Reconfiguration of photo voltaic arrays under partial shading conditions

Abstract

Photovoltaic (PV) array are prone to huge amounts of power deficit due to partial shading on the array. The shading pattern of a solar panel if examined helps to improve the efficiency of a Solar panel. The output of the module declines when shaded by nearby buildings, tree branches or module dust. The output declines proportionally to the amount of shading. Shading on a single module causes the current in the string to fall. Due to partial shading the arrays characteristics exhibits multiple peaks. This paper analyzes the various configurations under partial shading conditions. The performance of Series Parallel (SP), Honey Comb (HC), Bridge link (BL), Total Cross Tie (TCT) with and without bypass diode are compared for 6×6 photovoltaic array using MATLAB/Simulink. This paper also propounds a method to configure the modules to enhance the power output of the PV system. The PV array is positioned by “Number Place” Method. This method minimize the effect of shading and also lessen the peaks occurs in different configuration with bypass diodes connected.