Research on Maximum Power Point Tracking Method for Grid-Connected Photovoltaic Power Generation System

Aiming at the solar photovoltaic characteristics and the lower transformation efficiency problem in grid-connected photovoltaic power generation, a maximum power point tracking (MPPT) algorithm is put forward.According to the changes of amplitude and frequency of power-grid voltage, the proposed algorithm can calculate the correction value of maximum power point, which will be stacked with the maximum power obtained by means of perturbation and observation method, and then the MPPT control is realized.Simulation experiment results present that, compared with the traditional MPPT method using perturbation observation, the proposed method can avoid misjudgment, guarantee the shorter time for maximum power point tracking, and reduce the shock around the maximum power point.Moreover, it can effectively suppress the influences of instable factors on the maximum power point, and meet the optimal power point for stable operation of power grid.