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检索条件"机构=Departments of Computer Engineering & Control Engineering"

共 80 条记录，以下是41-50 订阅

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Sliding mode control of switched uncertain linear systems: Designing robust H∞ sliding surface

Sliding mode control of switched uncertain linear systems: D...

引用

7th International Conference on Electrical and Electronics engineering, ELECO 2011

作者： Lian, Jie Dimirkovsky, Gyorgyi Zhao, Jun Institute of Integrated Process Automation College of Information Science and Engineering Northeastern University Shenyang Liaoning 110004 China Departments of Computer Eng. and Control Eng. Faculty of Engineering Dogus University Acibadem Zeamet Sokak 21 Kadikoy TR-34722 Istanbul Turkey Institute of Automation and Systems Eng. Faculty of Electrical Eng. and Info. Technologies SS Cyril and Methodius University Karpos 2 BB MK-1000 Skopje Macedonia

ISBN: (纸本)9786050102048

The robust H∞ control problem for a class of uncertain switched linear systems by using the variable structure control is investigated. A robust H∞ single sliding surface is shown to exist as long as a convex combination of the subsystems of the switched system is robustly stabilizable with disturbance attenuation level γ. A switching law is constructed via the single Lyapunov function technique. Variable structure controllers of subsystems are designed so as the resulting closed-loop system guarantees the robust H∞ performance. An illustrative example and simulation results are given to demonstrate the effectiveness of the proposed design method. © 2011 Chamber of Turkish Electric.

关键词： Sliding mode control

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Robust H∞ control of switched uncertain time-varying delay discrete-time systems via dynamic output feedback

Robust H∞ control of switched uncertain time-varying delay ...

引用

7th International Conference on Electrical and Electronics engineering, ELECO 2011

作者： Song, Zhengui Dimirkovsky, Gyorgyi Zhao, Jun Institute of Integrated Process Automation College of Information Science and Engineering Northeastern University Shenyang Liaoning 110004 China Departments of Computer Eng. and Control Eng. Faculty of Engineering Dogus University Acibadem Zeamet Sokak 21 Kadikoy TR-34722 Istanbul Turkey Institute of Automation and Systems Eng. Faculty of Electrical Eng. and Info. Technologies SS Cyril and Methodius University Karpos 2 BB MK-1000 Skopje Macedonia

ISBN: (纸本)9786050102048

Robust H∞ output feedback control problem for a class of switched linear discrete-time systems possessing norm-bounded uncertainty and time-varying delay is investigated. A switched dynamic output feedback controller is sought that can robust exponentially stabilize and reduce to a prescribed level the effect of disturbance input on the controlled output in the closed loop. A delay-dependent linear matrix inequality based sufficient condition for the problem to be solvable is derived via the switched Lyapunov functions. controller design is performed by solving a set of linear matrix inequalities. An illustrative example along with simulation results is given to demonstrate the validity of these novel derivations. © 2011 Chamber of Turkish Electric.

关键词： Linear matrix inequalities

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Utility functionals associated with available congestion control algorithms

Utility functionals associated with available congestion con...

引用

IEEE INFOCOM 2010

作者： Lavaei, Javad Doyle, John C. Low, Steven H. Department of Control and Dynamical Systems California Institute of Technology United States Computer Science and Electrical Engineering Departments California Institute of Technology United States

ISBN: (纸本)9781424458363

This paper is concerned with understanding the connection between the existing Internet congestion control algorithms and the optimal control theory. The available resource allocation controllers are mainly devised to derive the state of the system to a desired equilibrium point and, therefore, they are oblivious to the transient behavior of the closed-loop system. To take into account the real-time performance of the system, rather than merely its steady-state performance, the congestion control problem should be solved by maximizing a proper utility functional as opposed to a utility function. For this reason, this work aims to investigate what utility functionals the existing congestion control algorithms maximize. In particular, it is shown that there exist meaningful utility functionals whose maximization leads to the celebrated primal, dual and primal/dual algorithms. An implication of this result is that a real network problem may be solved by regarding it as an optimal control problem on which some practical constraints, such as a real-time link capacity constraint, are imposed. ©2010 IEEE.

