Variable step size Perturb and observe MPPT algorithm for standalone solar photovoltaic system

The maximum power obtained from a solar photovoltaic system varies due to the variation in the atmospheric condition. Maximum Power Point Tracking (MPPT) controller is implemented to track the maximum power with respect to the changes in the weather conditions to efficiently operate the solar Photovoltaic (PV) system. In this paper, a comparative study between different P&O algorithms such as conventional Perturbation & Observation (P&O) MPPT and variable step size Perturb & Observe (VSS P&O) MPPT are presented. The performance study of standalone solar PV system is carried out under various weather conditions with different MPPT controller. DC-DC boost converter is adopted as power conditioning unit.