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Wyszukujesz frazę "wide area" wg kryterium: Temat


Wyświetlanie 1-9 z 9
Tytuł:
Practical issues in frequency disturbance recorder design for wide-area monitoring
Autorzy:
Xu, Ch.
Zhong, Z.
Centeno, V.
Conners, R.
Liu, Y.
Powiązania:
https://bibliotekanauki.pl/articles/262637.pdf
Data publikacji:
2005
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie
Tematy:
power system
wide-area monitoring
phasor analysis
frequency tracking
Opis:
To maintain power system operation in a balanced and stable condition, the frequency deviation and the rate of frequency change information are highly desired in monitoring and protection applications of the power grid. How to obtain frequency information more accurately and efficiently has been the topic discussion for decades. PMUs (Phaser Measurement Unit) are the most widely-used devices for measuring phase angle differences and they also provide very accurate frequency information. However, the high installation cost of PMUs limits their applications for wide area control and stability analysis of power system. Thanks to commercial GPS receivers and the fast developments in Ethernet networks, an affordable wide area, quasi real-time, GPS synchronized frequency measurement is now possible. This paper introduces a portable networked Frequency Disturbance Recorder (FDR) device, which can be used at any 110V wall outlet and transmit measured frequency data remotely via the Ethernet. The practical issues and challenges of the device design and implementation are analyzed and discussed. Based on these low cost FDRs, a US-wide Frequency Network (FNET) has been implemented at Virginia Tech and some power system monitoring applications are being developed by taking fully advantage of the FDRs.
Źródło:
Electrical Power Quality and Utilisation. Journal; 2005, 11, 1; 69-76
1896-4672
Pojawia się w:
Electrical Power Quality and Utilisation. Journal
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Wide-area based on coordinated tuning of fuzzy PSS and FACTS controller in multi-machine environment
Autorzy:
Ebrahimian, H.
Sheikhahmad, E. F.
Powiązania:
https://bibliotekanauki.pl/articles/102172.pdf
Data publikacji:
2016
Wydawca:
Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:
wide area power system
FPSS
FACTS
improved honey bee mating optimization
Opis:
In this paper coordination of fuzzy power system stabilizer (FPSS) and flexible ac transmission systems (FACTS) have been considered in a multi-machine power system. The proposed model, has been applied for a wide-area power system. The proposed FPSS presented with local, nonlinear feedbacks, and the corresponding control synthesis conditions are given in terms of solutions to a set of linear matrix inequalities (LMIs). For this model, in fuzzy control synthesis, the new proposed control design method is based on fewer fuzzy rules and less computational burden. Also, the parameters of FACTS controller have been evaluated by improved honey bee mating optimization (IHBMO). The effectiveness of the proposed method has been applied over two case studies of single-machine infinite-bus (SMIB) and two areas four machine (TAFM) Kundur’s power system. The obtained results demonstrate the superiority of proposed strategy.
Źródło:
Advances in Science and Technology. Research Journal; 2016, 10, 29; 85-96
2299-8624
Pojawia się w:
Advances in Science and Technology. Research Journal
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Resource and Task Allocation Algorithm for WAN-based Distributed Computing Environment
Autorzy:
Markowski, M.
Powiązania:
https://bibliotekanauki.pl/articles/226934.pdf
Data publikacji:
2010
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
capacity and flow assignment problem
distributed computing
resource management
wide area networks
Opis:
In the paper an approximate algorithm for optimizing of distributed computing WAN network is proposed. Distributed computing systems become the common tools in different kind of business, science and even entertainment. In order to minimize processing time of data and utilize spare resources available on remote systems, many companies and institutions decide to build and maintain own wide area networks (WAN) for ensuring reliable and secure distributed processing of data. Design of WANs in concerned with solving different optimization problems, like routing assignment, capacities of channel selection, resource (i.e. servers, management centre) allocation. Due to peculiar structure of wide area networks and nature of protocols, proper optimization methods and algorithms should be constructed for WAN-based distributed computing systems. In the paper the model of the distributed environment, built on WAN infrastructure is presented. Then, the optimization problem for routing assignment, channel capacities assignment and grid management center (data repository) allocation is formulated. Finally, an approximate algorithm is presented for formulated problem. Proposed algorithm, observations and conclusions should effect in improving of distributed computing systems design.
