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International Conference on Intelligent systems Applications to power systems (ISAP)

作者： M.J. Mousavi K.L. Butler-Purry Power Technology Department ABB Inc. Raleigh NC USA Department of Electrical Engineering Power System Automation Laboratory Texas A and M University College Station TX USA

Automatic data processing and information retrieval is a desirable approach in dealing with the curse of the large volume of data recorded for the condition assessment of equipment in power systems. This approach involves developing a methodology that utilizes the inherent relationships of the data to automate the characterization of system behavior. This paper discusses a practical approach to process incipient abnormality data in an underground distribution system to detect failing equipment. The core components of the proposed approach consist of feature extraction, data mapping, clustering, and rule extraction. Wavelet packet analysis was used to extract the informative features from high frequency current signals and the self-organizing map was utilized to model the data and produce prototype vectors. Descriptive rules for the identified patterns were extracted from the k-means clustering results. The results can be employed in rule-based classifiers to automatically characterize the data in an unsupervised fashion

关键词： Wavelet packets Neural networks Data mining Feature extraction Data processing Information retrieval power systems Wavelet analysis Signal analysis Frequency

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A Discontinuous Carrier-based PWM Modulation Method for the Control of the Neutral Point Voltage of Three-Phase Three-Level Diode Clamped Converters

A Discontinuous Carrier-based PWM Modulation Method for the ...

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Annual IEEE Conference on power Electronics Specialists (PESC)

作者： O. Ojo S. Konduru Department of Electrical and Computer Engineering/Center for Energy System Research Laboratory for Electric Machines and Power Electronics Tennessee Technological University Cookeville TN USA

The neutral-point voltage of the three-level, three-phase converter is regulated using a hysteresis controller which selects the appropriate expression for the zero sequence voltage signal which augments the modulation signal used in the discontinuous carrier-based PWM modulation scheme for voltage control. The analytical expressions for the zero sequence voltages are generalized to three sets making its DSP implementation very easy. Simulation and experimental results verify the usefulness of the proposed neutral-point regulation technique

关键词： Pulse width modulation Pulse width modulation converters Voltage control Diodes Capacitors Space vector pulse width modulation Topology Control systems Phase modulation Stress

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A speed control of an interior permanent magnet motor drive ensuring minimum electrical loss

A speed control of an interior permanent magnet motor drive ...

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IEEE International Conference on Electric Machines and Drives (IEMDC)

作者： O. Ojo Zhiqiao Wu Department of Electrical and Computer Engineering/Center for Energy System Research Laboratory for Electric Machines and Power Electronics Tennessee Technological University Cookeville TN USA

ISBN: (纸本)0780389875

Nonlinear input-output linearization with decoupling concepts are used to effect a high performance speed control of the interior permanent magnet motor drives which also achieves the minimization of the electrical losses - the copper and core losses. This control scheme is unique in that saturation dependent parameters such as the d and q axis inductances and the voltage dependent core loss resistance are all included in the controller structure formulation and implementation. The proposed control scheme differs from known schemes which are either based on perturbation and search methods or on steady state fitted graphs that map the command q and d axis currents based on reference torques. Here, an optimization formulation that dynamically determines the reference currents/voltages required to achieve high performance speed control and total electrical loss minimization is used. The control structure methodology, the nature of the variations of the machine parameters and how they influence the machine efficiency and performance are clearly laid out in experimental and computer simulation results

关键词： Velocity control Permanent magnet motors Performance loss Core loss Voltage control Copper Electric resistance Torque control Search methods Steady-state

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Design Issues of Natural Reference Frame Current Regulators with Application to Four-leg Converters

Design Issues of Natural Reference Frame Current Regulators ...

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Annual IEEE Conference on power Electronics Specialists (PESC)

作者： Gan Dong Olorunfemi Ojo Department of Electrical and Computer Engineering/Center for Energy System Research Laboratory for Electric Machines and Power Electronics Tennessee Technological University Cookeville TN USA

Three-phase, four leg voltage source converters by virtue of the fourth leg connected to the neutral points of the wye-connected loads effectively handle the zero sequence currents and voltages occasioned by load impedance imbalances and/or nonlinearity of loads. This paper outlines a generalized carrier-based pulse-width modulation scheme for this converter which with a natural reference frame control scheme directly controlling the actual load currents ensure current regulation irrespectively of the nature of the load. The controller structure and design are discussed explicitly with attention paid to considerations leading to the selection of the controller parameters yielding satisfactory location of system poles and zeros. The proposed modulation and control schemes are effectively validated by computer simulation and experimental results for the converter operation in the linear and overmodulation regions

关键词： Regulators Leg Voltage Pulse width modulation converters Control systems Impedance Pulse modulation Current control Poles and zeros computer simulation

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Five-phase interior permanent magnet motor for hybrid electric vehicle application

Five-phase interior permanent magnet motor for hybrid electr...

