Advanced Design and Implementation of Modified SEPIC Converter Integrated with Grid Connected PV System: Performance Evaluation under Various Environmental Conditions

Abstract

The escalating popularity of solar energy, propelled by environmental consciousness, government initiatives, and its inherent accessibility underscores a pivotal shift towards sustainable power sources. However, the seamless integration of solar energy into the utility grid remains a formidable challenge for researchers. This complexity arises from multifaceted factors encompassing electrical apparatus, DC/AC conversions, diverse voltage levels, adherence to complex grid codes, and the imperative for precision in modeling techniques. In response to these challenges, this research paper propounds a dynamic model designed to mitigate the integration issues between photovoltaic (PV) systems and the grid. The model comprises of solar PV array, VSC (Voltage Source Inverter), DC-DC boost converter, transformer, LCL filter, and associated control circuitry. One of the significant contributions involves designing and implementing a modified SEPIC boost converter for the system. Through MATLAB simulations, the study showcases substantial enhancement in both efficiency and overall performance when compared to the conventional dc-dc boost converter.