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Fault detection and isolation in current and voltage sensors of doubly-fed induction generators

IFAC Proceedings Volumes 2009年第8期42卷 1360-1365页

作者： Manuel Gálvez-Carrillo Michel Kinnaert Dept. of Control Engineering and System Analysis Université Libre de Bruxelles (ULB) 1050 Brussels Belgium

A fault detection and isolation (FDI) system for monitoring the stator current and voltage sensors of a doubly-fed induction generator (DFIG) for wind energy applications is presented. The FDI system is based on the model of the balanced three-phase signals, that is used to design a residual generator resting on the so-called Generalized Observer Scheme (GOS). Next, a decision system made of a combination of vector CUSUM (Cumulative Sum) algorithms is used in order to process the residual vector and achieve detection and isolation of incipient additive faults. The approach is validated via simulations of the DFIG controlled by a Linear Quadratic Gaussian (LQG) regulator.

关键词： Fault detection and isolation detector performance sensor failures electrical machines induction generators renewable energy systems Kalman filters state-space models

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Energy-Aware Sensor Selection and Scheduling in Wireless Sensor Networks *

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IFAC Proceedings Volumes 2009年第20期42卷 186-191页

作者： Eilyan Bitar Enrique Baeyens Kameshwar Poolla Dept. of Mechanical Engineering University of California Berkeley CA 94720 Dept. of Systems Engineering and Automatic Control University of Valladolid Paseo del Cauce s/n 47011 Valladolid Spain

This paper is concerned with system level energy management in wireless sensor networks. The network is required to conduct certain tasks which require information from individual sensors to be sent to a base station. Sensors cease functioning when they deplete their energy reserves or may fail abruptly due to random malfunctions. Sensor selection refers to the number of times sensors are interrogated, while sensor scheduling refers to the sequence in which these interrogations are conducted. A sensor management layer that isolates the system objectives from selection/scheduling is proposed. It is shown that sensor selection reduces to integer linear programming. Sensor scheduling is necessary when random sensor failures are considered or when the task definition is not stationary. Some general principles emerge. If all sensors are equally reliable, the optimal policy is to use the most energetic sensors first. If all sensors are equally energetic, the optimal policy is to use the least reliable sensor first.

关键词： Wireless Sensor Networks Energy Estimation

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Induced L2-norm minimization of glucose-insulin system for type i diabetic patients

Induced L2-norm minimization of glucose-insulin system for t...

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作者： Kovács, Levente Kulcsár, Balázs Benyó, Balázs Benyó, Zoltán Budapest University of Technology and Economics Dept. of Control Engineering and Information Technology Magyar tudósok krt. 2 Budapest H-1117 Hungary Technical University of Delf Delft Center for System and Control Delft 2628CD Netherlands

ISBN: (纸本)9783902661494

Using induced L2-norm minimization, a robust controller was developed for insulin delivery in Type I diabetic patients. The high-complexity nonlinear diabetic patient Sorensen-model was considered and Linear Parameter Varying methodology was used to develop open loop model and robust controller. Considering the normoglycemic set point (81.1 mg/dL), a polytopic set was created over the physiologic boundaries of the glucose-insulin interaction of the Sorensen-model. In this way, Linear Parameter Varying model formalism was defined. The robust control was developed considering input and output multiplicative uncertainties with two additional uncertainties from those used in the literature: sensor noise and worst case design for meal disturbance (60 g carbohydrate). © 2009 IFAC.

关键词： Robust control

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Economical implementation of control loops for multi-robot systems

Economical implementation of control loops for multi-robot s...

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15th International Conference on Neuro-Information Processing, ICONIP 2008

作者： Lopez-Guede, Jose Manuel Graña, Manuel Zulueta, Ekaitz Barambones, Oscar EHU System Engineering and Automatic Dept. Computational Intelligence Group UPV University College of Engineering of Vitoria C/Nieves Cano 12 Vitoria 00106 Spain EHU Computer Science and Artificial Intelligence Dept. Computational Intelligence Group UPV Basque Country University C/Paseo Manuel de Lazdizábal 1 San Sebastián 20018 Spain

ISBN: (纸本)3642024890

In spite of the multiple advantages that multi-robot systems offer, to turn them into a realistic option and to get their proliferation, they must be economically attractive. Multi-robot systems are composed of several robots that generally are similar, so if an economic optimization is done in one of them, such optimization can be replicated in each member. In this paper we deal with the economic optimization of each control loops of the subsystems that each robot must control individually. As the subsystems can be complex, we propose to use a Predictive control modeled by Time Delayed Neural Networks and implemented using very low cost Field Programmable Gate Arrays. © 2009 Springer Berlin Heidelberg.

