As is known by the photovoltaic properties of photovoltaic cell

with the change of light intensity and ambient temperature

the maximum power point of photovohaic systems has changed. In order to be capable of real- time monitoring and tracking of the maximum power point of photovoltaic systems

an method of improved sliding mode control is used to track the maximum power point. Based on the traditional sliding mode control

this method is designed by adding integral operation into the sliding mode surface

combining with exponential reaching law and the equivalent control. Finally

through the simulation we can find that

compared to traditional variable structure control

which reduces the steady-state error

make the system more stable

meanwhile it also has accelerated the tracking speed and shortened the tracking time by 0. 025 s.