Fuzzy Direct Power Control for Enhanced Power Quality Generated by PV System

Photovoltaic energy is widely used, because it is clean, free and its technology is now well mastered. This paper presents a new fuzzy direct power control (FDPC) technique to control the active power extracted from the photovoltaic array and sent to the grid, to compensate the reactive power and to reduce the total harmonic distortion (THD) of the grid current caused by the connection of non-linear loads. A fuzzy inference system is used to select the switching states of the inverter, and its input includes active/reactive power variations and the position of the line voltage vector. To illustrate the performance of the proposed technique in a grid-connected photovoltaic system, a simulation model was developed using Matlab/Simulink and Sim Power System, under variable irradiation and non-linear load connected to the grid. The simulation results demonstrate the effectiveness of the proposed FDPC technique.