Output Voltage Sensor based Maximum Power Point Tracking for PV system using SEPIC

Abstract

Maximum power point tracking (MPPT) algorithm with a single output voltage sensor for a photovoltaic (PV) system is presented in this paper. The MPPT algorithm is developed by considering the slope ( dVo dD ) of Vo − D characteristics. In this method only a voltage divider circuit is used to sense the converter output voltage (Vo). The steady state behavior, tracking performance for a change in insolation and for a load variation with the output voltage sensor based MPPT algorithm are addressed through experimental results to determine the tracking efficiency. The duty cycle (D) is generated directly without any proportional-integral control loop to simplify the control circuit. Single ended primary inductance converter (SEPIC) is used for experimental validation of the algorithm with microcontroller.