A fast method of maximum power point tracking for PV

In order to ensure that the PV module always works at the maximum point of power to increase the system's overall efficiency, maximum power point tracking is crucial, since the output power of solar panels is influenced by special nonlinear conditions, such as outside temperature, light intensity and impact of load. This paper presents a novel photovoltaic maximum power point tracking method. The theoretical simulation shows that while the temperature is constant, the output voltage changes little, and with the change of the light intensity, the maximum power point approximates into a straight line, namely the maximum power point and the corresponding output current have a linear relationship. The proposed maximum power point tracking method is based on the maximum power point estimated and the corresponding linear output current curve, dividing the P-I output curve into two regions, and adjusting the output current through different control criteria in different regions, so as to reach its maximum power current rapidly, which achieves maximum power point tracking purposes. The simulation results carried out by Matlab/Simulink show that this method is different from the previous disturbance observer control strategy, which not only can ensure the fast maximum power point tracking of PV module, but also will not lead to the frequent fluctuations at the vicinity of the maximum power point. Finally, it is verified by tests.