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Simple robust adaptive control of static VAR compensator

European Transactions on electrical Power 1993年第6期3卷 429-435页

作者： Machowski, J. Nelles, D. Jan Machowski (1950) received the M.Sc. degree in Electrical Faculty of Warsaw University of Technology in 1974. For two years he was employed in the Power Dispatching Centre in Warsaw/Poland. Later after gaining some field experience in several power plants he did a postgraduate study at Warsaw University of Technology where he received his Ph.D. degree in 1979. In the same year he joined the Electrical Faculty of Warsaw University of Technology where he is presently employed as a professor and head of the power system protection and control group. His areas of interest are power systems analysis protection and control. Since October 1989 he has been with Kaiserslautem University/Germany. (Univ. Kaiserslautern FB Elektrotechnik. P.O. Box 30 49 67618 Kaiserslautem T +4963/205-3431 Fax +49631/205-21 68) Dieter Nelles (1939). VDE received the Dipl.-Ing. degree in electrical engineering in 1966 from the Technical University in Darmstadt/Germany and the Dr.-Ing. degree in 1973 from the Technical University of Berlird/Germany. Since 1966 he has been with the Technical and Science Department of AEG-Telefunken (Frankfurt/M Germany) as a research engineer and since 1972 as the head of this department. In 1982 he joined the Electical Faculty of Kaiserslautem University where he presently is il professor of eletrical engineering and head of the Electrical Energy Supply Group. His special areas of interest are powersystem stability. power system protection and power system control. He is a member of VDE and serves as the chairman of Synchronous Machines Regulation and Excitation Systems Committee. (Univ. Kaisers-lautem FB Elektrotechnik. P.O. Box 304967618 Kaiserslautem T +49631/205-28 46 Fax +49631/205-21 68)

A study of power system transient stability enhancement through effective use of static VAR compensator is presented. It is shown that optimal state‐variable control can be approximately realized as a simple closed‐loop control based on locally measurable electric quantities. In order to make this regulation more effective and insensitive to the changes of the network parameters and loading condition it is proposed to use simple adaptive control with dynamic gain tuned by additional control loops. Tests done for two‐machine and multi‐machine systems have confirmed the validity and robustness of the proposed control method. Copyright © 1993 John Wiley & Sons, Ltd.

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A HYBRID-MODE BOUNDARY INTEGRAL-EQUATION METHOD FOR NORMALCONDUCTING AND SUPERCONDUCTING TRANSMISSION-LINES OF ARBITRARY CROSS-SECTION

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INTERNATIONAL JOURNAL OF MICROWAVE AND MILLIMETER-WAVE COMPUTER-AIDED engineering 1992年第4期2卷 314-330页

作者： SCHROEDER, W WOLFF, I Department of Electrical Engineering and Sonderforschungsbereich 254 Duisburg University Bismarckstrasse 81 D-4100 Duisburg 1 Germany Werner L. Schroeder was born in Recklinghausen Germany on July 12 1954. After an apprenticeship as an electrician he collected several years of practical experience in industry before it drew him to study electrical engineering. He obtained his Dipl.-Ing degree from the University of Duisburg Germany in 1986. He then joined the Special Research Program. “Very High Frequency and Very High Speed Circuits based on III-V-Compound Semiconductors” at the Faculty of Electrical Engineering University of Duisburg where he worked on Monte Carlo simulation of electrical transport in III-V compounds and devices numerical modeling of MMIC transmission-line structures and on the explanation of the spurious mode phenomenon in numerical solutions of electromagnetic field eigenvalue problems. He is currently with the Department of Electromagnetic Theory and Engineering working on fullwave boundary integral analysis of general waveguiding structures which is also the subject of his dissertation.

A space domain Boundary Integral Equation (BIE) method for full-wave analysis of general waveguide is presented. The method is demonstrated to be applicable to arbitrary shielded or unshielded waveguide cross-sections ranging from optical waveguide to MMIC transmission lines. It allows for arbitrary isotropic complex media including normal (imperfect) conductors and superconductors as is demonstrated with full-wave loss analysis of coplanar stripline and several thin-film microstrip line configurations employing Au and YBCO conductors. An outline of the theory of the BIE method is given. The implications of nonsmooth boundary curves are considered, and special attention is given to the reliability of the method in being free of spurious solutions.

