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Optimal PV Array Configuration for Extracting Maximum Power Under Partial Shading Conditions by Mitigating Mismatching Power Losses

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CSEE Journal of Power and Energy Systems 2022年第2期8卷 499-510页

作者： praveen kumar Bonthagorla Suresh Mikkili the Electrical and Electronics Engineering Department National Institute of Technology Goa403401India

The grid-connected or standalone PV central inverter architecture is comprised of several PV modules which are connected in different ways to form the PV *** power generation capability of the PV array is primarily affected by partial shading conditions(PSC).Due to PSCs,the power output of the PV array is dramatically reduced,and mismatching losses are induced in the PV *** on the extent of these problems,multiple peaks also appear in the power-voltage(P-V)curve,which makes it very difficult to track the global maximum power point(GMPP).The main objective of this research paper is to model and simulate the series(S),series-parallel(SP),bridge-link(BL),honey-comb(HC),total-cross-tied(TCT)and proposed triple-tied(TT)solar PV array configurations under various partial shading *** performance of all PV configurations is evaluated under a uniform approach,considering eight different shading *** performance of the considered PV configurations is analyzed in terms of their mismatching power losses,fill factors,efficiency,global maximum power points(GMPPs),local maximum power points(LMPPs),voltages and currents at GMPPs,open circuit voltage and short circuit *** above-mentioned PV configurations are modeled and simulated in a Matlab/Simulink environment by considering the KC-200GT module parameters.

关键词： Photo voltaic(PV) PV array configurations triple-tied(TT) maximum power point(MPP) partial shading mismatching power losses fill factor efficiency

Performance Investigation of Hybrid and Conventional PV Array Configurations for Grid-connected/Standalone PV Systems

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CSEE Journal of Power and Energy Systems 2022年第3期8卷 682-695页

作者： praveen kumar Bonthagorla Suresh Mikkili Department of Electrical and Electronics Engineering National Institute of TechnologyGoaIndia

Currently,the critical challenge in solar photovoltaic(PV)systems is to make them energy *** of the key factors that can reduce the PV system power output is partial shading conditions(PSCs).The reduction in power output not only depends on a shaded region but also depends on the pattern of shading and physical position of shaded modules in the *** to PSCs,mismatch losses are induced between the shaded modules which can cause several peaks in the output power-voltage(P-V)*** series-parallel(SP),total-cross-tied(TCT),bridge-link(BL),honey-comb(HC),and triple-tied(TT)configurations are considered as conventional configurations,which are severely affected by PSCs and generate more mismatch power losses along with a greater number of local *** reduce the effect of PSCs,hybrid PV array configurations,such as series-parallel:total-cross-tied(SP-TCT),bridge-link:total-cross-tied(BL-TCT),honey-comb:total-cross-tied(HC-TCT)and bridge-link:honey-comb(BL-HC)are *** paper briefly discusses the modeling,simulation and performance evaluation of hybrid and conventional 7×7 PV array configurations during different PSCs in a Matlab/Simulink *** performance of hybrid and conventional PV configurations are evaluated and compared in terms of global maximum power(GMP),voltage and currents at GMP,open and short circuit voltage and currents,mismatch power loss(MPL),fill factor,efficiency,and a number of local maximum power peaks(LMPPs).

关键词： Fill factor global maximum power(GMP) hybrid PV array configuration maximum power point(MPP) mismatch power loss(MPL) partial shading triple-tied(TT)

MOVING INCLINED LOAD AT BOUNDARY SURFACE

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Applied Mathematics and Mechanics(English Edition) 2005年第4期26卷 476-485页

作者： Rajneesh kumar praveen Ailawalia Department of Mathematics Kurukshetra UniversityKurukshetra 136119 Haryana IndiaDepartment of Mathematics I.E.E.T Makhnumajra Baddi Distt. Solan H.P 173205 India

The analytic expressions for the displacement components and stresses at a point of an orthotropic micropolar elastic medium with an overlying elastic half space as a result of moving inclined load of arbitrary orientation were obtained. The inclined load was assumed to be a linear combination of a normal load and a tangential load. The eigen value approach using Fourier transforms was employed and the transform was inverted by using a numerical *** numerical results were illustrated graphically for aluminium epoxy composite.

