Métodos de sincronismo de processadores digitais de sinais com a rede elétrica comercial, aplicados em geração de energia fotovoltaica

Abstract

The photovoltaic energy generation grows in the world and Brazil has a huge potential. The distributed photovoltaic generation requires synchronism between the controller device, usually a digital signal processor, and the commercial distribution electrical network. Several methods published in the literature were studied, though the vast majority doesn’t present all the information necessary for its use, requires too much processing, complex, voluminous and/or costly circuits, with some being patented. Thus, two synchronization methods based on phase-locked loops (PLL) were developed, with focus on simplicity and efficiency. The first method presented a range of operation from 46Hz to 66Hz and stabilization time after disturbance of at most 4 cycles of the electrical network. The second method presented a range of operation from 8Hz to 116Hz, with stabilization in at most 5 cycles of the network. Considering one distributed generation regulation studied, the range of operation of both methods were adequate. It is emphasized that the synchronization methods can be considered for other situations in which synchronism with the electrical network is necessary.