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Dynamic Modeling of Wind Farms with Fixed-Speed Wind Turbine Generators

Dynamic Modeling of Wind Farms with Fixed-Speed Wind Turbine...

引用

2007 IEEE Power engineering Society General Meeting (PES 2007), vol.10

作者： Wei Qiao Ronald G. Harley Ganesh K. Venayagamoorthy Intelligent Power Infrastructure Consortium (IPIC) School of Electrical and Computer Engineering Georgia Institute of Technology Atlanta GA USA University of KwaZulu-Natal Durban South Africa Real-Time Power and Intelligent Systems Laboratory Department of Electrical and Computer Engineering University of Missouri Rolla Rolla MO USA

A wind farm typically consists of a large number of individual wind turbine generators (WTGs) connected by an internal electrical network. To study the impact of wind farms on the dynamics of the power system, an important issue is to develop appropriate wind farm models to represent the dynamics of many individual WTGs. This paper presents various dynamic models, including a detailed model and three reduced-order equivalent models, of wind farms with fixed-speed WTGs. These models are developed and compared by simulation studies in the PSCAD/EMTDC environment under different wind velocity and fluctuation conditions as well as gird fault conditions. Concluding remarks are provided on how to choose an appropriate wind farm model for power system dynamic and transient studies.

关键词： Detailed model Equivalent model Fixed-speed wind turbine Squirrel-cage induction generator Wind farm

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NONPARAMETRIC ENTROPY-BASED COUPLED MULTI-SHAPE MEDICAL IMAGE SEGMENTATION

NONPARAMETRIC ENTROPY-BASED COUPLED MULTI-SHAPE MEDICAL IMAG...

引用

IEEE International Symposium on Biomedical Imaging

作者： Alireza Akhoundi-Asl Hamid Soltanian-Zadeh School of Cognitive Sciences Institute of Studies in Theoretical Physics and Mathematics Tehran Iran Control and Intelligent Processing Center of Excellence (CIPCE) School of Electrical and Computer Engineering University of Tehran Tehran Iran Image Analysis Laboratory Radiology Department Henry Ford Health System Detroit MI USA

ISBN: (纸本)9781424406715;1424406714

We propose a 3D nonparametric, entropy-based, coupled, multishape approach for the segmentation of subcortical brain structures in magnetic resonance images (MRI). Our method uses PCA to capture structures variability. Because of complex relationships of pose and shape of the coupled structures, we only use their shape and size relation. To this end, we apply separate registrations of the structures. For each structure, we consider a similarity transform using seven parameters. In addition, to generate most accurate results, we estimate probability density functions (pdf) iteratively. The proposed method minimizes an entropy-based energy function using quasi-Newton algorithm. To improve the results, we use analytical derivatives. Sample results are given for the segmentation of putamen, thalamus and caudate illustrating the impact of coupling on the accuracy of the results.

关键词： Biomedical imaging Image segmentation Shape Couplings Brain Magnetic resonance Magnetic resonance imaging Principal component analysis Probability density function Iterative algorithms

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Recent advances in networked control systems

Recent advances in networked control systems

引用

2007 International Conference on control, Automation and systems (ICCAS 2007), vol.5

作者： Zengqi Sun Hongbo Li Yan Wang Department of Computer Science and Technology State Key Laboratory of Intelligent Technology and Systems Tsinghua University Beijing China School of Automation Science and Electrical Engineering Beijing Aeronautics and Astronautics University Beijing China

This paper presents a comprehensive overview of the current state of research in the area of Networked control systems (NCSs) first. Then two modeling and control methods are introduced for NCSs in details. The first one is a stochastic control method, which investigates the H{sub}∞ control problem for NCSs with random network-induced delay. The second one is a switch control method, which focuses on solving the stabilization problem for NCSs in discrete-time domain, where both network-induced delay and packet dropout are taken into account. Illustrative examples are given to demonstrate the effectiveness of the proposed approaches. Finally, this paper concludes with the discussion of possible future development of NCSs from a control perspective.

