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Power Quality Improvement for Grid-connected PV System Based on Distribution Static Compensator with Fuzzy Logic Controller and UVT/ADALINE-based Least Mean Square Controller

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Journal of Modern Power Systems and Clean Energy 2021年第6期9卷 1289-1299页

作者： Amit kumar pradeep kumar Electrical and Electronics Engineering Department Natioanl Institute of Technology Sikkim

This paper presents a novel method of power quality enrichment in a grid-connected photovoltaic(PV) system using a distribution static compensator(DSTATCOM). The paper consists of two-step control processes. In the primary step, a fuzzy logic controller(FLC) is employed in the DC-DC converter to extract the peak power point from the PV panel, where the FLC produces a switching signal for the DC-DC *** the secondary step, a unit vector template(UVT)/adaptive linear neuron(ADALINE)-based least mean square(LMS) controller is adopted in the DC-AC converter, i. e., voltage source converter(VSC). The input to this VSC is the boosted DC voltage, which originates from the PV panel as a result of DC-DC conversion. The VSC shunted with the power grid is known as a DSTATCOM, which can maintain the power quality in the distribution system. The UVT controller generates reference source currents from the grid voltages and DC-link *** ADALINE-based LMS controller calculates the online weight according to the previous weights by the sensed load current. The UVT/ADALINE-based LMS controller of a DSTATCOM performs several tasks such as maintaining the sinusoidal source current, achieving a unity power factor, and performing reactive power compensation. The reference current extracted from the UVT/ADALINE-based LMS controller is fed to the hysteresis current controller to obtain the desired switching signal for the VSC. A 100 k W solar PV system integrated into a three-phase four-wire distribution system through a four-leg VSC is designed in MATLAB/Simulink. The performances of the FLC and UVT/ADALINE-based LMS controllers are demonstrated under various irradiances as well as constant temperature and nonlinear loading conditions.

关键词： Adaptive linear neuron least mean square(LMS) fuzzy logic controller(FLC) maximum power point tracking(MPPT) photovoltaic(PV) unit vector template

Computation of Resonant Frequency of Gap-coupled Ring Microstrip Antennas

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International Journal of Automation and computing 2014年第6期11卷 671-675页

作者： pradeep kumar Department of Electronics and Communication Engineering Jaypee University of Information TechnologyWaknaghat- 173234 India

In this paper, an analytical model for computing the resonant frequency of the gap-coupled ring microstrip patch antennas is developed. The analytical model is based upon the cavity model along with circuit theory. Using the field expressions and boundary conditions, the transcendental equation for the structure is developed. The analytically computed results are compared with the simulated results. The simulation work is carried out by using computer simulation technology(CST) microwave studio *** comparison between simulated and computed results shows good agreement.

关键词： Ring microstrip antenna gap-coupling resonant frequency analytic model parasitic element

Herbal anthelmintic agents: a narrative review

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Journal of Traditional Chinese Medicine 2022年第4期42卷 641-651页

作者： Manjusa Adak pradeep kumar Department of Pharmaceutical Sciences and Natural Products Central University of PunjabGhuddaBathindaPunjab 151401India

Helminths or Parasitic worms of humans may cause chronic and sometimes deadly diseases,considered as neglected tropical diseases(NTDs)that infect around two billion people *** have been used as anthelmintics from ancient *** review is a compilation of plants as source of anthelmintic *** information presented in this review article regarding the anthelmintic activities of plants from 2005 and has been acquired by approaching various electronic databases,including Scopus,Google scholar,Web of science and *** was surveyed for anthelmintic activity of plants which showed that secondary metabolites of plants like terpenes,glycosides,saponins,flavonoids,tannins and alkaloids were having anthelmintic *** this review is a compilation of anthelmintic activity of plants from the year 2005,it will definitely be a fruitful study for researchers working in this field.

关键词： helminths helminthiasis anthelmintics biological products

CHEMICAL SYNTHESIS,SPECTRAL CHARACTERIZATION AND STABILITY OF SOME ELECTRICALLY CONDUCTING POLYMERS

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Chinese Journal of Polymer Science 2010年第2期28卷 191-197页

作者： pradeep kumar Upadhyay Afaq Ahmad Department of Chemistry Aligarh Muslim University

The synthesis, characterization, thermal degradation and stability of polyaniline （PANI）, poly（m-nitroaniline）, poly（m-chloroaniline） and poly（o-methylaniline） were reported. Different properties were measured and compared with PANI to find out the effect of electron donating groups （-CH3） and electron withdrawing groups （-Cl, -NO2）. It was found that the presence of any type of substitution in the benzene ring of aniline increased the solubility but reduced the yield, thermal stability and electrical conductivity. Two probe methods were used to measure the electrical conductivity of these polymers. The structural properties of these polymers were characterized by using FTIR and UV-Vis spectroscopic methods. Thermal degradation and stability of these polymers were explained by using thermogravimetric analysis （TGA） and conductivity measurements.

