The simulation model of PV module in this paper is based on Simulink software, PV module's physical equivalent circuit and its mathematical model. Its basic parameters are the same as those of Solarex MSX60 60W, and other parameters are calculated with basic parameters and the mathematical model. This Simulink model can be used to show the U-I output characteristics of the 60W PV module under various insulations and temperatures. Meanwhile, this model can be applied to cases of other powers neatly and used to study module's parallel and serial characteristics. According to the output U-I characteristics, the U-P curve of the PV module is a single peak curve, which means that the PV module has a Maximum Power Point (MPP). On the basis of this Simulink model, Maximum Power Point Tracking (MPPT) methods are discussed. Among various MPPT methods, the incremental conductance method(IncCond) has an excellent control effect, so it is mainly discussed in this paper, and its control effect is compared with two of its improvements, which are two step-sizes IncCond and gradient variable step size IncCond. The two improved methods have both relaxed the restriction of the fixed step in IncCond. Setting the environmental parameters of the simulation model with the approximate variation of insulation in a day, the MPPT control of PV module is simulated. The simulation results further verify the accuracy of the model and the improved MPPT algorithm.
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