& Sciences Publication Pvt. Ltd. Reactive Power Controller Design for Single- Phase Grid- Connected Photovoltaic Systems

Abstract-Lack of adequate transmission capacity is a major impediment in connecting more of renewable energy sources (wind, solar) into the transmission grid.This paper at first presents a control algorithm for a single-phase grid-connected photovoltaic system in which aninverter designed for grid-connected photovoltaic arrays can synchronize a sinusoidal current output with a voltage grid. The power provided by the PV panels is controlled by a Maximum Power Point Tracking (MPPT) algorithm based on the incremental conductance method specifically modified to control the phase of the PV inverter voltage. The controller feeds maximum active power intogrid at unity power factor, whereas it also allows the adjustment of reactive power injected into the grid. Simulation results show that the control system has good performances. Index Terms — grid connected, photovoltaic system, reactiv