Abstract
To extract maximum output from a solar photovoltaic (PV) array, various maximum power point tracking (MPPT) algorithms have been proposed in the literature. Among all the MPPT algorithms, Perturb and Observe (P&O) algorithm is most commonly used because it is simple and easy to implement. But, the conventional P&O algorithm has some limitations. It has poor efficiency at steady state as the operating point oscillates around the maximum power point (MPP) and it shows poor dynamic response if a sudden change in atmospheric condition takes place. Also, for single phase Grid connected PV system, dc-link voltage contains a second harmonic ripple. This voltage ripple causes steady state oscillations in PV voltage. To overcome all these limitations, a modified P& O algorithm has been proposed in this paper. It shows improved steady state response and dynamic response during any change in atmospheric condition. The performance of the proposed scheme is verified using MATLAB/SIMULINK based environment.
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