Bipolar DC grids have become an adequate solution for high-power microgrids. This is\nmainly due to the fact that this configuration has a greater power transmission capacity. In bipolar DC\ngrids, any distributed generation system can be connected through DC-DC converters, which must\nhave a monopolar input and a bipolar output. In this paper, a DC-DC converter based on the\ncombination of single-ended primary-inductor converter (SEPIC) and C´ uk converters is proposed,\nto connect a photovoltaic (PV) system to a bipolar DC grid. This topology has, as main advantages,\na reduced number of components and a high efficiency. Furthermore, it can contribute to\nregulate/balance voltage in bipolar DC grids. To control the proposed converter, any of the techniques\ndescribed in the literature and applied to converters of a single input and single output can be used.\nAn experimental prototype of a DC-DC converter with bipolar output based on the combination of\nSEPIC and Cuk converters was developed. On the other hand, a perturb and observe method (P\nand O) has been applied to control the converter and has allowed maximum power point tracking\n(MPPT). The combined converter was connected in island mode and in parallel with a bipolar DC\nmicrogrid. The obtained results have allowed to verify the behavior of the combined converter with\nthe applied strategy.
Loading....