Maximum power point tracking parameter selection for higher order converters used in photovoltaic applications

Photovoltaic array needs an intermediate maximum power point trackers as their V-I characteristics are non-linear. Successful power tracking depends on the converter and its tracking parameters. The purpose of this investigation is to introduce a procedure for selection of the tracking parameters. To demonstrate the proposed approach a fourth order buck converter, belongs to higher order family, is chosen for photovoltaic power tracking applications. This topology essentially belongs to buck family and also results in improved performance as compared to conventional buck converter. Mathematical models of the proposed converter are formulated and then boundary conditions, under which the converter able to track maximum power, are obtained. The total combined photovoltaic power tracking scheme is simulated in PSIM and then power tracking performance characteristics are generated. The proposed MPPT parameters selection procedure is validated through experimental results.