Performance Analysis of Interconnection and Differential Power Processing Techniques under Partial Shading Conditions

Evaldo Chagas Gouvêa (), Thais Santos Castro and Teófilo Miguel de Souza
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Evaldo Chagas Gouvêa: Department of Electrical Engineering, School of Engineering and Sciences, São Paulo State University (UNESP), Guaratinguetá 12516-410, Brazil
Thais Santos Castro: Department of Mechanical Engineering, School of Engineering and Sciences, São Paulo State University (UNESP), Guaratinguetá 12516-410, Brazil
Teófilo Miguel de Souza: Department of Electrical Engineering, School of Engineering and Sciences, São Paulo State University (UNESP), Guaratinguetá 12516-410, Brazil

Energies, 2024, vol. 17, issue 13, 1-19

Abstract: Partial shading conditions can cause low output power, hotspots, and a reduced lifespan in photovoltaic arrays. Interconnection (IC) and differential power processing (DPP) can be used to mitigate these effects. When individually applied to an array, these techniques can significantly increase the generated power. A few authors studied the combined use of these schemes under specific conditions such as large-scale arrays or a complex combination of several techniques, making it difficult to identify the individual contribution of each technique. Here, we aimed to determine whether the combined use of a switching-inductor DPP circuit and a total-cross-tied interconnection scheme presents better performance than each standalone technique, using a small-scale photovoltaic array. An array was tested using IC, DPP, and a combination of both techniques, and the array was subjected to 13 shading patterns and two irradiance levels. The performance in each case was assessed using maximum output power, performance ratio, mismatch power loss, and power enhancement indicators. The results showed that a standalone differential power processing circuit presents better performance than when it is combined with an interconnection. The DPP showed performance ratio values of up to 97%, mismatch power losses lower than 36.9%, and a power enhancement of up to 95.9%. The standalone interconnection shows the worst performance among the three techniques.

Keywords: interconnection; differential power processing; total-cross-tied scheme; switching-inductor converter; partial shading conditions (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2024
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (1)

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