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VSC trifásico de 4 fios para compensar desequilÃbrio e carga não linear
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ISBN10: 6206816990
ISBN13: 9786206816997
Publisher: Edicoes Nosso Conhecimento
Published: Apr 30 2025
Pages: 88
Weight: 0.28
Height: 0.21 Width: 6.00 Depth: 9.00
Language: Portuguese
ISBN13: 9786206816997
Publisher: Edicoes Nosso Conhecimento
Published: Apr 30 2025
Pages: 88
Weight: 0.28
Height: 0.21 Width: 6.00 Depth: 9.00
Language: Portuguese
O uso de cargas não lineares na extremidade do consumidor na forma de conversores eletrónicos de potência, UPS, fornos elétricos a arco e o uso crescente de acionamentos de motor de velocidade ajustável está a aumentar a cada dia. A maioria dos problemas de poluição criados no sistema de energia é devido à natureza não linear das cargas, que injetam harmónicos no lado da fonte. Para superar este problema, o APF (filtro de potência ativa) ganhou mais atenção devido ao seu excelente desempenho na mitigação de harmónicos. A teoria da potência reativa instantânea (IRP), também conhecida como teoria p-q, pode ser usada para derivar um algoritmo de controlo para VSC trifásico de 3 fios e trifásico de 4 fios para mitigar correntes harmónicas sob carga não linear desequilibrada e desequilibrada. O VSC trifásico de 3 fios é a solução económica, mas tem algumas desvantagens. A falta de um fio neutro no VSC trifásico de 3 fios resulta em maiores perdas do filtro e, portanto, em menor eficiência. Duas técnicas de controlo, ou seja, controlo de corrente de banda de histerese e PWM baseado em portadora, são implementadas para três condições de carga diferentes. Em ambos os casos, o % THD foi reduzido de acordo com as normas IEEE 519. A redução de harmónicas é melhor no caso do método de controlo de corrente de histerese, pois requer apenas valor de largura de banda.
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