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Wind energy conversion system using perturb&observe-based maximum power point approach interfaced with t-type three-level inverter connected to grid

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Clean Energy 2022年第4期6卷 534-549页

作者： Pranupa s A.t.s.iram s.Nagaraja Rao M s Ramaiah University of Applied sciences BangaloreIndia

In this paper,the performance of a permanent magnet.s.nchronous generator(PMsG)-based wind energy conversion system(WECs)supplied to an uncontrolled rectifier-fed boost converter(BC)interfaced with a three-phase t-type three-level inverter(tLI)has been *** proposed WECs involves three converters,namely an uncontrolled rectifier that is used for conversion from AC to DC;a BC supplied by a PMsG-fed rectifier used to enhance the voltage gain;and a grid-connected three-phase t-type tLI is proposed to eliminate power-quality issues with synchronization of grid voltage and *** main goal of this research is to model and control the grid-connected t-type tLI using a d-q synchronous frame for wind energy for regulating the DC-link voltage and transferring the generated wind power from the BC to the ***,the perturb&observe(P&O)-based maximum power point(MPP)approach is recommended to keep track of the MPP for a BC that is supplied from a PMsG-based WECs under constant and variable wind *** proposed PMsG-based WECs interfaced with grid-connected t-type tLI using d-q control has been computationally modelled,simulated and validated with constant and variable speeds using MAtLAB®and simulink®.It is confirmed that the P&O-based MPP approach ensures maximum power for varying wind speeds,and the total harmonic distortion of the t-type tLI grid current value is 3.18%,which is within IEEE-519 ***,with grid synchronization,the power factor of the t-type tLI is maintained at unity to avoid power-quality issues.

关键词： boost converter grid synchronization perturb&observe t-type three-level inverter wind turbine

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Chinese Physics C 2009年第12期33卷 1230-1232页

作者： t.-s. H. Lee Physics Division Argonne National Laboratory Argonne IL 60439 USA Excited Baryon Analysis Center (EBAC) Thomas Jefferson National Accelerator Facility Newport News VA 23606 USA

A summary of the contributions to this workshop is given. the stat.s.and future development of N＊ physics are discussed.

关键词： PWA resonance

CHEMICAL MORPHOLOGY IN GRAFtING ACRYLAMIDE tO POLYEtHYLENE

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Chinese Journal of Polymer science 2008年第3期26卷 275-283页

作者： s.termnak K.sint.s.nai t.Amornsakchai t.Nipithakul D.triampo R3/1 Department of Chemistry and Rubber Center of Excellence Faculty of science Mahidol UniversitySalaya CampusPhuttamonthon Sai 4 Rd.Nakhon Pathom 73170Thailand

the scanning force microscopy (sFM)/chemical force microscopy (CFM) were used to study the growth of grafted polyacrylamide (PAM) chains onto polyethylene (PE)-film with varying grafting *** from the CFM reveal reduced interaction between the probe and areas with grafted-PAM on the *** topography and the friction trace- minus-retrace (tMR) images are complementary to one another resulting from the reduced interaction of the probe that has specificity to chemical domains.

关键词： Chemical force microscopy (CFM) Grafted polyacrylamide PE-film

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普通物理学选择题集

普通物理学选择题集

tHE ELECtROCHEMICAL BEHAVIOR OF OCEANIC MICROBIOLOGICAL INFLUENCED CORROsION ON CARBON stEEL

1981年

作者：（英）奥恩 t.K. （英）休艾特 t.s. 陈茂鑫译

来源：汇雅图书（南通市图书馆... 评论

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Acta Metallurgica sinica(English Letters) 2007年第5期20卷 334-340页

作者： X.t. Chang Y.s. Yin G.H. Niu t. Liu s. Cheng s.B. sun Institute of Materials science and technology Ocean University of China Qingdao 266003 China College of Materials science and technology Shandong University Jinan 250061 China

the corrosion behavior of carbon steel in the medium of marine microorganisms was investigated by electrochemical impedance spectra, polarization curves, and so on. Experimental results showed that the corrosion potential of carbon steel moved in a negative direction in the unpurified marine microorganism solution, and the polarization style of the cathodic process did not change. the electrochemical impedance spectra showed that the impedance value of the electrode decreased in the medium with bacteria, which indicated that the existence of microorganism could accelerate the corrosion progress of carbon steel.

关键词： carbon steel microbiological influenced corrosion polarization curve electrochemical impedance spectroscopy

Unified MPPt Controller for Partially shaded Panels in a Photovoltaic Array

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International Journal of Automation and computing 2014年第5期11卷 536-542页

作者： R.sridhar s.Jeevananthan s.s.Dash N.t.s.lvan Department of Electrical and Electronics Engineering SRM University Department of Electrical and Electronics Engineering Pondicherry Engineering College

the power output of the photovoltaic(PV) system having multiple arrays gets reduced to a great extent when it is partially shaded due to environmental hindrances. the maximum power trackers which are conventionally used may not be competent enough to find the maximum power point(MPP) during partially shaded conditions. the sensible reason for the failure of conventional trackers is during partial shaded conditions the PV arrays exhibit multi peak power curves, thereby making simple maximum power point tracking(MPPt) algorithms like perturb and observe(P&O) to get.s.uck with local maxima instead of capturing global ***, global search MPPt aided by evolutionary and swarm intelligence algorithms will be conducive to find global power point during partially shaded conditions. this work suggests a unified controller which feeds control signal to its power electronic conditioner placed at each module. the evolutionary algorithm which is taken into consideration in this work is differential evolution(DE).the performance of the proposed method is compared to the classical un-dimensional search controller and it is evident from the Matlab/simulink results that the unified controller prevails over the distributed counterpart.

