Impact of Uneven Shading by Neighboring Buildings and Clouds on the Conventional and Hybrid Configurations of Roof-Top PV Arrays

Satpathy, Priya Ranjan; Babu, Thanikanti Sudhakar; Shanmugam, Sathish Kumar; Popavath, Lakshman Naik; Alhelou, Hassan Haes

doi:10.1109/access.2021.3118357

Cited by 26 publications

(3 citation statements)

References 33 publications

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“…Various simulations and experimental investigations on the power generation capability of these configurations have been carried out that revealed the excellent performance of TCT during partial shading [28]. However, numerous studies proved the inefficiency of these array configurations in reducing the power loss during partial shading which raised a serious question of reliability and effectiveness [29].…”

Section: Introductionmentioning

confidence: 99%

A zero switch and sensorless reconfiguration approach for sustainable operation of roof‐top photovoltaic system during partial shading

Aljafari

Satpathy

Babu

et al. 2023

IET Renewable Power Gen

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Photovoltaic (PV) roof‐top systems in real‐time environments are highly susceptible to the commonly occurring scenario of partial shading that occurs due to unavoidable conditions such as the shadow of buildings and trees. The occurrence of partial shading creates a serious mismatch among the modules of PV arrays that results in severe unexpected power losses in PV arrays. The conventional and hybrid configurations used for loss mitigation in PV arrays are sometimes unreliable and incapable of generating higher power during partial shading. Hence, this paper focuses on the development of a simple and effective technique for the reliable operation of PV arrays and loss reduction during the occurrence of partial shading. The technique is applicable to arbitrary array sizes having no dynamic parts and requires no switches and sensors for implementation to enhance the performance and operation of the system. The performance and reliability of the technique have been investigated under MATLAB simulation and real‐time scenarios by comparing it with various configurations under shading. The investigation reveals a higher power output by the proposed technique with an average conversion efficiency of higher than 90% and power enhancement of 19.07% than other configurations.

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Section: Introductionmentioning

confidence: 99%

A zero switch and sensorless reconfiguration approach for sustainable operation of roof‐top photovoltaic system during partial shading

Aljafari

Satpathy

Babu

et al. 2023

IET Renewable Power Gen

Self Cite

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“…Despite its superior performance compared to conventional configurations, the CB technique has the following main shortcomings: (a) Incompetent shade dispersal over the entire PV array and (b) incompatibility with the un‐symmetrical PV array size. The effect of irregular shading by nearby buildings and clouds on conventional and hybrid roof‐top PV array configurations is investigated in Satpathy et al 27 Recently, a modified Sudoku puzzle‐based fixed reconfiguration approach is proposed in Rajani and Ramesh 28 to alleviate the shading losses; however, this technique cannot be scalable to all array sizes.…”

Section: Introductionmentioning

confidence: 99%

A novel scan pattern for reconfiguration of partially shaded photovoltaic arrays for maximum power extraction

Raj

Naik

2022

Circuit Theory & Apps

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Reconfiguration plays an indispensable role in augmenting the output of the photovoltaic (PV) array under partial shading conditions. Various reconfiguration schemes have been proposed in the literature to disperse the shade in partially shaded PV arrays. Nevertheless, most of these schemes can be employed only for less‐rated arrays, are not compatible with all array sizes, fails in effective shade dispersion over the entire array, and so forth. To overcome these shortcomings, a calligraphy‐based diagonal scan pattern is proposed to reconfigure the PV array to improve the row currents of the PV array thereby reducing the mismatch between them. The superiority of the proposed scheme is examined by comparing it with conventional Series‐Parallel, Total‐Cross‐Tied, and the existing image processing based‐Chaotic Baker Map, Odd‐Even, and Odd‐Even‐Prime configurations. Besides, the system is extensively studied for various symmetrical 9 × 9, 8 × 8, 4 × 4, and unsymmetrical 8 × 6 PV arrays under 34 distinct shading cases with various performance indices. An experimental laboratory prototype model of a 4 × 4 PV array reconfiguration system is developed and studied under distinct shading conditions. Subsequently, an inclusive economic analysis is also conducted, and it is noted that there is a notable enhancement in electricity units and revenue generation by executing the proposed reconfiguration scheme.

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“…Most simulation and experimental analyses show the higher effectiveness of TCT [20], whereas some studies show that configurations have the least effect under shading caused by clouds [21]. Subsequently, considering the redundancy and complexities of the wires, various configurations based on hybridization of the conventional configurations were proposed, tested, and proved to be more efficient than SP, BL and HC [22]. Further modification resulted in the introduction of array reconfiguration, a configuration performed under two mechanisms, i.e., dynamic electrical reconnection or static relocation of modules connected to the array with the main aim of dispersing the shading effect throughout the array to reduce current differences between rows [23].…”

Section: Introductionmentioning

confidence: 99%

Reliability Enhancement of Photovoltaic Systems under Partial Shading through a Two-Step Module Placement Approach

Aljafari

Satpathy

Madeti³

et al. 2022

Energies

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Partial shading has a negative impact on photovoltaic systems by forcing the connected modules to generate lower power, creating severe unexpected power losses. To resolve this issue, numerous solutions have been proposed, among which configuration modification has recently attracted a greater audience. The preliminary approach to module reconfiguration was based on the alteration of electrical connections through switches, which introduces lag due to the large number of switches and sensors, complex algorithms, and impractical application. Hence, static techniques are considered to be a cost-effective, low-complexity and easy-to-adopt solution for efficiently reducing the losses due to shading. Hence, this paper proposes a two-step module replacement approach that is validated under multiple partial shading conditions, and the performance is compared with various conventional and hybrid configurations and a static electrical reconfiguration technique using mathematical analysis, comparative parameters and power curves analysis. The validation was performed using the MATLAB platform for two system sizes—6 × 6 and 18 × 3—proving its applicability for arbitrary system sizes. On the basis of the depth investigation, an average power increase of 17.49%, 14.47%, and 14.12% for the two-step approach compared to the conventional, hybrid and electrical reconfiguration was observed in the partial shading cases considered.

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Impact of Uneven Shading by Neighboring Buildings and Clouds on the Conventional and Hybrid Configurations of Roof-Top PV Arrays

Cited by 26 publications

References 33 publications

A zero switch and sensorless reconfiguration approach for sustainable operation of roof‐top photovoltaic system during partial shading

A zero switch and sensorless reconfiguration approach for sustainable operation of roof‐top photovoltaic system during partial shading

A novel scan pattern for reconfiguration of partially shaded photovoltaic arrays for maximum power extraction

Reliability Enhancement of Photovoltaic Systems under Partial Shading through a Two-Step Module Placement Approach

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