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Comparison of TDNN and RNN performances for neuro-identification on small to medium-sized power systems

Comparison of TDNN and RNN performances for neuro-identifica...

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IEEE Symposium on Computational Intelligence Applications In Smart Grid (CIASG)

作者： Diogenes Molina Jiaqi Liang Ron Harley Ganesh K. Venayagamoorthy Department of Electrical and Computer Engineering Georgia Institute of Technology Atlanta GA USA Real-Time Power and Intelligent System Laboratory Missouri University of Science and Technology Rolla MO USA

For Artificial Neural Networks (ANN) to become more widely used in power systems and the future smart grids, ANN based algorithms must be capable of scaling up as they try to identify and control larger and larger parts of a power system. This paper goes through the process of scaling up an ANN based identifier as it is driven to identify increasingly larger portions of a power system. Distributed and centralized approaches for scaling up are taken and the pros and cons of each are presented. The New England/New York 68-bus power network is used as the test bed for the studies. It is shown that while a fully-connected (centralized) ANNs is capable of identification of the system with appropriate accuracy, the increase in the training times required to obtain an acceptable set of weights becomes prohibitive as the system size is increased.

关键词： Artificial neural networks power system dynamics Recurrent neural networks Training Generators Testing

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Study on aging characteristics of mineral oil/natural ester mixtures-paper insulation

Study on aging characteristics of mineral oil/natural ester ...

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International Conference on Conduction and Breakdown in Dielectric Liquids

作者： Ruijin Liao Jian Hao Lijun Yang Stanislaw Grzybowski The State Key Laboratory of Power Transmission Equipment & System Security and New Technology Chongqing University Chongqing China High Voltage Laboratory Department of Electrical and Computer Engineering Mississippi State University MS USA

Transformer is one of the most critical equipment insuring the safe operation of power grids. The aging of insulation materials (mainly parts are the insulation oil and transformer paper) decide the operational life of the transformer. This paper is aimed at improving the anti-aging properties of power transformer via using new mineral oil/natural ester mixtures. The aging characteristics of mixed insulating oil-paper insulation and mineral oil-paper insulation were provided through 264 days' accelerated thermal aging at 110°C. The color of the oil, oil acidity, degree of polymerization (DP) of the paper and the thermal stability behavior of oil-paper insulation with different aging status were compared. Results show that the mixed insulating oil can not only restrain the oil oxidation itself, but also can restrain the aging rate of the paper immersed in the mixed insulating oil. The thermal stability of oil-paper insulation could be also improved by using the mixed insulating oil.

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Design of Global power systems Stabilizer to Damp Interarea Oscillations Based on Wide-Area Collocated Control Technique

Design of Global Power Systems Stabilizer to Damp Interarea ...

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IEEE power and Energy Society General Meeting

作者： Jing Ma Tong Wang Zengping Wang Jie Wu James S. Thorp School of Electrical and Electronic Engineering North China Electric Power University and also with the Bradley Department of Electrical and Computer Engineering Virginia Polytechnic Institute and State University Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control under Ministry of Education North China Electric Power University State Nuclear Electric Power Planning Design and Research Institute Bradley Department of Electrical and Computer Engineering Virginia Polytechnic Institute and State University

ISBN: (纸本)9781457710001

This paper develops a systematic procedure of designing global power system stabilizers (GPSSs) based on collocated control to enhance the damping during interarea oscillations. The availability of remote signals from phasor measurement units (PMUs) enables the wide-area control in large scale systems. The closed loop eigenvalues are excluded from a region of the complex plane by the collocated control algorithm guaranteeing that low frequency modes must be damped. The optimum locations for GPSSs were selected using controllability. The damping performance of a 16-machine, 68-bus study system reinforced with GPSSs is examined in the frequency and time domains. The simulation results show that the control scheme is able to damp out interarea oscillations following possible disturbances.

关键词： PMUs Interarea oscillations Collocated control Global power system stabilizers Phasor measurement units absorption of shock dinitrophenyl-aminopropyl-methylamine Oscillations Control technology Complex Plane power system stability computer algorithms

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A novel type of trigonometric neural network trained by Extended Kalman Filter

A novel type of trigonometric neural network trained by Exte...

