Abstract
Partial shading has a negative impact on the performance parameters of a Solar Photovoltaic (PV) array, because it shades certain panels while leaving others un-shaded. This article focuses on modeling, comparing and performance assessment of 6×6, 6×5 and 5×6 size shadowed solar PV arrays under different partial shading cases in the MATLAB/ Simulink software. For this purpose, the simulation of series-parallel (SP), Total-Cross-Tied (TCT) and proposed shade dispersion based TCT (SD-TCT) type of array configurations was carried out under few shading cases. The proposed SD-TCT was designed using the shades dispersion technique, which is based on a number logic approach. In this technique, in order to effectively remove the row-current mismatches in the TCT PV array configuration, the shaded and un-shaded modules in an array were re-arranged, so that the shading on modules expands across the whole array. The physical placement of the TCT array modules has been reordered in accordance with the proposed number logic pattern exclusive of altering the electrical links among the panels. The simulation results showed that the performance of the SD-TCT type was superior to that of conventional array configurations.
Highlights
The power generated by solar photovoltaic (PV) plants varies with the temperature and irradiance of the PV module
Performance Analysis To evaluate the performance of 6×6, 6×5 and 5×6 array size SP, TCT and proposed shade dispersion based TCT (SD-TCT) arrangements, three factors including Global Maximum Power Point (GMPP), mismatch losses (ML), % power improvement in SD-TCT under different shading cases are considered in this paper, which are displayed in Figures 7, 9 and 10, respectively
The ML exists between the parameters of the PV module under shading conditions (SC), as the modules obtain different intensities of solar radiation
Summary
The power generated by solar photovoltaic (PV) plants varies with the temperature and irradiance of the PV module. Shades, such as shadows of surrounding trees, shifting clouds and dust deposition on modules, directly influence the cell temperature and radiation level of the PV system. In the shading conditions (SC), the power generated by the array is reduced and results in the output P-V curves to have multiple peaks i.e., LMPP (Local maximum power point) and GMPP (Global maximum power point). Several MPPT tracking methods for LMPP and GMPP of the solar PV array configurations have been proposed in the literature. One solution for reducing losses from malfunction and shading is PV array configurations. In the literature of [1,2,3,4,5], a brief comparison study among S, P, SP, TCT, and
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