Optimization of series-parallel connection of PV array to mitigate negative influence of partial shading conditions

Abstract

Rapid development in the photovoltaic systems demanding more and more efficient solutions, not only in micro-fabrication techniques but in energy extraction methods as well. In recent decades large number of Maximum Power Point Tracking algorithms with different complexity accompanied by the capability to efficiently locate global maximum under partial shading were developed. However, a deeper look at the problem reveals that to further enhance the performance of the PV system under non-uniform irradiance there is a need for hardware intervention to the interconnect, or in other words adjustments to the panel configuration. In this paper, we propose a simple technique for optimizing the electrical scheme of the solar panel (connection of individual cells) by using a simple algorithm which disperses shadow across all structure. The method allows to mitigate partial shading effect on solar panels of any size and shape, therefore rise efficiency of energy extraction. Thus static optimization of the PV panel configuration disperses partial shading across all structure and ensures more synchronous functioning of the PV cells. The resulting structure not only capable of extracting more available power but, straighten ups power curve to loosen requirements for MPPT computations.