Źródło:
International Journal of Electronics and Telecommunications; 2010, 56, 2; 197-202
2300-1933
Pojawia się w:
International Journal of Electronics and Telecommunications
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Flexible Software Design for Korean WA-DGNSS Reference Station
Autorzy:
Choi, W.S.
Chhattan, S.S.
Kye, J.E.
Han, W.Y.
Yun, H.
Kee, C.
Powiązania:
https://bibliotekanauki.pl/articles/116770.pdf
Data publikacji:
2013
Wydawca:
Uniwersytet Morski w Gdyni. Wydział Nawigacyjny
Tematy:
Global Navigation Satellite System (GNSS)
Flexible Software Design
Wide area Reference Station (WRS)
Opis:
In this paper, we describe the software design results of WA‐DGNSS reference station that will be constructed in Korea in the near future. Software design of the WRS (Wide area Reference Station) is carried out by applying object oriented software methodology in order to provide flexibilities: easy of model change (namely ionospheric delay model etc) and system addition (Galileo, GLONASS in addition to GPS etc). Software design results include the use case diagrams for the functions to be executed, the architecture diagram showing components and their relationships, the activity diagrams of behaviors and models among them, and class diagrams describing the attribute and operation.
Źródło:
TransNav : International Journal on Marine Navigation and Safety of Sea Transportation; 2013, 7, 1; 75-78
2083-6473
2083-6481
Pojawia się w:
TransNav : International Journal on Marine Navigation and Safety of Sea Transportation
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Optimal robust stabilizer design based on UPFC for interconnected power systems considering time delay
Autorzy:
Koofigar, H. R.
Isazadeh, G.
Powiązania:
https://bibliotekanauki.pl/articles/140441.pdf
Data publikacji:
2017
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
UPFC
mixed H2 /H∞
LMI
wide area
power system oscillations
time delay
Opis:
A robust auxiliary wide area damping controller is proposed for a unified power flow controller (UPFC). The mixed H2 /H∞ problem with regional pole placement, resolved by linear matrix inequality (LMI), is applied for controller design. Based on modal analysis, the optimal wide area input signals for the controller are selected. The time delay of input signals, due to electrical distance from the UPFC location is taken into account in the design procedure. The proposed controller is applied to a multimachine interconnected power system from the IRAN power grid. It is shown that the both transient and dynamic stability are significantly improved despite different disturbances and loading conditions.
Źródło:
Archives of Electrical Engineering; 2017, 66, 3; 459-474
1427-4221
2300-2506
Pojawia się w:
Archives of Electrical Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Metody badania wybranych usług dodanych w sieciach rozległych
Test methods for selected value-added services in wide area networks
Autorzy:
Czech, S.
Powiązania:
https://bibliotekanauki.pl/articles/305939.pdf
Data publikacji:
2010
Wydawca:
Wojskowa Akademia Techniczna im. Jarosława Dąbrowskiego
Tematy:
usługi dodane
sieci rozległe
sieci CDN
systemy PBM
value added services
wide area networks
CDN
PBM
Opis:
W publikacji przedstawiono wybrane usługi dodane wykorzystywane w sieciach rozległych, a także scharakteryzowano podstawowe typy architektur sieci, w których posiadają one zastosowanie. Omówiono również metody formalnego opisu wybranych usług dodanych na potrzeby ich badania oraz oceny jakości, a także zaprezentowano przykładowe wskaźniki liczbowe możliwe do wykorzystania dla systemów dostarczania treści. Zwrócono uwagę na techniki klasyfikacji ruchu w sieci wykorzystywane na etapie badania wybranych usług dodanych.
In this paper selected value-added services used in wide area networks are characterized, as well as there are also discussed methods for formal description of the selected value-added services to their testing and quality evaluation. Additionally there are presented examples of numerical indicators for content delivery systems and techniques of network traffic classification, which might be used at the stage of testing selected value-added services.
Źródło:
Biuletyn Instytutu Systemów Informatycznych; 2010, 5; 23-30
1508-4183
Pojawia się w:
Biuletyn Instytutu Systemów Informatycznych
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Low Frequency Electromagnetic Interferences Impact on Transport Security Systems Used in Wide Transport Areas
Autorzy:
Dziula, P.
