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International Crimean Conference on Microwave & Telecommunication Technology

作者： V.P. Dzyuba A.D. Dorichenko V.D. Yeryomka A.F. Zykov O.Ye. Malyovanyi L.P. Milinevskiy I.M. Mytsenko A.N. Piven' O.I. Prokopenko A.N. Roenko D.V. Roskoshnyi SE plant «Generator» 18 Novokonstantinovskaya Str.. Кyiv 04080 Ukraine SE «Kyiv state plant «Burevestnik» 2 Zdolbunivska Str. 02081 Ukraine O.Ya. Usykov Institute for Radiophysics and Electronics of NAS of Ukraine 12 Ac. Proskury Str. Kharkiv 61085 Ukraine The Department of Hybrid Modeling and Control Systems in Power Engineering of Pukhov Institute for Modeling in Energy Engineering NAS of Ukraine 15 Generala Naumova Str. Kyiv 03164 Ukraine Co Ltd. «Electrotekhnik- New Technology» 26/2 Melnitskaya Str. Odessa 65005 Ukraine Administration State Border Service of Ukraine 26 Volodymyrivska Str. Kyiv 01601 Ukraine Institute telecommunication system NTUU «KPI» 2 Industrial Lane Kyiv-56 03056 Ukraine

One of the problems in the area of radio wave propagation and radar design is creation of radar facilities for navigation in the regions of the World Ocean with intensive shipping. Ukrainian radio-electronic industry has a large experience in development of different purpose radar systems, one of that is the radar . This radar is used to control and observe marine surface situation on the naval border check-points of Ukraine. In the paper it is suggested to modernize radar for navigation and beyond-the-horizon detection of the surface objects. The possibilities of effective application for beyond-the-horizon detection of the surface objects in the districts of the World Ocean are estimated. To illustrate the latter the centimeter radio waves attenuation factor database, created in IRE NASU on the base of experimental results, is used. Statistical distribution functions of the radar coverage range in the districts of the World Ocean are determined. Comparison with experimental data for stationary navigation radars , and is conducted. Finally a conclusion, that radar can be used in the regions of the World Ocean for navigation and beyond-the-horizon detection of the surface objects, is made.

关键词： Radar Sea surface Radio navigation Surface waves Terrestrial atmosphere Generators

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Voltage quality improvement in islanded microgrids supplying nonlinear loads

Voltage quality improvement in islanded microgrids supplying...

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2012 3rd power Electronics, Drive systems and Technologies Conference, PEDSTC 2012

作者： Dehghani, Mohammad T. Vahedi, Abolfazl Savaghebi, Mehdi Guerrero, Josep M. Department of Power Engineering Saveh Branch Islamic Azad University Saveh Iran Center of Excellence for Power System Automation and Operation Iran University of Science and Technology Iran Department of Electronics Engineering Karaj Branch Islamic Azad University Karaj Iran Department of Automatic Control and Industrial Informatics Technical University of Catalonia Spain Institute of Energy Technology Aalborg University Denmark

ISBN: (纸本)9781467301114

The aim of this paper is to improve voltage quality at the terminals of distributed generators (DGs) in an islanded microgrid. To achieve this goal, it is proposed to include separate voltage and current control loops for the fundamental and harmonics frequencies. This way, it is not necessary to consider additional controllers to provide voltage harmonic compensation. The proposed control system can be implemented in a very simple way. The control structure of every single DG unit consists of active and reactive power droop controllers and voltage and current control loops. Simulation results are provided in order to show the effectiveness of the proposed control approach. © 2012 IEEE.

关键词： Harmonic analysis

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power system restoration planning and some key issues

Power system restoration planning and some key issues

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IEEE General Meeting power& Energy Society

作者： John N. Jiang Zuping Zhang Mingtian Fan Greg Harrison Chenxi Lin Maria Tamayo Varun Perumalla School of Electrical and Computer Engineering University of Oklahama USA Power System Research Department China Electric Power Research Institute China CEPRI Brazil Electric power engineering in the School of Electrical and Computer Engineering University of Oklahama USA Control system and power engineering University of Oklahama USA Alstom Grid USA

ISBN: (纸本)9781467327275

Improving the effectiveness of power system restoration planning becomes more important, since a higher NERC standard will be implemented in the near future. Standard EOP-005-2 concerns about the increased risk of large-scale system blackout due to the increased degree of uncertainty, as a very likely consequence of dynamic market activities, integration of large-scale less-dispatchable energy resources and other factors threatening the power system security. This paper presents a discussion of some of the important planning issues for power system restoration following a large-scale blackout. These issues were raised from several system restoration planning projects completed by the authors for several utility companies in Central United States and South China. Current practices at these companies are summarized. In addition, some bottleneck problems in effective restoration planning and possible solutions are suggested.

