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A control theoretical approach to congestion control of TCP/AQM networks 10

A control theoretical approach to congestion control of TCP/...

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2009 10th European control Conference, ECC 2009

作者： Alvarez, Teresa Salim, Anuar Maestre, J.M. Department of Engineering Science and Automatic Control School of Computer Engineering University of Valladolid Spain Department of Engineering Science and Automatic Control Faculty of Science University of Valladolid Spain Dept. de Ingeniería de Sistemas y Automática Escuela Superior de Ingenieros University of Seville Spain

ISBN: (纸本)9783952417393

This paper shows how control techniques, such as PID or generalized predictive control, can improve the performance of TCP/IP networks when dealing with congestion. Drop tail, or more sophisticated AQM techniques such as RED, perform worse than process control techniques. A comparison between the different methods in different working scenarios is analyzed. Two different GPC controllers are evaluated. One considers the model resulting from on-line identification and the other is the linearization of the non-linear model. © 2009 EUCA.

关键词： Transmission control protocol

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A compact power converter for hybrid energy systems

A compact power converter for hybrid energy systems

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作者： Cai, Jun Zhong, Qing-Chang Stone, David Dept. Automatic Control and Systems Engineering University of Sheffield SheffieldSI 3JD United Kingdom Dept. Electronics and Electrical Engineering University of Sheffield SheffieldSI 3JD United Kingdom

ISBN: (纸本)9781479940325

In hybrid energy systems, batteries and supercapacitors are usually taken as storage mechanisms for smoothing output power, start-up transition, and various load conditions. As a result, developing hybrid power conversion systems has become an attractive research topic. In this study, a compact non-isolated bidirectional DC-DC converter is proposed to interface two DC power sources, which mainly benefit with reduced power switches. In detail, only two switches are needed while for conventional systems four switches are required. Although the number of switches is reduced by half, the proposed converter is still proficient for energy diversification from two energy sources individually or simultaneously. Another benefit of the proposed converter is its extensibility. Several converters are given by easily extending the proposed converter to different applications. They also feature with reduced power switches compare to conventional systems. Detailed analysis on the topology and control algorithm of the proposed converter are given. Real-time simulation results are provided to verify the validity of the proposed system. © 2014 IEEE.

关键词： Topology

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Multi-objective control strategy for energy management of grid-connected heterogeneous microgrids

Multi-objective control strategy for energy management of gr...

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American control Conference

作者： Christos D. Korkas Simone Baldi Iakovos Michailidis Elias B. Kosmatopoulos Dept. of Electrical and Computer Engineering Democritus University of Thrace Xanthi 67100 Greece Delft Center for Systems and Control Delft University of Technology Delft 2628CD The Netherlands Informatics & Telematics Institute Center for Research and Technology Hellas (ITI-CERTH) Thessaloniki 57001 Greece

ISBN: (纸本)9781479917730

The demand-side energy management of microgrids comprising of buildings of heterogeneous nature (residential, commercial, industrial, etc.) and thus exhibiting heterogeneous occupancy pattern, requires the development of appropriate energy management systems (EMSs) that can integrate the maximum exploitation of the distributed energy resources like photovoltaic panels with the thermal comfort of the occupants. This paper presents a simulation-based optimization approach for the design of an EMS in grid-connected photovoltaic-equipped microgrids with heterogeneous buildings and occupancy schedules. The EMS optimizes a multi-objective criterion that takes into account both the energy cost and the thermal comfort of the aggregate microgrid. A three-building microgrid test case is used to demonstrate the effectiveness of the proposed approach: comparisons with alternative rule-based and optimization-based EMSs show that the proposed EMS strategy exploits the occupancy information to automatically change the energy demand of each building, resulting in improved energy cost and thermal comfort.

关键词： Energy management THERMAL COMFORT Energy costs MICRO-GRID Vehicle Occupancy multi-objective control Buildings control strategy distributed energy resources Optimal design

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A model-based approach for achieving available automation systems 19

A model-based approach for achieving available automation sy...

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19th IFAC World Congress on International Federation of automatic control, IFAC 2014

作者： Priego, R. Armentia, A. Orive, D. Estévez, E. Marcos, M. University of the Basque Country Department of System Engineering and Automatics Bilbao48013 Spain Universidad de Jaén Dept. of Electronics and Automatic Control Jaen Spain

ISBN: (纸本)9783902823625

Nowadays automation systems are required to be flexible in order to cope with the ever changing requirements of the applications in terms of complexity, extensibility or dynamism. The use of reconfiguration techniques helps to meet these demanding requirements, but at the same time increase the complexity of the systems. This paper presents a supervisor architecture that allows maintaining the availability of a control system in spite of failures such as a node crash, by means of reconfigurations at the control level. To do this, the advantages that Model-Driven Development technology provides have been explored. © IFAC.

关键词： Automation

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Optimal control with fixed-end point for linear perturbed systems

Optimal control with fixed-end point for linear perturbed sy...

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International Conference on System Theory, control, and Computing (ICSTCC)

作者： Florin Ostafi Corneliu Botan Dept. of Automatic Control and Applied Informatics Technical University of Iasi Iasi Romania

The linear quadratic optimal control problem for time invariant systems is presented. The problem with Unite final time and fixed end-point is considered. The study takes into account the influence of the time variant perturbations in optimal control law implementation. The applicability of the proposed algorithm is illustrated by simulation tests.

