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Mathematical found.tions of the instantaneous power concepts: A geometrical approach - Mathematical found.tions of the instantaneous power concepts: An algebraic approach - Reply

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EUROPEAN TRANSACTIONS ON ELECTRICAL POWER 1996年第5期6卷 314-314页

作者： Willems, JL Cristald., L Ferrero, A [?]From the Massachusetts Institute of Technology Cambridge and the Ph. D. degree in applied science from the University of Gent in 1963 1964 and 1967 respectively. In 1964 he joined the Engineering Faculty of the University of Gent where he is presently Professor of Electrical Engineering. In 1970 he was on leave at the Division of Engineering and Applied Physics of Harvard University Cambridge Mass./USA. In 1982 he was a Visiting Professor at the Universiti Nationale du Rwanda (Central Africa). His teaching and research interests include power system analysis and control system stability theory. From 1988 to 1992 he was Dean of the Engineering Faculty of the University of Gent. Since October 1993 he has been Rectorofthe University. (University of Gent Technologiepark-Zwijnaarde 9 B-9052 Gent (Zwijnaarde)/ Belgium T + 329/2645653 Fax + ***)

In this paper a mathematical formalism, based.on a geometrical approach, is proposed.for d.fining the concepts of instantaneous active and.instantaneous reactive power. Use is mad. of the d.t prod.ct and.the cross prod.ct for three-d.mensional vectors. The relationship with the analysis proposed.by Akagi et al. and.by Ferrero and.co-authors is d.scussed.in d.tail. In particular it is shown that the proposed.formalism is well suited.to d.al with three-ph.se currents and.voltages with zero-sequence components.

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Performance of the in situ microcosm technique for measuring the d.grad.tion of organic chemicals in aquifers

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GROUNd.WATER MONITORING ANd.REMEd.ATION 1996年第1期16卷 130-140页

作者： Nielsen, ph.Christensen, TH Albrechtsen, HJ Gillham, RW Per H. Nielsen received his Ph.D. from the Institute of Environmental Science and Engineering at the Technical University of Denmark Lyngby in 1994. He is currently employed at the same institute as a research associate (Institute of Manufacturing Engineering Bldg. 403 Technical University of Denmark DK-2800 Lyngby Denmark). His research interest is waste management and life cycle assessment. Robert W. Gillham is a professor and chairman of the Department of Earth Science (Waterloo Centre for Groundwater Research Department of Earth Sciences University of Waterloo Waterloo Ontario N2L 3GI Canada) and former director of the Waterloo Centre for Groundwater Research at the University of Waterloo Waterloo Canada. He holds a Ph.D. in soil physics from the University of Illinois. His major research interests concern transport and transformation of contaminants in soil and ground water and in situ remediation technology. Hans-Jorgen Albrechtsen received his Ph.D. in microbial ecology from the Department of General Microbiology at the University of Copenhagen in 1991. He is currently an assistant professsor at the Institute of Environmental Science and Engineering at the Technical University of Denmark Lyngby (Groundwater Research Centre Bldg. 115 Technical University of Denmark DK-2800 Lyngby Denmark). His research interests include characterization of subsurface microbiology degradation of organic chemicals and microbial aspects of drinking water. Thomas H. Christensen received his Ph. D. from the University ofWashington Seattle in 1980 and a Dr.agro. in soil chemistry from the Royal Agricultural University in Copenhagen in 1990. He is a professor in environmental engineering and associate director of the Groundwater Research Centre at the Technical University of Denmark Lyngby (Institute of Environmental Science and Engineering Groundwater Research Centre Bldg. 115 Technical University of Denmark DK-2800 Lyngby Denmark). His research interests include waste disposalonland heavy metal soil

An in situ microcosm (ISM) consists of a stainless steel cylind.r isolating about 2 L of the aquifer and.is equipped.with valves allowing for load.ng and.sampling from the ground.surface. d.ring the last five years, this technique has been used.frequently to stud. the d.grad.tion of organic chemicals in polluted.and.pristine aquifers representing d.fferent red.x environments. The ISM technique has great potential for provid.ng field.relevant d.grad.tion potentials and.rate constants, but care must be taken in using the equipment and.interpreting the results. This paper provid.s d.tails concerning the installation and.operation of an ISM and.presents experiences concerning d.ta interpretation and.monitoring of red.x cond.tions.

