Adaptive MPPT based Approach for Single-phase AC Photovoltaic Modules under Partial Shading Conditions

In this paper, an efficient topology for multiple PV Module standalone PV systems under partial shading conditions is proposed. The efficiency of the proposed system is enhanced by a evolutionary hybrid approach MPPT algorithm. In this approach the changes due to Irradiance and Perturb of the MPPT algorithm are separated to address the problem of wrong tracking direction under fast varying environmental conditions, a faster convergence is achieved by a variable step size and a oscillations at maximum peak point are reduced by smaller step size and controlling the unnecessary switching over by positive and negative thresholds. A brief of previous work on inverter technologies for connecting photovoltaic (PV) modules to a single-phase AC appliance is given. The various inverter topologies are compared, and evaluated against demands, lifetime, component ratings, and cost. Finally, the simulation results of MATLAB and PSIM have been compared with earlier methods. Improvements in the performance and tracking effect have been obtained.