An improved method and simulation of tracking the maximum power point for Photovoltaic gene ration system

In the Photovoltaic(PV) power system, lighting intensity and air temperatur have great effect on the output characteristic PV cells which has distinct nonlinear characteristics. In this paper an improved method of perturb and observe (P&O) is proposed, based on the comparison of power, and then the simulation model on the platform of matlab/simulink is established. In comparison with traditional variable step-size P&O and InCond, this strategy can achieve better performance, and in the steady-state conditions it leads to lower oscillations and fewer power loss around the maximum power point. The improved method provides a quick and accurate tracking even in the conditions of irradiation change and it is proved to be a good method to realize the MPPT controlling of PV cells.