Power Quality Improvement Performance of PV and Grid Connected System

Abstract

This paper presents the design and simulation of a hybrid renewable energy system integrating solar photovoltaic (PV), battery storage, and fuel cell subsystems for improved power quality and reliable energy supply. The proposed system is developed in the MATLAB/Simulink environment, where the PV array generates DC power that is regulated using a DC/DC boost converter with Maximum Power Point Tracking (MPPT) to ensure maximum energy extraction. The battery subsystem, connected through a bidirectional DC–DC converter, enables efficient energy storage and management by supporting both charging and discharging operations based on system demand. Additionally, a fuel cell subsystem is incorporated as a backup power source to enhance system reliability during low renewable generation conditions. All energy sources are integrated through a common DC-link, which acts as a voltage stabilization unit. The DC-link output is then converted into AC using a voltage source inverter (VSI) and supplied to the load or grid through appropriate filtering components to reduce harmonics and improve power quality. Advanced control strategies are implemented to regulate DC-link voltage, manage energy flow, and ensure stable system operation under varying conditions. The simulation results demonstrate that the proposed system achieves stable voltage regulation, efficient energy management, reduced harmonic distortion, and improved dynamic response, making it suitable for modern grid-connected and standalone renewable energy applications.