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Power Conversion Conference (PCC-Nagaoka)

作者： Zeng, YN Feng, DS Chen, BS Research Institute of Electrical Machinery and Control Engineering Shanghai University Shanghai China Research Institute of Automation Guangdong University of Technology Guangzhou China

ISBN: (纸本)0780338235

A new simplified equivalent model of induction motor is proposed firstly in this paper, which Is derived based on the voltage decoupling control principle of induction motor. The model consists of two subsystems, one is rotor flux subsystem and another Is torque current subsystem, that is identical with that of DC-motor. According to this model, a speed calculation method is presented for a speed sensorless vector-controlled induction motor drive system, which is using integration of the difference between the command of torque current and the torque component of stator current. Tile validity of the proposed method is verified by computer simulation results.

关键词： Induction motors Voltage control Stators Sensorless control Induction motor drives Rotors Automatic voltage control Torque control Machinery automation

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Synthesized passive feedback control of sensor-rich structures

Synthesized passive feedback control of sensor-rich structur...

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American control Conference (ACC)

作者： P. Akella J.T. Wen Control Laboratory for Mechanical Structures (CLaMS) Center for Advanced Technology in Automation Robotics & Manufacturing Department of Electrical Computer and Systems Engineering Rensselaer Polytechnic Institute Troy NY USA

The passivity property of dissipative mechanical structures has long been exploited in designing passive controllers that provide robust stability even in the presence of unmodeled dynamics of the system. For an input/output map of a flexible structure to be passive, collocation of the actuators and sensors is required and also the sensors should measure the velocity of the system. The so-called smart structures frequently have more sensors than actuators. Therefore, the passive controller can at best utilize only a subset of the sensors. In this paper we consider the design of a squaring down matrix which would render a system passive subject to some additional performance considerations. The problem of obtaining the synthesized passive output is cast as a set of linear matrix inequalities (LMIs) which can be efficiently solved by the LMI Toolbox in Matlab. We apply this procedure with the assumption that the sensors provide both displacement and velocity information which is generally not true. We show that the passive controllers can be implemented without the use of velocity information. By using synthesized passive outputs in addition to naturally occurring passive outputs, we obtain better system performance. We present experimental results involving a single flexible beam with torque input and hub angular position and strain gage outputs.

关键词： Feedback control Intelligent sensors control system synthesis Mechanical sensors Sensor systems Linear matrix inequalities Mechanical factors control systems Robust stability Flexible structures

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A neural network controls the galvannealing process

A neural network controls the galvannealing process

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Conference Record of the IEEE Industry Applications Society Annual Meeting (IAS)

作者： C. Schiefer F.X. Rubenzucker H.P. Jorgl H. Aberl Laboratory for Intelligent Control Methods for Process Technologies Institute for Machine and Process Automation Vienna University슠of슠Technology Vienna Austria Electrical Engineering and Process Control Research and DevelopmentDepartment TAW Voest-Alpine Industrieanlagenbau GmbH Linz Austria

High quality galvanized steel strip is a need of today's manufacturers of various products. In particular, in the top quality section steel strips for the automotive, building and consumer goods industries only those steel producers will be successful who are applying state-of-the-art process technologies. For this reason, VOEST-ALPINE Industrieanlagenbau mbH (VAI) and VOEST-ALPINE Stahl Linz developed a new galvannealing control system to optimize this metallurgical process. As the latest improvement of the galvannealing control strategy, a neural network controller has been developed by VAI in Cooperation with the Vienna University of technology Christian Doppler Laboratory for Intelligent control Methods for Process Technologies. The paper describes the galvannealing process as far as it is necessary for the understanding of the controller functions, the controller structure and its essential functions. Furthermore, the neural network structure used and its integration into the controller system are explained. A discussion of simulation and practical operating results shows the improvements achieved by using a neural network controller in comparison to the conventional controller.

关键词： Neural networks Process control Steel Strips electrical equipment industry Manufacturing industries Metals industry control systems Galvanizing Automotive engineering

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CONDITIONS ON SOURCE SIGNALS FOR BLIND SEPARATION

CONDITIONS ON SOURCE SIGNALS FOR BLIND SEPARATION

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1996 3rd International Conference on Signal Processing(ICSP’96)

作者： Jie Zhu Xi-Ren Cao Institute of Radio & Automation Control The South China University of Technology Department of Electrical & Electronic Engineering The Hong Kong University of Science and Technology

ISBN: (纸本)0780329120

In blind source separation problem it is usually assumed that the source signals are mutually *** has been realized that this assumption is not *** this paper,we provide some general conditions under which the source signals can be recovered from their linear mixtures. We first define two concepts,the mutually M-th order independence and the pairwise M-th order independence,on a set of random *** we prove that if the source signals are mutually M-th order independent,then those source signals,each of which has at least one nonzero m-th order cumulant for 3≤m≤M,can be *** conclusion is in spirit similar to but more general than that proposed by Tong et al[10].The constructive proof suggests an algorithm for the blind separation of sources which are mutually Af-th order *** examples arc presented to illustrate the results.