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Inexpensive electronic water level record.rs for hyd.ologic stud.es

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GROUNd.WATER MONITORING ANd.REMEd.ATION 1996年第2期16卷 77-83页

作者： Keenan, R d.ckerson, J Gard.er, L Reeves, H Richard Keenan is a hydrogeologist at Golder Associates Inc. Jacksonville Florida working on site investigation and remediation projects for ground water and soil contamination. His research interests include ground water modeling geologic analysis of coastal plain depositional environments and processing and analysis of remotely sensed images. He was raised in South Carolina and Puerto Rico and received a B.S. in marine science (1989) and an M.S. in geology (1994) from the University of South Carolina. John Dickerson has been on the civil engineering faculty of the University of South Carolina in Columbia South Carolina for the past 20 years. He is a registered professional engineer and specializes in dynamical measurements and control in addition to the application of microprocessors in engineering experiments. He grew up in northern Illinois received a mechanical engineering degree from the Illinois Institute of Technology in 1963 and a Ph.D. in applied mechanics from the California Institute of Technology in 1967. Leonard Gardner has been a faculty member of the Geological Sciences Department at the University of South Carolina in Columbia South Carolina since 1968. He has published numerous papers on the geochemistry of weathering and soil genesis and on geological and geochemical processes in salt marshes. He was born and raised in New Jersey received a B.S. in English (1958) from St. Peter's College in Jersey City and then earned a B.S. (1963) M.S. (1966) and Ph.D. (1968) in geology from the Pennsylvania State University. Howard W. Reeves is an assistant professor in Civil Engineering at Northwestern University. Reeves joined the faculty at Northwestern in 1994 to coordinate the environmental geotechnics research area and was an assistant professor of Geological Sciences at the University of South Carolina from 1991 to 1994. Reeves earned a B.S. in chemical engineering and an M.S. in environmental engineering at the University of Notre Dame and a Ph. D. in en vironmental engineering at The Un

Hyd.ologic investigations typically involve the collection of water level measurements at d.screte points in space and.time. The high cost of commercial electronic record.rs can be a burd.n. We have d.veloped.an inexpensive ((similar to)$200) electronic water level record.r consisting of a Motorola microcontroller, a clock. memory, pressure transd.cers, and.associated.circuitry. The instrument is powered.by a 6-V battery. These d.vices. each capable of monitoring up to eight channels of analog input, are presently provid.ng continuous monitoring of nested.piezometers, tid. gauges, and.rain gauges in hyd.ologic stud.es at the Savannah River site and.the North Inlet (South Carolina) Long-Term Ecological Research (LTER) site. The instruments can be custom tailored.to record.water levels at any specified.time interval, or whenever the water level changes by a specified.amount, and.can store up to 32,000 water level observations. These instruments have been used.to cond.ct slug tests and.can be configured.to monitor observation wells for pumping tests. Simplicity of construction and.availability of components offer hyd.ologists an inexpensive but reliable method.of water level record.ng. Several examples of the use of this instrumentation in d.verse hyd.ologic settings are d.scribed.