关键词： Planning Companies power system stability Generators Transient analysis Reliability

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Corrections to “Evaluations on AC Electrical Characteristics of No-Insulation Coil for power Devices” [Jun 13 4700604]

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IEEE Transactions on Applied Superconductivity 2013年第5期23卷

作者： Young Jin Hwang Seungyong Hahn Sukjin Choi Hyun Chul Jo Yoon Hyuck Choi Tae Jung Kim Tae Kuk Ko School of Electrical and Electronic Engineering Yonsei University Seoul Korea Francis Bitter Magnet Laboratory Massachusetts Institute of Technology Cambridge MA USA Department of Materials Science and Engineering Korea University Seoul Korea Department of Electrical Power System Measurement and Control Korea Foundation of Polytechnic Colleges Seoul Korea

In the above titled paper (ibid., vol. 23, no. 3, p. 4700604, Jun. 2013), there are errors within some of the texts and figures. The author has corrected these here.

关键词： Superconducting coils Fault currents High-temperature superconductors Insulation Loss measurement Superconducting magnets

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INFLUENCES OF BREAKDOWN CHARACTERISTICS OF DISCONNECT SWITCH GAP ON RESIDUAL VOLTAGE

INFLUENCES OF BREAKDOWN CHARACTERISTICS OF DISCONNECT SWITCH...

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The ⅪⅩ International Conference on Gas Discharges and Their Applications

作者： YUE GONGCHANG GUAN YONGGANG LIU WEIDONG CHEN WEIJIANG LI ZHIBING State Key Lab of Control and Simulation of Power System and Generation Equipments Department of Electrical EngineeringTsinghua University State Grid Corporation of China China Electric Power Research Institute

The very fast transient overvoltages(VFTO) are generated during operation of disconnect switch (DS) of gas insulated switchgear(GIS). After the opening operation of DS,the load side busbar is left at a residual *** residual voltage is determined by the opening phase and the breakdown characteristics of SF6 gap of DS. This study obtains the breakdown characteristic of the test DS,including the dielectric strength recovery speed and polarity effect factor of gap of testing *** the stochastic property of DS opening phase,the opening process of DS is simulated by computer under different dielectric strength recovery speeds and polarity effect *** results show that the dielectric strength recovery speed and polarity effect factor have big influences over the residual *** proper value of dielectric strength recovery speed and polarity effect factor could make the residual voltage minor

关键词： simulation INFLUENCES OF BREAKDOWN CHARACTERISTICS OF DISCONNECT SWITCH GAP ON RESIDUAL VOLTAGE

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Demand response participation in wholesale energy markets

Demand response participation in wholesale energy markets

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IEEE General Meeting power& Energy Society

作者： Masood Parvania Mahmud Fotuhi-Firuzabad Mohammad Shahidehpour Center of Excellence in Power System Control and Management Electrical Engineering Department Sharif University of Technology Tehran Iran ECE Department Illinois Institute of Technology Chicago USA

This paper summarizes a presentation to be given at the IEEE power and Energy Society 2012 General Meeting, in the panel session “Demand response: analytics, practice, and challenges in smart grid environment”. The paper elaborates participation of demand response (DR) resources in electricity markets. Specially, different types of DR participation in the wholesale energy markets are discussed. Then, two DR program designs are presented which aim to enable customers' participation in day-ahead energy markets. The paper continues with presenting the modified structure of the day-ahead energy market in presence of the DR programs. The offer packages specifically designed for DR participation in the market are introduced, and the market clearing problems including DR programs are presented and discussed. In the last section, the paper outlines different benefits of DR participation in energy markets.

关键词： Electricity ISO Educational institutions Load management Electricity supply industry Smart grids Electrical engineering

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An architecture description language based on dynamic description logics

An architecture description language based on dynamic descri...

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7th IFIP International Conference on Intelligent Information Processing, IIP 2012

作者： Wang, Zhuxiao Peng, Hui Guo, Jing Zhang, Ying Wu, Kehe Xu, Huan Wang, Xiaofeng School of Control and Computer Engineering State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources North China Electric Power University Beijing 102206 China Education Technology Center Beijing International Studies University Beijing 100024 China National Computer Network Emergency Response Technical Team/Coordination Center of China Beijing 100029 China Institute of Computing Technology Chinese Academy of Sciences Beijing 100190 China

