Abstract
High voltage gain step-up dc-dc converters have received substantial attention recently due to their applicability in renewable energy technologies. In this paper, a study of a four-cell high voltage gain boost dc-dc converter performing maximum power point tracking from a PV source is presented. First, mathematical modeling using the large-signal switched and averaged models are addressed. The s- domain small-signal model is then derived from the linearized averaged model. Using the resulting control-to-output transfer function, controller design is addressed after validating the small-signal model by comparing its results from those obtained using the open-loop switched model of the converter supplied by a nonlinear PV source. Based on the validated small-signal model of the system, the controller design is addressed in the frequency domain. Finally, numerical simulation are used to evaluate the performances of the converter when used in PV applications under different weather and parameter mismatch conditions.