关键词： CONDITIONS ON SOURCE SIGNALS FOR BLIND SEPARATION

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An Object-Oriented Transformer Model in OMOLA

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IFAC Proceedings Volumes 1996年第1期29卷 7099-7104页

作者： Magnus Akke Jerker Linder Bernt Nilsson Olof Samuelsson Sydkraft AB S-205 09 Malmö Sweden ABB Industrial Systems AB S-721 67 Västerås Sweden Department of Automatic Control Lund Institute of Technology P.O. Box 118 S-221 00 Lund Sweden Department of Industrial Electrical Engineering and Automation Lund Institute of Technology P.O. Box 118 S-221 00 Lund Sweden

Energizing of a transformer can cause large inrush currents. The current magnitude can be up to 30 times larger than the rated transformer current. Dynamic models of transformers are therefore an indispensable tool for transient analysis of inrush currents. This transient phenomena is difficult to simulate and display. The paper presents an object-oriented approach to transformer modeling using the modeling language OMOLA. The model is decomposed into submodels capturing different physical phenomena of the transformer. The proposed model shows good agreement between simulation and measurement of the inrush current.

关键词： Dynamic modeling object modelling technique power system transformers transient analysis

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Preisach modeling of piezoceramic and shape memory alloy hysteresis

Preisach modeling of piezoceramic and shape memory alloy hys...

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IEEE Conference on control technology and Applications (CCTA)

作者： D. Hughes J.T. Wen Control Laboratory for Mechanical Structures (CLaMS) Center for Advanced Technology in Automation Robotics & Manufacturing Department of Electrical Computer and Systems Engineering Rensselaer Polytechnic Institute Troy NY USA

Smart materials such as piezoceramics and shape memory alloys (SMAs) exhibit significant hysteresis and in order to estimate the effect on open and closed loop control a suitable model is needed. One promising candidate is the Preisach independent domain hysteresis model that is characterized by the congruent minor loop and wiping out properties. Comparable minor loop and decaying oscillation test data for a multi-sheet piezoceramic actuator (made of lead zirconate titanate) attached to a flexible beam are presented and are seen to be very consistent with the two Preisach model properties. The commanded parameter is the sheet transverse electric field while the measured parameter is an approximately colocated strain induced in the beam. Equivalent data for a Nitinol SMA wire muscle, attached to the same beam, are also presented. The input and output parameters are the SMA current and a beam strain respectfully. The minor loop and wiping out evidence is less strong than that of the piezoceramic case, but encouraging. In all experiments the quasi-steady state responses were generated in order to avoid exciting beam flexible modes which would complicate the analysis.

关键词： Piezoelectric materials Shape memory alloys Hysteresis Strain measurement Shape control Open loop systems Testing Actuators Titanium compounds Electric variables measurement

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Synthesized passive feedback control of sensor-rich smart structures-experimental results

Synthesized passive feedback control of sensor-rich smart st...

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IEEE Conference on control technology and Applications (CCTA)

作者： P. Akella J.T. Wen Control Laboratory for Mechanical Structures Department of Electrical Computer and Systems EngineeringCenter for Advanced Technology in Automation Robotics & Manufacturing Rensselaer Polytechnic Institute RPI Troy NY USA

Passivity based controllers are used in structural control due to their inherent robustness properties. These controllers require sensor/actuator collocation. In this paper, we consider the design of a "squaring down" matrix which renders a system passive by using a linear combination of all collocated and non-collocated sensor/actuator pairs. The design uses experimental transfer functions and does not require the knowledge of the system model. The problem of finding the squaring down matrix is cast as a solution to a set of linear matrix inequalities (LMIs) subject to some additional performance considerations. The design procedure of the squaring down matrix assumes that velocity information is available from the sensors which is not generally the case. We show that the squaring down matrix can be implemented without the use of such velocity information. We provide experimental results gathered from the single link flexible beam setup in the C/sub La/MS laboratory at RPI to show that implementation of passive loops without velocity measurements provides very good results.

