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research-article

A new PV arrays fixed reconfiguration method for reducing effects of one and two-sided mutual shading

[+] Author and Article Information
Majid Horoufiany

Shahid Rajaee Teacher Training University, Tehran, Iran
m.horoufiany@srttu.edu

Reza Ghandehari

Shahid Rajaee Teacher Training University, Tehran, Iran
R_ghandhari@srttu.edu

1Corresponding author.

ASME doi:10.1115/1.4041930 History: Received July 17, 2017; Revised November 03, 2018

Abstract

Low distance between PV arrays can lead to the mutual shading between them, which can lead to the significant power losses. These shadows can be usually seen in PV plants with limited land such as buildings' roof. In this paper, a PV arrays fixed reconfiguration method is presented for reducing effects of one and two-sided mutual shadings in Total Cross Tied (TCT) arrangements. Two-sided mutual shading appears when the array is shaded in two separate areas, while in one-sided mutual shading, there is only one shaded part in the array. In this method, physical locations of modules are rearranged without changing the electrical interconnections. For reducing effects of these shading, their important features are initially explained. Then the optimal array rearrangement is determined by considering all possible mutual shadows. In mutual shading conditions, the obtained arrangement is capable to equally disperse shaded modules in different array rows, while it is no need to any additional switches or sensors. Due to this equal dispersion, there is no need to use the bypass diodes for maximum power extraction in this condition. The simulation results show the effectiveness of this method.

Copyright (c) 2018 by ASME
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