关键词： orthotropic micropolar moving inclined load eigenvalue Fourier transform

DEFORMATION DUE TO TIME HARMONIC SOURCES IN MICROPOLAR THERMOELASTIC MEDIUM POSSESSING CUBIC SYMMETRY WITH TWO RELAXATION TIMES

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Applied Mathematics and Mechanics(English Edition) 2006年第6期27卷 781-792页

作者： Rajneesh kumar praveen Ailawalia Department of Mathematics Kurukshetra University KurukshetraHaryanaINDIA136119 Department of Applied Sciences Institute of Engineering and Emerging Technologies MakhnumajraBaddi Distt. SolanH.PINDIA173205

The response of a micropolar thermoelastic medium possessing cubic symmetry with two relaxation times due to time harmonic sources is investigated. Fourier transform is employed and the transform is inverted by using a numerical inversion technique. The components of displacement, stress, microrotation and temperature distribution in the physical domain are obtained numerically. The results of normal displacement, normal force stress, tangential couple stress and temperature distribution are compared for micropolar cubic crystal and micropolar isotropic solid. The numerical results are illustrated graphically for a particular material. Some special cases are also deduced.

关键词： time harmonic thermoelastic micropolar medium cubic symmetry microrotation Fourier transform

Cost Optimized Switching of Routing Protocol Scheme for IoT Applications

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Computer Systems Science & Engineering 2022年第4期41卷 67-82页

作者： Karunanithi praveen kumar Perumal Sivanesan School of Computing SASTRA UniversityThanjavur613401TamilnaduIndia

In this work,we propose a context-aware switching of routing protocol scheme for speciﬁc application requirements of IoT in real-time using a software-deﬁned networking controller in wireless sensor *** work planned has two stages i)Selection of suitable routing protocol(RP)for given IoT applications using higher cognitive process and ii)Deployment of the corresponding routing *** use the supervised learning-regression method for classiﬁcation of the routing protocol while considering the network parameters like stability,path delay,energy utilization,and *** chosen routing protocol will be set in the sensor network using a software-deﬁned networking controller in an exceedinglyﬂexible manner during the second *** simulation has been done and results are evaluated to point out the strength of the proposed work,while dynamically varying the speciﬁc requirements of IoT *** observe that the work proposed is path-breaking the prevailing methods,where a speciﬁc routing protocol is employed throughout the period of ***’s clearly shown that the proposed,Low-cost Context-Aware Protocol Switching(LCAPS)scheme is efﬁcient in improving the performance of the sensor network and also meets the speciﬁc application requirements of IoT by using Software-Deﬁned Wireless Sensor Networks SDWSNs.

关键词： Internet of things sensor network efﬁciency software-deﬁned networking wireless sensor networks supervised learning cost optimization

Hybrid, Optimal, Intelligent and Classical PV MPPT Techniques: A Review

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CSEE Journal of Power and Energy Systems 2021年第1期7卷 9-33页

作者： Ratnakar Babu Bollipo Suresh Mikkili praveen kumar Bonthagorla Department of Electrical and Electronics Engineering National Institute of Technology GoaFARMAGUDIPondaGoa 403401India

Renewable energy-based solar photovoltaic(PV)generation is the best alternative for conventional energy sources because of its natural abundance and environment friendly *** power extraction from the PV system plays a critical role in increasing the efficiency of the solar power generation during partial shading conditions(PSCs).Therefore,a suitable maximum power point tracking(MPPT)technique to track the maximum power point(MPP)is of high need,even under *** paper presents an organized and concise review of MPPT techniques implemented for the PV systems in literature along with recent publications on various hardware design *** classification is done into four categories,***,intelligent,optimal,and hybrid depending on the tracking algorithm utilized to track MPP under *** uniform insolation,classical methods are highly preferred as there is only one peak in the P-V ***,under PSCs,the F-V curve exhibits multiple peaks,one global maximum power point(GMPP)and remaining are local maximum power points(LMPP’s).Under the PSCs,classical methods fail to operate at GMPP and hence there is a need for more advanced MPPT *** MPPT technique has its advantages and limits,but a streamlined MPPT is drafted in numerous parameters like sensors required,hardware implementation,cost viability,tracking speed and tracking *** study provides the advancement in this area since some parameter comparison is made at the end of every classification,which might be a prominent base-rule for picking the most gainful sort of MPPT for further research.

关键词： GMPP MPPT classification MPPT techniques partial shading conditions(PSCs) photovoltaic system

Oxidative Stressand Antioxidant Responses in Young Leaves of Mulberry Plants Grown Under Nitrogen, Phosphorus or Potassium Deficiency

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Journal of Integrative Plant Biology 2007年第3期49卷 313-322页

作者： Rajesh kumar Tewari praveen kumar Parma Nand Sharma Department of Botany University of LucknowLucknow226007India

