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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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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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A comparison of PSO and backpropagation for training RBF neural networks for identification of a power system with STATCOM

A comparison of PSO and backpropagation for training RBF neu...

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IEEE Swarm Intelligence Symposium, SIS

作者： S. Mohaghegi Y. del Valle 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 Professor Emeritus University of KwaZulu-Natal South Africa

Backpropagation algorithm is the most commonly used algorithm for training artificial neural networks. While being a straightforward procedure, it suffers from extensive computations, relatively slow convergence speed and possible divergence for certain conditions. The efficiency of this method as the training algorithm of a radial basis function neural network (RBFN) is compared with that of particle swarm optimization, for neural network based identification of a small power system with a static compensator. The comparison of the two methods is based on the convergence speed and robustness of each method.

关键词： Neural networks Power systems Automatic voltage control Artificial neural networks Backpropagation algorithms Convergence Radial basis function networks Particle swarm optimization STATCOM Robustness

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Effects of a STATCOM, a SCRC and a UPFC on the dynamic behavior of a 45 bus section of the Brazilian power system

Effects of a STATCOM, a SCRC and a UPFC on the dynamic behav...

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IEEE Power Engineering Society Conference and Exposition in Africa, PowerAfrica

作者： G.K. Venayagamoorthy Y. del Valle S. Mohagheghi W. Qiao S. Ray R.G. Harley D.M. Falcao G.N. Taranto T.M.L. Assis Real-Time Power and Intelligent Systems Laboratory Department of Electrical and Computer Engineering University of Missouri Rolla MO USA School of Electrical and Computer Engineering Georgia Institute of Technology Atlanta GA USA University of KwaZulu-Natal Durban South Africa Engenharia Electrica Universidade Federal de Rio de Janeiro Rio de Janeiro Brazil

Flexible AC transmission systems (FACTS) devices are power electronics based shunt or series devices that are connected to the power network and can improve the system performance and the quality of supply. Application of three types of FACTS devices, a STATCOM, a SCRC and a UPFC, is studied in a 45 bus multimachine power system, as part of the Brazilian power system. The system is exposed to various transient and dynamic disturbances, and the performance of the system reinforced with the FACTS devices is compared with the original system. Simulation results are provided that indicate the effectiveness of these FACTS devices in the overall system behaviour

关键词： Power system dynamics Automatic voltage control Power systems Power system transients Power system simulation Flexible AC transmission systems Power transmission lines PSCAD Power electronics Circuit faults

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Control and simulation of an autonomously flying model helicopter

Control and simulation of an autonomously flying model helic...

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IFAC/EURON Symposium on Intelligent Autonomous Vehicles

作者： Deeg, Carsten Musial, Marek Hommel, Günter Technische Universität Berlin Faculty of Electrical Engineering and Computer Science Real-Time Systems and Robotics Group Germany

MARVIN is a model-helicopter based flying robot, which is able to operate completely autonomously. It has been designed to fulfill the demands of the International Aerial robotics Competition (IARC) Millennial Event 1998-2000. To improve the flight behavior, a mathematical model of the flight characteristics has been developed, which is used for simulation. The flight control algorithm is based on a hierarchy of PID controllers. The results of simulation and real flight experiments show similar behavior in many points but also that not all effects are taken into account, yet. © 2004 IFAC

关键词： Three term control systems

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Communication system for cooperative mobile robots using ad-hoc networks

Communication system for cooperative mobile robots using ad-...

