ON ACCOUNT OF ITS STOCHASTIC GENERATION, SYSTEMVOLTAGE FLUCTUATION IS ONE OF THE IMPEDIMENTS TO FURTHER INCREASETHE PENETRATION LEVEL OF THE Grid-CONNECTED PHOTOVOLTAIC SYSTEM.HOWEVER, THE REACTIVE POWER CAPACITY OF THE PHOTOVOLTAIC INVERTERCAN BE CONTROLLED TO REGULATE THE Grid VOLTAGE. IN THIS PAPER, THEOUTER CURRENT CONTROL LOOP, WHICH IS DESIGNED IN THE DQSYNCHRONOUS REFERENCE FRAME, IS PROPOSED TO GIVE THE SINGLE-STAGETHREE-PHASE Grid-CONNECTED PHOTOVOLTAIC SYSTEM THE OPPORTUNITYTO SOLVE THE VOLTAGE FLUCTUATION PROBLEM DURING THE DAYTIME. INORDER TO VERIFY THE PERFORMANCE OF THE PRESENTED CONTROLLER, SEVERAL SIMULATIONS ARE CARRIED OUT THROUGH MATLAB/SIMULINKIN DIFFERENT LOAD, SOLAR POWER GENERATION AND FAULT CONDITIONS.