Optimal Su-Do-Ku based interconnection scheme for increased power output from PV array under partial shading conditions

doi:10.1007/s11708-015-0350-1

Front. Energy

2015, Vol. 9

Issue (2) : 199-210 https://doi.org/10.1007/s11708-015-0350-1

RESEARCH ARTICLE

Optimal Su-Do-Ku based interconnection scheme for increased power output from PV array under partial shading conditions

P. SRINIVASA RAO, P. DINESH, G. SARAVANA ILANGO(

), C. NAGAMANI

Department of Electrical and Electronics Engineering, National Institute of Technology, Tiruchirappalli 620015, India

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Abstract

Partial shading is a common phenomenon in PV arrays. They drastically reduce the power output because of mismatch losses, which are reliant on the shape of the shade as well as the locations of shaded panels in the array. The power output can be improved by distributing the shade over various rows to maximize the current entering the node. A Su-Do-Ku configuration can be used to rearrange the physical locations of the PV modules in a total cross tied PV array with the electrical connections left unchanged. However, this arrangement increases the length of the wire required to interconnect the panels thus increasing the line losses. In this paper, an improved Su-Do-Ku arrangement that reduces the length of the wire required for the connection is proposed. The system is designed and simulated in a Matlab/Simulink environment for various shading patterns and the efficacies of various arrangements are compared. The results prove that the power output is higher in the proposed improved Su-Do-Ku reconfiguration technique compared to the earlier proposed Su-Do-Ku technique.

Keywords array configuration mismatch losses partial shading line losses Su-Do-Ku arrangement

Corresponding Author(s): G. SARAVANA ILANGO

Just Accepted Date: 02 February 2015 Online First Date: 16 March 2015 Issue Date: 29 May 2015

Cite this article:

P. SRINIVASA RAO,P. DINESH,G. SARAVANA ILANGO, et al. Optimal Su-Do-Ku based interconnection scheme for increased power output from PV array under partial shading conditions[J]. Front. Energy, 2015, 9(2): 199-210.

URL:

https://academic.hep.com.cn/fie/EN/10.1007/s11708-015-0350-1
https://academic.hep.com.cn/fie/EN/Y2015/V9/I2/199

Fig.1 Equivalent circuit of a PV cell

Tab.1 PV specifications at 1000W/m², 25°C

Fig.2 PV array configuration

Fig.3 Su-Do-Ku configurations

Fig.4 Flowchart for applying the proposed technique

Fig.5 Wiring diagram of modules in 3rd column

Fig.6 Equivalent circuit diagram

Fig.7 Different shading conditions

Fig.8 Actual shade, shade dispersion, and PV characteristics for Case 1

Fig.9 Actual shade, shade dispersion, and PV characteristics for Case 2

Fig.10 Actual shade, shade dispersion, and PV characteristics for Case 3

Fig.11 Actual shade, shade dispersion, and PV characteristics for Case 4

Tab.2 Summary of power generated in various arrangements

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[1]	Namani RAKESH,T. Venkata MADHAVARAM. Performance enhancement of partially shaded solar PV array using novel shade dispersion technique[J]. Front. Energy, 2016, 10(2): 227-239.

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