关键词： Closed loop systems

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Convexification of optimal power flow problem

Convexification of optimal power flow problem

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48th Annual Allerton Conference on Communication, control, and Computing, Allerton 2010

作者： Lavaei, Javad Low, Steven H. Department of Control and Dynamical Systems California Institute of Technology United States Computer Science and Electrical Engineering Departments California Institute of Technology United States

ISBN: (纸本)9781424482146

The optimal power flow (OPF) problem is nonconvex and generally hard to solve. We provide a sufficient condition under which the OPF problem is equivalent to a convex problem and therefore is efficiently solvable. Specifically, we prove that the dual of OPF is a semidefinite program and our sufficient condition guarantees that the duality gap is zero and a globally optimal solution of OPF is recoverable from a dual optimal solution. This sufficient condition is satisfied by standard IEEE benchmark systems with 14, 30, 57, 118 and 300 buses after small resistance (10-5 per unit) is added to every transformer that originally assumes zero resistance. We justify why the condition might hold widely in practice from algebraic and geometric perspectives. The main underlying reason is that physical quantities such as resistance, capacitance and inductance, are all positive. ©2010 IEEE.

关键词： Electric load flow

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Dynamic stability and control design of modern electric energy systems with large penetration of distributed generators

Dynamic stability and control design of modern electric ener...

引用

2010 IREP Symposium - Bulk Power System Dynamics and control - VIII, IREP2010

作者： Nazari, Masoud Honarvar Ilic, Marija Lopes, J.A. Peças Carnegie Mellon University Pittsburgh PA United States Electrical Engineering Department Porto University Portugal Electrical and Computer Engineering and Engineering and Public Policy Departments Portugal Control of Future Electricity Network Operations Faculty of Technology Policy and Management Delft University of Technology Delft Netherlands Department of Electrical Engineering Faculty of Engineering University of Porto Portugal Portugal

ISBN: (纸本)9781424474677

This paper investigates dynamic stability and control design of modern electric energy systems as many MW-scale distributed generators (DG) of various types are deployed in the distribution side of electric systems. The paper is mainly concerned about small-signal frequency stability of distribution systems with decentralized or centralized control systems. The Gerschgorin Circle Theory and Hicks Stability Theory are used for verifying sufficient conditions for small-signal stability. The paper also discusses about designing advanced enhancing robustness methods to ensure both safety and stability of modern distribution systems. Finally, the paper closes with a discussion of policies needed to support large penetration of DG units in distribution systems to ensure safety and robustness of the system. ©2010 IEEE.

关键词： Distributed power generation

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Stochastic differential dynamic programming

Stochastic differential dynamic programming

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作者： Theodorou, Evangelos Tassa, Yuval Todorov, Emo Departments of Computer Science and Neuroscience Computational Learning and Motor Control Lab. University of Southern California United States Interdisciplinary Center for Neural Computation Hebrew University Jerusalem Israel Department of Computer Science and Engineering University of Washington Seattle WA United States

ISBN: (纸本)9781424474264

Although there has been a significant amount of work in the area of stochastic optimal control theory towards the development of new algorithms, the problem of how to control a stochastic nonlinear system remains an open research topic. Recent iterative linear quadratic optimal control methods iLQG [1], [2] handle control and state multiplicative noise while they are derived based on first order approximation of dynamics. On the other hand, methods such as Differential Dynamic Programming expand the dynamics up to the second order but so far they can handle nonlinear systems with additive noise. In this work we present a generalization of the classic Differential Dynamic Programming algorithm. We assume the existence of state and control multiplicative process noise, and proceed to derive the second-order expansion of the cost-to-go. We find the correction terms that arise from the stochastic assumption. Despite having quartic and cubic terms in the initial expression, we show that these vanish, leaving us with the same quadratic structure as standard DDP. © 2010 AACC.

关键词： Additive noise

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Relationship Between Power Loss and Network Topology in Power Systems

Relationship Between Power Loss and Network Topology in Powe...

引用

2010 49th IEEE Conference on Decision and control

作者： Javad Lavaei Steven H. Low Department of Control and Dynamical Systems California Institute of Technology Computer Science and Electrical Engineering Departments California Institute of Technology

ISBN: (纸本)9781424477456

This paper is concerned with studying how the minimum power loss in a power system is related to its network topology. The existing algorithms in the literature all exploit nonlinear, heuristic, or local search algorithms to find the minimum power loss, which make them blind to the network topology. Given certain constraints on power level, bus voltages, etc., a linear-matrix-inequality (LMI) optimization problem is derived, which provides a lower bound on the minimum active loss in the network. The proposed LMI problem has the property that its objective function depends on the loads and its matrix inequality constraint is related to the topology of the power system. This property makes it possible to address many important power problems, such as the optimal network reconfiguration and the optimal placement/sizing of distributed generation units in power systems. Moreover, a condition is provided under which the solution of the given LMI problem is guaranteed to be exactly equal to the minimum power loss. As justified mathematically and verified on IEEE test systems, this condition is expected to hold widely in practice, implying that a practical power loss minimization problem is likely to be solvable using a convex algorithm.

