ABSTRACT
Photovoltaic (PV) systems usually adopt field maximum power point tracking, that is, the tracking of the maximum power point (MPP) of the power vs. voltage characteristic of the whole field composed by paralleled PV strings. This chapter explains the AC analysis of an array constituted by a given number of self-controlled PV modules (SCPVMs). The aim is to study dynamic behavior and stability of a whole array of SCPVMs. The chapter derives a model for an array of SCPVMs operating under mismatched irradiances. Local stability can be studied by deriving the loop transfer function of each SCPVM as part of the string under study. The approach described allows us to effectively analyze modules interaction and stability of a string of SCPVMs provided that the dynamics of the maximum power point tracking block in each SCPVM is slow enough for the closed-loop DC/DC converter to reach steady-state operation after each perturbation.