关键词： Waveguides

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Local convergence of 'globally convergent' blind adaptive equalization algorithms

Local convergence of 'globally convergent' blind adaptive eq...

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International Conference on Acoustics, Speech, and Signal Processing (ICASSP)

作者： Z. Ding C.R. Johnson R.A. Kennedy Department of Electrical Engineering Aubum University Auburn AL USA School of Electrical Engineering Cornell University Ithaca NY USA Department of System Engineering RSPhysSE and Interdisciplinary Engineering Program Faculty of Science Australian National University Canberra ACT Australia

It is shown, through the analysis of nullspace for the channel convolution matrix, that the behavior of a finitely parameterized Godard equalizer in general can never achieve or approximate the desirable global convergence performance of an infinitely parameterized noncausal Godard equalizer. Nullspace theory is supported by a simple example showing ill-convergence of the Godard algorithm.< >

关键词： Convergence Blind equalizers Adaptive equalizers Intersymbol interference Quadrature amplitude modulation Information science Australia Council Algorithm design and analysis Constellation diagram Noise robustness

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An approach to blind equalization of non-minimum phase systems

An approach to blind equalization of non-minimum phase syste...

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International Conference on Acoustics, Speech, and Signal Processing (ICASSP)

作者： W.A. Sethares R.A. Kennedy Z. Gu Department of Electrical and Computer Engineering University of Wisconsin Madison WI USA Department of System Engineering RSPhysSE and Interdisciplinary Engineering Program Faculty of Science Australian National University Canberra ACT Australia

Blind equalization of systems which contain a nonminimum phase component is a difficult task. Minimizing the energy (l/sub 2/ minimization) of the equalizer output (under a fixed tap constraint) cannot be guaranteed to open the eye (to reliably unscramble the message) because it tends to converge to an equalizer setting that contains a reflection of the unstable zeros inside the unit circle. It is shown that, in at least one simple setup involving a mixture of minimum and nonminimum phase elements, an l/sub infinity / minimization of the equalizer output is the appropriate criterion which should be minimized in order to successfully open the eye. Utilizing a finite impulse response equalizer constrained to have a unity coefficient on the center tap, it is shown that for a large enough dimension (depending on the closeness of the zeros of the channel to the unit circle) the eye will be opened. There is no simple (gradient) scheme to exactly implement the l/sub infinity / minimization. The use of a gradient l/sub p/ scheme for large p is proposed.< >

关键词： Blind equalizers Finite impulse response filter Australia Council Information science Predistortion Distortion Cellular neural networks Quadrature amplitude modulation Stability

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A METHOD FOR ASSESSING RESIDUAL NAPL BASED ON ORGANIC-CHEMICAL CONCENTRATIONS IN SOIL SAMPLES

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GROUND WATER MONITORING AND REMEDIATION 1991年第2期11卷 128-136页

作者： FEENSTRA, S MACKAY, DM CHERRY, JA Stan Feenstra is a hydrogeochemist and president of Applied Groundwater Research Ltd. in Mississauga Ontario He received a B.Sc. in earth sciences and an M.Sc. in hydrogeology from the University of Waterloo in 1978 and 1980 respectively and was designated a Certified Ground Water Professional by AGWSE in 1989. Since 1980 he has been a ground water consultant with Golder Associates in Mississauga Ontario and Zenon Environmental in Burlington Ontario and founded Applied Groundwater Research Ltd. in 1987. Feenstra specializes in the hydrogeochemical evaluation of ground water contamination at waste disposal facilities and chemical spill sites. He is currently a Ph.D. candidate in hydrogeology and research associate in the Waterloo Centre for Ground Water Research at the University of Waterloo (Waterloo Ontario N2L 3G1) and is involved in research related to the behavior of dense organic solvents in ground water. Douglas M. Mackay is an adjunct professor at the Waterloo Centre for Groundwater Research at the University of Waterloo Waterloo Ontario (N2L3G1). Dr. Mackay received a B.S. in engineering and M.S. and Ph.D. in civil engineering from Stanford University in 1970 1973 and 1981 respectively. From 1986 to 1990 he was a faculty member of the Environmental Science and Engineering Program of the UCLA School of Public Health. His research focuses on field studies of transport and fate of organic chemicals in ground water various scale studies of decontamination of soil and ground water and ground water monitoring technologies. John A. Cherry is a professor at the Waterloo Centre for Groundwater Research at the University of Waterloo Waterloo Ontario (N2L 3G1). He received his B.S. in geological engineering from the University of Saskatchewan in 1962. He received his M.S. from the University of California at Berkeley in 1964 and his Ph.D. from the Department of Geology at the University of Illinois in 1966. His research interests include the field study and modeling of contaminants in ground wat