关键词： Multipurpose robots

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Wells turbine control in wave power generation plants

Wells turbine control in wave power generation plants

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IEEE International Conference on Electric Machines and Drives (IEMDC)

作者： M. Amundarain Ormaza M. Alberdi Goitia I. Garrido Hernandez A. J. Garrido Hernandez Department Automatic Control and Systems Engineering University of Basque Country (UPV-EHU) Bilbao Spain Dept. Automatic Control and Systems Engineering University of the Basque Country Bilbao SPAIN Dept. Autom. Control & Syst. Eng. Univ. of the Basque Country Bilbao

ISBN: (纸本)9781424442515

In this paper a Wells turbine control is presented. For this purpose, a control scheme for the flow coefficient is derived based on the addition of external resistances in series with the rotor winding of the induction generator connected to the turbine. Due to the stalling behaviour, the generator increases its velocity as the flow coefficient of the turbine approaches the critical point at which the turbine losses power. The proposed control system does appropriately adapt the rotor resistance according to the entry pressure drop. To do so, the control implements a continuous resistance switching depending on the pressure drop and it will be demonstrated that the average power of the turbine and generator are significantly higher in the controlled case than in the uncontrolled one. It is stated that there exist an optimal value of external resistances for each specific range of pressure drop and it is verified that greater input pressure drop does not imply higher power output unless the stalling behaviour is avoided.

关键词： Turbines Power generation automatic control Rotors systems engineering and theory Induction generators Pressure control automatic generation control Power engineering and energy control systems

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Space-State Modeling and control of Tokamak Reactors

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IFAC Proceedings Volumes 2009年第13期42卷 431-436页

作者： I. Garrido A.J. Garrido G. Sevillano M. Alberdi M. Amundarain O. Barambones Dept. Automatic Control and Systems Engineering Basque Country University EUITI de Bilbao 48012 UPV / EHU Plza. de la Casilla 3 48012 Bilbao Spain Dept. Automatic Control and Systems Engineering Basque Country University EUITI de Bilbao Vitoria Nieves Cano 12 01006 Vitoria-Gasteiz Spain

Abstract Nuclear fusion has the potential to produce unlimited, clean energy, which presents itself as a reliable energy supply but it also helps to stop the threat of climate change that faces the world nowadays. However, to sustain the pulse duration long enough to produce the necessary energy, new controls have to be developed, composing a new application area of control engineering, with new and interesting challenges for the control community. In this sense, this paper deals with the modeling of tokamak nuclear fusion reactors. In order to control the creation of unstable modes in fusion processes, it is necessary to derive numerical models suitable for control strategies. The model presented in this paper addresses flux and energy conservation issues, discussing the mechanisms behind the creation of uncontrollable modes. The dynamics of the system is given by means of the energy functions which are solved for the currents in the structure, plasma current and plasma position. Thus, the equations for the state variables are derived based on the Hamiltonian equation of motion. In order to solve this system numerically, this model is linearized around an operation point by taking a Newton-Raphson step. Besides, the system output is completed by considering the equations for the flux and the poloidal field. Finally, the resulting low-order linear model is modified so as to obtain the corresponding state-space model which is verified by means of numerical experiments.

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Optimizing Hybrid control Trajectories by Model abstraction and Refinement

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IFAC Proceedings Volumes 2009年第17期42卷 298-303页

作者： Tina Paschedag Michael Fall Olaf Stursberg Institute of Control and System Theory Dept. of Electrical Engineering and Computer Science University of Kassel Technische Universität München

Techniques for optimal control of hybrid systems have to consider the complex interaction of continuous and discrete dynamics and are required to limit the computational complexity arising from the corresponding search spaces. This contribution proposes an approach to computing hybrid optimal control trajectories based on an iterative model-abstraction and refinement scheme. The hybrid automaton is mapped to an abstract representation which is enriched by cost information gained from graph. Candidate solutions are computed on the abstract level and are mapped back to the level of the hybrid model, where they are validated. A refinement step guides the search for (sub-) optimal hybrid control trajectories. The proposed approach is implemented for the optimization of the start-up procedure for a chemical reactor.

