SEPIC converter based Photovoltaic system with Particle swarm Optimization MPPT

This Paper presents Maximum Power Point Tracking (MPPT) of Photovoltaic Array under partial shading condition. The power available at the output of photovoltaic cells keeps changing with solar insolation and ambient temperature because photovoltaic cells exhibit a nonlinear current voltage characteristic. A good number of publications report on different MPPT techniques for PV system most of the existing schemes are unable to extract maximum power from the PV array under these conditions. This paper proposes an algorithm to track the global power peak under partially shaded conditions. The Particle swarm optimization algorithm is based on several critical observations made out of an extensive study of the PV characteristics and the behavior of the global and local peaks under partially shaded conditions. All the observations and conclusions, including results are presented.