Abstract
Bipolar DC grids have become an adequate solution for high-power microgrids. This is mainly due to the fact that this configuration has a greater power transmission capacity. In bipolar DC grids, any distributed generation system can be connected through DC-DC converters, which must have a monopolar input and a bipolar output. In this paper, a DC-DC converter based on the combination of single-ended primary-inductor converter (SEPIC) and Ćuk converters is proposed, to connect a photovoltaic (PV) system to a bipolar DC grid. This topology has, as main advantages, a reduced number of components and a high efficiency. Furthermore, it can contribute to regulate/balance voltage in bipolar DC grids. To control the proposed converter, any of the techniques described in the literature and applied to converters of a single input and single output can be used. An experimental prototype of a DC-DC converter with bipolar output based on the combination of SEPIC and Ćuk converters was developed. On the other hand, a perturb and observe method (P and O) has been applied to control the converter and has allowed maximum power point tracking (MPPT). The combined converter was connected in island mode and in parallel with a bipolar DC microgrid. The obtained results have allowed to verify the behavior of the combined converter with the applied strategy.
Highlights
Nowadays, the use of renewable energies is a reality
Bipolar DC grids have become an adequate solution for high-power DC microgrids
When compared grids,antheir main advantage in a greater transmission compared capacity. with monopolar DC grids, their main advantage lies in a greater power transmission capacity
Summary
The use of renewable energies is a reality. According to recent articles of economic/business analysis and electric/electronic industry publications, in many countries, this type of energy represents a high percentage of the energy consumed. Normalthe operation, the current through the with conductor volume or increase the transmission capacity.InFinally, DC bus can use a homopolar ground is zero It has two voltage levels, allowing, under fault conditions, a monopolar operation. Its main new DC-DC converter topology is usually proposed, which allows the connection each string advantage the reduction in the costs of insulation; the return current is double. It a of the maximum power point, any proposed technique for one input and one output converteriscan step-down/step-up converter This topology is effective for this type of application, with high efficiency be used [18,19,20,21,22,23,24].
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