关键词： hybrid systems optimal control abstraction model refinement graph search

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Output feedback stabilization for min-max systems

Output feedback stabilization for min-max systems

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2009 International Conference on Information engineering and Computer Science, ICIECS 2009

作者： Wei, Hongyun Chen, Wende Wang, Yongji Wei, Qingyun Dept. of Control Science and Engineering Huazhong Univ. of Sci. and Tech. Wuhan China College of Computer Science South-Central Univ. for Nationalities Wuhan China Academy of Mathematics and System Sci. Chinese Academy of Sci. Beijing China Dept. of Control Sci. and Engineering Huazhong Univ. of Sci. and Tech. Wuhan China Dept. of Electronic Information Countermeasures Air Force Rader Academy Wuhan China

ISBN: (纸本)9781424449941

A variety of problems arising in communication networks, computer networks, automated manufacturing plants, etc. can be described by min-max-plus system models. Output feedback stabilization for the nonlinear, non-autonomous min-max-plus system (F, G, H) is studied in this paper. A new coloring graph structure is presented based on the new, complex conditions. The former research on new circuits of closed-loop max-plus projection system is considered with only one feedback edge, but more feedback edges should be included in the new circuits is pointed out in this paper. Finally, a sufficient condition for output feedback stabilization of min-max-plus system (F, G, H) is obtained. ©2009 IEEE.

关键词： Stabilization

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Environmental surface boundary tracking and description using a UAV with vision

Environmental surface boundary tracking and description usin...

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International Conference on Emerging Technologies and Factory Automation (ETFA)

作者： Pablo Lanillos José J. Ruz Gonzalo Pajares Jesus M. de la Cruz Dept. of Computer Architecture and Automatic Control Complutense University Madrid Spain Dept. of Software Engineering and Artificial Intelligence Complutense University Madrid Spain

This work presents a strategy to track and describe the boundary of an environmental surface using a sequence of incomplete boundary images coming from an UAV with a camera onboard. The algorithm uses all captured images to feed the trajectory, which drives the UAV towards the next point to take the next shot, until the identification is completed. The multiple patterns of the input image make the problem difficult. Our approach orders the points of the image to identify the existent edges, and computes the trajectory as a minimization problem using a multi-objective function that gathers information about the boundary and the polynomial that fit in these edges.

关键词： Unmanned aerial vehicles Cameras Data mining Shape Monitoring Spline Image sensors Fires Surveillance Computer architecture

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A Simulation Study of Consensus Speed over Scale-Free Networks

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IFAC Proceedings Volumes 2009年第22期42卷 74-79页

作者： Wei Sun YangQuan Chen Dept. of Automatic Control Beijing Institute of Technology Beijing 100081 China Center for Self-Organizing and Intelligent Systems (CSOIS) Dept. of Electrical and Computer Engineering Utah State University Logan UT 84322 USA

Scale-free network and consensus among multiple agents have both drawn quite much attention. To investigate the consensus speed over scale-free networks is the main topic in this paper. Given a set of different values for the power-law distribution parameter γ, and a set of different values for the minimum degree ( d min ) for the nodes, the algebraic connectivity (λ 2 ) of the network topology is studied, as well as the time ( t c ) (or iteration ( k c ), for discrete algorithm) taken to reach consensus. The results exhibit that λ 2 decreases while γ increases. The λ 2 increases monotonically as d min grows, and they fit very well in a linear relationship. t c (or k c ) decreases as γ reduces and d min increases. Via observing the behavior of the largest eigenvalue (λ n ) of the Laplacian of the network topology, we draw the conclusion that the robustness over time delays declines while the robustness over node-failures and edge-failures increases.

关键词： Scale-free network consensus algebraic connectivity network robustness

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