关键词： Maximum power point tracking (MPPt) solar energy photovoltaic (PV) differential evolution (DE) solar power generation evolutionary algorithm soft computing

suzuki Reaction of Aryl Bromides Using a Phosphine-Free Magnetic Nanoparticle-supported Palladium Catalyst

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催化学报 2011年第11期32卷 1667-1676页

作者： Nghia t. BUI trung B. DANG Ha V. LE Nam t. s. PHAN Department of Chemical Engineering HCMC University of Technology VNU-HCM 268 Ly Thuong Kiet Distriet 10 Ho Chi Minh City Viet Nam

A palladium catalyst immobilized on superparaganetic nanoparticles was prepared with a palladium loading of 0.30 mmol/g. the catalyst was characterized using X-ray diffraction, scanning electron microscopy, transmission electron microscopy, vibrating sample magnetometry, thermogravimetric analysis, Fourier transform infrared, atomic absorption spectrophotometry, and nitrogen adsorption. the immobilized palladium catalyst was an efficient catalyst without added phosphine ligands for the suzuki cross-coupling reaction of several aryl bromides with phenylboronic acid. the recovery of catalyst was simply by magnetic decantation in the presence of a magnet. the immobilized palladium catalyst can be reused many times without.s.gnificant degradation in catalytic activity. No leaching of active palladium species into the reaction solution was detected.

关键词： superparamagnetic nanoparticle suzuki reaction palladium aryl bromide

Fuzzy-Based secure Clustering with Routing technique for VANEts

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Computer systems science & Engineering 2022年第10期43卷 291-304页

作者： t.s.Balaji s.srinivasan s.Prasanna Bharathi B.Ramesh saveetha school of Engineering Saveetha Institute of Medical and Technical SciencesSaveetha UniversityChennai602105India Department of Electronics and Communication Engineering College of Engineering&TechnologySRM Institute of Science and TechnologyVadapalani CampusChennai600026India Institute of Biomedical Engineering Saveetha School of EngineeringSaveetha Institute of Medical and Technical SciencesSaveetha UniversityChennai602105India Department of Electronics and Communication Engineering SRM Institute of Science and Technology600026ChennaiIndia Department of Civil Engineering Saveetha School of EngineeringSaveetha Institute of Medical and Technical SciencesSaveetha UniversityChennai602105India

Due to the advanced developments in communication technologies,Internet of vehicles and vehicular adhoc networks(VANEt)offers numerous opportunities for effectively managing transportation *** the other,the cloud environment needs to disseminate the emergency message to the vehicles which are consistently distributed on the roadway so that every vehicle gets the messages from closer vehicles in a straightforward *** resolve this issue,clustering and routing techniques can be designed using computational intelligence *** this motivation,this paper presents a new type-2 fuzzy sets based clustering with metaheuristic optimization based routing(t2FsCMOR)technique for secure communication in *** t2FsC-MOR technique aims to elect CHs and optimal rout.s.for secure intercluster data transmission in *** proposed model involves t2FsC technique for the selection of CHs and construction of *** t2FsC technique uses different parameters namely traveling speed(ts),link quality(LQ),trust factor(tF),inter-vehicle distance(IVD),and neighboring node count(NCC).the inclusion of trust factor helps to select the proper cluster heads(CHs)for secure data dissemination ***,trust aware seagull optimization based routing(t.s.OR)approach was derived for the optimal selection of rout.s.in *** order to validate the enhanced performance of proposed technique,the set of simulations take place and the outcomes are examined interms of different *** experimental outcomes highlighted the improved performance of the proposed model over the other state of art techniques with a higher throughput of 98%.

关键词： VANEt security clustering routing fuzzy logic systems metaheuristic algorithms

Antidiarrhoeal efficacy of Mangifera indica seed kernel on swiss albino mice

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Asian Pacific Journal of tropical Medicine 2012年第8期5卷 630-633页

作者： Rajan s suganya H thirunalasundari t Jeeva s Department of Microbiology M.R.Govt Arts CollegeMannargudi-614 001Thiruvarur DistrictTamilnaduIndia Department of Microbiology Srimad Andavan Arts and Science CollegeT.V.KoilTiruchirappalli-620 005TamilnaduIndia Department of Biotechnology Bharathidasan UniversityTiruchirappalli-620 024TamilnaduIndia Department of Botany Scott Christian CollegeNagercoil-629 003TamilnaduIndia

Objective:to examine the antidiarrhoeal activity of alcoholic and aqueous seed kernel extract of Mangifera indica(***) on castor oil-induced diarrhoeul activity in swiss albino ***:Mango seed kernels were processed and extracted using alcohol and water. Antidiarrhoeal activity of the extracts were assessed using int.s.inal motility and faecal score ***:Aqueous and alcoholic extracts of *** significantly reduced int.s.inal motility and faecal score in swiss albino ***:the present.s.udy shows the traditional claim on the use of *** seed kernel for treating diarrhoea in southern parts of India.

关键词： Antidiarrhoeal activity Gastroenteritis Diarrhoea Mangifera indica seed kernel extracts