The three-phase four-wire VSCs voltage source converters are used to connect sustainable sources to the distribution system where the loads are predominantly single-phase. The three-phase distribution system with unbalanced neutral has unwanted negative and zero sequence components. In this condition the synchronism between the VSC and the electrical grid that is done using the PLL (Phase Locked Loop) is affected. SRF-PLL (Synchronous Reference Frame-PLL) is popularly used, however it does not perform well in unbalanced systems. DSOGI-PLL (Dual Second Order Generalized Integrator-PLL) ensures synchronism between the VSC and the unbalanced power grid. Thus, the purpose of this article is to evaluate the effect of imbalance in ac currents of the VSC using the SRF-PLL and DSOGI-PLL Resumo: Os conversores fontes de tensão VSCs trifásicos a quatro fios são utilizados na conexão de fontes sustentáveis ao sistema de distribuição onde as cargas são predominantes monofásicas. O sistema de distribuição trifásico desequilibrado com neutro apresenta componentes indesejados de sequência negativa e zero. Nestas condições, o sincronismo entre o VSC e a rede elétrica que é feito utilizando o PLL (Phase Locked Loop) é afetado. O SRF-PLL (Synchronous Reference Frame-PLL) é popularmente utilizado, entretanto não garante o sincronismo entre o VSC e a rede elétrica desequilibrada. O DSOGI-PLL (Dual Second Order Generalized Integrator-PLL) garante o sincronismo entre o VSC e a rede elétrica desequilibrada. Assim, objetivo deste artigo é avaliar o efeito do desequilíbrio de tensão nas correntes ca do VSC utilizado o SRF-PLL e DSOGI-PLL.
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