Abstract: In order to improve the efficiency of PV system, A perturbation and observation (P&O) method is proposed to track the maximum power point of PV system. Based on the mathematical model of PV system, this method track the maximum power point by regulating the output voltage after measuring the changes of output power. A Matlab-Simulink based study of PV cell and module / PV array is carried out and presented in this paper. Basically focuses on the Photovoltaic cell five parameters consisting on a current controlled generator series diode, a shunt resistance and series resistances. The experimental results show that the method can track the maximum power point fast and exactly, which shows that adaptive P&O has better steady state and dynamic performance than the traditional P&O, and can improve the efficiency of photovoltaic power generation system effectively.

Keywords: PV panel, MPPT, modeling, simulation, experimental results.