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13th International Conference on Intelligent Systems Application to Power Systems, ISAP'05

作者： Momoh, James A. Kaili, Xu IEEE Center for Electrical System and Control Department of ECE Howard University Washington DC 20059 Department of Electrical and Computer Engineering Howard University Washington DC 20059 United States Center for Energy Systems and Control Electrial and Computer Engineering Howard University Washington DC 20059 United States

ISBN: (纸本)1599750287

Different from most power systems, the requirement for reliability of the power system on board a spacecraft is much more stringent. However, the reliability of the spacecraft power system can not be solely realized by increasing system redundancies due to limitations on mass. A Ring-Bus topology has been proposed for this purpose. This paper provides an analysis to this special topology, study selected critical possible failure scenarios and propose methods to maximize the serviceability of the system. A spacecraft power system is distinguished from most other system as it orbits around the earth. The primary source of the system is solar energy. Batteries save energy for ellipse time. To maximize the serviceability, the solar energy should be utilized most efficiently and the batteries should be strategically discharged to meet not only immediate load but anticipated load in the future. At the same time, the system should minimize current flows among different ring buses. Multiple objective functions are proposed and implemented in this paper based on different system operating conditions. The main goal is to maximize the serviceability of the system. The optimization result can be utilized to design controllers for the PV sources, loads and batteries. The proposed methods are tested on a Ring-Bus system. The testing result shows that the system can correctly determine its optimum operating strategy and corresponding control actions. © 2005 ISAP.

关键词： Electric power systems

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Robust control Lyapunov functions: the measurement feedback case

Robust control Lyapunov functions: the measurement feedback ...

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IEEE Conference on Decision and control

作者： R.A. Freeman P.V. Kokotovic Center for Control Engineering and Computation Department of Electrical and Computer Engineering University of California Santa Barbara CA USA

We extend the concept of a robust control Lyapunov function (RCLF) for nonlinear systems to the case of measurement feedback. We explore conditions under which the existence of an RCLF is sufficient and/or necessary f... 详细信息

关键词： Robust control computer aided software engineering State feedback Lyapunov method Robustness control systems Uncertain systems control engineering control engineering computing Nonlinear systems

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Counterattack detection in broadcast soccer videos using camera motion estimation

Counterattack detection in broadcast soccer videos using cam...

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2015 International Symposium on Artificial Intelligence and Signal Processing, AISP 2015

作者： Sigari, Mohamad-Hoseyn Soltanian-Zadeh, Hamid Kiani, Vahid Pourreza, Amid-Reza Control and Intelligent Processing Center of Excellence School of Electrical and Computer Engineering College of Engineering University of Tehran Tehran Iran Machine Vision Research Laboratory Computer Engineering Department Faculty of Engineering Ferdowsi University of Mashhad Mashhad Iran

ISBN: (纸本)9781479988174

This paper presents a new method for counterattack detection using estimated camera motion and evaluates some classification methods to detect this event. To this end, video is partitioned to shots and view type of each shot is recognized first. Then, relative pan of the camera during far-view and medium-view shots is estimated. After weighting of pan value of each frame according to the type of shots, the video is partitioned to motion segments. Then, motion segments are refined to achieve better results. Finally, the features extracted from consecutive motion segments are investigated for counterattack detection. We propose two methods for counterattack detection: (1) rule-based (heuristic rules) and (2) SVM-based. Experiments show that the SVM classifier with linear or RBF kernel results in the best results. © 2015 IEEE.

关键词： Motion estimation

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Global asymptotic stabilization of the inverted equilibrium manifold of the 3-D pendulum by hybrid feedback

Global asymptotic stabilization of the inverted equilibrium ...

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IEEE Conference on Decision and control

作者： Christopher G. Mayhew Andrew R. Teel Center of Control Engineering and Computation Electrical and Computer Engineering Department University of California Santa Barbara CA USA

Topological obstructions preclude the existence of a continuous state-feedback control law that globally asymptotically stabilizes the inverted equilibrium manifold of the 3D pendulum. Furthermore, memoryless discontinuous feedbacks are either unbounded or not robust to arbitrarily small measurement noise. In this paper, we propose a hybrid feedback that coordinates a “synergistic” family of potential functions and their gradient-based feedbacks to ensure global asymptotic stability of the inverted equilibrium manifold of the 3D pendulum. The hybrid scheme is robust to small perturbations including measurement noise, eliminates performance limitations of smooth state feedback, and obviates the need for large torques created by some non-smooth state-feedback control laws. We provide a brief simulation study to illustrate the efficacy of the method and compare it with a smooth feedback.

