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International Conference on control, Decision and Information Technologies (CoDIT)

作者： Fares M'zoughi Soufiene Bouallègue Mounir Ayadi Aitor J. Garrido Izaskun Garrido Department of Automatic Control and Systems Engineering Automatic Control Group - ACG Bilbao Spain University of Tunis El Manar Laboratory of Research in Automatic Control - LA.R.A Tunis Tunisia

This paper deals with the modelling, simulation and control of a wave power plant installed in the northern cost of Spain. This plant is an onshore Oscillating Water Column (OWC) composed of a Wells turbine coupled to a Doubly Fed Induction Generator (DFIG). The power generated by the OWC is limited by the stalling behavior, a feature of the Wells turbine; therefore an airflow control is proposed in order to avoid the stalling phenomenon. This is achieved by regulating the airflow in the turbine duct by means of the throttle valve. The proposed control is based on a Proportional Integral (PI) controller. The results shows that the proposed control strategy provides a significant improvement of the generated power.

关键词： Turbines Torque Atmospheric modeling Mathematical model Rotors Stators

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Stable Interconnection of Continuous-Time Price-Bidding Mechanisms with Power Network Dynamics

Stable Interconnection of Continuous-Time Price-Bidding Mech...

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Power systems Computation Conference (PSCC)

作者： Tjerk Stegink Ashish Cherukuri Claudio De Persis Arjan Van Der Schaft Jorge Cortes Jan C. Willems Center for Systems and Control University of Groningen The Netherlands Automatic Control Laboratory ETH Zürich Department of Mechanical and Aerospace Engineering University of California San Diego

We study price-based bidding mechanisms in power networks fo r real-time dispatch and frequency regulation. On the market side, we consider the interaction between the independent system operator (ISO) and a group of generators involved in a Bertrand game of competition. The generators seek to maximize their individual profit while the ISO aims to solve the economic dispatch problem and to regulate the frequency. Since the generators are strategic and do not share their cost functions, the ISO engages the generators in a continuous-time price-based bidding process. This results in a coupling between the ISO-generator dynamics and swing dynamics of the network. We analyze its stability, establishing frequency regulation and the convergence to the efficient Nash equilibrium and the optimal generation levels. Simulation illustrate our results.

关键词： Generators ISO Power system dynamics Nash equilibrium Games Economics Mathematical model

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Stabilization of discrete-time switched linear systems: Lyapunov-Metzler inequalities versus S-procedure characterizations

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IFAC-PapersOnLine 2017年第1期50卷 3412-3417页

作者： Kundu A. Daafouz J. Heemels W.P.M.H. Robert Bosch Centre for Cyber-Physical Systems Indian Institute of Science Bangalore India Centre for Research in Automatic Control of Nancy University of Lorraine France Control Systems Technology Group Department of Mechanical Engineering Eindhoven University of Technology Netherlands

In this paper we study connections between Lyapunov-Metzler inequalities and S-procedure characterizations in the context of stabilizing discrete-time switched linear systems using min-switching strategies. We propose two generalized versions of S-procedure characterization along the lines of the generalized versions of Lyapunov-Metzler inequalities recently proposed in the literature. It is shown that the existence of a solution to the generalized version(s) of Lyapunov-Metzler inequalities is equivalent to the existence of a solution to the generalized version(s) of S-procedure characterization with a restricted choice of the scalar quantities involved in the latter. This recovers some of our earlier works on the classical Lyapunov-Metzler inequalities as a special case. We also highlight and discuss an open question of whether the generalized versions of S-procedure characterization are strictly less conservative than the generalized versions of Lyapunov-Metzler inequalities, which in turn are equivalent to periodic stabilizability as was recently shown. © 2017

关键词： Discrete-time switched linear systems Lyapunov-Metzler inequalities matrix inequalities min-switching strategy S-procedure characterizations stabilizability

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Variable speed control in wells turbine-based oscillating water column devices: optimum rotational speed

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IOP Conference Series: Earth and Environmental Science 2018年第1期136卷

作者： J Lekube A J Garrido I Garrido Automatic Control Group (ACG). Institute of Research and Development of Processes (IIDP). Department of Automatic Control and Systems Engineering Faculty of Engineering of Bilbao University of the Basque Country (UPV/EHU) Bilbao Spain

The effects of climate change and global warming reveal the need to find alternative sources of clean energy. In this sense, wave energy power plants, and in particular Oscillating Water Column (OWC) devices, offer a huge potential of energy harnessing. Nevertheless, the conversion systems have not reached a commercially mature stage yet so as to compete with conventional power plants. At this point, the use of new control methods over the existing technology arises as a doable way to improve the efficiency of the system. Due to the non-uniform response that the turbine shows to the rotational speed variation, the speed control of the turbo-generator may offer a feasible solution for efficiency improvement during the energy conversion. In this context, a novel speed control approach for OWC systems is presented in this paper, demonstrating its goodness and affording promising results when particularized to the Mutriku's wave power plant.