关键词： Networked control systems (NCSs) Network-induced delay Packet dropout Stability H{sub}∞

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Who moved?! An investigation into distribution of actions and behaviors in a multi agent system

Who moved?! An investigation into distribution of actions an...

引用

2006 IEEE International Conference on Mechatronics, ICM

作者： Daneshvar, Roozbeh Lucas, Caro Artificial Intelligence and Robotics Lab. Faculty of Electrical and Computer Engineering University of Tehran Tehran Iran Center of Excellence for Control and Intelligent Processing Faculty of Electrical and Computer Engineering University of Tehran and School of Intelligent Systems Tehran Iran

ISBN: (纸本)0780397134

In this paper we have considered systems in which agents communicate via their environment. In these systems the agents do not have direct and explicit communication with each other and instead they have implicit communication which is performed via the environment they are located in. Different kinds of environment elements are considered to be changed while on the other hand for all of these situations there is a change in the environment and this change means potential stimuli that fires behaviors of agents for future. It is considered that if we can find a track of changes in the environment and find the roots of a movement in an agent that is originally made by another agent of the group. © 2006 IEEE.

关键词： Multi agent systems

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Detecting incorrect intentions of trainees by context deviations

Detecting incorrect intentions of trainees by context deviat...

引用

15th Conference on Behavior Representation in Modeling and Simulation 2006

作者： Fernlund, Hans Gonzalez, Avelino J. Ekblad, Joakim Intelligent Systems Laboratory School of Electrical Engineering and Computer Science University of Central Florida Orlando FL 32816-2450 United States

ISBN: (纸本)9781604238969

Conducting After Action Reviews that provides feedback to the majority of the participants in large exercises, with trainees that may reside in different locations can be very complicated. This process requires extensive time and resources, and the review might be limited to the few most important tactical decisions made. However, the evaluation of an exercise is highly important to improve performance of the trainees. This paper presents the latest results in research to automate the After Action Review. Here we present how the intent of a trainee might deviate from the desirable intent and be detected in any training scenario. The technique is to use an expert modeling paradigm based on contexts together with a deviation detection mechanism that can infer the context of the trainee in order to detect discrepancies between him and the expert model. Furthermore, the model is automatically created by observing real human performance. Preliminary results of this approach are described.

关键词： Behavioral research

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Real-time implementation of a STATCOM on a wind farm equipped with doubly fed induction generators

Real-time implementation of a STATCOM on a wind farm equippe...

引用

2006 IEEE Industry Applications Conference - Forty-First IAS Annual Meeting

作者： Wei, Qiao Venayagamoorthy, Ganesh K. Harley, Ronald G. Intelligent Power Infrastructure Consortium School of Electrical and Computer Engineering Georgia Institute of Technology Atlanta GA 30332-0250 United States Real-Time Power and Intelligent Systems Laboratory Department of Electrical and Computer Engineering University of Missouri-Rolla Rolla MO 65409-0249 United States

ISBN: (纸本)1424403642

Voltage stability is a key issue to achieve the uninterrupted operation of wind farms equipped with doubly fed induction generators (DFIGs) during grid faults. A Static Synchronous Compensator (STATCOM) is applied to a power network which includes a DFIG driven by a wind turbine, for steady state voltage regulation and transient voltage stability support. The control schemes of the DFIG rotor-side converter, grid-side converter and the STATCOM are suitably designed and coordinated. The system is implemented in real-time on a RealTime Digital Simulator (RTDS®). Results show that the STATCOM improves the transient voltage stability and therefore helps the wind turbine generator system to remain in service during grid faults. © 2006 IEEE.

关键词： Wind turbines

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Genetic Approach for Neural Scheduling of Multiobjective Fuzzy PI controllers

Genetic Approach for Neural Scheduling of Multiobjective Fuz...

