A Power Management and stability improvement for Grid- connected PV Integrated with Hybrid Energy Storage System

Abstract

The increasing penetration of photovoltaic (PV) generation into power grids introduces challenges such as power intermittency, voltage fluctuations, and reduced system reliability. Hybrid Energy Storage Systems (HESS), combining batteries and supercapacitors, provide an effective solution by leveraging the high energy density of batteries and the fast dynamic response of super-capacitors. This paper proposes a fuzzy logic–based energy coordination strategy for a grid-integrated PV system equipped with battery–super-capacitor hybrid storage. The fuzzy controller dynamically allocates power between the battery and super-capacitor based on PV power variations, load demand, and stateof-charge (SOC) conditions. The proposed scheme enhances power smoothing, reduces battery stress, and improves grid power quality. MATLAB/Simulink-based simulation results demonstrate superior performance in terms of reduced power fluctuations, improved DC-link voltage regulation, and extended battery lifespan compared to conventional rule-based control strategies