Power Quality Improvement of PV-Battery based Hybrid Standalone AC Microgrid

Abstract

Electricity generation through Photovoltaic (PV) for power supply in rural areas is one of the best solution to solve many problems. The standalone power supply by using PV system is attracting by many scholars. However, storage systems like batteries are mandatory to maintain energy management as well as power quality in PV based standalone systems due to random variations in both solar irradiance as well as load. However, the operation of AC loads requires an inverter. Similarly, a bidirectional DC to DC converter is necessary to handle the discharging and charging process of the battery based on the power difference between generation and load. Even during nighttime when there is no power available from PV panels, the battery must supply the power demanded by the loads. To ensure high-quality power supply at the load bus, a novel control system for the inverter has been implemented. Additionally, this paper proposes a novel energy management system to maintain power balance between generation and load. A maximum power point tracker (MPPT) converter has also been integrated into the PV system using the perturbed and observe (P&O) algorithm. Extensive results, obtained through the MATLAB/Simulink package, are presented to demonstrate the significance of the proposed controllers under various operating conditions. The performance of the proposed control schemes remains satisfactory even when the standalone system undergoes various changes.