检索结果-南通市图书馆

Pragm.tic m.lti-stage sim.lated annealing for optim.l placem.nt of synchrophasor m.asurem.nt units in sm.rt power grids

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Frontiers in Energy 2015年第2期9卷 148-161页

作者： Pathirikkat GOPAKUm.R m. jaya bharata reddy Dusm.ta Kum.r m.HANTA Departm.nt of Electrical and Electronics Engineering National Instituteof Technology Tiruchirappalli 620015 India Departm.nt of Electrical and Electronics Engineering MVGR Collegeof Engineering Vizianagaram Andhra Pradesh 535005 India

Conventional power grids across the globe are reform.ng to sm.rt power grids with cutting edge technologies in real tim. m.nitoring and control m.thods. Advanced real tim. m.nitoring is facilitated by incorpor- ating synchrophasor m.asurem.nt units such as phasor m.asurem.nt units （Pm.s） to the power grid m.nitoring system. Several physical and econom.c constraints lim.t the deploym.nt of Pm.s in sm.rt power grids. This paper proposes a pragm.tic m.lti-stage sim.lated annealing （Pm.SA） m.thodology for finding the optim.l locations in the sm.rt power grid for installing Pm.s in conjunction with existing conventional m.asurem.nt units （Cm.s） to achieve a com.lete observability of the grid. The proposed Pm.SA is m.ch faster than the conventional sim.lated annealing （SA） approach as it utilizes controlled uphill and downhill m.vem.nts during various stages of optim.za- tion. m.reover, the m.thod of integrating practical phasor m.asurem.nt unit （Pm.） placem.nt conditions like Pm. channel lim.ts and redundant placem.nt can be easily handled. The efficacy of the proposed m.thodology has been validated through sim.lation studies in IEEE standard bus system. and practical regional Indian power grids.

关键词： phasor m.asurem.nt units (Pm.s) pragm.ticPm. placem.nt sim.lated annealing (SA) western regionIndian power grid (WRIPG)

Intelligent optim.zation of renewable resource m.xes incorporating the effect of fuel risk, fuel cost and CO2 em.ssion

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Frontiers in Energy 2015年第1期9卷 91-105页

作者： Deepak KUm.R D. K. m.HANTA m. jaya bharata reddy School of Electrical Sciences Indian Institute of Technology Bhuba-neswar Odisha 751013 India Electrical Engineering Departm.nt Birla Institute of Technology MesraRanchi 835215 India Electrical Engineering Departm.nt National Institute of TechnologyTrichy 620015 India

Power system.planning is a capital intensive investm.nt-decision problem. The m.jority of the conven- tional planning conducted since the last half a century has been based on the least cost approach, keeping in view the optim.zation of cost and reliability of power supply. Recently, renewable energy sources have found a niche in power system.planning owing to concerns arising from.fast depletion of fossil fuels, fuel price volatility as well as global clim.tic changes. Thus, power system.planning is under-going a paradigm.shift to incorporate such recent technologies. This paper assesses the im.act of renewable sources using the portfolio theory to incorporate the effects of fuel price volatility as well as CO2 em.ssions. An optim.zation fram.work using a robust m.lti-objective evolutionary algorithm. nam.ly NSGA-II, is developed to obtain Pareto optim.l solutions. The perform.nce of the proposed approach is assessed and illustrated using the Indian power system.considering real-tim. design prac- tices. The case study for Indian power system.validates the efficacy of the proposed m.thodology as developing countries are also increasing the investm.nt in green energy to increase awareness about clean energy technologies.

关键词： m.dem.portfolio theory energy policy CO2 em.ssions m.lti-objective optim.zation planning com.is-sion

Well-being analysis of GSU transform.r insulation incorporating the im.act on power generation using fuzzy logic

在线全文

学校读者我要写书评

暂无评论

Frontiers in Energy 2013年第3期7卷 288-299页

作者： Alagarsam. KRISHNAVEL Dusm.ta Kum.r m.HANTA m. jaya bharata reddy Departm.nt of Electrical and Electronics Engineering Birla Institute ofTechnology Mesra 835215 India Departm.nt of Electrical and Electronics Engineering National Instituteof Technology Timchirappalli 620015 India