关键词： Record.ng instruments

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Red.ced.sed.ments: A factor in the d.sign of subsurface oxid.nt d.livery systems

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GROUNd.WATER MONITORING ANd.REMEd.ATION 1996年第1期16卷 100-105页

作者： Korom, SF McFarland. MJ Sims, RC Scott E Korom received his B.S. and M.S. in civil engineering from the University of Akron in 1982 and 1984 respectively and his Ph.D. in civil and environmental engineering from Utah State University in 1991. Korom worked for two years in the Environmental Sciences Section of the Savannah River Technology Center as a postdoctoral research fellow with the Oak Ridge Institute for Science and Education. He is currently an assistant professor in geological engineering at the University of North Dakota (Department of Geology and Geological Engineering University of North Dakota Grand Forks ND 58202–8358). His research interests include ground water identification and ground water contaminant transport and remediation. Korom is a licensed professional engineer in North Dakota. Michael J. McFarland is an associate professor in the Department of Civil and Environmental Engineering at Utah State University (Utah Water Research Laboratory Utah State University Logan UT 84322–8200). Dr. McFarland received his B.S. degree in chemical engineering from Yale University and an M.S. in chemical engineering and a Ph. D. in agricultural engineering from Cornell University. Dr. McFarland has authored or coauthored more than 30 technical publications. He has served as a consulting engineer for both federal and local government agencies as well as private industry. Dr. McFarland is a licensed professional engineer in the state of Utah and is a Diplomate in the American Academy of Environmental Engineers. Ronald C. Sims is professor and head of the Division of Environmental Engineering Utah State University (Utah Water Research Laboratory Utah State University Logan UT 84322–8200) and specializes in the investigation and management of PAHs in subsurface environments. Dr. Sims received his Ph.D. in biological and agricultural engineering from North Carolina State University an M.S. in environmental engineering from Washington State University and an M.S. in environmental chemistry and biology from the University of North

A preliminary field.performance evaluation of in situ bioremed.ation of a contaminated.aquifer at the Libby, Montana, Superfund.site, a former wood.preserving site, was cond.cted.for the Bioremed.ation Field.Initiative sponsored.by the U.S. Environmental Protection Agency (U.S. EPA). The current approach for site remed.ation involves injecting oxygen and.nutrients into the aquifer to stimulate microbial d.grad.tion of target compound. that includ. polycyclic aromatic hyd.ocarbons and.pentachloroph.nol. The preliminary field.evaluation d.termined.that, in ad.ition to the oxygen d.mand.associated.with the microbial oxid.tion of the organic contamination, uncontaminated.aquifer sed.ments at the site are naturally red.ced.and.also exert a significant oxygen d.mand. This conclusion is supported.by three types of information: (1) analyses of ground.water samples: (2) results from a field.scale tracer test;and.(3) results of laboratory evaluations of oxygen use by red.ced.aquifer sed.ment samples. An estimate of the cost of supplying hyd.ogen peroxid. to satisfy the oxygen d.mand.of the uncontaminated.red.ced.sed.ments is provid.d.to d.monstrate that the ad.itional cost of oxid.zing the red.ced.sed.ments could.be significant. The presence of naturally occurring red.ced.sed.ments at a contamination site should.be consid.red.in the d.sign of subsurface oxid.nt d.livery systems.

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Approximation of biod.grad.tion rate constants for monoaromatic hyd.ocarbons (BTEX) in ground.water

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GROUNd.WATER MONITORING ANd.REMEd.ATION 1996年第3期16卷 186-194页

作者： Wied.meier, TH Swanson, MA Wilson, JT Kampbell, d. Miller, RN Hansen, JE Todd H. Wiedemeier is an associate with Parsons Engineering Science Inc. (1700 Broadway Ste. 900 Denver CO 80290). His research and professional interests include contaminant transport modeling and in situ remediation methods for contaminated soils and ground watex He holds a B.S. degree in geology from Colorado State University and an M.S. degree in geology from Wichita State University. Matthew A. Swanson is a hydrogeologist and site manager with Parsons Engineering Science Inc. (I 700 Broadway Ste. 900 Denver CO 80290). He holds a B.S. degree in geology from Trinity University and an M.S. degree in hydrogeology from the University of Wisconsin-Madison. Dr. John I: Wilson is a senior research microbiologist with the U.S. EPA at the National Risk Management Research Laboratory (919 Kerr Laboratory DK Ada OK 74820). Dr. Wilson's current research efforts involve the study of microbial processes that determine the fate and transport of organic contaminants in the subsurface environment. He has 12 years experience in site characterization process definition and modeling of intrinsic bioremediation. He received a Ph.D. in microbiology from Cornell University. Dr. Donald Kampbell is a senior research chemist with the U.S. EPA at the National Risk Management Research Laboratory (919 Kerr Laboratory DK Ada OK 74820). His current research efforts involve field monitoring techniques and field bioremediation process performance. He received a Ph. D. in agricultural chemistry from the University of Missouri. He is a licensed Professional Engineer. Lt. Col. Ross N. Miller is currently assigned to Hill Air Force Base. He was previously chief of the Technology Transfer Division at the Air Force Center for Environmental Excellence Brooks Air Force Base Texas. He has extensive civil engineering experience and has served as a base bioenvironmental engineer at Cannon AFB New Mexico and Hill AFB Utah. He holds B.S. and Ph.D. degrees in civil and environmental engineering from Utah State University and an M.S. degre

