Akademik Veri Yönetim Sistemi
9th International Aegean Congress on Innovation Technologies & Engineering, İzmir, Türkiye, 23 - 25 Şubat 2024, ss.203-204
To increase the utility of renewable energy sources in electrical energy production, low-cost
DC-DC converters with high voltage gain and efficiency are used as an interface. The desired
output voltage cannot be obtained with the series-connected form of solar panels, which are
renewable energy sources, due to the shadow effect and module incompatibility. In renewable
energy systems with low output voltage and high output current, there is a need to use high
voltage gain DC-DC converters to obtain the desired voltage of the grid system through
inverters. In applications requiring high voltage gain, the wide duty factor range of the
conventional boost converter causes low system efficiency and performance. Therefore, there
are many designs in the literature for DC-DC converters with high voltage gain and noninsulated coupled inductors due to their high performance for use in renewable energy
sources. In this study, non-isolated converters with cascade-connected coupled inductors are
discussed. Coupled inductor boost converters and topologies derived from them are more
notable than others due to the following advantages: high voltage gain ratio is achieved by
using fewer elements, some designed network structures such as active switched coupled
inductor network and reverse coupled inductor network can be integrated into the input
section of the converter, by integrating an extra boost converter circuit through a single
switching element, low input current ripple and a quadratic converter form can be achieved.
Generalized converter configurations of the topologies considered in this study are derived.
These configurations are grouped into two categories: input cascade-connection and output
cascade-connection forms of the converter. Then, the efficiency and performance evaluation
of representative topologies from each category was made. Considering a PV system
example, the efficiencies and comparison of these representative topologies were obtained
graphically using the simulation program data and the values of the manufacturer's element
data.