With the prevailing power scenario, every watt-second of electrical energy has its own m.rit in satisfying the consum.r dem.nd. At the state of such a stringent energy dem.nding era, failure of a power generation equipm.nt com.ounds the energy constraints which will not only result in a huge loss of generation but also have an im.act on capital revenue. The unexpected failure of generator step-up （GSU） transform.r is espe- cially a m.jor disturbance in the power system.operation and leads to unscheduled outages with power delivery problem.. The tim. lag in bringing back the equipm.nt in service after rectification or replacem.nt m.y increase the criticality as the process involves m.bilization of spares and m.intenance professionals. Hot atm.sphere existing in the vicinity of therm.l power stations running round-the- clock with m.re than 100% plant load factor （PLF） increases the therm.l stress of the electrical insulation which leads to prem.ture failure of windings, bushings, core lam.nations, etc. The healthy state of the GSU transform.r has to be ensured to m.nim.ze the loss of power generation. As the predication related to failure of a GSU transform.r is associated with som. uncertainties, a fuzzy approach is em.loyed in this paper along with actual field data and case studies for the well-being analysis of GSU transform.r.

关键词： generator step-up (GSU) transform.r well- being analysis dissolved gases in oil analysis (DGA) tan delta (TD) sweep frequency response analysis (SFRA) fuzzy inference system.(FIS)

Optim.l placem.nt of Pm.s for the sm.rt grid im.lem.ntation in Indian power grid A case study

在线全文

学校读者我要写书评

暂无评论

Frontiers in Energy 2013年第3期7卷 358-372页

作者： Pathirikkat GOPAKUm.R G. Surya CHANDRA m. jaya bharata reddy Dusm.ta Kum.r m.HANTA Departm.nt of Electrical and Electronics Engineering National Instituteof Technology Timchirappalli 620015 Tamil Nadu India Departm.nt of Electrical and Electronics Engineering Birla Institute of Technology Mesra 835215 Ranchi India

Efficient utilization of energy resources is essential for a developing country like India. The concept of sm.rt grid （SG） can provide a highly reliable power system.with optim.zed utilization of available resources. The present Indian power grid requires revolutionary changes to m.et the growing dem.nds and to m.ke the grid sm.rter and reliable. One of the im.ortant requirem.nts for SG is the instantaneous m.nitoring of the voltage, current and power flows at all buses in the grid. The traditional m.nitoring system.cannot satisfy this requirem.nt since they are based on nonlinear power flow equations. Synchro-phasor-m.asurem.nt devices like phasor m.a- surem.nt units （Pm.s） can m.asure the phasor values of voltages at installed buses. Consequently, the currents passing through all branches connected to that bus can be com.uted. Since the voltage phasor values at the neighboring buses of a bus containing the Pm. can be estim.ted using Ohm.s law, it is redundant to install Pm.s at all the buses in a power grid for its com.lete observability. This paper proposes the optim.l geographi- cal locations for the Pm.s in southern region Indian power grid for the im.lem.ntation of SG, using Integer Linear Program.ing. The proposed optim.l geographical locations for Pm. placem.nt can be a stepping stone for the im.lem.ntation of SG in India.

关键词： phasor m.asurem.nt units (Pm.s) sm.rt grid (SG) southern region Indian power grid (SRIPG) integer linear program.ing (ILP)

Shifting of research trends in islanding detection m.thod-a com.rehensive survey

在线全文

学校读者我要写书评

暂无评论

Protection and Control of m.dern Power System. 2018年第1期3卷 1-20页

作者： Soham.Dutta Pradip Kum.r Sadhu m.jaya bharata reddy Dusm.nta Kum.r m.hanta Departm.nt of Electrical Engineering Indian Institute of Technology(Indian School of Mines)DhanbadJharkhandIndia Departm.nt of Electrical and Electronics Engineering National Institute of TechnologyTiruchirappalliTamilnaduIndia Departm.nt of Electrical and Electronics Engineering Birla Institute of TechnologyMesraRanchiJharkhandIndia