引用

International Workshop on Genetic and Evolving systems, GEFS

作者： Ginalber Serra Celso Bottura Control and Intelligent Systems Laboratory School of Electrical and Computer Engineering State University of Campinas Sao Paulo Brazil

This paper presents an intelligent gain scheduling adaptive control approach for nonlinear plants. A fuzzy PI discrete controller is optimally designed by using a multiobjective genetic algorithm for simultaneously satisfying the following specifications: overshoot and settling time minimizations and output response smoothing. A neural gain scheduler is designed, by the backpropagation algorithm, to tune the optimal parameters of the fuzzy PI controller at some operating points. Simulation results are shown for adaptive speed control of a DC servomotor used as actuator of robotic manipulators

关键词： Fuzzy control Adaptive control Optimal control Algorithm design and analysis Adaptive scheduling Fuzzy sets Genetic algorithms Minimization methods Smoothing methods Backpropagation algorithms

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Who Moved?! An Investigation into Distribution of Actions and Behaviors in a Multi Agent System

Who Moved?! An Investigation into Distribution of Actions an...

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International Conference on Mechatronics (ICM)

作者： Roozbeh Daneshvar Caro Lucas Artificial Intelligence and Robotics Laboratory Faculty of Electrical and Computer Engineering University of Tehran Tehran Iran Center of Excellence for Control and Intelligent Processing Faculty of Electrical and Computer Engineering School of Intelligent Systems IPM University of Tehran Tehran Iran

关键词： Artificial intelligence intelligent robots Fires Tracking Process control Communication system control control systems intelligent control Optical computing intelligent systems

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Synchronous reference frame based active filter current reference generation using neural networks

Synchronous reference frame based active filter current refe...

引用

IECON 2006 - 32nd Annual Conference on IEEE Industrial Electronics

作者： Mazumdar, Joy Harley, Ronald G. Venayagamoorthy, Ganesh K. School of Electrical and Computer Engineering Georgia Institute of Technology 777 Atlantic Drive NW Atlanta GA 30332 United States Real-Time Power and Intelligent Systems Laboratory University of Missouri-Rolla 1870 Miner Circle Rolla MO 65409 United States

ISBN: (纸本)1424401364

The increased use of nonlinear devices in industry has resulted in direct increase of harmonic distortion in the industrial power system in recent years. The significant harmonics are almost always 5th, 7th, 11th and the 13th with the 5th harmonic being the largest in most instances. Active filter systems have been proposed to mitigate harmonic currents of the industrial loads. The most important requirement for any active filter is the precise detection of the individual harmonic component's amplitude and phase. Fourier transform based techniques provide an excellent method for individual harmonic isolation, but it requires a minimum of two cycles of data for the analysis, does not perform well in the presence of subharmonics which are not integral multiples of the fundamental frequency and most importantly introduces phase shifts. To overcome these difficulties, this paper proposes a Multilayer Perceptron Neural Network trained with back-propagation training algorithm to identify the harmonic characteristics of the nonlinear load. The operation principle of the synchronous-reference-frame-based harmonic isolation is discussed. This proposed method is applied to a thyristor controlled dc drive to obtain the accurate amplitude and phase of the dominant harmonics. This technique can be integrated with any active filter control algorithm for reference generation. ©2006 IEEE.

关键词： Active filters

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Robust Direct Field Oriented control of Induction Motors Using Adaptive Observer

Robust Direct Field Oriented Control of Induction Motors Usi...

引用

IEEE International Symposium on Industrial Electronics (ISIE)

作者： A. Mezouar M. K. Fellah S. Hadjeri O. Touhami Y. Sahali Intelligent Control and Electrical Power Systems Laboratory Department of Electrical Engineering Djillali Liabes University Sidi Bel-Abbes Algeria Research Laboratory of Electrotechnics National Polytechnic School Algeria

This paper deals with the simultaneous estimation of the rotor flux and the rotor resistance of induction motors by a modified Luenberger observer. The proposed observer assumes that only the motor speed and the stator currents are measured. Its corrective terms are based on the derivative of stator currents. The use of the Lyapunov's theory for the flux observer stability analysis permits to give an adaptive law for the on-line rotor resistance estimation. This observer is combined with a direct field oriented control to achieve a robust speed and flux control. Simulation results are presented to evaluate the performances of this control-observer structure scheme

关键词： Robust control Induction motors Programmable control Adaptive control Rotors Stators Current measurement electrical resistance measurement Velocity measurement Stability analysis

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