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Optimization-based control of multi-vehicle systems

Lecture Notes in Control and Information Sciences 2005年 309卷 63-78页

作者： Fierro, Rafael Wesselowski, Kirk MARHES Laboratory School of Electrical and Computer Engineering Oklahoma State University Stillwater OK 74078 United States Center for Information and Systems Engineering Department of Manufacturing Engineering Boston University Boston MA 02215 United States

ISBN: (纸本)3540228616

There are many applications where a team of mobile robots may be more suitable than a single vehicle, especially where a distributed system of sensors is advantageous. For example, in search-and-rescue operations, deployment of many robots over an area can allow for more thorough and faster coverage. Yet without coordinating the movement of the agents, any advantage of multirobot deployment may be lost and damaging collisions or interference may occur. © Springer-Verlag Berlin Heidelberg 2005.

关键词： Mobile robots

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A new controller structure for current source rectifiers

A new controller structure for current source rectifiers

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

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

High power three-phase current type pulse width modulation (PWM) rectifiers are becoming increasingly popular as the front-end converter in power electronic systems due to unity displacement power factor control, reduced line current harmonics and tighter electromagnetic compatibility (EMC) regulation. A new control structure utilizing the concept of input-output linearization technique, pole and zero placements using the Butterworth polynomial is designed for current source rectifiers for unity power factor operation and dc voltage regulation. Utilization of the complex-variable form model voltage equations expressed in the synchronous reference frame simplifies the presentation and design of the controllers. Experimental and computer simulation results of a controlled rectifier confirm the validity of the proposed control technique.

关键词： Rectifiers Pulse width modulation converters Voltage control Pulse width modulation Reactive power Electromagnetic compatibility EMP radiation effects Power electronics Displacement control Control systems

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Induction motor speed estimation using full-order flux observers ensuring system stability

Induction motor speed estimation using full-order flux obser...

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Annual Conference of Industrial Electronics Society

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

A transparent full-order flux observer design methodology and a model reference adaptive mechanism to estimate the rotor speed of an induction motor are set forth which also ensures system stability in all operability regions. The observer gains are chosen using the Butterworth polynomial and the controller gains of the reference model adaptive speed controller are selected using the concept of the D-decomposition. The overall transfer function between the reference rotor and actual speeds is used to finally determine the controller parameters of the speed loop to enhance the system overall stability in the motoring, regenerative and braking modes of drive operations. The proposed controller and estimator design schemes are validated by computer simulation results for operations in the motoring and regenerating modes

关键词： Induction motors Stability Rotors Design methodology Polynomials Programmable control Adaptive control Transfer functions Control systems computer simulation

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High performance control of a boost AC-DC PWM rectifier-induction generator system

High performance control of a boost AC-DC PWM rectifier-indu...

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

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

This paper presents a control methodology for the dc voltage regulation of an induction generator-ac-dc- boost rectifier system in which the copper loss of the generator is minimized. With the aid of an input-output linearization technique, which linearizes and decouples the model equations in the synchronous reference frame, a rotor flux vector control type high performance is achieved. Steady-state analysis provides some insights into the operability regime of the generator. The effectiveness of the control scheme under different load conditions as well as varying rotor speeds has been demonstrated by computer simulations. Some experimental results are included.

关键词： Pulse width modulation Control systems Induction generators Voltage control DC generators Rotors Rectifiers Copper Linearization techniques Equations

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Control of a dual stator winding induction machine as a source of dc power

Control of a dual stator winding induction machine as a sour...

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

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

This paper investigates the use of a dual stator winding squirrel-cage induction machine for generating dc power using series or parallel connected ac-dc PWM rectifiers. The operating principles and constraints when generating under minimum total copper loss condition are explored using the machine steady-state model considering magnetizing flux saturation effects. Regulation of the dc voltage using concepts of the nonlinear input-output linearization method including the design of the controllers are set forth and confirmed to be effective by computer simulation results. Some experimental waveforms of the generator under load are also included in the paper.

关键词： Stator windings Induction machines Induction generators Pulse width modulation DC generators Power generation Rectifiers Copper Steady-state Magnetic flux

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Power system optimization and coordination of damping controls by series FACTS devices

Power system optimization and coordination of damping contro...

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IEEE Power engineering Society Conference and Exposition in Africa, PowerAfrica

作者： Jung-Wook Park R.G. Harley G.K. Venayagamoorthy LG Electronics Inc. Seoul South Korea School of Electrical and Computer Engineering Georgia Institute of Technology USA Real-Time Power and Intelligent Systems Laboratory Department of Electrical and Computer Engineering University of Missouri Rolla MO USA

Controllable series line compensation by series flexible ac transmission system (FACTS) devices can provide significant transient stability improvement and effective power oscillation damping. The work presented in this paper gives an overview of control issues of series FACTS devices contributing to stable power system operation when applying suitable controllers with appropriately selected system measurements. Firstly, this paper describes two internal control schemes, which are based on the automatic power flow control mode and line impedance compensation mode, for a switching converter type based series FACTS device. Secondly, it shows that the external (secondary) control can give a solution for overall system optimization by providing well-established supplementary controls and adaptive reference changes to the internal controller. Case studies are presented with simulation results by applying the proposed controllers to the series FACTS device on a power system

关键词： Power systems Damping Control systems Automatic control Power system stability Power system transients Flexible AC transmission systems Power system simulation Power system measurements Power system control

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An adaptive Mamdani fuzzy logic based controller for a static compensator in a multimachine power system

An adaptive Mamdani fuzzy logic based controller for a stati...

