Abstract: A nonlinear variation of the output power of photovoltaic cells with the load is obvious as the ambient temperature and light intensity change.How to find the maximum power point rapidly and exactly is becoming a research hotspot.This article employs the disturbance observation method to study the maximum power point,and photovoltaic array model is established in the Matlab with an improved MPPT method.Comparison with the fixed step disturbance observation method by simulation shows that the improved MPPT method has significantly fewer iteration times with quicker determination of the maximum power point.

Key words: solar energy;characteristic of photovoltaic battery;MPPT