Design and analysis of high gain modified SEPIC converter for photovoltaic applications

摘要

In designing photovoltaic systems connected to the grid system usually DC-DC converter is required to increase the output voltage of the photovoltaic. The most commonly design of DC-DC converters are typically used a converters with high gain static in order to increase the output voltage of the photovoltaic and obtain a high conversion efficiency. One type of converter used is a SEPIC converter topology. However, the conventional DC-DC converter topologies such as SEPIC converters can only increase by 5 times of the input voltage when the Duty Cycle is set to 0.82. Meanwhile, to meet the dc input voltage of the inverter, the input voltage of the converters have to increase above than 10 times. Therefore, to overcome these problems, this paper proposes the design of DC-DC modified SEPIC converter topologies for photovoltaic applications. Modifications to the conventional SEPIC converter is done by adding capacitors and diodes. From the experimental results shows that this converter can increase the output voltage about 10 times and has the efficiency about 91.5%. Furthermore, topology of the this converter can be effectively applied for photovoltaic system.