Ground water contamination by non-aqueous phase liquid (NAPL) chemicals is a serious concern at many industrial facilities and waste disposal sites. NAPL in the form of immobile residual contamination, or pools of mobile or potentially mobile NAPL, can represent continuing sources of ground water contamination. In order to develop rational and cost-effective plans for remediation of soil and ground water contamination at such sites, it is essential to determine if non-aqueous phase liquid (NAPL) chemicals are present in the subsurface and delineate the zones of NAPL contamination. The presence of NAPL pools may be evident as a floating or sinking phase in monitoring wells. The residual NAPL contamination may be identified in soil samples if residual contents are high and contaminated zones in the soil cores are thick. However, visual identification may not be effective if residual contents ar elow or if the NAPL residual is distributed heterogeneously in the samples. The chemical analysis of soil samples provides a measure of the total chemical concentration in the soil but cannot determine directly whether NAPL is present in the samples. Qualitatively, soil analyses that exhibit chemical concentrations in the percent range or > 10,000 mg/kg would generally be considered to indicate the presence of NAPL. However, the results of soil analyses are seldom used in a quantitative manner to assess the possible presence of residual NAPL contamination when chemical concentrations are lower and the presence of NAPL is not obvious. The assessment of the presence of NAPL in soil samples is possible using the results of chemical and physical analyses of the soil, and the fundamental principles of chemical partitioning in unsaturated or saturated soil. The method requires information on the soil of the type typically considered in ground water contamination studies and provides a simple tool for the investigators of chemical spill and waste disposal sites to assess whether soil

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RUDDER ROLL STABILIZATION FOR COAST GUARD CUTTERS AND FRIGATES

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NAVAL ENGINEERS JOURNAL 1983年第3期95卷 267-282页

作者： BAITIS, E WOOLAVER, DA BECK, TA Dr. Erich Baitis: a native of Germany came to the David W. Taylor Naval Ship Research and Development Center in 1957 as a co-operative student/trainee and received his Bachelor of Science Degree in Physics from Virginia Polytechnic Institute. As a 32-year-old naval architect in 1971 he received both the VietnamHonorServiceMedaland the Navy'sMeritoriousCivilianServiceAwardfor his eight months as liaison with the Vietnamese NAVVS ferro-cement ship program. As head of the Seakeeping and Stabilization Group of the Surface Ship Dynamics Branch his work has led to the development of a new standard Ship Motion Computer Program and the application of ship motions to ship habitability operability and survivability problems. A major area of this work has been the ship/aircraft interface which is particularly sensitive to ship motions wind and other environmental factors. Mr. Dennis A. Woolaver:has been employed as a Naval Architect at the David W. Taylor Naval Ship Research and Development Center since 1965 where his work has resulted in numerous patents. He received his Bachelor of Science Degree in Electrical Engineering from George Washington University where he also completed graduate work in Communication Theory. Additional fields of study include Computer Science and Personnel Management. Current efforts are directed toward surface ship motion mitigation data acquisition and statistical analysis. He is a member of the Society of Naval Architects and Marine Engineers. Lt. Tom A. Beck USCG: joined the UnitedStatesCoastGuardin 1966 where he trained as an Electronics Technician. He received a Bachelor of Science Degree in Electrical Engineering from Columbia University in 1978. From 1978 to 1979 he was an Electronics Project Officer at the CoastGuardElectronics Laboratory in Alexandria Virginia. Since 1980 he has been a Research and Development Project Officer in the Sensor Technology Branch of the CoastGuardsOffice of Research and Development. Lt. Beck is a member of the Institute of Electronic and Elect

