Technical Brief

Performance Enhancement of Partially Shaded Solar Photovoltaic Array Using Grouping Technique

[+] Author and Article Information
S. Malathy

Department of Electrical and Electronics Engineering,
SSN College of Engineering,
Rajiv Gandhi Salai,
Kalavakkam, Tamil Nadu 603 110, India
e-mail: malathys@ssn.edu.in

R. Ramaprabha

Department of Electrical and Electronics Engineering,
SSN College of Engineering,
Rajiv Gandhi Salai,
Kalavakkam, Tamil Nadu 603 110, India
e-mail: ramaprabhar@ssn.edu.in

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 19, 2014; final manuscript received December 29, 2014; published online January 27, 2015. Assoc. Editor: Santiago Silvestre.

J. Sol. Energy Eng 137(3), 034505 (Jun 01, 2015) (5 pages) Paper No: SOL-14-1209; doi: 10.1115/1.4029540 History: Received July 19, 2014; Revised December 29, 2014; Online January 27, 2015

The energy yield of the photovoltaic (PV) system is reduced to a greater extent under shaded conditions. Reconfiguration and repositioning techniques demand more number of sensors, switches, and an efficient control algorithm and are well suited for rapidly changing shade conditions. However, for fixed shading that is common in urban rooftop installations, where the shading is partial and usually caused by nearby structures, a simple, yet effective technique is necessary. This paper addresses the issue by grouping the panels based on shade intensity and the merits of asymmetrical multilevel inverter (AMLI) are utilized as the working voltage of each group is different.

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Fig. 1

Electrical characteristics (a) at different irradiations and (b) for various configurations at G = 1000 W/m 2

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Fig. 2

Characteristics under shaded conditions (a) without bypass diode and (b) with bypass diode

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Fig. 3

(a) Shade distribution, (b) grouping-1, (c) grouping-2, and (d) grouping-3

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Fig. 4

Characteristics of (a) grouping-1, (b) grouping-2, and (c) grouping-3

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Fig. 5

(a) AMLI and (b) output voltage waveform

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Fig. 6

(a) Switching angles for different depths of modulation, (b) THD versus ma, (c) simulated output voltage, and (d) harmonic profile

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Fig. 7

(a) Output voltage and (b) frequency spectrum



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