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

作者： S. Mohagheghi G.K. Venayagamoorthy R.G. Harley School of Electrical and Computer Engineering Georgia Institute of Technology Atlanta GA USA Real-Time Power and Intelligent Systems Laboratory Department of Electrical and Computer Engineering University of Missouri Rolla MO USA University of KwaZulu-Natal South Africa

An adaptive Mamdani based fuzzy logic controller has been designed for controlling a static compensator (STATCOM) in a multimachine power system. Such a controller does not need any prior knowledge of the plant to be controlled and can efficiently control a STATCOM during different disturbances in the network. A model free approach using the controller output error is applied for training purposes that adaptively changes the controller output parameters based on a gradient descent method. Moreover, shrinking span membership functions are used for a more stable and accurate control performance. Simulation results show that the proposed controller outperforms the conventional PI controller during dynamic and transient disturbances

关键词： Programmable control Adaptive control Fuzzy logic Control systems STATCOM Power systems Automatic voltage control Power system modeling Adaptive systems Error correction

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Guest Editorial Wireless Ad Hoc Networks—Part I

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IEEE Journal on Selected Areas in Communications 2005年第1期23卷 1-6页

作者： J.E. Wieselthier E. Altman A. Ephremides J.P. Macker H.B. Russell M. Steenstrup S.B. Wicker A. Segall Information Technology Division Naval Research Laboratory Washington DC USA INRIA Sophia-Antipolis Cedex France Electrical and Computer Engineering Department and the Institute for Systems Research University of Maryland College Park MD USA Department of Electrical and Computer Engineering Clemson University Clemson SC USA Clemson University Stow Research L.L.C. Clemson Flanders SC NJ USA School of Electrical and Computer Engineering Cornell University Ithaca NY USA

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Multiobjective Optimization of Air-Core Linear Permanent Magnet Synchronous Motors for Improved Thrust and Low Magnet Consumption

Multiobjective Optimization of Air-Core Linear Permanent Mag...

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2005国际电机与系统学术会议

作者： S.Vaez-Zadeh A. Hassanpour Isfahani Advanced Motion Systems Research Laboratory Department of Electrical and Computer Engineering University of Tehran North Kargar Avenue P.O. Box 14395/515 Tehran IRAN Advanced Motion Systems Research Laboratory Department of Electrical and Computer Engineering University of Tehran North Kargar Avenue P.O. Box 14395/515 Tehran IRAN

In this paper a multiobjective design optimization of an air-core linear permanent magnet synchronous motor is presented. Thrust, thrust ripple and consumed magnet volume are chosen as objectives for design optimizati... 详细信息

关键词： net Multiobjective Optimization of Air-Core Linear Permanent Magnet Synchronous Motors for Improved Thrust and Low Magnet Consumption

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Run-to-run overlay control of steppers in semiconductor manufacturing systems based on history data analysis and neural network modeling

Run-to-run overlay control of steppers in semiconductor manu...

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作者： Park, Seong-Jin Lee, Moon-Sang Shin, Sung-Young Cho, Kwang-Hyun Lim, Jong-Tae Cho, Bong-Su Jei, Young-Ho Kim, Myung-Kil Park, Chan-Hoon Department of Electrical and Computer Engineering Ajou University Suwon Korea Republic of Semiconductor Business Samsung Electronics Hwasung Korea Republic of School of Electrical Engineering University of Ulsan Ulsan Korea Republic of College of Medicine Korea Bio-MAX Institute Seoul National University Seoul Korea Republic of Department of Electrical Engineering Korea Advanced Institute of Science and Technology Taejon Korea Republic of Memory Division Samsung Electronics Korea Republic of College of Medicine Seoul National University Seoul Korea Republic of Bio-MAX Institute Seoul National University Korea Republic of Systems Biology Laboratory Korea Republic of IEE Korea Republic of KIEE Korea Republic of ICASE United States Division of Electrical Engineering Department of Electrical Engineering and Computer Science Korea Advanced Institute of Science and Technology Taejon Korea Republic of KITE Memory Division Samsung Electronics Korea Republic of Photolithography Technology of Semiconductor FAB

This paper presents a new run-to-run control scheme to reduce overlay misalignment errors in steppers and demonstrates the feasibility of the scheme by real-time experimental tests. The overlay misalignment error mainly depends on two factors: one is the internal dynamics of photo processes and steppers and the other is the process history of lots, such as base equipment and reticles. Based on these observations, a new control scheme was designed to find the stepper inputs minimizing the misalignment errors based on history data analysis and neural network models. Moreover, we demonstrated that the proposed control scheme reduces the spec-out ratios as well as the number of engagements of the send-ahead wafer process, which thereby results in the increase of product yield in semiconductor manufacturing. © 2005 IEEE.

关键词： Semiconductor materials

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