Performance Analysis of Smart Grid-Integrated Battery Energy Storage Systems for Rural Distribution Networks

Battery Energy Storage Systems (BESS) have emerged as a critical component in modern smart grids, particularly for rural distribution networks where voltage instability, peak load variations, and renewable energy intermittency are common challenges. This study presents a comprehensive performance analysis of a grid-integrated BESS deployed in a rural 11 kV distribution feeder. Simulations were performed using MATLAB/Simulink to evaluate voltage stability, peak load shaving, renewable energy smoothing, and outage support functionality. Different battery chemistries, including Lithium-Ion, Lead-Acid, and Sodium-Sulfur, were analyzed with respect to efficiency, depth of discharge, response time, and lifecycle cost. Results indicate that Lithium-Ion BESS improves voltage stability by 12–15%, reduces peak load by up to 20%, and provides rapid response for renewable fluctuation compensation. Sodium-Sulfur batteries demonstrated strong energy density but limited suitability due to high operating temperature requirements. The findings highlight the transformative role of BESS in strengthening rural grids, improving power quality, and enabling higher renewable penetration.