Solar cells under uniform and non-uniform illumination show different features.The results of Matlab Simulink simulations of solar cell under uniform and non-uniform illumination are presented respectively. And MPPT technology is analysized on the basis of the characteristic curve obtained. SAA(Simulate Anneal Arithmetic) is applied in incremental conductance to improve the tracking precision of the MPPT under non-uniform illumination. Finally

a simulation of SAA is conducted and compared to the result of the simulation using incremental conductance and global MPPT. The results indicate that incremental conductance join with SAA can accurately track the maximum power point of PV array under nonuniform illumination

stabilizing the MPPT control.