Compensação de desequilíbrios em redes trifásicas a quatro fios utilizando dispositivos híbridos
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Data
2017-09-08
Autores
Oliveira, Rodrigo Alessandro Nunes de [UNESP]
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Editor
Universidade Estadual Paulista (Unesp)
Resumo
Em sistemas trifásicos de potência as tensões entregues pela fonte são senoidais, iguais em magnitude e com defasamento angular de 120° entre fases. Contudo, as tensões resultantes nos pontos de utilização podem ser desbalanceadas por diversas razões. A natureza do desbalanceamento inclui magnitudes, e/ou diferentes defasagens angulares, entre fases das tensões. Nos sistemas de distribuição de energia elétrica são encontradas as maiores causas para geração de desequilíbrios de tensão, devido à distribuição irregular de cargas por fase, as quais variam constantemente devido à inserção e/ou retirada das mesmas. Visando a implantação de dispositivos de compensação de desequilíbrios que utilizem o menor número de componentes eletrônicos, apresentem mecanismos de controle simplificados e que sejam menos sensíveis a distúrbios na rede elétrica, apresenta-se um arranjo topológico como contribuição original deste trabalho. Destaca-se que o arranjo proposto atende às prerrogativas preconizadas e nestas condições, vislumbra-se um desempenho operacional robusto e a custo reduzido quando comparado às demais estruturas de compensação em utilização.
In three-phase power systems, the voltages delivered by the source are sinusoidal, has equal magnitudes and 120° angular phase difference between phases. However, the resulting voltages at the consumer points may be unbalanced for several reasons. The nature of the imbalance includes different magnitudes, and/or angular phase shift, between the phases of the voltages. In electrical power distribution systems, the greatest cause for voltage unbalances are due to the irregular distribution of loads per phase, which vary constantly due to the load insertion and/or removal. With the aim of implementing a unbalance compensation device that use the least number of electronic components, has a simplified control technique and are less sensitive to electrical network disturbances, a topological arrangement is presented as the original contribution of this work. It should be noted that the proposed arrangement meets the intended prerogatives and, under these conditions, it is possible to foresee a robust and low operational-cost performance, when compared to the other compensation structures already in use.
In three-phase power systems, the voltages delivered by the source are sinusoidal, has equal magnitudes and 120° angular phase difference between phases. However, the resulting voltages at the consumer points may be unbalanced for several reasons. The nature of the imbalance includes different magnitudes, and/or angular phase shift, between the phases of the voltages. In electrical power distribution systems, the greatest cause for voltage unbalances are due to the irregular distribution of loads per phase, which vary constantly due to the load insertion and/or removal. With the aim of implementing a unbalance compensation device that use the least number of electronic components, has a simplified control technique and are less sensitive to electrical network disturbances, a topological arrangement is presented as the original contribution of this work. It should be noted that the proposed arrangement meets the intended prerogatives and, under these conditions, it is possible to foresee a robust and low operational-cost performance, when compared to the other compensation structures already in use.
Descrição
Palavras-chave
Compensação de desequilíbrios, Reator controlado, Dispositivos eletromagnéticos, Arranjos híbridos, Unbalance compensation, Controlled reactor, Electromagnetic devices, Hybrid topology