Small signal modeling of diode in a parallel module subjected to partial shading

Abstract

Parallel connection of solar cells results in a very small difference in the internal p-n junction voltages when operated under partial shaded conditions. A small signal model is proposed in this paper to analyze the changes in the module parameters of parallel cells operating under this conditions. From the analysis it is observed that the maximum power for a parallel configured solar module is obtained at a fixed output resistance under varied shaded conditions. Circuit simulations validated the model implemented in Matlab.