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Hybrid interconnection of iterative bidding and power network dynamics for frequency regulation and optimal dispatch

arXiv

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arXiv 2018年

作者： Stegink, Tjerk Cherukuri, Ashish de Persis, Claudio van der Schaft, Arjan Cortés, Jorge Jan C. Willems Center for Systems and Control University of Groningen Groningen9747 AG Netherlands Automatic Control Laboratory ETH Zürich Department of Mechanical and Aerospace Engineering University of California San Diego United States

This paper considers a real-time electricity market involving an independent system operator (ISO) and a group of strategic generators. The ISO operates a market where generators bid prices at which there are willing to provide power. The ISO makes power generation assignments with the goal of solving the economic dispatch problem and regulating the network frequency. We propose a multi-rate hybrid algorithm for bidding and market clearing that combines the discrete nature of iterative bidding with the continuous nature of the frequency evolution in the power network. We establish sufficient upper bounds on the inter-event times that guarantee that the proposed algorithm asymptotically converges to an equilibrium corresponding to an efficient Nash equilibrium and zero frequency deviation. Our technical analysis builds on the characterization of the robustness properties of the continuous-time version of the bidding update process interconnected with the power network dynamics via the identification of a novel LISS-Lyapunov function. Simulations on the IEEE 14-bus system illustrate our results. Copyright © 2018, The Authors. All rights reserved.

关键词： Electric power transmission networks

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Plug-and-play Self-configuration and Integration in Swarm Robotics

Plug-and-play Self-configuration and Integration in Swarm Ro...

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Roedunet International Conference (RoEduNet)

作者： Ioan Marica Dragos C. Popescu Monica Patrascu Department of Automatic Control and Systems Engineering University Politehnica of Bucharest Romania Extreme Light Infrastructure - Nuclear Physics (ELI-NP) / Horia Hulubei National Institute of Physics and Nuclear Engineering Bucharest Romania

Autonomous robotic systems are becoming more common, raising the problem of configuring and coordinating a large number of robotic entities. Swarm robotics is one solution to these problems. We sought to develop a method for facilitating configuration in swarm robotic systems which communicate over Wi-Fi. For this, we took inspiration from ad-hoc networks which provide some self-configuration capabilities. We developed a plug-and-play algorithm which requires user intervention only for the first robot to be configured, while for further robots the configuration is automatically. We implemented the algorithm on a mobile robot prototype (CRIS) and tests were performed on a small number of CRIS robots. The results revealed that the algorithm performed as expected, with swarm configuration being completed in less than one minute for a group of three robots. Our proposed algorithm is a promising first step in a wide range of self-configuration methods for mobile robotic systems and beyond.

关键词： Robot sensing systems Robot kinematics Wireless fidelity Ad hoc networks Software

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Modeling and MPPT control of a Tidal stream generator

Modeling and MPPT control of a Tidal stream generator

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International Conference on control, Decision and Information Technologies (CoDIT)

作者： Khaoula Ghefiri Soufiene Bouallègue Joseph Haggège Izaskun Garrido Aitor J. Garrido Department of Automatic Control and Systems Engineering Automatic Control Group - ACG Bilbao Spain University of Tunis El Manar Laboratory of Research in Automatic Control - LA.R.A Tunis Tunisia Universidad del Pais Vasco Bilbao PaÃs Vasco ES

This paper deals with the design, modeling and control of a Tidal Stream Generator (TSG) system including a tidal turbine, a rotor shaft and a Doubly Fed Induction Generator (DFIG). Below high tidal speed the system is regulated so that for every tidal velocity reaches the maximum power. A rotational speed control based-Maximum Power Point Tracking (MPPT) for a TSG is investigated to provide the suitable rotational speed to the system in order to track the maximum power and thus keeping the pitch angle null. Two study cases were proposed to test the performance of the control strategy. The obtained results show that the proposed control provide satisfactory tracking of the MPPT reference.

关键词： Turbines Velocity control Rotors Tides Maximum power point trackers

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A novel approach to identify resonant MHD wave modes in solar pores and sunspot umbrae: B-ω analysis

