A MPPT algorithm based on the research of diode factor and reverse saturation current

In order to increase the output efficiency of a photovoltaic (PV) system it is important to have an efficient Maximum Power Point Tracker (MPPT). The approximately linear relation between the optimal output current and the short-circuit current was studied by theoretical analysis and simulation, the results showed that a piece of solar cell has fixed photocurrent under same temperature and irradiation conditions, but the optimal output current and voltage are different under different diode factor and reverse saturation current conditions. The compensate parameters for optimal output current of PV is gained by analyzing n and Io under different cost conditions, and a novel comprehensive compensation MPPT algorithm is described. The correctness of algorithm is proved by using the Perturb and observes (PO) method. Simulation results shown that the novel MPPT algorithm can track the actual maximum power point under various weather conditions.