DESIGN OF NON-ISOLATED DC-DC CONVERTER FOR PHOTOVOLTAIC APPLICATION

Abstract

The increasing integration of photovoltaic (PV) systems into modern power networks requires efficient power conversion to overcome the inherent variability of solar energy. This paper presents the design and analysis of a DC–DC power converter for photovoltaic applications, aimed at maximizing energy extraction and ensuring regulated power delivery to the load or grid. A suitable converter topology is optimized to match the PV module characteristics, and Maximum Power Point Tracking (MPPT) algorithms are implemented to enhance system efficiency under varying irradiance and temperature conditions. This thesis presents the design and analysis of a quadratic boost converter (QBC) for photovoltaic applications. The quadratic boost converter provides higher voltage gain compared to conventional boost converters without requiring extreme duty cycles. The proposed converter consists of two inductors, two capacitors, a diode network, and a controlled switching device to achieve quadratic voltage amplification. The converter is designed to improve voltage gain, reduce switching stress, and increase efficiency in solar energy systems. A maximum power point tracking (MPPT) technique is incorporated to extract maximum power from the PV module under varying environmental conditions. MATLAB/Simulink simulations are used to evaluate the performance of the proposed converter. Simulation results shows that the quadratic boost converter effectively increases the output voltage and improves system efficiency while maintaining stable operation. The proposed system is suitable for renewable energy applications such as DC microgrids, battery charging systems, and solar-powered electronic devices.