Sliding Mode MPPT Based Control For a Solar Photovoltaic system

---------------------------------------------------------------------***--------------------------------------------------------------------Abstract –This paper proposes the controlling of the photovoltaic (PV) system by sliding mode control(SMC). Here, open circuit voltage MPPT technique is used to track maximum power point. There is a difficulty in tracking the maximum power point of the photovoltaic system due to nonlinearity of the I-V characteristics which is dependent of the temperature and irradiation conditions. The system involves a PV panel, dc/dc boost converter, a load and a control that generates PWM signal that goes to the boost converter. The open circuit voltage based MPPT uses open circuit voltage to calculate maximum power output voltage. The input to the sliding mode controller is the change in reference voltage and PV voltage and the output of the SMC is the change in duty ratio. The SMC is used to track the maximum power point by changing the duty cycle of the boost converter. Using this method, the output power of PV array directly controls the dc/dc converter, hence reduces the complexity of the system. The advantages of this method are high efficiency, best accuracy, good convergence speed, and is robust to weather condition changes. The effectiveness of proposed sliding mode control can be validated using simulation