Grid Integrated Photovoltaic System with Active And Reactive Power Control Using Fuzzy Based Controller

Photovoltaic (PV) panels are costlier and have poor efficiency in energy conversion. Therefore, it is essential to utilize a PV based system effectively. The characteristics of PV cell are very much nonlinear that show only one point corresponding to maximum power on P-V curve when the insolation is uniform. But in partial shading situations, the P-V curve shows many peaks among which only one point corresponds to the maximum power. In this paper, grid interactive PV system is proposed with active as well as reactive power control capability even under partial shading conditions using a novel global peak power point tracking algorithm based on fuzzy logic. The proposed PV system delivers active as well as reactive power in presence of sunlight. In the absence of sunlight and under low insolation, the inverter of the PV system provides compensation of load reactive power otherwise inverter remains unutilized. This improves the utility of PV system and thus enhances the efficiency of the system. The proposed system is simulated for different partial shading and changing load conditions using MATLAB/SIMULINKTM. The simulation outcomes authenticate the performance and effectiveness of the proposed system for active and reactive power flow control with the proposed control approach.