关键词： Three dimensional displays Manifolds Noise Robustness Noise measurement Gravity Switches

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Modeling and simulation of 500 kV transmission network for numerical fault calculation, detection, using PSCAD/EMTDC

Modeling and simulation of 500 kV transmission network for n...

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2011 Asia-Pacific Power and Energy engineering Conference, APPEEC 2011

作者： Kajoijilertsakul, Pairoj Asawasripongtorn, Santi Sanposh, Peerayot Suwatthikul, Jittiwut Fujita, Hideaki Department of Electrical Engineering Faculty of Engineering Kasetsart University Bangkok Thailand Industrial Control and Automation Laboratory National Electronics and Computer Technology Center Bangkok Thailand Department of Electrical and Electronic Engineering Tokyo Institute of Technology Tokyo Japan

ISBN: (纸本)9781424462551

This paper presents modeling of the 500 kV transmission line located between Bang-Saphan 2 (BSP2) and Chom-Bung (CBG) substations, Thailand. The network is modeled based on the transient simulation program- PSCAD/EMTDC. The equivalent circuit of BSP2 and CBG is obtained from the actual parameters. The initial condition parameters are verified by PSS/E, an electrical simulation program. After the modeling has been established, a fault analysis is done by using PSCAD/EMTDC in order to study the system response when fault constrains are applied. This paper has illustrated that how the information on the sampled voltage and current waveforms derived from PSCAD/EMDTC modeling and simulation can be used for fault detection, classification and location. © 2011 IEEE.

关键词： Equivalent circuits

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Wavelet based fault detection, classification and location in existing 500 kV transmission line

Wavelet based fault detection, classification and location i...

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International Conference on electrical engineering/Electronics, computer, Telecommunications and Information Technology

ISBN: (纸本)9781457704246

This paper describes the implementation of Wavelet Transform and Spectral Energy analysis on samples of simulated voltage and current waveforms obtained from PSCAD/EMTDC for each of the all possible fault scenarios in a modeled 500 kV transmission network. The fault detection and classification of each fault scenarios is determined based on results of the voltage and current waveforms analysis in time and wavelet domains. The analysis is carried out including variation in fault types, inception angles and locations with a practically arbitrarily assumed fault duration. The analytical results shows that the described technique is highly dependable and is able to detect and classify different kinds of faults along a transmission line whatever is the fault type, inception angle and location. © 2011 IEEE.

关键词： Wavelet transforms

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Convexity in zero-sum differential games

Convexity in zero-sum differential games

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IEEE Conference on Decision and control

作者： R. Goebel Center for Control Engineering & Computation Department of Electrical & Computer Engineering University of California Santa Barbara CA USA

A new approach to two-player zero-sum differential games with convex-concave cost function is presented. It employs the tools of convex and variational analysis. A necessary and sufficient condition on controls to be an open-loop saddle point of the game is given. Explicit formulas for saddle controls are derived in terms of the subdifferential of the function conjugate to the cost. Existence of saddle controls is concluded under very general assumptions, not requiring the compactness of control sets. A Hamiltonian inclusion, new to the field of differential games, is shown to describe equilibrium trajectories of the game.

关键词： Cost function Open loop systems Sufficient conditions Differential equations control engineering control engineering computing Integral equations

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On the Continuity of Asymptotically Stable Compact Sets for Simulations of Hybrid Systems

On the Continuity of Asymptotically Stable Compact Sets for ...

