A Comparative Study of MPPT for PV System Based on Modified Perturbation & Observation Method

The Perturbation and Observation (P&O) algorithm is one of the best tracking technologies for maximum power practically possible for its flexibility and ease of execution in low-fee devices. The major challenges of the traditional P&O algorithm are energy waste in steady-state conditions and the dynamic performances are poor when the solar irradiance or temperature is changing suddenly. In the paper, a distinction between the variable-step scale, the two-step size and the traditional P&O is performed in order to play an important reference role for potential users of MPPT in PV systems. The results show how the two-step and variable-step have a better dynamical reaction and steady-state precision than the conventional P&O MPPT algorithm.