Grid Connected PV System with New MPPT Estimation Method Based on Measuring Cells

Different maximum power point tracking methods have been developed for photovoltaics systems to extract and inject the maximum power to the grid. This paper introduces an algorithm based on the solar mathematical model and two measuring cells, one in open circuit and other in short circuit. The proposed method uses the model and adjusts the unknown PV internal system variables to specify where the maximum power point (MPP) is placed in the plane I-V or P-V. The PV array, together with a three-phase inverter, controlled by a nonlinear feedback control algorithm, are employed to inject electric power to grid, where the dc voltage of the power converter is regulated to track the MPP. Finally, the results show the feasibility of the proposal where the MPP is accurately estimated by the proposed algorithm.