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International Workshop on Advanced Computational Intelligence (IWACI)

作者： M. Norouzi M. Mansouri M. Teshnehlab M. Aliyari Shoorehdeli Faculty of Engineering Department of Computer Engineering Science and Research Branch Islamic Azad University Iran Intelligent System Laboratory (ISLAB) Faculty of Electrical Engineering Control Department K.N. Toosi University of Technology Tehran Iran Faculty of Electrical Engineering Department of Mechatronics Engineering Advanced Process Automation &Control Laboratory (APAC) K.N. Toosi University of Technology Tehran Iran

In this study, a new type of trigonometric neural network is presented by adding frequency and phase to trigonometric activation functions. The proposed trigonometric neural network has more flexibility in comparison with conventional trigonometric neural networks and even other types of neural networks. Due to the low convergence rate and high posibility of trapping in a local minimum of backpropagation algorithm, Extended Kalman Filter algorithm is used to train the neural network's parameters which they appear in a nonlinear form. The Simulation of the suggested neural network based on the prediction of Mackey-Glass time series and identification of a nonlinear dynamic ystem reveals the efficiency of the proposed network. To show the efficiency of this method, the results are compared with the results of the others.

关键词： Biological neural networks Kalman filters Equations Neurons Vectors Covariance matrix Mathematical model

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Distributed power and Rate Allocation with Fairness for Cognitive Radios in Wireless Ad Hoc Networks

Distributed Power and Rate Allocation with Fairness for Cogn...

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2011 IEEE Global Telecommunications Conference - GLOBECOM 2011

作者： Songtao Guo Yunqiang Zhang Yuanyuan Yang High Performance Networking Research Center State Key Laboratory of Power Transmission Equipment and System Security College of Computer Science Chongqing University Chongqing China Department of Electrical and Computer Engineering Stony Brook University Stony Brook NY USA

In this paper, we propose a distributed resource allocation framework for cognitive radio networks by using the orthogonal frequency division multiple access (OFDMA) modulation. We jointly consider the constraints of quality of service (QoS), maximum power, and minimum rates in the network to obtain optimal available subcarrier sets and transmission power. The fairness of resource allocation is guaranteed by incorporating the probability that a subcarrier is occupied into the link capacity expression. We present a distributed subcarrier selection and power allocation algorithm and evaluate the algorithm through simulations. Our results confirm that the proposed algorithm outperforms the existing algorithms in terms of throughput, the number of secondary links admitted, and the fairness of resource allocation.

关键词： Resource management Optimization Cognitive radio Ad hoc networks Interference Throughput Joints

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Containment control of networked Lagrange systems with group dispersion and cohesion behaviors

Containment control of networked Lagrange systems with group...

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Chinese Control Conference (CCC)

作者： Ziyang Meng Zongli Lin Wei Ren Department of Automation Shanghai Jiao Tong University and Key Laboratory of System Control and Information Processing Ministry of Education of China 200240 China Charles L. Brown Department of Electrical and Computer Engineering University of Virginia P.O. Box 400743 Charlottesville 22904-4743 U.S.A. Department of Electrical and Computer Engineering Utah State University Logan 84322 U.S.A.

In this paper, distributed containment control with group dispersion and cohesion behaviors are discussed for a group of Lagrange systems. Both the cases of constant leaders' generalized coordinate derivatives and time-varying leaders' generalized coordinate derivatives are considered. The proposed control algorithms are shown to obtain velocity matching, connectivity maintenance and collision avoidance. In addition, the sum of the steady-state distances between followers and the convex hull formed by the leaders is shown to be bounded and this bound is explicitly given.

关键词： Lead Dispersion Topology Sensors Laplace equations Maintenance engineering Algorithm design and analysis

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Near-infrared based nighttime pedestrian detection by combining multiple features

Near-infrared based nighttime pedestrian detection by combin...

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International Conference on Intelligent Transportation

作者： Yu-Chun Lin Yi-Ming Chan Luo-Chieh Chuang Li-Chen Fu Shih-Shinh Huang Pei-Yung Hsiao Min-Fang Luo Intelligent Robot and Automation Laboratory Department of Computer Science and Information Engineering National Taiwan University Taipei Taiwan National Taiwan University Taipei TW Department of Computer and Communication Engineering National Kaohsiung First University of Science and Technology Kaohsiung Taiwan Department of Electrical Engineering National University of Kaohsiung Kaohsiung Taiwan System development center Chung-Shan Institute of Science and Technology Longtan Shaiang Taoyuan Taiwan

Pedestrian detection is important in the computer vision field. In the nighttime, pedestrian detection is even more valuable. In this paper, we address the issue of detecting pedestrians in video streams from a moving camera at nighttime. Most nighttime human detection approaches only use single feature extracted from images. The effective image features in daytime environment may suffer from textureless, high contrast and low light problems at night. To deal with these issues, we first segment the foreground by using the proposed Smart Region Detection approach to generate candidates. Then we design a nighttime pedestrian detection system based on the AdaBoost and the support vector machine (SVM) classifiers with contour and histogram of oriented gradients (HOG) features to effectively recognize pedestrians from those candidates. Combining different type of complementary features improve the detection performance. Results show that our pedestrian detection system is promising in the nighttime environment.

