A Robust High Gain Integrated Z source SEPIC Converter for PV Applications

Abstract In this research article, the technique of integration is considered to enhance the performance and voltage gain of the Single Ended Primary Inductor Converter (SEPIC). Since, the current energy scenario focuses on maximizing the usage of Photovoltaics (PV) systems and Electric Vehicles (EVs), which support low-to-zero carbon emission. The role of an effective DC-DC converter design becomes crucial owing to their significance as power regulators in both these applications. So far, numerous high-gain converter topologies have been published, but these topologies have complex structures, which are bulky and expensive. Hence a cost-effective converter design capable of achieving high voltage gain is proposed in this work by integrating a Z-source converter to SEPIC. The Z-source converters are highly reliable with a wide voltage conversion range, lower ripple current, and minimum in-rush current, whereas the SEPIC converter comes with the benefits of input-output isolation, non-inverted output voltage polarity, and continuous input current. Moreover, the mathematical modeling, modes of operation, and voltage stress of the suggested converter design are also presented in the article. Additionally, the Cascaded Fuzzy Logic Controller (CFLC), effective in delivering quick accurate error compensation is employed in this work for sustaining the constant converter output. The results from MATLAB simulation and lab-scaled prototype execution credibility to the operation of the suggested converter as it achieves an impressive 97% efficiency.