arXiv

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arXiv 2021年

作者： Stangalini, Marco Jess, D.B. Verth, G. Fedun, V. Fleck, B. Jafarzadeh, S. Keys, P.H. Murabito, M. Calchetti, D. Aldhafeeri, A.A. Berrilli, F. Del Moro, D. Jefferies, S.M. Terradas, J. Soler, R. ASI Italian Space Agency Via del Politecnico snc Rome00133 Italy Astrophysics Research Centre School of Mathematics and Physics Queen’s University Belfast BelfastNorthern IrelandBT7 1NN United Kingdom Department of Physics and Astronomy California State University Northridge NorthridgeCA91330 United States Plasma Dynamics Group School of Mathematics and Statistics The University of Sheffield Hicks Building Hounsfield Road SheffieldS3 7RH United Kingdom Plasma Dynamics Group Department of Automatic Control and Systems Engineering The University of Sheffield SheffieldS1 3JD United Kingdom ESA Science and Operations Department NASA/GSFC Code 671 GreenbeltMD20771 United States Rosseland Centre for Solar Physics University of Oslo P.O. Box 1029 Blindern OsloNO-0315 Norway Institute of Theoretical Astrophysics University of Oslo P.O. Box 1029 Blindern OsloNO-0315 Norway INAF-OAR National Institute for Astrophysics Monte Porzio Catone RM00041 Italy Department of Physics University of Rome Tor Vergata Via della Ricerca Scientifica 1 Rome00133 Italy Mathematics and Statistic Department Faculty of Science King Faisal University Al-Hassa P.O. Box 400 Hofuf31982 Saudi Arabia Department of Physics and Astronomy Georgia State University GA30303 United States Institute for Astronomy University of Hawaii HI96768-8288 United States Departament de Física Universitat de les Illes Balears Palma de MallorcaE-07122 Spain Universitat de les Illes Balears Palma de MallorcaE-07122 Spain

The umbral regions of sunspots and pores in the solar photosphere are generally dominated by 3 mHz oscillations, which are due to p-modes penetrating the magnetic region. In these locations, wave power is also significantly reduced with respect to the quiet Sun. However, here we study a pore where the power of the oscillations in the umbra is not only comparable, or even larger than that of the quiet Sun, but the main dominant frequency is not 3 mHz as expected, but instead 5 mHz. By combining Doppler velocities and spectropolarimetry and analysing the relationship between magnetic field strength and frequency, the resultant B − ω diagram reveals distinct ridges which are remarkably clear signatures of resonant MHD oscillations confined within the pore umbra. In addition to velocity oscillations, we demonstrate that these modes are also accompanied by magnetic oscillations, as predicted from MHD theory. The novel technique of B − ω analysis, proposed in this Letter, opens an exciting new avenue for identifying MHD wave modes in the umbral regions of both pores and sunspots. Copyright © 2021, The Authors. All rights reserved.

关键词： Wave power

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A Robust MPP Tracker Based on Sliding Mode control for a Photovoltaic Based Pumping System

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International Journal of Automation and computing 2017年第4期14卷 489-500页

作者： Farhat Maissa Oscar Barambones Sbita Lassad Aymen Fleh Department of Electrical Electronics and Communications Engineering American University of Ras A1 Khaimah Ras AI Khaimah 10021 UAE Advanced Control Group Faculty of Engineering of Vitoria-Gasteiz University of the Basque Country Bilbao Spain Electrical and Automatic Engineering Department Engineering School of Gabes University of Gabes Zrig Gabes 6029 Tunisia

In this paper, a mathematical model of the photovoltaic （PV） pumping system＇s main components is firstly established. Then, the design of maximum power point tracking （MPPT） stage that ensures battery charging is described. This work is motivated by the need of photovoltaic generator （PVG） that efficiently extracts maximum power. The PVG is a special source of energy which has nonlinear current-voltage characteristics depending on variations in temperature and solar irradiance. In order to achieve the MPPT operating goals, a special interest is focused on the variable structure sliding mode （SM） control strategy and the classic perturb and observe （P＆O） algorithm. The permanent magnet synchronous motor （PMSM） is selected as a pump driver. The field oriented control is performed as the motor drive strategy. Simulation results show a high level of efficiency, obtained with the proposed PV based pumping system. The performance comparison between SM controller and P＆O controller has been carried out to demonstrate the effectiveness of the former in drawing more energy and a fast response against irradiation disturbances.

关键词： Photovoltaic （PV） pump storage battery boost sliding mode control （SMC） maximum power point tracking （MPPT）.

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Ambient Assisted control using Smart Luminaires

Ambient Assisted Control using Smart Luminaires

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Zooming Innovation in Consumer Electronics International Conference (ZINC)

作者： Iuliana Marin Ionel–Bujorel Păvăloiu Nicolae Goga Melania Nitu Ionut Drăghici Department of Engineering in Foreign Languages University POLITEHNICA of Bucharest Bucharest Romania Molecular Dynamics Group University of Groningen Groningen Netherlands Faculty of Automatic Control and Computers University POLITEHNICA of Bucharest Bucharest Romania

The population aging, the need to reduce the cost of elderly care, as well as to increase security and energy efficiency have led to the emergence of many home monitoring systems. However, most of these systems are expensive, are not standardized, are complicated to implement (individualized wiring, wireless nodes) and can only be used with qualified personnel. Our light bulb prototype aims to reduce such deficiencies as well as remove the obstacles to adopting such systems by reducing costs and simplifying installation. The proposed solution aims to capitalize on existing electrical and lighting equipment, to set up a monitoring system only by replacing the luminaires in the existing electrical system with other lighting sources developed specifically for this purpose. Through the periodic replacement process and based on the current trend in light-emitting diode usage, these smart luminaires can be gradually introduced to supervise the location within houses, mostly elders' homes who live alone.

关键词： Monitoring Bluetooth Mobile handsets Senior citizens Lighting Silver Mathematical model

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