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IEEE Conference on control Technology and Applications

作者： Fukiko Kawai Takashi Hayashi Takayuki Kaneko Palle Andersen Jan Dimon Bendtsen Section of Automation and Control Aalborg University Aalborg Denmark Fuji Electric Co. Ltd. Japan

Disturbance Feedback control (DFC) is a control concept in which an existing controller is augmented with an additional feedback in order to achieve better disturbance rejection performance. This paper proposes an anti-sway control scheme for crane systems using robust DFC designed to minimize the sway angle and trolley position errors via Linear Matrix Inequality optimization. The robust DFC is added to an existing crane control system composed of a feed forward and state feedback control. Simulation results for the gantry crane system show improvements in control performance when the gantry load is subjected to impulse force disturbances.

关键词： DFC LMI gantry load

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Time Optimal Robust Fleet Management of Micro UAV Through Timed Games Formulation

Time Optimal Robust Fleet Management of Micro UAV Through Ti...

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control Technology and Applications (CCTA),

作者： Henrik Schiøler Luminita Totu Jan Dimon Kim Guldstrand Larsen Jakob Haahr Taankvist Section for Control and Automation Aalborg Universty Aalborg Denmark Department for Computer Science Aalborg Universty Aalborg Denmark Aalborg Universitet Aalborg DK

We consider the case of fleet management of a moderate number of Unmanned Aerial Vehicles (UAV or UAS) in confined space, e.g. indoor. Indoor operation of UAVs requires indoor localization capabilities as well as a sufficiently precise 3D map of the facility, whereas fleet management of multiple UAV adds an extra dimension of complexity. Additional complexity is mainly introduced by constraints ensuring collision free operation. Based on earlier work on mapping, path planning and localization we suggest fleet management through a Timed Game formulation and Winning Strategy controller synthesis using the tool Uppaal Tiga.

关键词： Automata Games Unmanned aerial vehicles Uncertainty Path planning Schedules Clocks

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Lyapunov Function Synthesis - Infeasibility and Farkas’ Lemma

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IFAC-PapersOnLine 2017年第1期50卷 1667-1672页

作者： Leth T. Sloth C. Wisniewski R. Sankaranarayanan S. Department of Electrical Engineering Section of Automation & Control University of Aalborg Aalborg East 9220 Denmark Department of Computer Science University of Colorado Boulder CO United States

In this paper we prove the convergence of an algorithm synthesising continuous piecewise-polynomial Lyapunov functions for polynomial vector fields defined on simplices. We subsequently modify the algorithm to sub-divide locally by utilizing information from infeasible linear problems. We prove that this modification does not destroy the convergence of the algorithm. Both methods are accompanied by examples. © 2017

关键词： Algorithmic design Lyapunov methods Stability of nonlinear systems

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Thermoelectric properties of nanostructured material based on Si and GaSb 4th

Thermoelectric properties of nanostructured material based o...

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4th Asian School-Conference on Physics and Technology of Nanostructured Materials, ASCO-Nanomat 2018

作者： Goroshko, Dmitrii L. Subbotin, Evgeniy Y. Chusovitin, Evgeniy A. Balagan, Semeyon A. Galkin, Konstantin N. Dotsenko, Sergey A. Gutakovskii, Anton K. Khovaylo, Vladimir V. Usenko, Andrey A. Nazarov, Vladimir U. Galkin, Nikolay G. Institute of Automation and Control Processes FEB RAS 5 Radio St. Vladivostok690041 Russia Institute of Semiconductor Physics of SB RAS 13 pr. Lavrentieva Novosibirsk630090 Russia National University of Science and Technology "MISiS" 4 Leninskiy pr. Moscow119049 Russia Academia Sinica Research Center for Applied Sciences 128 Section 2 Academia Road Nangang Taipei11529 Taiwan

ISBN: (纸本)9783035714777

Successively forming GaSb islands by solid-phase epitaxy and covering them with a silicon layer, a nanostructured material containing 4 layers of GaSb nanocrystals (NCs) was grown on Si(111) surface. Due to a small size of the NCs (average height ~ 1.7 nm, average lateral size ~ 14 nm) and, as a consequence, to a significant quantum-size effect, a high electrical conductivity (~ 100 Ω-1·cm-1 at 600 K) together with a low thermal conductivity (~ 1 - 1.5 W·m-1·K-1 at 600 K) was obtained in the nanostructured material Si/NC_GaSb/Si. As a result, the thermoelectric figure of merit of the material has reached 0.82 at 600 K. © 2018 Trans Tech Publications, Switzerland

关键词： Silicon

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DiSC-OPAL: A simulation framework for real-time assessment of distribution grids

DiSC-OPAL: A simulation framework for real-time assessment o...

