Photovoltaic Array Maximum Power Point Tracking sliding mode control method and system

The present invention is a photovoltaic array maximum power point tracking sliding mode control method and system. Maximum power point tracking control method of the present method to obtain the switch control signal based on the output voltage and current of the photovoltaic array is detailed below: Step Ⅰ voltage and current signals moving average filter pretreated to reduce interference to the sampling measurement maximum power point tracking control affect the accuracy while increasing speed maximum power point tracking. Step Ⅱ incomplete partial differential value is calculated based on a function S2 of the sliding mode, the step of switching control signals Ⅲ hysteresis processing, in accordance with the relationship δ value and the set value S2, the switch 0 or 1 to give a control signal u. The system memory within the microcontroller Incomplete sliding surface function calculating partial differentiation program and hysteresis processing program to adjust the control to achieve DC-DC converting circuit equivalent load resistance so as to match the photovoltaic array, fast, accurate tracking photovoltaic array of maximum power, simple structure, low cost, easy to implement.