Estudo e comparação entre três malhas de captura de fase para microrredes elétricas

Abstract

Microgrids play a very important role in the integration of distributed generators and one of the main factors for their stable operation is given by the behavior of voltage converters together with well­configured controllers. For these conditions to be achieved, it is necessary to use a tool that can monitor the system frequency by synchronizing the converter with the grid. In this paper, the SRF­PLL, MAF­PLL and DSOGI­PLL models were considered because they have simpler architectures than the other methods. Simulations were performed in Matlab reproducing events such as frequency step, presence of harmonics and unbalanced voltages, taking into account parameters such as damping and natural frequency. The result demonstrates that for the chosen parameters, the three models presented stability for the frequency step events, but only the DSOGI­PLL and the MAF­PLL remained stable under unbalanced voltages and only the MAF­PLL remained stable in the simulation with the addition of harmonics.