A Low-Voltage Ride-Through strategy using fuzzy based controller for 3phase grid connected PV system

A PV system which is connected to the grid, will get disconnected when a fault occurs on the gird side due to the over-current protection. But, according to new grid codes the PV system should be connected to the grid even under fault condition to ensure the continuity of the power supply which is termed as low voltage ride through capability (LVRT) of the system. The system along with providing LVRT support also provides reactive power support under voltage sag condition. To improve the harmonics condition, the PI controller in the current controller loop is replaced by the Fuzzy controller and the system behavior is studied under different fault condition. The Proposed Simulation results show the tremendous reduction in total harmonic reduction (THD) using Fuzzy Logic controller (FLC) compared to Proportional Integral (PI) Controller.