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IEEE Conference on Vehicle power and Propulsion (VPPC)

作者： L. Parsa A. Goodarzi H.A. Toliyat Department of Electrical Computer and System Engineering Rensselaer Polytechnic Institute Troy NY USA US Hybrid Company Torrance CA USA Advanced Electric Machines & Power Electronics Laboratory Department of Electrical Engineering Texas A and M University College Station TX USA

Five-phase interior permanent magnet motors are very good candidates for hybrid electric vehicle applications. High torque pulsation is the major disadvantage of most IPM motor configurations. Choosing proper number of stator slots as well as winding distribution and increasing number of phases are among the possible solutions for reducing torque pulsation. In this paper, five-phase interior permanent magnet motor with fractional-slot stator is studied. It is shown that despite other IPM motors; the proposed five-phase IPM motor with fractional slot has a very low torque pulsation. The mathematical model of five phase interior permanent magnet motor is given. Also it is shown that the MMF of the five-phase motor can remain unchanged by applying proper control algorithm in case of loss of up to two phases. A prototype four pole, IPM motor with 15 stator slots has been built and is used for experimental verification.

关键词： Permanent magnet motors Hybrid electric vehicles Torque Reluctance motors Synchronous motors Rotors Stator windings Forging Application software Propulsion

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Maximization of energy capture of passive, variable-speed wind turbine

Maximization of energy capture of passive, variable-speed wi...

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Second International Conference on power Electronics, Machines and Drives (PEMD 2004).

作者： Fuminao Kinjo Alan K. Wallace Annette von Jouanne Power Systerm & Administration Sec Department of Power System Management Okinawa Electric Power Company Inc. Okinawa Japan Motor Systems Resource Facility (MSRF) School of Electrical Engineering and Computer Science Oregon State University Corvallis OR USA Power Electronics Laboratory School of Electrical Engineering and Computer Science Oregon State University Corvallis OR USA

This paper shows the development of a passive power limiting technique for variable speed generation. An 80kW Wound-Rotor Induction Generator (WRIG) was utilized to demonstrate this characteristic for wind-turbine generators by both modeling and lab demonstration. First, simulations were used to calculate the rotor impedance values that could set maximized speed-power characteristics for steady-state operation. Second, practical tests were performed and compared to the simulation results after the values were set to maximize speed-power characteristics of the 80kW-WRIG. Finally, another tandem connected WRIG was modeled to extend the wind speed range in addition to the 80kW machine.

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Classification of load change transients and incipient abnormalities in underground cable using pattern analysis techniques

Classification of load change transients and incipient abnor...

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IEEE PES Transmission and Distribution Conference and Exposition

作者： M.J. Mousavi K.L. Butler-Purry R. Gutierrez-Osuna M. Najafi Department of Electrical Engineering Power System Automation Laboratory Texas A and M University College Station TX USA Department of Electrical Engineering Power System Automation Laboratory College Station TX Department of Computer Science Texas A&M University College Station TX USA Department of Mechanical Engineering Texas A&M University College Station TX USA

This paper presents a feasibility study on the application of pattern analysis techniques to classify load change transients and incipient abnormalities in an underground distribution cable lateral. The data were collected using an on-line monitoring system installed in a residential area in Dallas. A set of features obtained from wavelet packet analysis was evaluated. Methods of dimensionality reduction were employed to overcome the curse of dimensionality while preserving a good classification rate. The classification results using k-nearest-neighbor (KNN) classifiers show that the proposed methodology can be used to classify load change transients and incipient abnormalities.

关键词： Transient analysis Pattern analysis Tellurium power cables power system transients Wavelet analysis Wavelet packets automation Laboratories electrical fault detection

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Analysis of IR-drop scaling with implications for deep submicron P/G network designs

Analysis of IR-drop scaling with implications for deep submi...

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IEEE International Symposium on Quality Electronic Design

作者： A.H. Ajami K. Banerjee A. Mehrotra M. Pedram Magma Design Automation Cupertino CA USA Department of Electrical Engineering-Systems University of Southern California Los Angeles CA USA Electrical and Computer Engineering Department University of California슠Santa Barbara Santa Barbara CA USA Computer and System Research Laboratory University of Illinois Urbana-Champaign IL USA

This paper presents a detailed analysis of the power-supply voltage (IR) drop scaling in DSM technologies. For the first time, the effects of temperature, electromigration and interconnect technology scaling (including resistivity increase of Cu interconnects due to electron surface scattering and finite barrier thickness) are taken into consideration during this analysis. It is shown that the IR-drop effect in the power/ground (P/G) network increases rapidly with technology scaling, and using well-known counter measures such as wire-sizing and decoupling capacitor insertion with resource allocation schemes that are typically used in the present designs may not be sufficient to limit the voltage fluctuations over the power grid for future technologies. It is also shown that such voltage drops on power lines of switching devices in a clock network can introduce significant amount of skew which in turn degrades the signal integrity.

