Research Papers

A New Photovoltaic Arrays Fixed Reconfiguration Method for Reducing Effects of One- and Two-Sided Mutual Shading

[+] Author and Article Information
Majid Horoufiany

Department of Electrical Engineering,
Shahid Rajaee Teacher Training University,
Tehran 1678815811, Iran
e-mail: m.horoufiany@srttu.edu

Reza Ghandhari

Department of Electrical Engineering,
Shahid Rajaee Teacher Training University,
Tehran 1678815811, Iran
e-mail: R_ghandhari@srttu.edu

1Corresponding author.

Contributed by the Solar Energy Division of ASME for publication in the JOURNAL OF SOLAR ENERGY ENGINEERING: INCLUDING WIND ENERGY AND BUILDING ENERGY CONSERVATION. Manuscript received July 17, 2017; final manuscript received November 3, 2018; published online November 30, 2018. Assoc. Editor: Geoffrey T. Klise.

J. Sol. Energy Eng 141(3), 031013 (Nov 30, 2018) (7 pages) Paper No: SOL-17-1295; doi: 10.1115/1.4041930 History: Received July 17, 2017; Revised November 03, 2018

Low distance between photovoltaic (PV) arrays can lead to the mutual shading between them. This can lead to significant power losses. Usually, these shadows can be seen in PV plants with limited land such as buildings' roof. In this paper, a PV arrays fixed reconfiguration method is presented in order to reduce the 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 there is only one shaded part in the array in one-sided mutual shading. In this method, the physical locations of the modules are rearranged without changing the electrical interconnections. To reduce the effects of these shadings, first, their important features are explained. Then, the optimal array rearrangement is determined by considering all possible mutual shadows (MSHs). In mutual shading conditions, the obtained arrangement is capable of equally dispersing shaded modules in different array rows, while there is no need to add 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 validate the effectiveness of this method.

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Fig. 1

An example of fixed reconfiguration of 3 × 3 PVA

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Fig. 2

A rectangular MSH pattern

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Fig. 3

Mutual shading: one-sided mutual shading (array 1) and two-sided mutual shading (array 2)

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Fig. 4

Positon of ψiL and λiR in the array

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Fig. 5

The optimal arrangement that is obtained by the proposed approach

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Fig. 6

Shaded modules dispersion by the proposed scheme and PV curves with and without bypass diodes (w and w/o BD) for a (a) 2 × 4 MSH and (b) 1 × 4 MSH

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Fig. 7

Shaded modules dispersion by the proposed scheme and PV curves with and without bypass diodes (w and w/o BD) for two-sided MSH with i = 2, L = 1, R = 2

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Fig. 8

The PE% of the proposed scheme compared with the TCT arrangement for left and right-sided shadings (j: number of shaded columns; i: number of shaded rows)

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Fig. 9

The arrangements that are used for evaluation: (a) Futoshiki arrangement and (b) dynamic reconfiguration method in Ref. [35]



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