关键词： Feature extraction Image segmentation Cameras Humans Databases Lighting Support vector machines

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Energy Optimal Selection of Access Points in Wireless Sensor Networks

Energy Optimal Selection of Access Points in Wireless Sensor...

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International Conference on Innovative Mobile and Internet Services in Ubiquitous Computing (IMIS)

作者： Qin Xin Xiaolan Yao Wei He State Key Laboratory of Power Transmission Equipment & System Security and New Technology College of Electrical Engineering Chongqing University China Department of Applied Mathematics Universite Catholique de Louvain Louvain-la-Neuve Belgium School of Computer Science National University of Defense Technology Changsha China

In a Wireless Sensor Networks (WSN), there are normally one or several sensor nodes working as Access Points (AP), which are able to provide a relay for other sensors to an external Internet connection. Since WSNs are resource constrained, the selection of APs is very crucial in economizing power usage. In this paper, we study the optimal selection of APs to maximize the WSN lifetime. This issue is closely related to routing protocols in WSN. We propose a new adaptive multi-path routing protocol to reduce the energy consumption and guarantee QoS requirements with respect to transmission delay. In this paper, we formulate the issues we mentioned above as a non-linear NP-hard optimization problem. Due to the high computation complexity of this problem, we proposed two polynomial-time approximation algorithms to optimally select APs in the WSN that based on the framework in. Combining with our new adaptive multi-path routing protocol, our preliminary simulation results show that our schemes can save more than 20% energy compared with the existing APs selection schemes with single path routing protocols.

关键词： Wireless sensor networks Routing protocols Wireless communication Equations Mobile communication Routing Internet

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One Day Smart Grid Supersession - Analytics and Integration

One Day Smart Grid Supersession - Analytics and Integration

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General Meeting of the IEEE-power-and-Energy-Society (PES)

作者： Liu, W-H Edwin McArthur, Stephen Giri, Jay Miu, Karen Pratt, Rob Wen, Jun Uluski, Bob Dow, Luther Labut, Gerard IEEE Computing and Analytical Methods Subcommittee United States IEEE PES Intelligent Systems Subcommittee United States IEEE PES Multi-Agent System Working Group United States Power Systems Technology and Strategic Initiatives ALSTOM Grid Redmond WA United States Electrical and Computer Engineering Department Drexel University United States Pacific Northwest National Laboratory's (PNNL's) Smart Grid R and D Program U.S. Department of Energy United States Transmission and Interconnection Planning Group Southern California Edison (SCE) Company United States WECC Modeling and Validation Working Group United States EPRI Power Delivery and Utilization Area United States Distribution and West Coast Operations Quanta Technology United States Distribution Operations SmartCurrentssm Program Strategy DTE Energy Detroit MI United States

ISBN: (纸本)9781457710018

The effort of "Smart Grid" is to modernize grid infrastructure and build-in intelligence to power grids and delivery systems, and their interfaces to customer premises. However, the perspectives range from an emphasis on infrastructure to an emphasis on new paradigm-shifting applications. Alternatively, the smart grid can be thought of as the advanced information technologies that enable the desired analytical applications. As a general understanding, we believe that Smart Grid needs to integrate power system analysis, computing and economics to enhance grid reliability, efficiency, and security, and contributes to the climate change strategic goal. In this Supersession, the analytics that empowers smart grid applications is discussed;and the practical implementation and integration challenges will be presented.

关键词： smart grid analytical applications system integration

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Moisture Equilibrium in Vegetable Oil and Paper Insulation system

Moisture Equilibrium in Vegetable Oil and Paper Insulation S...

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Annual Report Conference on electrical Insulation and Dielectric Phenomena

作者： Zhaotao Zhang Jian Li Stanislaw Grzybowski Ping Zou State Key Laboratory of Power Transmission Equipment & System Security and New Technology Department of High Voltage and Insulation Engineering Chongqing University Chongqing 400044 China High Voltage Laboratory Department of Electrical and Computer Engineering Mississippi State University Mississippi State MS 39762 USA

ISBN: (纸本)9781457709852

This paper presents an experiment system to measure the moisture equilibrium curves of vegetable oil-paper insulation. The moisture equilibrium curves of vegetable oilpaper insulation are plotted by indirect methods. Comparison between the moisture-equilibrium curves of vegetable oil-paper insulation and those of mineral oil-paper insulation is also presented. The experiment and analysis results shows that the moisture content in vegetable insulating oil is much greater than that in mineral insulating oil at the same moisture content in insulation paper.

关键词： Vegetable Equilibrium Insulation

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