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IFAC/EURON Symposium on Intelligent Autonomous Vehicles

作者： Remuß, Volker Musial, Marek Technische Universität Berlin Faculty of Electrical Engineering and Computer Science Real-Time Systems and Robotics Group Germany

This paper presents a distributed, master-less communication system currently used for communication in a fleet of heterogeneous unmanned aerial vehicles in the European project COMETS for wired and wireless links. Communication is realized using distributed shared memory (DSM) where each network node is holding full or part of the DSM. The coherency of the DSM is kept by a real-time aware protocol that provides quality of service guarantee and dynamic routing. Furthermore, an experiment is presented using the communication system on a wireless ad-hoc network. Copyright © 2004 IFAC

关键词： Memory architecture

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Journal of Information Science and Engineering: Editorial notice

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Journal of Information Science and Engineering 2005年第5期21卷 i-ii页

作者： Lee, Der-Tsai Amato, Nancy M. Chang, Shih-Fu Chen, Homer H. Chen, Tsuhan Hsu, Tsan-Sheng Hwang, Jenq-Neng Kuo, Sy-Yen Kuo, Tei-Wei Li, Chung-Sheng Tokuyama, Takeshi Wing, Jeannette Wu, Tzong-Chen Yen, John Computer Science at Texas A and M University United States Parasol Laboratory United States IEEE Transactions on Parallel and Distributed Systems Computing Research Association's Committee on the Status of Women in Computing Research CRA-W's Distributed Mentor Program United States Department of Electrical Engineering Columbia University United States Lab. United States College of Electrical Engineering and Computer Science National Taiwan University Taiwan IEEE Transactions on Circuits and Systems for Video Technology IEEE Department of Electrical and Computer Engineering Carnegie Mellon University Pittsburgh PA United States ACM ACM SIGACT IEEE Computer Society IICM Austria Research and Development of the Department Multimedia Signal Processing Technical Committee IEEE Signal Processing Society United States IEEE Transactions on Circuits and systems for Video Technology College of Electrical Engineering and Computer Science National Taiwan Ocean University Keelung Taiwan Department of Electrical Engineering National Taiwan University Taiwan Department of Computer Science and Information Engineering National Taiwan University Taipei Taiwan IEEE Technical Committee on Real-Time Systems Computer Science Division IBM T.J. Watson Research Center United States IBM Research Division Graduate School of Information Sciences Tohoku University Japan ACM IPSJ Mathematical Society of Japan Japan Department of Computer Science Computer Science Department Carnegie Mellon University United States National Academies of Science's Computer Science and Telecommunications Board United States Microsoft's Trustworthy Academic Advisory Board Intel Research Pittsburgh's Advisory Board United States Dartmouth's Institute for Security Technology Studies Advisory Committee Canada Sloan Research Fellowships Program Committee United States ACM Taiwan China Information Sciences and Technology Pennsylvania State University United States Laboratory for Intelligent Agents Penn State's School of Info

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A fast method to improve the stability of interest point detection under illumination changes

A fast method to improve the stability of interest point det...

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2004 International Conference on Image Processing, ICIP 2004

作者： Faille, Flore Institute for Real-Time Computer Systems Technische Universität München D-80333 Munich Germany

ISBN: (纸本)0780385543

This paper presents a method to improve the stability of interest point detection under illumination changes. The response of state-of-the-art detectors depends on image contrast, which leads to unstable detection, especially when the position or orientation of the light source changes. Based on a simple image formation model and on ideas of homomorphic filtering, the Harris corner detector - one of the most widely used detectors - is modified to reduce the illumination influence. The computation effort needed for detection is only minimally increased. The algorithm performances are evaluated on real images using repeatability and false positive rates. The detection stability is enhanced, above all under complex lighting changes. ©2004 IEEE.

关键词： Image analysis

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Control and simulation of an autonomously flying model helicopter *

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IFAC Proceedings Volumes 2004年第8期37卷 627-632页

作者： Carsten Deeg Marek Musial Günter Hommel Technische universität berlin faculty of electrical engineering and computer science real-time systems and robotics group

关键词： Helicopter control helicopter dynamics autonomous mobile robots

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Communication system for cooperative mobile robots using ad-hoc networks

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IFAC Proceedings Volumes 2004年第8期37卷 998-1003页

作者： Volker Remuß Marek Musial Technische Universität Berlin Faculty of Electrical Engineering and Computer Science Real-Time Systems and Robotics Group

关键词： communication systems communication networks communication protocols mobile robots autonomous mobile robots network reliability network topologies embedded systems scheduling algorithms

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