Developing a Bidirectional Interleaved Floating SEPIC Converter (BIF-SEPIC) for Standalone Photovoltaic Systems

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2020

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Saudi Digital Library

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In this work, it is proposed to investigate, design, and implement a topology of a bidirectional interleaved floating single-ended primary inductor converter (SEPIC). The performance of such converter is enhanced by applying a phase-shift technique. Such converters find wide applications in stand-alone photo voltaic systems with energy storage. The high voltage gain, high efficiency and low input current ripple of this converter has motivated the study of its application for standalone PV power system with energy storage. The previous researches concerned with an interleaved single ended primary inductor converter (SEPIC). The previous designs combined other topologies with the single-ended primary inductor converter (SEPIC). However, they didn't include the load-supply power exchange in a floating output design. They, through their designs, permit the load to handle its demanded power through one converter. In this work, the load voltage is composed of the outputs of two interleaved SEPIC converters. The positive terminal of the load is the output of the positive converter. The negative terminal of the load is the output of the negative converter. This results in what is known as floating output voltage. In the present proposed design many advantages could be gained. The interleaved topology ensures low ripple input current and low ripple output voltage. The bidirectional feature facilitates the load supply power exchange. The use of two converter structure allows the load to be fed by a floating voltage. The application of phase shifted VI pulse width modulation will reduce the power losses associated with the power switches. This topology design will be theoretically through a developed mathematical model investigated followed by a computer simulation. The converter will be implemented experimentally to verify the simulation results.

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