《A Single-Phase Grid-Connected PV System 》.pdf

INTERNATIONAL JOURNAL of CIRCUITS, SYSTEMS and SIGNAL PROCESSING Issue 1, Volume 2, 2008 A Single-Phase Grid-Connected PV System With Active Power Filter Denizar C. Martins and Kleber C. A. de Souza fed to the utility. The balance of power flow is controlled Abstract—In this paper a single-phase active power filter based through the inverter. The inverter also is used to act always as in a two stages grid-connected photovoltaic system is presented. The an active power filter to compensate the load harmonics and proposed system can not only inject PV power into utility but can act reactive power such that the input power factor is unity (Fig. always as an active power filter to compensate the load harmonics 2). and reactive power such that the input power factor is unity independently of the solar radiation. In sunny days, the system processes all the reactive and active load power and the excessive II. PROCEDURE FOR PAPER SUBMISSION power from the PV module can be fed to the utility. On the other The dc-dc converter power structure used to boost the PV hand, on cloudy days for instance, if the PV power is not enough, the voltage and for tracking the maximum power point of the PV system processes all the reactive load power and the shortage of load modules to fully utilize the PV power was the Half-Bridge active power is supplemented by the utility. Besides, just using one current sensor, the control strategy is simpler