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IEEE Conference on Decision and control

作者： Ricardo G. Sanfelice Andrew R. Teel Center for Control Engineering and Computation Electrical and Computer Engineering Department University of California Santa Barbara CA USA

ISBN: (纸本)1424401704;9781424401703

We propose a hybrid model for simulations of hybrid systems and we establish conditions on its data so that the asymptotically stable sets observed in simulations are continuous. The most important components of the hybrid model for simulations are a discrete integration scheme for the computation of the flows and an approximated jump mapping for the computation of the jumps. Our main result is built on the facts that, on compact hybrid time domains, every simulation to a hybrid system is arbitrarily close (in the graphical sense) to some solution to the actual hybrid system, and that asymptotically stable compact sets of hybrid systems are semiglobally practically asymptotically stable compact sets for the hybrid model for simulations. We present these results and illustrate them in simulations of the bouncing ball system

关键词： computational modeling Differential equations State-space methods Numerical simulation Analytical models Military computing USA Councils Standards development control systems Packaging

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Intrinsically patterned corrals in monolayer Ag_(5)Se_(2) and selective molecular co-adsorption

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Nano Research 2022年第7期15卷 6730-6735页

作者： Jianchen Lu Shiru Song Shuai Zhang Yang Song Yun Cao Zhenyu Wang Li Huang Hongliang Lu Yu-Yang Zhang Sokrates T.Pantelides Shixuan Du Xiao Lin Hong-Jun Gao Institute of Physics&University of Chinese Academy of Sciences Chinese Academy of SciencesBeijing 100190China Department of Physics and Astronomy and Department of Electrical Engineering and Computer Science Vanderbilt UniversityNashvilleTN 37235USA CAS Center for Excellence in Topological Quantum Computation Chinese Academy of SciencesBeijing 100190China Faculty of Materials Science and Engineering Kunming University of Science and TechnologyKunmingYunnan 650093China

Functionalized two-dimensional(2D)materials play an important role in both fundamental sciences and practical *** construction and precise control of patterns at the atomic-scale are necessary for selective and multiple *** we report the fabrication of monolayer pentasilver diselenide(Ag_(5)Se_(2)),a new type of intrinsically patterned 2D material,by direct selenization of a Ag(111)*** atomic arrangement is determined by a combination of scanning tunneling microscopy(STM),low-energy electron diffraction(LEED),and density-functional-theory(DFT)***-scale STM images exhibit a quasi-periodic pattern of stoichiometric triangular domains with a side length of~15 nm and apical *** boundaries between triangular domains are *** of different molecules on the patterned Ag_(5)Se_(2) exhibits selective adsorption *** molecules preferentially adsorb on the boundaries,while tetracyanoquinodimethane(TCNQ)molecules adsorb both on the boundaries and the triangular *** co-depositing pentacene and TCNQ molecules,we successfully construct molecular corrals with pentacene on the boundaries encircling TCNQ molecules on the triangular *** realization of epitaxial large-scale and high-quality,monolayer Ag_(5)Se_(2) extends the family of intrinsically patterned 2D materials and provides a paradigm for dual functionalization of 2D materials.

关键词： two-dimensional materials dual functionalization scanning tunneling microscope epitaxial growth Ag_(5)Se_(2)monolayer

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A new method for hybrid-fuzzy identification

A new method for hybrid-fuzzy identification

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作者： Núñez, Alfredo Sáez, Doris Škrjanc, Igor De Schutter, Bart Delft Center for Systems and Control Delft University of Technology Delft Netherlands Electrical Engineering Department Universidad de Chile Santiago Chile Faculty of Electrical and Computer Engineering University of Ljubljana Slovenia

ISBN: (纸本)9783902661937

In this paper a new identification method for non-linear hybrid systems that have mixed continuous and discrete states by using fuzzy clustering and principal component analysis is described. The method first determines the hybrid characteristic of the system inspired by an inverse form of the merge method for clusters, which makes it possible to identify the unknown switching points of a process based on just input-output data. Using the switching points, a hard partition of the input-output space is obtained. Then, we propose to use Takagi-Sugeno (TS) fuzzy models with Gaussian MFs as sub-models for each partition. Thus, the overall model is hybrid-fuzzy and will include explicitly the hybrid behavior of the system (the detected switching points) by means of binary MFs, and in each partition all the other non-linearities by means of TS sub-models. An illustrative experiment on a hybrid-tank system is conducted to present the benefits of the proposed approach. © 2011 IFAC.

关键词： Principal component analysis

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