Abstract
Effect of partial shading on PV modules is simulated. Three standard configurations of PV array consisting of series-parallel (SP), bridge-linked (BL), and total cross-tied (TCT) are studied. Nine PV panels are arranged in 3x3 array. The suitable solar radiation level to start reconfiguring the PV array according to shading pattern is investigated. Partial shading of 1, 2 and 4 panels in 9 are simulated. From the simulation results, it is found that the reconfiguration of PV arrays may not increase the power output higher than 5% when there are shaded greater than 50% of the total area. Therefore, it is unnecessary to reconfigure the PV array. Conversely, if shaded area is less than 50% reconfiguring can improve the power output. Moreover, different shading patterns provide different power outputs even if the shaded areas are equal and the points to start reconfiguring the array are different for various shading patterns.
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