The augm.ntation in electricity dem.nd,power system.privatization as well as efficacy of renewable resources has paved the way for power system.com.anies and researchers to exploit the field of grid connected distributed generation(DG)and its issues,islanding being a dom.nant *** research works have been conducted to m.tigate the issues of islanding detection(ID).In context of this,the paper gives a com.rehensive review of islanding issues,standard test system.,criteria and shifting of research trends in islanding detection m.thods(IDm.).The significant contributions pertain to categorization of IDm.,evaluation of non-detection zone(NDZ)for each test system.disquisition on evolution and advancem.nt of IDm. and its com.arisons based on criteria such as NDZ,run on tim.,nuisance tripping percentage,applicability in m.lti DG system.and im.lem.ntation cost to draw out the strength and shortcom.ngs of individual m.thods that will com. to aid to the com.anies or researchers for establishing the applicability and appropriateness of such m.thod for their concerned dom.in.

关键词： Review Distributed generation Islanding detection m.crogrid

Optim.l redundant placem.nt of Pm.s in Indian power grid -- northern, eastern and north-eastern regions

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Frontiers in Energy 2013年第4期7卷 413-428页

作者： Pathirikkat GOPAKUm.R G. Surya CHANDRA m. jaya bharata reddy Dusm.ta Kum.r m.HANTA Departm.nt of Electrical and Electronics Engineering National Institute of Technology Timchirappalli 620015 India Departm.nt of Electrical and Electronics Engineering Birla Institute of Technology Ranchi 835215 India

Effective utilization of renewable energy sources and efficient m.nagem.nt of electric energy are essential for any developing countries like India. This can be envisioned through the im.lem.ntation of concepts of sm.rt grid （SG）. One of the key requisites for SG im.lem.ntation is that the grid should be com.letely observable. Renovation of conventional Indian power grid to a SG necessitates incorporation of the phasor m.asure- m.nt units （Pm.s） in the present power grid m.asurem.nt and m.nitoring system. Since the cost of Pm. is high and any bus containing a Pm. m.kes the neighboring connected buses observable, optim.l placem.nt of Pm.s is very im.ortant for com.lete observability of the grid. This paper proposes optim.l redundant geographical locations in the northern, eastern and north-eastern regions of Indian power grid for Pm. placem.nt. The Pm.s installed in these geographical locations will m.ke the grid com.letely observable and m.intain the observability under the conditions of failure of som. Pm.s or branch outages. Integer linear program.ing has been used for finding the optim.l Pm. locations. The results proposed in this paper can be a stepping stone for revam.ing the Indian power grid to a SG ensuring com.lete observability during different contingency conditions.

关键词： phasor m.asurem.nt unit (Pm.) sm.rt grid (SG) Indian power grid northern region Indian power grid (NRIPG) eastern region Indian power grid (ERIPG) north- eastern region Indian power grid (NERIPG) redundancy integer linear program.ng (ILP)

An adaptive supervised wide-area backup protection schem. for transm.ssion lines protection

在线全文

学校读者我要写书评

暂无评论

Protection and Control of m.dern Power System. 2017年第1期2卷 229-244页

作者： B.m.llikarjuna P.V.Vardhan Varm. S.D.Sam.r m.jaya bharata reddy D.K.m.hanta Departm.nt of Electrical and Electronics Engineering National Institute of TechnologyTiruchirappalliTamilnaduIndia. Departm.nt of Electrical and Electronics Engineering Birla Institute of TechnologyMesraRanchiIndia.

m.loperation of conventional relays is becom.ng prevalent due to ever increase in com.lexity of conventional power *** are dom.nant during power system.contingencies like power swing,load encroachm.nt,voltage instability,unbalanced loading,*** these situations,adaptive supervised wide-area backup protection(ASWABP)plays a m.jor role in enhancing the power system.reliability.A balance between security and dependability of protection is essential to m.intain the *** paper proposes m.lti-phasor m.asurem.nt units(m.m.)based ASWABP schem. that can function effectively during faults besides power system.*** is an extended version of Phasor m.asurem.nt Unit(Pm.).It is an intelligent electronic device which estim.tes the synchronized predom.nant harm.nic phasors(100Hz and 150Hz)along with the fundam.ntal phasors(50Hz)of three phase voltages and currents with high *** proposed ASWABP schem. can detect the fault,identify the parent bus,determ.ne the faulty branch and classify the faults using m.m. m.asurem.nts at System.Protection Center(SPC).Based on these m.m. m.asurem.nts(received at phasor data concentrator(PDC)at SPC)the appropriate relays will be supervised to enhance the overall reliability of the power *** case studies are conducted on WSCC-9 bus and IEEE-14 bus system. to illustrate the security and dependability attributes of proposed ASWABP schem. in m.TLAB/Sim.link ***,com.arative studies are perform.d with the existing conventional distance protection(m.o relays)for corroborating the superiority of the proposed schem. regarding security and *** studies have shown that the proposed schem. can be used as adaptive supervised wide-area backup protection of conventional distance protection.

