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Midwest Symposium on Circuits and systems (MWSCAS)

作者： Jie Wu Jinjun Xiong Prasenjit Shil Yiyu Shi IBM Thomas J. Watson Research Center Yorktown Heights NY Dept. of Electrical & Computer Engineering Missouri University of Science and Technology MO Ameren Corporation Saint Louis MO

Placing appropriate numbers of PMUs is critical to collect phase angle data for best identifying multiple line outages in wide-area transmission system, because of high deployment costs. This work focuses on exploring the global optimal strategy of PMU deployment for maximizing the average identification capability of multiple line outages. Inspired by Kullback-Leibler (KL) distance, this paper proposes the closed-form mathematical model to describe the average identification capability of multiple simultaneous line outages. Using IEEE 14-bus system, the optimal trade-off between the average identification capability and the number of PMUs is characterized. The proposed model successfully portrays the statistical identification performance of multiple line outages. The numerical result shows that the global optimal PMU placement algorithm has higher average identification capability when compared to the random PMU placement algorithm.

关键词： Phasor measurement units Smart grids Mathematical model Numerical models Vectors Optimization Conferences

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Robust Bayesian max-margin clustering 14

Robust Bayesian max-margin clustering

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Proceedings of the 28th International Conference on Neural Information Processing systems - Volume 1

作者： Changyou Chen Jun Zhu Xinhua Zhang Dept. of Electrical and Computer Engineering Duke University Durham NC State Key Lab of Intelligent Technology & Systems Tsinghua National TNList Lab and Dept. of Computer Science & Tech. Tsinghua University Beijing China Australian National University (ANU) and National ICT Australia (NICTA) Canberra Australia

We present max-margin Bayesian clustering (BMC), a general and robust framework that incorporates the max-margin criterion into Bayesian clustering models, as well as two concrete models of BMC to demonstrate its flexibility and effectiveness in dealing with different clustering tasks. The Dirichlet process max-margin Gaussian mixture is a nonparametric Bayesian clustering model that relaxes the underlying Gaussian assumption of Dirichlet process Gaussian mixtures by incorporating max-margin posterior constraints, and is able to infer the number of clusters from data. We further extend the ideas to present max-margin clustering topic model, which can learn the latent topic representation of each document while at the same time cluster documents in the max-margin fashion. Extensive experiments are performed on a number of real datasets, and the results indicate superior clustering performance of our methods compared to related baselines.

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Design and Integration of Interphase Inductors for Interleaved Three Phase Voltage-Source-Inverters in DC-fed Motor Drive systems

Design and Integration of Interphase Inductors for Interleav...

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International Power Electronics Conference

作者： Xuning Zhang Dushan Boroyevich Rolando Burgos Center for Power Electronics Systems (CPES) The Bradley Dept. of Electrical & Computer Engineering Virginia Tech

ISBN: (纸本)9781479927067

This paper presents a detail analysis on the design and integration of interphase inductor for interleaved three phase voltage-source-inverters (VSI). The benefits of interleaving on EMI filter weight reduction are presented. Interleaving can cancel certain order of harmonics in the total output current and reduce the size and weight of the EMI filter to meet certain EMI standard. However, it also creates the voltage difference between the two converters that generate circulating current in the system which increase system loss and device stress. In order to limit the circulating current, additional interphase inductors are needed for motor drive system. The penalty of the circulating current and additional interphase inductors are analyzed in detail. Design examples are given for EMI filter and interphase inductor design, which shows that interleaving will increase the total passive weight due to the additional weight of coupled inductors for motor drive systems. In order to reduce the total weight of the passive components of the system, integration design methods for interphase inductor is proposed which indicates that certain value of AC DM inductance can be integrated with interphase inductors with negligible increase on the weight and the maximum integrated inductance is related with interleaving angle. Verifications are carried out through both the simulations and experiments on a 2kW DC-fed motor drive system.

关键词： Interleaving Interphase inductor Motor drive Passive component weight reduction

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Direct digital control of an efficient silicon+liquid crystal phase shifter 11

Direct digital control of an efficient silicon+liquid crysta...

