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Novel Maximum-Power-Point Tracking Algorithm For Grid-Connected Photovoltaic System

This paper presents a novel maximum-power-point (MPP) tracking algorithm for photovoltaic (PV) energy conversion systems. The algorithm is based on utilizing the relation between the PV array MPP current and the solar insolation level at different atmospheric conditions. Also, a single-stage grid-connected PV system is proposed to track the MPP of the PV array, using the new algorithm, and to produce a sinusoidal output current in phase with the utility voltage (i.e., to obtain a unity power factor). The power stage of the proposed system includes, mainly, a direct current–alternate current inverter, whereas the control stage is based on utilizing both the Proportional Integral (PI) and the P resonant controllers. The obtained results satisfy the desired performance for the proposed system.