It is necessary to track the maximum power point(MPP) of the PV array rapidly and accurately and it can increase the output power of photovoltaic array.This article summarizes the methods of Maximum Power Point Tracking(MPPT),including the Perturb-and-observation Method and Incremental Conductance Method and points out the limitations and notes of those two methods.This paper divides a number of different techniques for MPPT of PV arrays into four groups by the control theory and development process of MPPT...