A Comparative Study on Different

Photovoltaic Array Topologies under

Partial Shading Conditions

Moein Jazayeri, Sener Uysal, Kian Jazayeri Electrical and Electronic Eng. Dept., Eastern Mediterranean University

Famagusta, North Cyprus, Turkey

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Introduction The study proposes comparative analyses on the performances of

different PV array topologies under various irradiance conditions.

Appropriate configuration of PV systems is considered to improve the

performance under various environmental conditions.

“Series-Parallel (SP)”, “Bridge-Link (BL)” and “Total-Cross-Tied

(TCT)” configurations are considered.

Simulation models for PV array topologies are constructed in

Matlab/SIMULNIK and the performances are analyzed with and

without application of bypass diodes.

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Modeling & Simulation of the PV Array

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“Simulated I-V and P-V Curves for

SOLAREX MSX-60 Solar Module”

The proposed PV array includes 36

PV modules in a 6x6 array

configuration.

One-Diode mathematical model of a

solar cell is utilized for modeling

purposes.

Modeling & Simulation of the PV Array

“Simulation model for a 6x6 Series-Parallel PV Array”

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Modeling & Simulation of the PV Array

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“Simulation model for a 6x6 Total-Cross-Tied PV Array”

Modeling & Simulation of the PV Array

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“Simulation model for a 6x6 Bridge-Link PV Array”

Modeling & Simulation of Partial Shading Effects

Pattern

No. Shading Scenario No. of Fully

Shaded

Modules

No. of Partial

Shaded

Modules

No. of Fully

Illuminated

Modules

1 The cloud center locates on the

corner of the array 4 12 20

2 The cloud enters the array from the

bottom (Row-wise shading) 12 12 12

3 The cloud enters the array from the

left side (Column-wise shading) 12 12 12

4 The array enters the array from the

top (Row-wise shading) 12 12 12

5 The cloud center covers 4 modules

at the middle of the array 4 12 20

6 The 4 modules at the middle are

fully illuminated 20 12 4

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Simulation Results

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“Array P-V Characteristics

for Column-Wise shading”

“Array P-V Characteristics

for Row-Wise shading”

Simulation Results

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Simulation Results

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Conclusions

Without Bypass Diodes With Bypass Diodes

BL TCT BL TCT

Maximum

Improvement in Pmax

9% 10% 2.8% 5.84%

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Different PV array topologies show similar performances

under identical illumination.

TCT configuration outperforms SP and BL interconnections

under partial shading conditions.

Maximum improvement with bypass diodes: 93.41% (Row-

Wise Shading).

Thanks for your patience and attention …

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