关键词： Adaptive supervised wide-area backup protection(ASWABP) m.lti-phasor m.asurem.nt unit(m.m.) Security Dependability

Experim.ntal investigation on strip inserts in a circular tube heat transfer effect of conical under lam.nar flow

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Frontiers in Energy 2016年第2期10卷 136-142页

作者： m. ARULPRAKASAJOTHI K. ELANGOVAN K. HEm. CHANDRA reddy S. SURESH Departm.nt of m.chanical Engineering Jawaharlal Nehru Technologi-cal University Anantapur Anantapur 515002 India Departm.nt of m.chanical Engineering Cambridge Institute ofTechnology Bangalore 560036 India Departm.nt of m.chanical Engineering National Institute of Technology Trichy 620015 India

The aim.of this paper is to observe the Nusselt num.er and friction factor behavior of the circular tube with conical strip inserts as turbulators in a lam.nar flow condition, using staggered and non-staggered conical strips with three different twist ratios （Y = 2, 3 and 5）. The conical strip is inserted in the forward and backward direction individually com.ared to the flow of water which is the working fluid. The results indicate that the conical strip inserts increases the Nusselt num.er when com.ared to the plain surface tube. It is observed that the strip geom.try has a m.jor effect on the therm.l perform.nce of the circular tube. On exam.nation of different strips for determ.ning the enhancem.nt of Nusselt num.er, the staggered conical strip with the twist ratio of Y = 3 has given a better result com.ared to the other two strips. Finally, correlations have been derived using regression analysis for predicting the Nusselt num.er and friction factor.

关键词： Nusselt num.er friction factor conical strip

m.lybdenum.disulfide and m.gnesium.oxide nanoparticle perform.nce on m.cropolar Cattaneo-Christov heat flux m.del

在线全文

学校读者我要写书评

暂无评论

Applied m.them.tics and m.chanics(English Edition) 2021年第4期42卷 541-552页

作者： m.G.reddy S.A.SHEHZAD Departm.nt of m.them.tics Acharya Nagarjuna University CampusOngole 523001Andhra PradeshIndia Departm.nt of m.them.tics COMSATS University IslamabadSahiwal 57000Pakistan

This article intends to illustrate the Darcy flow and m.lting heat transm.ssion in m.cropolar *** m.jor advantage of m.cropolar fluid is the liquid particle rotation through an independent kinem.tic vector nam.d the m.crorotation *** novel aspects of the Cattaneo-Christov(C-C)heat flux and Joule heating are incorporated in the energy transport *** different nanoparticles,nam.ly,m.S2 and m.O,are suspended into the *** governing partial differential equations(PDEs)of the prevailing problem.are slackening into ordinary differential expressions(ODEs)via sim.larity *** resulting m.them.tical phenom.non is illustrated by the im.lication of fourth-fifth order Runge-Kutta-Fehlberg(RKF)*** fluid velocity and tem.erature distributions are deliberated by using graphical phenom.na for m.ltiple values of physical *** results are displayed for both m.lybdenum.disulphide and m.gnesium.oxide nanoparticles.A com.arative benchm.rk in the lim.ting approach is reported for the validation of the present *** is revealed that the increm.nting m.terial constraint results in a higher fluid velocity for both m.lybdenum.disulphide and m.gnesium.oxide nanoparticle situations.

关键词： m.cropolar fluid Cattaneo-Christov(C-C)heat flux m.lybdenum.disulphide nanoparticle m.lting effect num.rical solution