关键词： Polyaniline Electrical conductivity Yield Thermal degradation Stability.

Numerical investigation of the effect of transitory strand opening on mixing in a multistrand tundish

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International Journal of Minerals,Metallurgy and Materials 2011年第5期18卷 535-542页

作者： Sabin kumar Mishra pradeep kumar Jha Satish Chandra Sharma Satish kumar Ajmani Department of Mechanical and Industrial Engineering Indian Institute of Technology RoorkeeRoorkee 247667UttarakhandIndia Steelmaking and Casting Research Group Tata SteelR&DBurma MinesJamshedpur 831007JharkhandIndia

In a multistrand,the outlet near the inlet produces short circuiting *** leads to the formation of dead zones inside the tundish,and consequently,the mean residence time *** the present study,numerical investigation of mixing inside a delta shaped tundish with sloping boundaries was carried out by solving the Navier-Stokes equation and employing the standard turbulence *** decrease the dead zone volume inside the tundish,the effect of closing the outlet near the inlet for a small amount of time and further opening it on the mixing behavior of the tundish was *** outlets near the inlet were closed for varying amount of time,and the transient analysis of fluid flow and the tracer dispersion study were carried out to find the mixing parameters of the tundish,namely,mean residence time and the ratio of mixed to dead volume of the *** optimum closure time of the near outlet has been found,which yields best mixing inside the *** numerical code was validated against the experimental observation by performing the tracer dispersion study inside a multistrand tundish and the reasonably good match between the experimental and numerical results in terms of residence time distribution （RTD） *** results obtained from the present study confirm the strong role of choosing the right time for opening and closing the outlets to get improved characteristics for the fluid flow and mixing behavior of the *** educational version of computational fluid dynamics （CFD） software PHOENICS was used to solve the governing equations and interpret the results in different forms.

关键词： continuous casting billets tundish flow simulation mean residence time dead volume computational fluid dynamics (CFD)

Modelling of Wideband Concentric Ring Frequency Selective Surface for 5G Devices

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Computers, Materials & Continua 2023年第1期74卷 341-361页

作者： Ankush Kapoor pradeep kumar Ranjan Mishra Department of Electronics and Communication Engineering Jawaharlal Nehru Government Engineering CollegeSundernagar175018India Discipline of Electrical Electronic and Computer EngineeringUniversity of KwaZulu-NatalDurban4041South Africa Department of Electrical and Electronics Engineering University of Petroleum and Energy StudiesDehradun248007India

Frequency selective surfaces(FSSs)play an important role in wireless systems as these can be used as filters,in isolating the unwanted radiation,in microstrip patch antennas for improving the performance of these antennas and in other 5G *** analysis and design of the double concentric ring frequency selective surface(DCRFSS)is presented in this *** the sub-6 GHz 5G FR1 spectrum,a computational synthesis technique for creating DCRFSS based spatial filters is *** analytical tools presented in this study can be used to gain a better understanding of filtering processes and for constructing the spatial *** of the loop sizes,angles of incidence,and polarization of the concentric rings are the factors which influence the transmission coefficient as per the thorough investigation performed in this paper.A novel synthesis approach based on mathematical equations that may be used to determine the physical parameters ofDCRFSSbased spatial filters is *** proposed synthesis technique is validated by comparing results from high frequency structure simulator(HFSS),Ansys electronic desktop circuit editor,and an experimental ***,the findings acquired from a unit cell are expanded to a 2×2 array,which shows identical performance and therefore proves its stability.

关键词： Spatial filters double concentric ring frequency selective surface(DCRFSS) angle of incidence finite element method(FEM) polarization angles

User grouping and optimization-based pilot scheduling for mitigating the pilot contamination in massive multi cell MIMO systems

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维普期刊数据库

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International Journal of Modeling, Simulation, and Scientific Computing 2020年第6期11卷 161-184页

作者： Ambala pradeep kumar Tadisetty Srinivasulu Department of Electronics and Communication Engineering KU College of Engineering and Technology Kakatiya University WarangalTelanganaIndia

