As for the issue that the traditional perturbation observation method is difficult to take into account both the tracking speed and the steady state accuracy

a MPPT compound control strategy based on perturbation observation method and Newton interpolation method is proposed in this paper. The long distance perturbation observation method is used to locate the maximum power point

and then the Newton in-terpolation method is used to fit the approximate curve to calculate the maximum power point position exact-ly in accordance with the fitting curve. The MPPT simulation model based on Boost circuit is built by Simu-link simulation platform. It shown by the simulation result that the new MPPTT composite algorithm not on-ly has faster tracking speed

but also avoids effectively the steady oscillation

which has a definite significance in improving the efficiency of photovoltaic systems.