The potential use of rudders as anti-roll devices has long been recognized. However, the possible interference of this secondary function of the rudder with its primary role as the steering mechanism has prevented, for many years, the development of practical rudder roll stabilizers. The practical feasibility of rudder roll stabilization has, however, in recent years been demonstrated by two systems designed and developed for operational evaluation aboard two different U.S. C oast G uard Cutters, i.e., Jarvis and Mellon of the 3,000-ton, 378-foot HAMILTON Class. The authors describe the major components of the rudder roll stabilization (RRS) system, along with the design goals and methodology as applied to these first two prototypes. In addition, a brief history of the hardware development is provided in order to show some of the lessons learned. The near flawless performance of the prototypes over the past four years of operational use in the North Pacific is documented. Results from various sea trials and reports of the ship operators are cited and discussed. The paper concludes with a discussion of the costs and benefits of roll stabilization achieved using both a modern anti-roll fin system, as well as two different performance level RRS systems. The benefits of roll stabilization are demonstrated by the relative expansion in the operational envelopes of the USS OLIVER HAZARD PERRY (FFG-7) Class. The varying levels of roll stabilization suggest that the merits of fins and RRS systems are strongly dependent on mission requirements and the environment. The demonstrated performance of the reliable RRS system offers the naval ship acquisition manager a good economical stabilization system.

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The Effects of Microwave Radiation, Hyperthermia, and L-Ascorbic Acid on Ehrlich Ascites Carcinoma Cell Metabolism

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IEEE Transactions on Microwave Theory and Techniques 1978年第8期26卷 535-540页

作者： Piontek, Gerald E. Cain, Charles A. Radiation Oncology Training Program post-doctoral fellow University of Illinois Urbana II United States Bioacoustics Research Laboratory Department of Electrical Engineering Bioengineering Faculty University of Illinois Urbana II United States Department of Food Science School of Basic Medical Sciences Universitv of Illinois Urbana II United States

The effects of microwave radiation, hyperthermia, and L-ascorbic acid on metabolism of (U_14C) glucose, (2-14°C) glucose, and (1,5-l4C) citrate in Ehrlich ascites tumor cells (EATC) were studied. Microwave irradiated and water bath incubated cells were maintained at the same temperature for comparison. Data were obtained at 37.5°C and 42.5°C in the presence or absence of L-ascorbic acld, Ascorbilc acid increased the rate of metabolism of both glucose and citrate. No significant differences in glucose and citrate metabolism were found between irradiated and nonirradiated cells at the same temperature and ascorbic acid concentration. A comparison of glucose metabolism in a normal tissue preparation and EATC was made. Vitamin C did not increase metabolism in the normal cell preparation. Copyright © 1978 by The Institute of electrical and Electronics Engineers, Inc.

关键词： Hyperthermia Biochemistry Electromagnetic heating Sugar Water heating Neoplasms Cancer Temperature Oncology

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DESIGN ASPECTS OF NEW SERD CATAPULT

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NAVAL ENGINEERS JOURNAL 1977年第1期89卷 55-67页