The aim of this study was to associate the generation of reactive oxygen species （ROS） with Induced antloxidant responses and disturbed cellular redox environment in the nitrogen-（N）, phosphorus-（P）, or potassium-（K） deftcient mulberry （Morus alba L. var. Kanva-2） plants. The indicators of oxidative stress and cellular redox environment and antioxldant defense-related parameters were analyzed. Oeficlency of N, P or K suppressed growth, accelerated senescence, and decreased concentrations of chloroplastic pigments and glutathione. Lipid peroxidation and activities of superoxide dismutase, ascorbate peroxidase and glutathione reductase were also increased in these N, P, or K deprived plants. Concentration of hydrogen peroxide Increased in plants deficient in N or P. Oeficlency of N or P particularly altered the cellular redox environment as indicated by changes in the redox couples, namely ascorbic acid/total ascorbate decreased in P-, glutathione sulfydryl/total glutathione decreased in N-, and Increased in P-deficient plants. Activity staining of native gels for superoxide dismutase revealed Increased activity as Indicated by Increased intensity of bands, and induction of few new isoforms in P- and K-deficient plants. Oifferences in the patterns of superoxide dismutase isoforms and redox status （ascorbic acid/total ascorbate and glutathlone sulfydryl/total glutathione） Indicate that N-, P-, or K-deficiency altered antioxidant responses to varying extents in mulberry plants.

关键词： antioxidants potassium-deficiency lipid peroxidation Morus alba mulberry nitrogen-deficiency oxidative stress phosphorus-deficiency reactive oxygen species

Homotopy Perturbation Method for Time-Fractional Shock Wave Equation

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Advances in Applied Mathematics and Mechanics 2011年第6期3卷 774-783页

作者： Mithilesh Singh praveen kumar Gupta Department of Mathematics Dehradun Institute of TechnologyDehradunIndia Department of Applied Mathematics Institute of TechnologyBanaras Hindu UniversityVaranasiIndia

A scheme is developed to study numerical solution of the time-fractional shock wave equation and wave equation under initial conditions by the homotopy perturbation method(HPM).The fractional derivatives are taken in the Caputo *** solutions are given in the form of series with easily computable *** results are illustrated through the graph.

关键词： Partial differential equation fractional derivative shock wave equation homotopy perturbation method

Linking basin-scale hydrology with climatic parameters in western Himalaya:Application of satellite data,temperature index modelling and in-situ observations

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Geoscience Frontiers 2024年第6期15卷 528-544页

作者： Smriti Srivastava MohdFarooq Azam praveen kumar Thakur The Wilkes Centre for Climate Science and Policy University of UtahSalt Lake CityUSA School of Environment Society and SustainabilityUniversity of UtahSalt Lake CityUSA Department of Civil Engineering Indian Institute of Technology IndoreIndia Department of Water Resources Indian Institute of Remote Sensing(IIRS)ISRODehradunIndia

Due to limited spatial and temporal in-situ runoff data availability,Himalaya-Karakoram(HK)glaciohydrology has a significant knowledge gap between large-scale and small-scale runoff modelling *** study reconstructs longest basin-wide runoff series in Chandra-Bhaga Basin by applying a high-resolution glaciohydrological model SPHY(Spatial Processes in Hydrology)over 1950–***-tier model calibration is done using in-situ basin-wide runoff(1973–2006)and MODIS snow cover(2003–2018).Model validation is done against in-situ Chhota Shigri Glacier catchment-wide runoff(2010–2015).The modelled mean annual basin-wide runoff is 60.21±6.17 m^(3)/s over 1950–2022,with maximum runoff in summer-monsoon months,peaking in July(182.69 m^(3)/s).Glacier runoff(ice melt+snowmelt over glacier)contributes maximum(39%)followed by equal contributions from snowmelt runoff from non-glacierized basin area and baseflow(25%),while rainfall-runoff contributes minimum(11%)to total *** is a significant volumetric increase by∼7%from pre-(59.17 m^(3)/s)to post-2000(63.47 m^(3)/s)mainly because of early onset of snowmelt post-2000 that resulted in a hydrograph shift by∼25 days earlier in *** glacier runoff is overestimated by 3%from RGI 7.0 inventory compared to different manually delineated inventories over 1950–2022,because of higher glacierized area from RGI *** precipitation shows a negative trend,but total runoff shows a positive trend due to positive trend of temperature that resulted in more glacier runoff and rainfall-runoff for basin over last 72 ***-wide runoff is mainly governed by summer temperature which directly controls the amount of glacier and snowmelt runoffs and is supported by summer *** study highlights importance of basin-scale model calibration with in-situ data in large scale studies and stresses the need for in-situ observations in high-altitude Himalayan ***-scale calibrated model parameters are transferable to glacie

关键词： Himalaya Glaciohydrological model Glacier runoff Baseflow Pre-and post-2000 Chandra-Bhaga Basin