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Publication
Single-switch bipolar output DC-DC converter for photovoltaic application
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| 2.84 MB | Adobe PDF |
Advisor(s)
Abstract(s)
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 C´ uk 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 e ciency. 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 C´ uk 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.
Description
Keywords
Bipolar DC microgrid Photovoltaic energy DC-DC converter