Avoidance of Drift due to change in Irradiation in Photovoltaic System with Modified Perturb and Observe MPPT Algorithm

Abstract

Efficiency of PV system is depending on maximum power point tracking (MPPT). It will help
to extract maximum power from PV system. Perturb and Observe (P&O) maximum power
point tracking algorithm is adopted everywhere, due to its simplicity and economic point of
view. But in case of rapid change in insolation (G), it suffers from drift in tracking maximum
power point (MPP). It is the main demerit of the P&O MPPT algorithm. This may happen
due to confusion of whether power get increases due to perturbation or change in
insolation(G). The drift effect is severe in case of a rapid increases in irradiations. This
technique proposed in this study leads to avoid drift in tracking maximum power point
(MPP). SEPIC converter are proposed with direct duty ratio control technique for free from
drift in P&O MPPT algorithm. MATLAB/Simulation modeling and analysis of a voltage and
power of PV system under rapid change in atmospheric condition with conventional P&O
algorithm. Study to drift phenomenon. The comparison between conventional P&O and
Modified P&O is shown in simulation and experimental results, which are showing changes
in duty cycle, that the proposed algorithm track maximum power in change in insolation (G).