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11th International Conference on Group IV Photonics, GFP 2014

作者： Xing, Yufei Ako, Thomas George, John P. Korn, Dietmar Yu, Hui Verheyen, Peter Pantouvaki, Marianna Lepage, Guy Absil, Philippe Koos, Christian Leuthold, Juerg Beeckman, Jeroen Bogaerts, Wim Liquid Crystal and Photonics Group Ghent University Department of Electronics and Information Systems Gent Belgium Photonics Research Group Ghent University - Imec Department of Information Technology Gent Belgium Institutes IPQ and IMT Engesserstr. 5 Karlsruhe Germany IMEC Vzw Leuven Belgium Gent Belgium Zhejiang University Department of Information Science and Electronic Engineering Hangzhou China Dept. of Electrical and Computer Engineering National University of Singapore Singapore Singapore Zurich Switzerland Luceda Photonics Dendermonde Belgium

ISBN: (纸本)9781479922833

We demonstrate a phase shifter based on a silicon slot waveguide infiltrated with liquid crystal. We achieve a phase shift of 73 π for a 5V drive voltage, with a voltage-length product of 0.022V·mm around 1V. We can drive the phase shifter directly with a 1V, duobinary pulse-width-modulated signal, allowing direct digital CMOS control of an analog optical phase shifter.

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Event-Triggered Optimal Control of Nonlinear Continuous-time systems in Affine Form by using Neural Networks

Event-Triggered Optimal Control of Nonlinear Continuous-time...

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IEEE Annual Conference on Decision and Control

作者： Avimanyu Sahoo Hao Xu S. Jagannathan Travis Dierks Dept. of Electrical and Computer Engineering Missouri University of Science and Technology Rolla MO USA College of Science and Engineering Texas A&M - Corpus Christi Corpus Christi USA DRS Sustainment Systems Inc. St. Louis MO USA

ISBN: (纸本)9781467360890

The proposed event-triggered control design uses the adaptive dynamic programming (ADP) technique to solve the infinite-horizon optimal control of nonlinear continuous time system in affine form with complete unknown system dynamics in a forward time and online manner. The approximation property of the neural network (NN) is used to estimate the system dynamics and the value function with event-based sampling of state vector. Subsequently the estimated values are used to design the near optimal control policy. In addition, the NN weights are updated as a jump at every trigger instant, hence aperiodic in nature, to save computation when compared to the traditional NN-based approaches. Further, the closed-loop dynamics are formulated as a nonlinear impulsive dynamical system and the extension of the Lyapunov technique is utilized to prove the locally ultimate boundedness of all the closed-loop signals by deriving an adaptive event-trigger condition. Nonetheless, a positive lower bound on the inter-event time is guaranteed to avoid accumulation point. Finally, the analytical design is evaluated by using an example.

关键词： Neural network System dynamics Continuous time systems Event trigger Optimal control Affine In-law design control nonlinearity jump

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An improved optimization method based on the intelligent water drops algorithm for the vehicle routing problem

An improved optimization method based on the intelligent wat...

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IEEE Workshop on Computational Intelligence in Production and Logistics systems (CIPLS)

作者： Zahra Booyavi Ehsan Teymourian G.M. Komaki S. Sheikh Department of Industrial Engineering University of Science and Culture Tehran Iran Electrical Engineering and Computer Science Department Case Western Reserve University Cleveland USA Industrial Engineering Department Mazandaran University of Science and Technology Babol Iran Information Systems and Decision Science Dept. University of Baltimore Baltimore USA

We introduce an improved intelligent water drops (IIWD) algorithm as a new swarm-based nature inspired algorithm to solve capacitated vehicle routing problem. IIWD algorithm introduces new adjustments and features that help to optimize the VRP problem with higher efficiency. We reinforce this algorithm to have satisfactory consequences in controlling the balance between diversification and intensification of the search process. We solve 14 well-known benchmark instances in the literature to compare the solutions with the best reported solutions in the literature. Experimental results demonstrate that the suggested technique can well and effectively cope with such problems.

关键词： Soil Vehicles Heuristic algorithms Algorithm design and analysis Vehicle routing Optimization Approximation algorithms

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Solving extensive-form games with double-oracle methods 13

Solving extensive-form games with double-oracle methods

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12th International Conference on Autonomous Agents and Multiagent systems 2013, AAMAS 2013

作者： Bošanský, Branislav Agent Technology Center Dept. of Computer Science Faculty of Electrical Engineering Prague Czech Republic

ISBN: (纸本)9781627487665

We investigate iterative algorithms for computing exact Nash equilibria in two-player zero-sum extensive-form games. The algorithms use an algorithmic framework of double-oracle methods. The main idea is to restrict the game by allowing the players to play only some of the strategies, and then iteratively solve this restricted game and exploit fast best-response algorithms to add additional strategies to the restricted game for the next iteration. The experimental evaluation on different games shows that the double-oracle methods often provide significant improvement in running-time, and can find exact solution of much larger games compared to the existing approaches. Copyright © 2013, International Foundation for Autonomous Agents and Multiagent systems (***). All rights reserved.