关键词： power loss power systems Network topology SEARCHING ALGORITHM inequality constraint Network reconfiguration

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Kinematics of quadruped walking on discontinuous terrain without a priori knowledge of the terrain

引用

12th International Conference on Climbing and Walking Robots and the Support Technologies for Mobile Machines, CLAWAR 2009

作者： Iigen, Nihat Ball, Deniz Öztürk, Muhammet Ceylan, Ekin Yalçm, M. Yasin Ulu, Muharrem Çelik, Esra Yeşiloǧlu, S. Murat Air Force Academy Istanbul Turkey Departments of Aeronautical Istanbul Technical University Maslak Istanbul 34469 Turkey Departments of Control Istanbul Technical University Maslak Istanbul 34469 Turkey Department of computer Istanbul Technical University Maslak Istanbul 34469 Turkey Department of Engineering and M echatronics Istanbul Technical University Maslak Istanbul 34469 Turkey

ISBN: (纸本)9814291269

One of the advantages of legged locomotion over wheeled locomotion is that legged locomotion can tolerate much larger discontinuities in the terrain when compared to that of wheeled locomotion. In the absence of visual and/or distance measurement sensory feedback, the walking becomes an extra challenge if a priori knowledge of the terrain which is discontinuous is not available. One can imagine crossing over a stream by walking on rocks in dark. Obviously, the more legs there are, the easier it is to maintain static stability. In this paper, quadruped walking is considered . Briefly, the methodology presented in this paper is a search algorithm of a valid step which has to be in the conditioned manipulability ellipsoid given that the static stability is ensured. This is the necessary condition for a step to be valid. To be sufficient, the directional condition per desired trajectory has to be satisfied. We report our simulation results using 3 degrees-of-freedom per leg robot walking on beams in different height.

关键词： Sensory feedback

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Convexification of optimal power flow problem

Convexification of optimal power flow problem

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Annual Allerton Conference on Communication, control, and Computing

作者： Javad Lavaei Steven H. Low Department of Control and Dynamical Systems California Institute of Technology USA Computer Science and Electrical Engineering Departments California Institute of Technology USA

The optimal power flow (OPF) problem is nonconvex and generally hard to solve. We provide a sufficient condition under which the OPF problem is equivalent to a convex problem and therefore is efficiently solvable. Specifically, we prove that the dual of OPF is a semidefinite program and our sufficient condition guarantees that the duality gap is zero and a globally optimal solution of OPF is recoverable from a dual optimal solution. This sufficient condition is satisfied by standard IEEE benchmark systems with 14, 30, 57, 118 and 300 buses after small resistance (10 -5 per unit) is added to every transformer that originally assumes zero resistance. We justify why the condition might hold widely in practice from algebraic and geometric perspectives. The main underlying reason is that physical quantities such as resistance, capacitance and inductance, are all positive.

关键词： Optimized production technology Symmetric matrices Eigenvalues and eigenfunctions Transmission line matrix methods Resistance Null space

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Investigating epidemic diseases characterized by vertical transmission and contract: Cellular automata computational model

Investigating epidemic diseases characterized by vertical tr...

引用

IFAC International Workshop on "Supplemental Ways for Improving International Stability", SWIIS 2010 - Proceedings

作者： Chang, C.L. Jing, Y. Zhang, S. Stojanovski, G. Stankovski, M. Dimirovski, G. School of Information Science and Engineering Northeastern University 110004 Shenyang China Institute of ASE School FEIT SS Cyril and Methodius University Karpos II BB MK 1000 Skopje Macedonia Computer Eng. and Control Eng. Departments Dogus University TR-34722 Istanbul Turkey

ISBN: (纸本)9783902661920

A computationally and theoretically new model based on cellular automata is developed to generate descriptive emulation of epidemic disease processes, a particularly prevailing phenomenon in developing countries that may cause dramatic events. The feature phenomena of vertical transmission and contract of epidemic diseases are accounted for. Thus the proposed model captures the essence of the epidemic dynamics as demonstrated by the simulation experiments. The proposed model can serve as a background basis for developing more sophisticated models and algorithms to simulate scenario of real-world epidemics based on recorded data. © 2010 IFAC.

关键词： Cellular automata

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