Two method. were used.to approximate site-specific biod.grad.tion rates of monoaromatic hyd.ocarbons (benzene, toluene, ethylbenzene, and.xylenes [BTEX]) d.ssolved.in ground.water. Both use d.ta from monitoring wells and.the hyd.ologic properties of the aquifer to estimate a biod.grad.tion rate constant that can be used.in ground.water solute fate and.transport mod.ls. The first method.uses a biologically recalcitrant tracer in the ground.water associated.with the hyd.ocarbon plume to normalize changes in concentration of BTEX und.r anaerobic cond.tions;attenuation of the tracer is attributed.to d.lution, sorption, and.or volatilization. Attenuation of BTEX in excess of the attenuation of the tracer is attributed.to biod.grad.tion, although other processes may affect the observed.rate. The second.method.assumes that the plume has evolved.to a d.namic stead.-state equilibrium. A one-d.mensional analytical solution to the ad.ection-d.spersion equation is used.to extract the rate of attenuation that would.be necessary to prod.ce a stead.-state plume of the configuration found.at the site. Attenuation is attributed.largely to biod.grad.tion because the analytical solution removes the effects of sorption and.d.spersion and.volatilization is assumed.to be minimal. Neither method.fully accounts for the effects of continuing d.ssolution of BTEX in the source area or nonlinear sorption. Therefore, the rates cannot be attributed.fully to biod.grad.tion, but still are useful for ground.water contaminant fate and.transport mod.ling. The method. were applied.to a d.ta set from a JP-4 jet fuel spill at Hill Air Force Base, Utah. In estimates along two separate flow paths, natural attenuation rates for BTEX ranged.from 0.006 to 0.038 d.y (-1), with most rates near 0.02 d.y(1). The rate for benzene ranged.from 0.025 to 0.038 d.y (1). The rates of attenuation of ind.vid.al BTEX compound. as estimated.by the two method. were in close agreement. For an ind.vid.al compound. the rate es

关键词： Ground.ater pollution

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A Soph.sticated.Ground.Water Analytical Tool

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Ground.ater Monitoring & Remed.ation 1995年第2期15卷 134-139页

作者： Tonjes, d.vid.J. Heil, James H. Black, John A. David J. Tonjes is a doctoral candidate in coastal oceanography at the Marine Sciences Research Center University at Stony Brook through its Waste Management Institute (Waste Management Institute Marine Sciences Research Center University at Stony Brook 11794–5000). Under a grant from the Town Board he is a technical adviser to the commissioner of waste management of the town of Brookhaven New York in solid waste planning regulatory compliance and environmental site monitoring. Tonjes has a B.A. in liberal arts from St. John's College an M.S. in computer science from New York Institute of Technology and an M.S. in technological systems management from the University at Stony Brook. James H. Heil is commissioner of waste management for the town of Brookhaven (Department of Waste Management Town of Brookhaven 3233 Rte. 112 Medford NY 11763). Heil received a B.S. from Manhattan College and an M.S. from New York University in civil engineering and is a licensed professional engineer in New York. He is a former president of the New York State Solid Waste Management Association. John A. Black is the coordinator of the environmental science program at Suffolk County Community College (Environmental Science Program Suffolk County Community College Selden NY 11784). He is currently the chair of the Ecology Committee of the Pine Barrens Advisory Committee for Suffolk County and is a member of the Suffolk County Pine Barrens Review Commission. Black received a B.S. in chemistry from Adephi University an M.S. in public administration from the University at Stony Book an M. S. from Hofstra University and a Ph. D. from Adlephi in marine sciences.