作者： BRACE, RL MCWADE, JE USN Capt. R.L. Brace: USN reported for active duty in the U.S. Naval Reserve in June 1945 and upon his release from active duty in 1948 entered Chaffey Junior College Ontario Calif. from which he received his Associate Degree in Engineering in June 1949. Subsequently he attended Purdue University from which he received his BS degree in Chemical Engineering in 1951 and while on a Westinghouse Research Fellowship his MS degree in Engineering in 1952. He joined Phillips Petroleum Co. in Oklahoma as a research engineer with the Jet Fuel Research Group upon receiving the latter degree and while so serving obtained 12 patents. In January 1955 he was recalled to active duty and reported to Officers Candidate School. Newport R.I. Upon being commissioned in the U.S. Naval Reserve in May of that year he began his flight training at the Naval Air Training Command ultimately being designated a Naval Aviator and augumented into the regular Navy in 1956. He served with four carrier-based attack squadrons including three combat tours and in 1962 completed a duty assignment with the U.S. Army in South Vietnam. Other assignments include Catapult and Arresting Gear Officer USS Enterprise (CVN-65) duty on the Staff. Commander Naval Air Force. U.S. Atlantic Fleet: Assistant Chief of Staff for Material Task Force 78 during the mine countermeasure operations in North Vietnam Officer-in-Charge. Fleet Air Western Pacific Repair Activity Cubi Point P.I.: and Head. Aircraft Launch and Recovery Equipments Branch Ship Installations Division. Naval Air Systems Command from 1974 to 1976 during which he had full responsibility for all shore-based and shipboard aircraft launching and recovery systems and was Acquisition Manager for the SERD Catapult Program. Capt. Brace who was designated an Aeronautical Engineering Duty Officer in 1964. is a graduate of the U.S. Navy Test Pilot School the Naval War College and the Defense Systems Management School and his military decorations include the Meritorious Service Award the Air Me

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Abstracts

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Environmental Management 1977年第1期1卷 67-96页

作者： Frankenfeld, John W. Schulz, Wolfgang McMurty, George J. Petersen, Gary W. May, G. A. Hering, F. S. Schwartz, J. I. Heywood, J. B. Chigier, N. A. Grohse, E. W. Walker, J. D. Colwell, R. R. Petrakis, L. Pergament, H. S. Thorpe, R. D. Schoepf, Richard W. Krzyczkowski, Roman Henneman, Suzanne S. Hudson, Charles L. Putnam, Evelyn S. Thiesen, Donna J. Parks, G. A. McCarty, Perry L. Leckie, J. O. Schrumpf, Barry J. Simonson, G. H. Paine, D. P. Lawrence, R. D. Pyott, W. T. Leh, M. Elders, W. Combs, J. Caplen, T. Harrison, F. L. Wong, K. M. Heft., R. E. Charnell, Robert L. Lehmann, Edward J. Mallon, Lawrence G. Hatfield, Cecile Adams, Gerald H. Johanning, James Talvitie, Antti Noll, Kenneth E. Miller, Terry Smiarowski, Joseph F. Willis, Cleve E. Foster, John H. Schlesinger, Benjamin Daetz, Douglas Lear, Donald U. Smith, Mona F. Hundemann, Audrey S. Crockett, Pernell W. Werner, Kirk G. Carroll, Thomas E. Maase, David L. Genco, Joseph E. Ifeadi, Christopher N. Lowman, F. G. Christensen, S. W. Van Winkle, W. Mattice, J. S. Harrison, Elizabeth A. Barker, James C. Chesness, Jerry L. Smith, Ralph E. Shaheeen, Donald G. Raney, R. Keith Borton, T. Wezernak, C. T. Raney, R. K. Sherwani, Jabbor K. Moreau, David H. Eisenberg, Norman A. Lynch, Cornelius J. Breeding, Roger J. Johnson, J. D. Foster, K. E. Mouat, D. A. Clark, R. Hyden, John William Owen, Wilfred Bayfield, Neil G. Barrow, Graham C. Stolz, Stephanie B. Wienckowski, Louis A. Brown, Betram S. Keyfitz, Nathan Wilson, W. L. Newman, Peter W. G. Bammi, Deepak Bammi, Dalip Goddard, James E. Chisholm, Tony Walsh, Cliff Brennan, Geoffrey Thompson, K. S. Richardson, R. Jensen, Clayton E. Brown, Dail W. Mirabito, John A. Cowing, Thomas G. Binghamton, Suny Siehl, George H. Albrecht, O. W. Alexander, Ariel Barde, Jean -Philippe Darby, William P. McMichael, Francis Clay Dunlap, Robert W. Muckleston, Keith W. Frankenhoff, Charles A. Giulini, Lorenzo T. Wyatt, T. Black, Peter E. Keating, William Thomas Leonard, M. E. Fisher, E. L. Brunelle, M. F. Dickinson, J. E. Pethig, Rudiger Clapham Exxon Research & Engineering Co. Linden Government Research Lab Coast Guard Washington D.C. Department of Transportation Washington D.C. Office For Remote Sensing of Earth Resources. NASA Earth Resources Survey Program Pennsylvania State University Washington D.C. Department of the Navy Washington D.C. Cambridge. Dept. of Mechanical Engineering Massachusetts Inst. of Technology USA Huntsville. School of Graduate Studies and Research Alabama Univ. USA Dept. of Microbiology. Office of Naval Research Maryland Univ. Arlington Research and Development Co. Pittsburgh AeroChem Research Labs. Inc. Princeton Dept. of the Interior Office of Library Services. Bibliographic Series (Final) Washington D.C. Interplan Corp. Santa Barbara Urban Mass Transportation Adm. Washington D.C. Naval Underwater Systems Center Newport Calif. Mercury Project. National Science Found Stanford Univ Washington D.C. Div. of Advanced Environmental Research & Tech. USA Corvallis. NASA Earth Resources Survey Program Oregon State Univ. Washington D.C. Riverside. Inst. of Geophysics and Planetary Physics National Science Foundation California Univ. Washington D.C. Livermore Lawrence Livermore Lab. California Univ. USA Atlantic Oceanographic and Meteorological Labs. National Oceanic and Atmospheric Administration Miami National Technical Information Service Springfield Miami Univ. Coral Gables School of Law National Oceanic and Atmospheric Administration Rockville National Academy of Sciences Office of Sea Grant Washington D. C. School of Law National Oceanic and Atmospheric Administration Office of Sea Grant. Rockville Norman. Dept. of Civil Engineering and Environmental Science. Urban Mass Transportation Administration Oklahoma Univ. Washington D. C. Knoxville.Dept. of Civil Engineering. Federal Highway Administration Tennessee Univ. Washington D. C. Amherst.Water Resources Research Center. Office of Water Research and Technology Massachusetts Univ. Washington D. C. Calif. Dept. of Industria

