Grid-connected photovoltaic systems for grid voltage correction

Researchers have invented recently the grid-connected photovoltaic systems to compensate for the power consumption of loads connected to grid either partially or totally. In this paper, grid-connected photovoltaic systems are used also to solve the electric grid problems, specifically any disturbance in amplitude of the grid voltage at the point of common coupling (PCC) by controlling the amount of injected active current, keeping on zero-reactive current injection to sustain the synchronization and unity power factor. In case of grid undervoltage, the photovoltaic system supplies more energy to the non-zero impedance grid to increase the grid voltage. In case of grid overvoltage, the photovoltaic system supplies less energy to this grid to decrease the grid voltage. A control method is presented and the required simulation by Matlab/Simulink is done verifying the expected results.