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A novel PV array configuration for enhancing maximum power from PV array

Clean Energy 2022年第6期6卷 817-826页

作者： Dharani Kumar Narne T.A.Ramesh Kumar Rama Koteswara Rao Alla Department of Electrical Engineering Annamalai UniversityAnnamalai NagarChidambaramTamilnadu-608002India Department of Electrical and Electronics Engineering RVR&JC College of EngineeringGunturAndhra Pradesh-522019India

Partial shading conditions(PSC)are unavoidable and are the main reason for the reduction in power from a photovoltaic(PV)*** proper arrangement,the impact of PSC can be somewhat *** are distinct types of configurations,including series,parallel,series-parallel(SP),honeycomb,total cross-tied(TCT),*** article presents a novel SP-TCT configuration to maximize output power from PV panels under different shading *** proposed configuration performance has been examined considering a 4×4 PV array under long-narrow and long-wide,short-narrow,short-wide and uniform shading *** results of the proposed configurations are compared with existing configurations in terms of performance measures such as maximum power,fill factor,efficiency and mismatch *** all the cases,performance of the proposed configuration is nearer to the TCT configuration *** percentage improvement in terms of efficiency for the proposed novel SP-TCT configuration and TCT configuration is nearly 1.6%compared to other methods.

关键词： maximum power shading patterns PV array efficiency

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Analysis of Strength Training in the Training of Shot-Putters

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Journal of Contemporary Educational Research 2024年第6期8卷 89-95页

作者： Heng Wang International College Krirk UniversityKrung Thep Maha Nakhon 10220Thailand

The shot put is a sport that requires very high explosive power and precise *** training occupies the core position in the training of shot-putters,which can not only improve the throwing distance of athletes but also enhance their competitive state and prevent sports *** purpose of this paper is to analyze the principles,classification,methods,and specific exercises of strength training in the training of shot-putters,in order to provide scientific training guidance for shot-putters.

关键词： Shot-put movement Strength training Explosive power maximum power Functional training

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Comparative Study of the Effect of Shading Rate on the Electrical Parameters of CIGS and CdTe/CdS Solar Modules

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World Journal of Condensed Matter Physics 2022年第4期12卷 39-45页

作者： El Hadji Abdoulaye Niass Oumar Absatou Niasse Nacire Mbengue Zakaria Makir Zouhair Sofiani Bassirou Ba Laboratory of the Semiconductors and Solar Energies (LASES) Physical Department Science Faculty University Cheikh Anta Diop of Dakar Dakar Senegal Laboratory of Materials Energy and System Control (LMECS) Physical Department Science Faculty of Mohammadia University Hassan II of Casablanca Casablanca Morocco

In this paper, a comparative study of the maximum power on the shading rate on the maximum power of thin film PV modules. Thus two thin film PV modules of type Copper indium gallium selenide, CIGS, of 90W power and a CdTe (Cadmium telluride)/CdS (Cadmium sulfide) module, of maximum power 75 W. These modules, reference SN-CIGS90 and CX3 75 were tested under the conditions of the installation site to ensure their proper functioning and to determine the initial values of electrical parameters before shading. The results obtained are as follows: for the CIGS: Pm (80.717 W);Vco (23.06 V), Icc (3.5 A) and for the CdTe:Pm (54.914 W);Vco (35.52 V), Icc (1.546 A). After this characterization test, the modules are exposed to real operating conditions at the Center for Study and Research on the renewable energy (CERER), Cheikh Anta Diop University in Dakar. Four types of shading are performed on each module with the same mask: partial shading at 25%, 50%, 75% and complete shading at 100%. The comparison of the variation rates obtained on the experimental values of the 4 types of shading carried out on each module, shows that, the phenomenon of shading constitutes an environmental factor which influences negatively the maximum power of the thin film PV modules. But this reduction depends on the surface of the shaded module, the nature of the mask but also the technology used. Indeed, for a shading of 25% of the surface of the two modules, we note a reduction of 21.32% of power for the CIGS, against 40.53% for the CdTe/CdS, that is to say a difference which approaches 20%.

关键词： CIGS CdTe/CdS Shading Rate maximum power Mask

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