Abstrakt

Power Optimization Strategy of a Cascaded Dc/Dc Converter Topologies for Grid Connected Photo Voltaic System

Ganga. M

solar energy is present throughout the day but the solar irradiation levels vary due to sun intensity and unpredictable shadows cast by clouds, birds, trees, etc. The common inherent drawback of photovoltaic systems is their intermittent natures that make them unreliable. Moreover, most PV modules are designed for stand-alone applications that have output voltage adapted to lead batteries. Indeed, this historical sizing of PV modules can be discussed in the case of grid-connected systems. In this paper, a cascaded dc/dc converter based on boost chopper is proposed. The global optimum of cascaded connections of PV modules is generally equivalent with operating all the modules at maximum power point tracking (MPPT). This topology will be optimized to maximize the efficiency or minimize the volume. The originality of this optimization is that the converter’s parameters and the arrangement of the PV cells are variable parameters. Indeed, the optimization is done on the entire system. The optimization uses a maximum power point tracking (MPPT) algorithm. Finally, optimized topologies connected to several PV are evaluated at different situations of typical shadows.