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Cogas—A New Look for Naval Propulsion

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Naval Engineers Journal 1974年第5期86卷 41-56页

作者： Abbott, Jack W. Baham, Gary J. Head of the Systems Engineering Section Naval Ship Engineering Center. He received his Bachelor of Science degree in Mechanical Engineering from Stanford University in 1960 and was then commissioned in the U.S. Navy serving as Engineering Officer in the USS Braine (DD-630). Upon completion of his active duty assignments he entered industry as a Development Engineer and became involved with marine application of gas turbine and fluid power systems. In 1966 he assumed full responsibility for the installation design and equipment acceptance tests of the gas turbine generator/waste-heat boiler system for the DDH-280 Class Destroyer including all associated controls ducting and silencing equipment. In 1970 he became Manager of the DD-963 Auxiliary Power “Trade-Off” Study which resulted in significant modification to the electric steam and compressed air systems. A registered Professional Mechanical Engineer in the State of California and the holder of several patents he is presently enrolled in the Masters Program at George Washington University in Engineering Administration. He is a member of ASNE and SNAME and currently holds the rank of Lieutenant Commander in the U.S. Naval Reserve. Head of the Mechanical Systems Department Washington D. C. Office of George G. Sharp Inc. He received his BS degree in Engineering from the University of California at Los Angeles. His career started in the design and development of turbomachinery for commercial and marine applications with the Douglas Aircraft Co. He subsequently was employed by the Southern California Edison Co. and later the Turbo-Power and Marine Department of Pratt & Whitney Aircraft in development of power systems for marine and electrical generation applications. At Litton Ship Systems Inc. he participated in development of propulsion power train machinery for the DD-963 and LHA ship programs. He is a member of SNAME a registered Professional Mechanical Engineer in the State of California and is currently completing requirements for a Masters

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