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2017 Workshop on Modeling and Simulation of Cyber-Physical Energy Systems, MSCPES 2017

作者： Kemal, Mohammed S. Pedersen, Rasmus Iov, Florin Olsen, Rasmus Wireless Communications Department of Electronic Systems Aalborg University Aalborg Denmark Automation and Control Section Department of Electronic Systems Aalborg University Aalborg Denmark Department of Energy Technology Aalborg University Aalborg Denmark Section for Wireless Communications Department of Electronic Systems Aalborg University Aalborg Denmark

ISBN: (纸本)9781509064397

Smart grid functionalities require developing, testing and verification of complex systems in a realistic environment that captures the three main domains: control, ICT, and Electrical Grid. Real-time simulations that can support hardware in the loop methods have a pivotal role for modeling of such systems. The simulation tool should be able to model Electrical Grid and flexible assets with different time scales and resolution levels fulfilling specific functionalities. In this paper DiSC-OPAL, an OPAL-RT compatible toolbox library for modelling of assets is presented. The library is suitable for demand response and power/energy management applications. To demonstrate its functionality and usage, active power management scenario in real-time environment coupled with communication network emulation is outlined. © 2017 IEEE.

关键词： Electric power transmission networks

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Safety Analysis of Stochastic Dynamical Systems

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IFAC-PapersOnLine 2015年第27期48卷 62-67页

作者： Sloth, Christoffer Wisniewski, Rafael Section for Automation and Control Aalborg University Denmark

This paper presents a method for verifying the safety of a stochastic system. In particular, we show how to compute the largest set of initial conditions such that a given stochastic system is safe with probability p. To compute the set of initial conditions we rely on the moment method that via Haviland's theorem allows an infinite dimensional optimization problem on measures to be formulated as a polynomial optimization problem. Subsequently, the moment sequence is truncated (relaxed) to obtain a finite dimensional polynomial optimization problem. Finally, we provide an illustrative example that shows how the p-safe initial set is computed numerically. © 2015, IFAC (International Federation of Automatic control) Hosting by Elsevier Ltd. All rights reserved.

关键词： Stochastic systems Convex optimization Dynamical systems Formal verification Method of moments Convex optimisation Finite dimensional Infinite dimensional Initial conditions Optimization problems Polynomial optimization problem Safety analysis Stochastic dynamical system

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On the computation of Lyapunov functions for interconnected systems

On the computation of Lyapunov functions for interconnected ...

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IEEE International Symposium on Computer Aided control System Design (CACSD)

作者： Christoffer Sloth Section for Automation & Control Aalborg University Aalborg East Denmark

This paper addresses the computation of additively separable Lyapunov functions for interconnected systems. The presented results can be applied to reduce the complexity of the computations associated with stability analysis of large scale systems. We provide a necessary and sufficient condition for the existence of an additively separable Lyapunov function; subsequently, sparsity conditions are given for finding additively separable polynomial Lyapunov functions for both local and global stability of polynomial systems.

关键词： Lyapunov methods Interconnected systems Stability analysis Optimization Asymptotic stability Nonlinear systems Topology

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Evaluation of Wind Farm controller based Fault Detection and Isolation

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IFAC-PapersOnLine 2015年第21期48卷 1084-1089页

作者： Odgaaard, Peter Fogh Shafiei, Seyed Eshan Section of Automation and Control Aalborg University Denmark

In the process of lowering cost of energy of power generated by wind turbines, some focus has been drawn towards fault detection and isolation and as well as fault tolerant control of wind turbines with the purpose of increasing reliability and availability of the wind turbines. Most modern wind turbine projects are organized in wind farms, in which controllers are available at wind farm level as well in the individual wind turbines. Different information are available at these levels, and the infromation is as well sampled with different sample frequencies. A benchmark model for wind farm fault detection and isolation and fault tolerant control has previously been proposed. Based on this model, and international competition on wind farm FDI was organized. The contributions were presented at the IFAC World Congress 2014. In this paper the top three contributions to this competition are shortly introduced and evaluated. © 2015

关键词： Wind turbines

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Lyapunov function synthesis — Algorithm and software

Lyapunov function synthesis — Algorithm and software

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IEEE International Symposium on Computer Aided control System Design (CACSD)

作者： Tobias Leth Christoffer Sloth Rafał Wisniewski Department of Electrical Engineering section of Automation & Control University of Aalborg Aalborg East Denmark

In this paper we introduce an algorithm for the synthesis of polynomial Lyapunov functions for polynomial vector fields. The Lyapunov function is a continuous piecewise-polynomial defined on simplices, which compose a collection of simplices. The algorithm is elaborated and crucial features are explained in detail. The strengths and weaknesses of the algorithm are exemplified and a new way of sub-dividing the simplices is presented.

关键词： Lyapunov methods Face Algorithm design and analysis Software algorithms Two dimensional displays Asymptotic stability Power system stability

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control-oriented first principles-based model of a diesel generator

Control-oriented first principles-based model of a diesel ge...

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European control Conference (ECC)

作者： Jesper Knudsen Jan Bendtsen Palle Andersen Kjeld Madsen Claes Sterregaard Section for Automation and Control Aalborg University Aalborg Denmark DEIF A/S Skive Denmark

This paper presents the development of a control-oriented tenth-order nonlinear model of a diesel driven generator set, using first principles modeling. The model provides physical system insight, while keeping the complexity at a level where it can be a tool for future design of improved automatic generation control (AGC), by including important nonlinearities of the machine. The nonlinearities are, as would be expected for a generator, primarily of bilinear nature. Validation of the model is done with measurements on a 60 kVA/48 kW diesel driven generator set in island operation during steps of active electrical load.

关键词： Stator windings Rotors Generators Automatic generation control Fuels Torque

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