关键词： Feedback control Linear matrix inequalities Intelligent sensors control system synthesis Robust control Sensor systems Hydraulic actuators Transfer functions Laboratories Economic indicators

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A practical resource scheduling with OPF constraints

A practical resource scheduling with OPF constraints

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Power Industry Computer Application Conference (PICA)

作者： K.H. Abdul-Rahman S.M. Shahidehpour M. Aganagic S. Mokhtari Siemens Empros Power Systems Control USA Department of Electrical and Computer Engineering Illinois Institute of Technology Chicago IL USA Empros Power Systems Control Siemens Energy and Automation Inc. Brooklyn MN USA

This paper presents an efficient approach to short term power system resource scheduling based on the augmented Lagrangian relaxation method. The problem is divided into two stages, the commitment stage and the constrained economic dispatch stage. The proposed mathematical model incorporates optimal power flow (OPF) constraints in the unit commitment stage. By OPF constrains, the authors refer to the relevant active power constraints that are incorporated in the constrained economic dispatch stage (i.e. transmission capacity constraints, fuel and various regulated emission requirements). The inclusion of OPF constraints in the commitment stage will improve the feasibility of the constrained economic dispatch solution. Other unit commitment constraints such as spinning and operating reserve requirements, power balance as well as other relevant local constraints (i.e. unit ramping rates, upper and lower generation limits, minimum up and down times) are taken into account in the proposed model. As a larger number of constraints are dealt with, a more rigorous method is introduced for updating Lagrange multipliers to improve the solution convergence. A software package which addresses energy management systems requirements is developed and tested.

关键词： Power generation economics Fuel economy Power system modeling Lagrangian functions Relaxation methods Power system economics Mathematical model Load flow Spinning Power generation

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A Simulation, Environment for Eyaluation of Kowledge Based Fault Diagnosis Systems

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IFAC Proceedings Volumes 1994年第10期27卷 59-64页

作者： Alenka Žnidaršič Victor J. Terpstra Henk B. Verbruggen Jožef Stefan Institute Department of Computer Automation and Control Jamova 39 61111 Ljubljana Slovenia Delft University of Technology Department of Electrical Engineering. Control Laboratory P.O. Box 5031. 2600 GA Delft The Netherlands

In the paper a simulation environment for evaluation of knowledge based fault diagnostic systems is presented. The contribution deals with the concept of the environment that provides an integration of qualitative and quantitative models. This concept is presented on a simulated water-column process controlled by feedback. The simulation environment is used to evaluate the potentials of Multilevel Flow Modelling (MFM) approach to system diagnosis. The environment is realized within the real-time expert system tool G2.

关键词： Fault diagnosis multilevel flow models simulation model-based reasoning

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SHIPS SERVICE ELECTRIC-POWER - ENHANCED SURVIVABILITY VIA EARLY DETECTION OF INCIPIENT CABLE FAULTS

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NAVAL ENGINEERS JOURNAL 1993年第3期105卷 78-84页

作者： WILLIAMS, SE RUSSELL, BD Stephen E. Williams:graduated summa cum laude from Texas A&M University with a B.S. degree in electrical engineering in 1991. He is still at Texas A&M while completing an M.S. in E.E. with special interest in low voltage (less than 600 V) network protection. Mr. Williams is a National Science Foundation Graduate Research Fellow and a student member of the IEEE. B. Don Russell:received B.S. and M.E. degrees in electrical engineering at Texas A&M University. He holds a Ph.D. from the University of Oklahoma in power system engineering. Dr. Russell is a professor of electrical engineering and director of the Power System Automation Laboratory of the Electric Power Institute Texas A&M University. His research centers on the use of advanced technologies to solve problems in power system control protection and monitoring. He is the recipient of several awards and patents for advanced digital technology applications. Dr. Russell is a member of the IEEE Power Engineering Society Executive Board. He also chairs the annual TAMU Conference for Protective Relay Engineers and the Fault and Disturbance Analysis Conference. Dr. Russell is a fellow of the IEEE a Registered Professional Engineer and a member of the Texas Society of Professional Engineers.

Researchers at Texas A&M Universitv have studied the effects of battle damage on ship power distribution cables, with particular interest in damaged cables which did not fail immediately. The electrical signatures of partiallv damaged cables are significant and are detectable with advanced protection methods used on terrestrial power svstems. Findings show that the damaged cable signatures are similar to those of arcing faults on terrestrial power distribution svstems, which can be reliably detected using an on-line expert svstem [1,2,3]. The implications of these findings are significant. Since the abilitv of a damaged ship to right through an encounter is entirelv dependent on keeping operational its various systems which rely on electric power, the ability to automatically detect and re-route power around damaged regions is imperative. By identifving the characteristics of failing power cables before catastrophic failure occurs, the protection process can be integrated into the ship automatic control system. The overall result is a more survivable ship.

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