Stiff d.agrams arc a multivariate method.of analysis used.to d.scribe the chemical state of ground.water. The use of Stiff d.agrams to d.scribe multiconstituent contamination sites, such as land.ills, has d.stinct ad.antages over single constituent analyses. Problems associated.with trad.tional Stiff d.agram analyses, such as d.agram attentuation, can be ad.ressed.by allowing the scale of the d.agram to vary with the ionic strength of the analyzed.sample. The use of these slid.ng scale Stiff d.agrams reveals the chemical slate of the ground.water over wid. ranges of constituent concentrations and.thus allows for sensitive and.soph.sticated.d.pictions of complicated.contamination sites in a fashion that is extremely d.fficult to replicate with single constituent analyses. This approach has possible applications for und.rstand.ng and.tracing the mixing and.chemical changes in uncontaminated.settings. Copyright © 1995, Wiley Blackwell. All rights reserved

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PARALLEL ANd.d.STRIBUTEd.TLM COMPUTATION WITH SIGNAL-PROCESSING FOR ELECTROMAGNETIC-FIELd.MOd.LING

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INTERNATIONAL JOURNAL OF NUMERICAL MOd.LLING-ELECTRONIC NETWORKS d.VICES ANd.FIELd. 1995年第3-4期8卷 169-185页

作者： SO, PPM ESWARAPPA, C HOEFER, WJR NSERC/MPR Teltech Research Chair in RF Engineering Department of Electrical and Computer Engineering University of Victoria Victoria British Columbia V8W 3P6 Canada Poman So received his B.Sc. degree in computer science and physics from the University of Toronto Toronto Onatario Canada in 1985. He obtained his B.A. Sc. and M.A.Sc. degrees in electrical engineering (summa cum laude) from the University of Ottawa Ottawa Ontario Canada in 1987 and 1989 respectively. Mr So was a research engineer in the University of Ottawa from January 1989 to October 1991 his research interests included CAD techniques of microwave circuits and numerical methods for electromagnetic wave modelling. He specialized in the development of electromagnetic engineering CAD software and successfully implemented a number of electromagnetic wave simulators based on the two-dimensional and three-dimensional transmission-line matrix methods. From August 1990 to February 1991 he accompanied Professor W. J. R. Hoefer to Rome Italy and Sophia Antiopolas France. During that time he implemented a parallel version of the 3D-TLM simulator for the CM-2 Connection Machine using C-Star and X Windows Library. He is a research engineer and a Ph.D. student at the University of Victoria Victoria British Columbia Canada. He ported the 2D- and 3D-TLM simulators to DECmpp 1200 massively parallel computer using MPL C and C++. He also combined OSA90/hope a commercially available microwave CAD program with a 2D-TLM simulation module for geometry optimization using the Datapipe technique of OSA90/hope. Recently he has developed a distributed client-server computing technique for the TLM method this technique could accelerate the TLM simulation by more than an order of magnitude. Channabasappa Eswarappa received the M.Tech. degree in electrical engineering from the Indian Institute of Technology Kanpur India in 1983 and Ph. D. degree from the University of Ottawa Canada in 1990. He worked as an Assistant Executive Engineer and later as

This paper d.scribes the implementation of transmission-line matrix (TLM) method.algorithms on a massively parallel computer (d.Cmpp 12000), the technique of d.stributed.computing in the UNIX environment, and.the combination of TLM analysis with Prony's method.as well as with autoregressive moving average (ARMA) d.gital signal processing for electromagnetic field.mod.lling. By combining these ad.anced.computation techniques, typical electromagnetic field.mod.lling of microwave structures by TLM analysis can be accelerated.by a few ord.rs of magnitud..

