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Evaluation of series-parallel-cross-tied PV array configuration performance with maximum power point tracking techniques under partial shading conditions

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Clean Energy 2023年第3期7卷 620-634页

作者： dharani kumar narne T.A.Ramesh kumar RamaKoteswaraRao Alla Department of Electrical Engineering Annamalai UniversityAnnamalai NagarChidambaramTamilnadu-608002India Department of Electrical and Electronics Engineering RVR&JC College of EngineeringGunturAndhra Pradesh-522019India

Tracking the maximum power point is a critical issue with solar *** power output of the solar panel varies due to variations in irradiance and *** irradiation due to partial shading conditions has a direct impact on the characteristics of photovoltaic(PV)*** build a diversity of maximum power point tracking algorithms in solar PV systems,this work focuses on perturb and observe,incremental conductance,and fuzzy logic control *** suggested fuzzy logic control method outperformed the conventional incremental conductance and perturb and observe algorithms with a collection of 49 *** paper presents a novel series-parallel-cross-tied PV array configuration with a developed fuzzy *** comment on the performance of a proposed system under various partial shading conditions,a series-parallel PV array configuration has been *** simulation result demonstrates that the fuzzy method has a percentage improvement in the global maximum power point tracking efficiency of 24.85%when compared to the perturb and observe method and a 65.5%improvement when compared to the incremental conductance method under long wide partial shading *** the case of the middle partial shading condition,the fuzzy method has a percentage improvement in the global maximum power point tracking efficiency of 12.4%compared to the perturb and observe method and a 60.7%improvement compared to the incremental conductance method.

关键词： Maximum Power Point Tracking Partial shading,Fuzzy Logic Controller Series Parallel-Cross Tied PV array configuration Series-Parallel PV array configuration

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

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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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Effect of deep cryogenic treatment on the microstructural,mechanical and ballistic properties of AA7075-T6 aluminum alloy

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Defence Technology（防务技术） 2023年第12期30卷 101-110页

作者： S.dharani kumar U.Magarajan Saurabh S kumar Rodríguez-Millan M Centre for Machining and Material Testing KPR Institute of Engineering and TechnologyCoimbatoreIndia Department of Mechanical Engineering Sri Venkateswara College of EngineeringChennaiIndia Scientific Officer Ballistic Research Centre&Testing RangeNational Forensic Sciences UniversityGandhi NagarIndia Department of Mechanical Engineering University Carlos Ⅲ of MadridLeganesMadridSpain

The study focused on investigating the effect of Deep Cryogenic Treatment(DCT)on the mechanical and ballistic properties of AA7075-T6 aluminum *** microstructure,microhardness,tensile strength,and impact strength of the Base Material(BM)and DCT-treated 7075 samples were analyzed through metallographic analysis and mechanical *** microstructure of the DCT-treated 7075 samples revealed fine grains and a distribution of secondary phase *** tensile strength,impact strength,and microhardness of DCT-treated samples increased by 7.41%,4%,and 9.68%,respectively,compared to the BM *** fractography analysis of the tensile samples showed cleavage facets,microvoids,and dimples in both the *** ballistic behavior of the BM and DCT target plates were studied by impacting hard steel core projectiles at a velocity of 750±10 m/*** target plates failed due to petaling and ductile hole enlargement,and the depth of penetration(DOP)of the DCT target was less than that of the BM target,indicating a higher ballistic *** post-ballistic microstructure examination of the target plates showed the formation of an Adiabatic Shear Band(ASB)without any *** was concluded that the DCT treatment improved the mechanical and ballistic properties of the aluminum alloy due to grain refinement and high dislocation density.

关键词： Deep cryogenic treatment AA7075-T6 Mechanical properties Ballistic Adiabatic shear band

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Effect of heat treatment conditions on ballistic behaviour of various zones of friction stir welded magnesium alloy joints

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Transactions of Nonferrous Metals Society of China 2021年第1期31卷 156-166页

作者： S.dharani kumar S.SURESH kumar Department of Mechanical Engineering Sri Eshwar College of EngineeringCoimbatore641202Tamil NaduIndia Department of Mechanical Engineering Sri Sivasubramaniya Nadar College of EngineeringChennai603110Tamil NaduIndia

Ballistic behaviour of different zones of post-weld heat-treated(PWHT)magnesium alloy(AZ31B)target against 7.62 mm×39 mm armour-piercing(AP)projectile with a striking velocity of(430±20)m/s was *** alloy(AZ31B)welded joints were prepared by using friction stir welding(FSW)process and subjected to different heat treatment *** microhardness values of non-heat-treated and heat-treated FSW joints were *** results indicated that PWHT process(250°C,1 h)has improved the microhardness of heat-treated FSW *** electron microscope(SEM)microstructure showed that heat treatment has caused the formation of fineα-Mg grains and tiny precipitates and made the dissolution ofβ-Mg17Al12 phase into the Mg *** ballistic behaviour of PWHT zones was estimated by measuring the depth of penetration(DOP)of the *** DOP value was observed for the base metal zone(BMZ)of a heat-treated welded *** ballistic SEM examinations on the cross-section of all three zones of crater region showed the formation of adiabatic shear band(ASB).

关键词： AZ31B magnesium alloy post-weld heat treatment ballistic behaviour penetration depth adiabatic shear band

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Effect of deep cryogenic treatment on the microstructural, mechanical and ballistic properties of AA7075-T6 aluminum alloy

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Defence technology 2023年第12期

作者： S.dharani kumar U.Magarajan Saurabh S kumar Rodríguez-Millán M

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