关键词： Vectors Optimal control Equations Optimization Estimation Switches Real-time systems

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Synchronverter-based Transformerless PV Inverters

Synchronverter-based Transformerless PV Inverters

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Annual Conference of the IEEE Industrial Electronics Society

作者： Wen-Long Ming Qing-Chang Zhong Dept. Automatic Control and Systems Engineering The University of Sheffield

ISBN: (纸本)9781479940318

In this paper, a transformerless PV inverter is proposed, which is formed by adding a neutral leg into conventional half bridge inverter. It consists of one neutral leg and one inverter leg. The presence of the neutral leg enables the direct connection between the ground of PV panels and the ground. Two main benefits are then obtained. First, the common mode currents are completely eliminated because the stray capacitors between the PV panels and the grid neutral line are bypassed. Another benefit is the voltage of the PV is only required to be higher than the peak value of the grid voltage, which is same as that of conventional full bridge inverter. In addition, the synchronverter technology designed for three-phase inverters is extended to a single-phase case to design the controller of the inverter leg. As a result, the proposed inverter becomes more grid-friendly. The control of the two legs are independent with each other, which means the controller design much easier. The performance of the whole system is evaluated in detail with the provided real-time simulation results.

关键词： Common model current Photovoltaic Transformerless inverter Half bridge inverter Neutral leg Synchronverter

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Dual lie algebra representations of the rigid body motion

Dual lie algebra representations of the rigid body motion

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AIAA/AAS Astrodynamics Specialist Conference 2014

作者： Condurache, Daniel Burlacu, Adrian Dept. of Theoretical Mechanics Technical University of Iasi D. Mangeron Street no.59 700050 Iasi Romania Dept. of Automatic Control and Applied Informatics Technical University of Iasi D. Mangeron Street No.27 700050 Iasi Romania

ISBN: (数字)9781624103087

ISBN: (纸本)9781624103087

This main goal of this research is the development of a new parametrization technique for the motion of rigid bodies. Our study is based on the properties of dual tensors, more precisely their Lie group and Lie algebra. For the first time a complete parameterization framework is constructed, which gives the possibility of developing unitary direct solutions for computation of the main motion kinematic representation entities: dual Euler-Rodrigues parameters, dual Rodrigues vector, dual Wiener-Milenkovic parameters and dual quaternions. Using rigid bases of dual vectors, we provide direct computational solutions of the above motion kinematic entities. The novelty of our methods over existing solutions is discussed and the main advantages are revealed. Our solutions are free of coordinates and have direct implementation, both in numerical applications and in the symbolical ones.

关键词： Lie groups

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On board exact solution to the full body relative orbital motion problem

On board exact solution to the full body relative orbital mo...

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AIAA/AAS Astrodynamics Specialist Conference 2014

作者： Condurache, Daniel Burlacu, Adrian Dept. of Theoretical Mechanics Technical University of Iasi D. Mangeron Street No.59 700050 Iasi Romania Dept. of Automatic Control and Applied Informatics Technical University of Iasi D. Mangeron Street No.27 700050 Iasi Romania

ISBN: (数字)9781624103087

ISBN: (纸本)9781624103087

This paper provides a representation theorem of the exact solution for the relative orbital motion problem when the motion of the deputy satellite has 6-DOF. This problem is quite important, due to its numerous applications: spacecraft formation flying, rendezvous operations, autonomous missions. The common approach is to consider the relative translational and rotational dynamics for the chief-deputy spacecraft formation to be modeled using vector based formalisms. Our approach makes use of a complete tensor based construction which allows the division of the full body problem in a non-inertial frame into two classical full body problems in inertial frames: the Kepler problem and the Euler fixed-point problem.

关键词： Orbits

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Trading optimality for computational feasibility in a sample gathering problem

Trading optimality for computational feasibility in a sample...

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International Conference on System Theory, control, and Computing (ICSTCC)

作者： Marius Kloetzer Florin Ostafi Adrian Burlacu Dept. of Automatic Control and Applied Informatics “Gheorghe Asachi” Technical University of Iasi Romania

The work focuses on a sample gathering problem where a team of mobile robots has to collect and deposit into a storage facility all samples spread throughout the robotic environment. Recent results propose an optimal and off-line solution for this problem, based on a mixed integer linear programming optimization. However, this optimization may fail when there are many robots and/or samples. To overcome this problem, the current paper first formulates a quadratic programming relaxation that, at a price of obtaining sub-optimal robotic plans, is computationally feasible even when the optimal solution fails. Secondly, the paper comparatively analyzes the two possible formulations, in order to draw rules for choosing the appropriate optimization to be employed in a specific case.

关键词： Optimization Resource management Robot sensing systems Robot kinematics Complexity theory Linear programming

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Optimal multi-agent planning solution for a sample gathering problem

Optimal multi-agent planning solution for a sample gathering...

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IEEE International Conference on Automation, Quality and Testing, Robotics, AQTR

作者： Adrian Burlacu Marius Kloetzer Florin Ostafi Dept. of Automatic control and Applied Informatics Gheorghe Asachi Technical University of Iasi Romania

This research targets the problem of automatically planning a team of mobile agents such that they collect the samples scattered throughout an environment in minimum time. Each mobile agent can carry at most one sample at a time and it can travel a maximum total distance, given by agent's available energy. The environment is assumed already abstracted to a finite graph, where a node plays the role of the deposit where the samples should be gathered. Our solution consists in several steps that lead to a formulation of the initial problem as a Mixed Integer Linear Programming one. The solution yields a plan that imposes for each agent the samples and the order for collecting them. This result is optimal from the point of view of collecting all samples in minimum time.

关键词： Resource management Optimization Planning Robot sensing systems Linear programming Mobile agents

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