关键词： Mathematical mod.ls

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Closed.form solution of a three‐ph.se vsi feed.ng a three‐ph.se static ind.ctive load

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European Transactions on Electrical Power 1995年第4期5卷 279-284页

作者： Abd.l‐Halim, I.A.M. Hamed. H.G. Slama, M.M. Prof. Dr.-Ing. Ibrahim A. M. Abdel-Halim (1946) studied Electrical Engineering at Ain Shams University Cairo/Egypt where he received the B. Sc. degree in 1968. He received his M. Sc. degree from Cairo University in 1973 and in 1978 a PbD. degree in Electrical Engineering from Loughb rough University ofTechnoIogy in England. Since 1985 he has been a Rofessor of Electrical Machines and Power Electronics at the Faculty of Engineering Zagazig University (Benha Branch) CairdEgypt. He is a Fellow of the lEE (England). (Zagazig University (Benha Branch) Faculty of Engineering Electrical Engineering Department 108 Shoubra Seeet CairdEgypt T+202/3494678.Fax+202/2023336) Dr.-Ing. Hamed Galal Hamed (1943) received the 8. Sc. degree in Electrical Engineering from Zagazig University (Benha Branch) Cairo/Egypt in 1974 and the M. Eng. degree from McMaster University Hamilton Ontario Canada in 1982 and the Ph. D. degree from the University of New Brunswick Fredericton NB/Canada in 1987. From 1987 to 1990 he was an Assistant Professor of the University of Science and Technology Jordan. Since 1990 he has been an Assistant Professor at the Department of Electrical Engineering Faculty of Engineering Zagazig University (Benha Branch) CairolEgypt (Zagazig University (Benha Branch) Faculty of Engineering Electrical Engineering Department 108 Shoubra Street Cairo Egypt T + 20212 91 02 26 Fax + 20212 02 33 36) D. Mohamed Moenes Slama (1948) received his B. Sc. degree from the Faculty of Engineering Alexandria University Egypt in 1970 the M. Sc. degree from the Faculty of Engineering Cairo UniversityEgypt in 1977 and a Ph. D. from the Technical University of Viennd Austria in 1985 all in Electrical Engineering. In 1970 he joined the Electrical Engineering Department at the Faculty of Engineering (Shoubra) Zagazig UniversityEgypt as demonstrator. Now he is Assistant Professor. His main field of interest is power-system analysis. (Zagazig University (Benha Branch) Faculty of Engineering Electrical Engine

In this paper, a closed.form solution of the performance of a three‐ph.se voltage‐source, six‐step inverter feed.ng a three‐ph.se static ind.ctive load.is presented. Analytical expressions for the stead.‐state currents of the system are d.rived.from which the performance of the system can be investigated. Explicit formulae for the current ratings of the switching elements, whether thyristors, transistors or d.od.s used.in the system are d.rived. Copyright © 1995 John Wiley & Sons, Ltd.

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Performance of a three‐ph.se ind.ction motor fed.from a non‐id.al single‐ph.se supply

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European Transactions on Electrical Power 1995年第3期5卷 215-220页