关键词： Voltage Land surface temperature Electromigration Conductivity Electrons Scattering Counting circuits power measurement Switched capacitor networks Resource management

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Human systems integration and advanced technology in engineering department workload and manpower reduction

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NAVAL ENGINEERS JOURNAL 2003年第1期115卷 57-65页

作者： Lively, KA Seman, AJ Kirkpatrick, M KENNETH A. LIVELY graduated from the University of Colorado with a BS in applied mathematics and an MS in mathematics in 1976 and from the Massachusetts Institute of Technology with an MS in electrical engineering and the degree ocean engineer in naval architecture and marine engineering in 1984. He retired from the U.S. Navy in 1989 after 23 years of service. Assignments included electrical officer on the USS Constellation (CV 64) project engineer for the DDG 51 machinery control system (NAVSEA) and DDG 51 Technical Director (NAVSEA). He was vice president of the PDI Division of Bird-Johnson Company from July 1989 to November 1998 where he managed various gas turbine and machinery controls related development projects. He joined Anteon Corporation's Systems Engineering Group as senior controls engineer in December 1998 where he provided technical support to the integrated power systems program (NAVSEA PMS 510) and managed the Office of Naval Research Afloat Laboratory. DR. MARK KIRKPATRICK is currently an independent consultant in human factors and work-load/manning analysis and modeling. He holds a Ph.D. degree in experimental psychology from The Ohio State University and has 34 years of experience in applied human factors. From 1982 through 2000 Dr. Kirkpatrick served as the senior vice president of Carlow International. Prior to joining Carlow in 1982 Dr. Kirkpatrick served as a member of the technical staff at North American Rockwell's Missiles Division and as a project director and vice president for Essex Corporation. His areas of expertise include workload simulation task analysis operator-in-the-loop simulation human performance experimentation statistical analysis and human factors T&E. He has directed and/or participated in human factors projects for the U.S. Navy U.S. Army NASA Department of Transportation the U.S. Nuclear Regulatory Commission and private industry. ANTHONY J. SEMAN III is the technical manager for the reduced ship's crew by virtual presence (RSVP) advanced technology d

Aboard current ships, such as the DDG 51, engineering control and damage control activities are manpower intensive. It is anticipated that, for future combatants, the workload demand arising from operation of systems under conditions of normal steaming and during casualty response will need to be markedly reduced via automated monitoring, autonomous control, and other technology initiatives. Current DDG 51 class ships can be considered as a manpower baseline and under Condition III typical engineering control involves seven to eight watchstanders at manned stations in the Central Control Station, the engine rooms and other machinery spaces. In contrast to this manning level, initiatives such as DD 21 and the integrated engineering plant (IEP) envision a partnership between the operator and the automation system, with more and more of the operator's functions being shifted to the automation system as manning levels decrease. This paper describes some human systems integration studies of workload demand reduction and, consequently, manning reduction that can be achieved due to application of several advanced technology concepts. Advanced system concept studies in relation to workload demand are described and reviewed including. Piecemeal applications of diverse automation and remote control technology concepts to selected high driver tasks in current DDG 51 activities. Development of the reduced ship's crew by virtual presence system that will provide automated monitoring and display to operators of machinery health, compartment conditions, and personnel health. The IEP envisions the machinery control system as a provider of resources that are used by various consumers around the ship. Resource needs and consumer priorities are at all times dependent upon the ship's current mission and the availability of equipment pawnbrokers.

关键词： Naval warfare

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Experimental investigation of distribution transformer aged solid insulation

Experimental investigation of distribution transformer aged ...

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Midwest Symposium on Circuits and systems (MWSCAS)

作者： M.J. Mousavi K.L. Butler-Purry Department of Electrical Engineering Power System Automation Laboratory Texas A and M University College Station TX USA

In this paper, a laboratory test setup designed to perform transformer insulation experiments at low voltage level is introduced. Monitoring the leakage current flowing through the insulation samples that are taken from an aged distribution transformer is the principle of the investigation. The electrode system utilized and the experimental procedure are described. The test results that highlight important aspects of the insulation behavior concerning incipient fault detection and diagnosis is addressed. The results help identify particular phenomena that might happen when an incipient fault initiates and taking them into account in the characterization of such faults to develop a detection method for the distribution transformer incipient fault.

关键词： power transformer insulation Aging Solids Insulation testing Fault detection Fault diagnosis Laboratories Performance evaluation Low voltage Monitoring

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