Análise de Desempenho dos Métodos de Sincronismo Monofásicos SRF-PLL e NRF-PLL sob Condições de Distorções da Rede Elétrica

Abstract

The emergence and increasing adoption of new technologies for energy generation and consumption have heightened the intermittency of electrical grids, thereby adding complexity to the operation of control and protection devices. Among the challenges is the synchronization between distributed energy resources, such as photovoltaic arrays, and the grid itself. Consequently, robust synchronization structures are required to ensure the quality of electric power within these networks. Algorithms such as Phase Locked Loop (PLL) are synchronization methods employed, for instance, in grid-connected photovoltaic inverters to ensure the synchronization of the generation system with the grid voltage. Due to the numerous PLL structures and variations found in the literature, this study aims to perform an analysis of two single-phase implementation structures: the SRF-PLL (Synchronous Reference Frame-PLL) and the NRF-PLL (Natural Reference Frame-PLL). The objective is to assess performance parameters under adverse grid conditions. The results revealed that the SRF-PLL method achieves quicker synchronization, albeit with compromised performance in the presence of harmonic distortion. Furthermore, the oscillations of the NRF-PLL method are mitigated by the Moving Average Filter (MAF), particularly in scenarios with grid harmonics.