Isolated PV System with Fuzzy Logic based MPPT Controller and Battery Management System

Photovoltaic (PV) based isolated power system is gaining more popularity for off grid applications. To tackle recurring nature of solar, maximum power point tracking (MPPT) is used to ensure the optimal operation of PV system and to extract the maximum power for any available irradiance. In standalone PV systems, usually a battery acts as a standby for power management, and to ensure continuity of supply to the load even at low solar irradiance. This paper proposes a fuzzy logic based MPPT control together with a novel battery management system (BMS) for an isolated PV system. A comparison is made between the conventional P&O method and fuzzy logic control to understand the accuracy of the proposed FLC. By designing BMS with a novel algorithm considering various constraints, it ensures proper protection of the load as well the battery. Different parameters like output voltage maximum power, status of battery obtained by considering different irradiances (100W/m², 500W/m²,1000W/m²) are analyzed. The simulation results of the overall system are also demonstrated to validate the theoretical analysis, effectiveness and feasibility of the proposed system.