voltage support and regulation, distributed along the distribution networks, are generally not capable of mitigating short duration voltage vari...
| Autor principal: | Comelli, Alecio |
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| Formato: | Dissertação |
| Idioma: | Português |
| Publicado em: |
Universidade Tecnológica Federal do Paraná
2014
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| Assuntos: | |
| Acesso em linha: |
http://repositorio.utfpr.edu.br/jspui/handle/1/758 |
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| Resumo: |
The short duration voltage variations are typical disturbances that significantly affect the power quality in distribution systems. The typical devices for voltage support and regulation, distributed along the distribution networks, are generally not capable of mitigating short duration voltage variations. However, distributed generation units connected to the distribution system, when associated with suitable control
strategies, can be able to mitigate short duration voltage variations. In this context,
this paper proposes the mitigation of short duration voltage variations by using wind
power generating units based on permanent magnet synchronous generator (PMSG)
connected to the network by static power converter. The voltage variation mitigation
is performed by means of a supplementary control loop added to the traditional
control of the grid-side converter. The proposed control strategy takes advantage of
the overload capability of the wind generation unit and it is able to mitigate short duration voltage variations in distribution systems. The proposed supplementary control loop limits the generated reactive power based on the overload capability of the generation unit, avoiding that the power electronic converter exceeds its thermal limit. Besides the proposed supplementary control loop, a methodology based on power flow studies is proposed in order to evaluate the voltage regulation capability of the wind generation associated with the proposed control loop. The performance and effectiveness of the control strategy proposed to mitigate short duration voltage variations is evaluated by means of time-domain non-linear simulations regarding a distribution network with lumped load. Different levels of integration of wind
generation on the distribution network and other factors that directly impact on
voltage regulation are considered in the tests. The performed evaluations have
demonstrated that the proposed control strategy, applied to wind generation units,
can significantly contribute to the maintenance of the voltage profile of distribution systems during the occurrence of short duration voltage variations. |
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