Massive multiple-input multiple-output(massive MIMO)is a promising approach in wireless communication systems for providing improved link reliability and spectral effi-ciency and it helps several *** main aim is to solve pilot contamination issue in massive MIMO systems;this research paper utilizes two approaches for reducing the *** paper presents the user grouping approach based on sparse fuzzy C-means clustering(sparse FCM),which groups user parameters based on parameters such as large-scale fading factor,SINR,and user ***,same pilot sequences are assigned to center users in which the impact of pilot contamination is limited,while the algorithm assigns orthogonal pilot sequences to the edge users that suffer severely from pilot ***,the proposed user grouping keeps away from the inappropriate grouping of users,enabling effective grouping even under the worst situations of the ***,pilot scheduling is done based on elephant spider monkey optimization(ESMO),which is designed by integrating elephant herding optimization(EHO)into spider monkey optimization(SMO).The performance of pilot scheduling based on grouping-based ESMO is evaluated based on achievable rate and *** proposed method achieves maximal achievable rate of 41.29 bps/Hz and maximal SINR of 124.31 dB.

关键词： Massive MIMO system sparse fuzzy FCM user grouping pilot scheduling large-scale fading factor.

Experimental investigation of tandem rotor under clean and radially distorted inflows

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Propulsion and Power Research 2021年第3期10卷 247-261页

作者： Amit kumar A.M.pradeep Department of Aerospace Engineering Indian Institute of Technology BombayMumbai400076India

With increasing emphasis on renewable sources of energy,the gas turbine engine faces several challenges in evolving its design,to remain *** is one of the main components,which accounts for one-third of the engine *** designers have been exploring different ideas to achieve maximum pressure rise with minimum number of stages *** blading is one such novel design that has demonstrated higher diffusion capability than a single rotor blade.A single blade,with a higher diffusion factor,carries the risk of flow separation against the adverse pressure gradient of the compressor *** the tandem blading concept,a single blade is split into forward and aft *** gap that is created between the forward and aft blade,serves as a mechanism to energize the sluggish flow over the aft blade suction surface,which in turn helps in mitigating the flow *** present experimental work is aimed at exploring the feasibility of a tandem rotor in an axial flow compressor under the clean and radially distorted *** and unsteady experimental results of the tandem rotor are included in this *** stage performance characteristics,variation of total pressure,flow coefficient,and exit flow angle along the blade span for clean and distorted flow is included in this *** results of a steady Reynolds-averaged Navier-Stokes simulation are also included to give some insight into the complex flow field of the tandem *** transform,fast Fourier transform analysis,and visual inspection of casing pressure traces are used to analyze the unsteady result of the tandem rotor in clean and distorted *** tandem rotor is able to achieve its design pressure ratio and has a stall margin of 9%under the clean flow ***,stall appears as a low-intensity spike for all the cases,which turns into a long length-scale disturbance within three rotor revolutions.A modal wave of low frequency is also observed under clean

关键词： Tandem rotor Axial overlap and percentage pitch Radially distorted inflows Diffusion factor Stall Aerodynamics of compressor blade

Unlocking new potential of clinical diagnosis with artificial intelligence:Finding new patterns of clinical and lab data

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维普期刊数据库

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World Journal of Diabetes 2024年第3期15卷 308-310页

作者： pradeep kumar Dabla Department of Biochemistry Govind Ballabh Pant Institute of Postgraduate Medical Education and ResearchDelhi 110002India

Recent advancements in science and technology,coupled with the proliferation of data,have also urged laboratory medicine to integrate with the era of artificial intelligence(AI)and machine learning(ML).In the current practices of evidencebased medicine,the laboratory tests analysing disease patterns through the association rule mining(ARM)have emerged as a modern tool for the risk assessment and the disease stratification,with the potential to reduce cardiovascular disease(CVD)*** are the well recognised leading global cause of mortality with the higher fatality rates in the Indian population due to associated factors like hypertension,diabetes,and lifestyle ***-driven algorithms have offered deep insights in this field while addressing various challenges such as healthcare systems grappling with the physician *** medicine,well driven by the big data necessitates the integration of ML techniques and high-quality electronic health records to direct the meaningful *** technological advancements enhance the computational analyses for both research and clinical *** plays a pivotal role by uncovering meaningful relationships within databases,aiding in patient survival prediction and risk factor *** potential in laboratory medicine is vast and it must be cautiously integrated while considering potential ethical,legal,and privacy ***,an AI ethics framework is essential to guide its responsible *** AI algorithms with existing lab practices,promoting education among healthcare professionals,and fostering careful integration into clinical settings are imperative for harnessing the benefits of this transformative technology.

关键词： Laboratory medicine Artificial intelligence Machine learning Association rule mining Cardiovascular diseases