Photovoltaic array MPPT based on improved perturbation observation method

Perturbation observation method is most widely used which exists tracking speed and steady state accuracy of the inconsistent problems and external environment of mutations leading to longer tracking problem during the process of maximum power point tracking (MPPT). An improved variable step perturbation strategy is proposed. The power prediction method is used to make the direction of the disturbance, then combines with the variable step strategy to track the maximum power point. The system modeling and simulation is built in Matlab/Simulink, the result shows that the method can effectively improve the speed of tracking and steady accuracy, has strong anti-interference ability to the light intensity mutation.