关键词： Game theory

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Steelmaking plant technology for steelmaking operations

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Nippon Steel Technical Report 2013年第104期 74-82页

作者： Mimura, Yoshihito Kinoshita, Junichi Umetsu, Kenji Seki, Takeshi Shia, Yoshiaki Ishimori, Yuichi Ohshita, Isao Matsuishi, Nagayuki Higashi, Hirofumi Wakida, Shuji Plant Engineering Div. Plant Engineering and Facility Management Center 20-1 Shintomi Futtsu Chiba 293-8511 Japan Steelmaking Technology Dept. Plant Engineering Div. Plant Engineering and Facility Management Center Japan Electrical and Instrument Maintenance Technology Dept. Systems and Control Engineering Div. Plant Engineering and Facility Management Center Japan Continuous Casting Plant Engineering Dept. Plant Engineering Div. Plant Engineering and Facility Management Center Japan Mechanical Maintenance Technology Dept. Mechanical Engineering Div. Plant Engineering and Facility Management Center Japan Mechanical Technology Dept. Equipment Div. Japan System and Control Technology Dept. Systems and Control Engineering Div. Plant Engineering and Facility Management Center Japan Structural Engineering Dept. Civil Engineering Div. Plant Engineering and Facility Management Center Japan Engineering and Development Section Steel Plant Engineering Dept.-II Plant and Machinery Div. Japan

Steelmaking technology have been developed by some needs and environmental changes. Among them, in steelmaking plant, more technology have been preceded by production of high quality products, approach for global environmental affairs and application of information technology and computer technology. From these viewpoints, some aspects and results of recent steelmaking plant technology will be described in this paper.

关键词： Steelmaking

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Facilitating push-off propulsion: A biomechanical model of ankle robotics assistance for plantarflexion gait training in stroke

Facilitating push-off propulsion: A biomechanical model of a...

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IEEE/RAS-EMBS International Conference on Biomedical Robotics and Biomechatronics (BioRob)

作者： Anindo Roy Hermano I. Krebs Kamran Iqbal Nathan R. Macko Richard F. Macko Larry W. Forrester Dept. of Neurology VA RR&D Maryland Exercise and Robotics Center of Excellence (MERCE) Baltimore MD Dept. of Mechanical Engineering Massachusetts of Technology (MIT) Cambridge MA Dept. of Mechanical and Aerospace Engineering University of California at Irvine Irvine CA Dept. of Electrical and Computer Engineering University of Maryland College Park MD UMB-SOM Geriatric Research Education and Clinical Core Baltimore MD UMB-SOM VA RR&D MERCE Baltimore MD

Individuals with stroke often have diminished muscle strength that contributes to impaired push-off propulsion during walking, resulting in abnormal compensatory mechanisms and slower gait speeds. In this paper, we present a sagittal, 2-link biomechanical model of ankle push-off propulsion dynamics. The purpose of the model is to predict the parameters of an impedance controller to generate a desired level of anterior-posterior push-off during assisted walking with a modular ankle robot (“Anklebot”). In conjunction with our development of a novel gait event-triggered training approach, this model will facilitate tailoring the assisted push-off to individual severity. Here, we develop the model from first principles and experimentally validate it in a healthy subject.

关键词： Propulsion Legged locomotion Foot Training Biological system modeling Torque

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Dynamic reserve estimating method with consideration of uncertainties in supply and demand

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Transactions of the Korean Institute of electrical Engineers 2013年第11期62卷 1495-1504页

作者： Kwon, Kyung-Bin Park, Hyeon-Gon Lyu, Jae-Kun Kim, Yu-Chang Park, Jong-Keun Dept. of Electrical and Computer Engineering Seoul National University Korea Republic of Wind-Energy Grid Adaptive Technology Research Center Chonbuk National University Korea Republic of

Renewable energy integration and increased system complexities make system operator maintain supply and demand balance harder than before. To keep the grid frequency in a stable range, an appropriate spinning reserve margin should be procured with consideration of ever-changing system situation, such as demand, wind power output and generator failure. This paper propose a novel concept of dynamic reserve, which arrange different spinning reserve margin depending on time. To investigate the effectiveness of the proposed dynamic reserve, we developed a new short-term reliability criterion that estimates the probability of a spinning reserve shortage events, thus indicating grid frequency stability. Uncertainties of demand forecast error, wind generation forecast error and generator failure have been modeled in probabilistic terms, and the proposed spinning reserve has been applied to generation scheduling. This approach has been tested on the modified IEEE 118-bus system with a wind farm. The results show that the required spinning reserve margin changes depending on the system situation of demand, wind generation and generator failure. Moreover the proposed approach could be utilized even in case of system configuration change, such as wind generation extension.

关键词： Forecasting

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