Power factor control of a photovoltaic system connected to grid under load variation

In this paper, a power factor control of PV system connected to the grid is established, the proposed model is based on two control loops: the first control loop regulates DC link voltage and the second one is used to keep the injected current to the grid in phase with the voltage by means of a Phase Locked Loop (PLL) in order to achieve a unit power factor and to adjust the output power as required. In order to examine the effectiveness of the suggested control, a simulation using the Matlab/Simulink software has been done and it's concluded from the simulation results that the presented control can be able to maintain maximum active power and to keep always a unity power factor despite variation load.