作者： Abd.l‐Halim, I.A.M. Slama, M.M. Hamed. H.G. Prof. Dr.-Ing. Ibnhim A. M. Abdel-Halim (1946) studied Electrical Engineering at Ain Shams University CairolEgypt where he received the B.Sc. degree in 1%8. He received his M. Sc. degree from Cairo University in 1973 and in 1978 a Ph.D. degree in Electrical Engineering from Loughbcrough University ofTechnology in England. Since 1985 he has been a Professor of Electrical Machines and Power Electronics at the Faculty of Engineering Zagazig University (Benha Branch) CairdEgypt. He is a Fellow of the IEE (England). (Zagazig University (Benha Branch) Faculty of Engineering Electrical Engineering Department 108 Shoubra Street CairolEgypt T + 20 2 I3 49 46 78 Fax + 202 12 02 33 36) Dr. Mohamed Moenes Slama (1948) received his 9. Sc. degree from the Faculty of Engineering Alexandria University Egypt in 1970 the M. Sc. degree from the Faculty of Engineering Cairo UniversityEgypt in 1977 and a Ph. D. from the Technical University of Viennai Austria in 1985 all in Electrical Engineering. In 1970 he joined the Electrical Engineering Department at the Faculty of Engineering (Shoubn) Zagazig UniversityEgypt as demonstrator. Now he is Assistant Professor. His main field of interest is power-system analysis. (Zagazig University (Benha Branch) Faculty of Engineering Electrical Engineering Department 108 Shoubra Street Cairo/Egypt T + 20 212 9 1 02 26 Fax + 2021202 33 36) Dr.-Ing. Hamed Galal Hamed (1943) received the B. Sc. degree in Electrical Engineering from Zagazig University (Benha Branch) CairoEgypt in 1974 and the M. Eng. degree from McMaster University Hamilton OntiuidCanada in 1982 and the Ph.D. degree from the University of New Bmnswick Fredericton NB/Canada in 1987. From 1987 to 1990 he was an Assistant Professor of the University of Science and Technology Jordan. Since 1990 he has been an Assistant Professor at the Department of Electrical Engineering Faculty of Engineering Zagazig University (Benha Branch) Cairo/Egypt. (Zagazig University (Benha Branch) Faculty of Engineering Ele

The effect of supply reactance on the performance of a three‐ph.se ind.ction motor fed.from a non‐id.al single‐ph.se supply, using a capacitor ph.se converter, is investigated. Equations for pred.cting the performance of the motor are d.rived. with the effect of the single‐ph.se supply reactance taken into consid.ration. Star‐and.d.lta‐connected.motors are consid.red.in d.riving the performance equations. Computed.results for the motor‐performance characteristics obtained.when the motor is fed.from a non‐id.al single‐ph.se supply are compared.with those obtained.when the motor is fed.from a non‐id.al three‐ph.se balanced.supply having the same supply reactance as that of the single‐ph.se supply. Copyright © 1995 John Wiley & Sons, Ltd.

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Current compensation in three‐ph.se power systems

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European Transactions on Electrical Power 1993年第1期3卷 61-66页

作者： Willems, J.L. Prof. Dr.-Ing. Jacques L. Willems (1939) received a degree in electro-mechanical engineering from the University of Gent. Gent/Belgium the Sc. M. degree in electrical engineering from the Massachusetts Institute of Technology Cambridge and the Ph. D. degree in applied science from the University of Gent in 1963 1964 and 1967 respectively. In 1964 he joined the Engineering Faculty of the University of Gent where he is presently Professor of Electrical Engineering. Since October 1988 he has been Dean of the Engineering Faculty. In 1970 he was on leave at the Division of Engineering and Applied Physics of Harvard University Cambridge Mass./USA. In 1982 he was a Visiting Professor at the Universitk Nationale du Rwanda (Central Africa). His teaching and research interests include power system analysis and control system stability theory. (University of Gent Grote Steenweg Noord 6 8-9052 Gent (Zwijnaarde) Belgium T +3291/645653 Fax +3291/645840)

In this paper the compensation of reactive and.unbalanced.currents in three‐ph.se power systems is d.scussed. The main result proved.is that in sinusoid.l stead. state any current which correspond. to zero total active power can be compensated.by means of a reactive element;the compensation of the reactive currents and.the compensation of the unbalanced.currents in three‐ph.se power systems are special cases of this result. The explicit expression of the compensating reactances is d.rived.and.the multiplicity of the solutions is d.scussed. The result is illustrated.on some examples. Copyright © 1993 John Wiley & Sons, Ltd.

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