ISBN: (纸本)9783642328909

ADML is an architectural description language based on Dynamic Description Logic for defining and simulating the behavior of system architecture. ADML is being developed as a new formal language and/or conceptual model for representing the architectures of concurrent and distributed systems, both hardware and software. ADML embraces dynamic change as a fundamental consideration, supports a broad class of adaptive changes at the architectural level, and offers a uniform way to represent and reason about both static and dynamic aspects of systems. Because the ADML is based on the Dynamic Description Logic DDL( (D)), which can represent both dynamic semantics and static semantics under a unified logical framework, architectural ontology entailment for the ADML languages can be reduced to knowledge base satisfiability in DDL( (D)), and dynamic description logic algorithms and implementations can be used to provide reasoning services for ADML. In this article, we present the syntax of ADML, explain its underlying semantics using the Dynamic Description Logic DDL( (D)), and describe the core architecture description features of ADML. © 2012 IFIP International Federation for Information Processing.

关键词： Formal languages

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Differential energy based microgrid protection against fault conditions

Differential energy based microgrid protection against fault...

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2012 IEEE PES Innovative Smart Grid Technologies, ISGT 2012

作者： Samantaray, S.R. Joos, Geza Kamwa, I. School of Electrical Sciences Indian Institute of Technology Bhubaneswar-751013 India Department of Electrical and Computer Engineering McGill University McConnell 633 3480 University Street Montreal QC H3A 2A7 Canada Hydro-Quebec/IREQ Power System Analysis Operation and Control Varennes QC J3X 1S1 Canada

ISBN: (纸本)9781457721588

A differential energy based fault protection in microgrid is presented in this paper. Initially the currents at the respective buses are retrieved and processed through a novel time-frequency transform known as S-transform to generate time-frequency contours. Spectral energy content of the time-frequency contours of fault current signals are calculated and differential energy is computed to register the fault patterns in the microgrid at grid-connected and islanded mode. The proposed scheme is tested for different shunt faults (symmetrical and unsymmetrical) and High Impedance Faults (HIF) in the microgrid with radial and loop structure. The results based on extensive study indicate that the differential energy based protection scheme can reliably protect the microgrid against different fault situations. © 2012 IEEE.

关键词： Mathematical transformations

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An architecture description language based on dynamic description logics for self-healing systems

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International Journal of Advancements in Computing Technology 2012年第18期4卷 89-96页

作者： Wang, Zhuxiao Peng, Hui Guo, Jing Wu, Kehe Cui, Wenchao Wang, Xiaofeng School of Control and Computer Engineering State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources North China Electric Power University Beijing 102206 China Education Technology Center Beijing International Studies University Beijing 100024 China National Computer Network Emergency Response Technical Team/Coordination Center of China Beijing 100029 China School of Control and Computer Engineering Institute of Electric Information Security Engineering Research Center of Power Information North China Electric Power University Beijing 102206 China Institute of Computing Technology Chinese Academy of Sciences Beijing 100190 China

As biological systems exhibit adaptation, healing and robustness in the face of changing environmental behavior, this paradigm has actuated research dealing with the concept of self-healing systems, which attempt to heal themselves in the sense of recovering from malicious attacks and rectifying of system faults. The goal of self-healing systems is to provide survivable systems that require high dependability, robustness, adaptability, and availability. Such systems maintain one or more models, whether external or internal, at run time as a basis for identifying problems and resolving them. This article describes an architectural description language, called ADML, which is being developed as a new formal language and/or conceptual model for representing evolving software architectures. The ADML embraces dynamic change as a fundamental consideration, supports a broad class of adaptive changes at the architectural level, and offers a uniform way to represent and reason about both static and dynamic aspects of self-healing systems. Because the ADML is based on the Dynamic Description Logic DDL(SHON (D)), which can represent both dynamic semantics and static semantics under a unified logical framework, architectural ontology entailment for the ADML languages can be reduced to knowledge base satisfiability in DDL(SHON (D)), and dynamic description logic algorithms and implementations can be used to provide reasoning services for ADML. In this article, we present the syntax of ADML, explain its underlying semantics using the Dynamic Description Logic DDL(SHON (D)), and exemplify our approach by applying it to the domain of load balancing a wireless remote-access system;the preliminary results certify the potential of the approach.

关键词： Formal languages

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Differential energy based microgrid protection against fault conditions

Differential energy based microgrid protection against fault...

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Innovative Smart Grid Technologies (ISGT)

作者： S.R. Samantaray Geza Joos I. Kamwa School of Electrical Sciences Indian Institute of Technology Bhubaneswar India Department of Electrical and Computer Engineering McGill University Montreal QUE Canada Hydro-Quebec/IREQ Power System Analysis Operation and Control Varennes QUE Canada

关键词： Time frequency analysis Fault currents Pattern recognition Impedance Wavelet transforms Mathematical model

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