GENERALIZED TOPOLOGIES, PERFORMANCE AND EFFICIENCY COMPARISON OF THE HIGH STEP-UP NON-ISOLATED CASCADE COUPLED INDUCTOR DC-DC BOOST CONVERTERS


Koç Y.

9th International Aegean Congress on Innovation Technologies & Engineering, İzmir, Türkiye, 23 - 25 Şubat 2024, ss.203-204

  • Yayın Türü: Bildiri / Özet Bildiri
  • Basıldığı Şehir: İzmir
  • Basıldığı Ülke: Türkiye
  • Sayfa Sayıları: ss.203-204
  • Van Yüzüncü Yıl Üniversitesi Adresli: Evet

Özet

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.