Pas, J.
Powiązania:
https://bibliotekanauki.pl/articles/116657.pdf
Data publikacji:
2018
Wydawca:
Uniwersytet Morski w Gdyni. Wydział Nawigacyjny
Tematy:
transport security system
low frequency
wide transport area
electromagnetic Interferences
durability
vulnerability
transport telematics
diagnostics of interferences source
Opis:
The article presents the impact of electromagnetic interferences of low frequency range, on transport security systems used in wide transport areas. Intended and unintended (stationary and mobile), electromagnetic interferences, impacting on items and components constituting transport system at wide area (seaport, railway, etc.), cause changes of its vulnerability, resistance and durability. Diagnostics of interferences sources (amplitude, frequency range, radiation characteristics, etc.), appearing within transport environment, and usage of appropriate technical solutions of systems (i.e. shielding, reliability structures), allows for safe implementation of safety surveillance of human beings, properties and communication means.
Źródło:
TransNav : International Journal on Marine Navigation and Safety of Sea Transportation; 2018, 12, 2; 251-258
2083-6473
2083-6481
Pojawia się w:
TransNav : International Journal on Marine Navigation and Safety of Sea Transportation
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Evolutionary paths in wireless communication systems
Autorzy:
Michalski, W.
Powiązania:
https://bibliotekanauki.pl/articles/309042.pdf
Data publikacji:
2005
Wydawca:
Instytut Łączności - Państwowy Instytut Badawczy
Tematy:
cellular mobile radio systems
wireless local area networks
wireless personal networks
wide area wireless packet data systems
satellite-based mobile systems
paging/messaging systems
cordless telephones
access points
switches
GPRS
Mobile IP
WLAN cellular integration
Opis:
The paper contains a review and analysis of evolutionary paths of seven most important, from network development strategy point of view, wireless communication systems, especially the WLAN operating according to the IEEE 802.11 standard. With respect to WLAN, trends related to evolution toward mobile network and self organizing network as well as toward integration of WLAN and GSM using GPRS are presented. Concerning WLAN architecture development, evolution paths toward distributed controlled network as well as centrally coordinated and controlled network are described. Moreover, analysis includes cellular mobile radio systems, wireless personal networks, wide area wireless packet data systems, satellite-based mobile systems, paging/messaging systems and cordless telephones. With respect to these systems, general evolution process and trends associated with this process are described.
Źródło:
Journal of Telecommunications and Information Technology; 2005, 3; 105-111
1509-4553
1899-8852
Pojawia się w:
Journal of Telecommunications and Information Technology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Transparency of web portals of rural gminas in Łódź metropolitan area
Autorzy:
Feltynowski, M.
Powiązania:
https://bibliotekanauki.pl/articles/61598.pdf
Data publikacji:
2009
Wydawca:
Polska Akademia Nauk. Stowarzyszenie Infrastruktura i Ekologia Terenów Wiejskich PAN
Tematy:
World Wide Web portal
Web zob.World Wide Web
transparency
rural area
Lodz city
urban area
World Wide Web
information technology
communication technology
information society
socioeconomic development
Opis:
In the present world information and knowledge are important elements of the local course of every stage of the civil service. Information delivered to local community contributes to achieving a high local identity level. Development of information function in gminas is being extorted by permanent progress in the scope of the information and communication technologies (ICT). In local society, the most important way of holding information should be Internet. It is important because more and more households in rural area have opportunities to the access to the Internet. Local society can use websites erected by local governments to disseminate information about functioning and action picked up in administrative districts to local actors. Transparent websites are becoming a source of information as well as they let achieve the competitive edge above other gminas. An attempt of assessment of providing information by authorities and usefulness of this information from a socio-economic development point of view is the purpose of the paper. Building transparent and available websites for local society is the important task for local governments, because well-informed society participates in local life and in local undertaking picked up by authorities. This is important, especially in the rural gminas located in metropolitan areas which must achieve the competitive edge above other gminas. The paper shows that that the information constituting the indispensable element of social and economic processes becomes more and more universal and serves publicizing and nationalizing decision-making processes.
Źródło:
Infrastruktura i Ekologia Terenów Wiejskich; 2009, 07
1732-5587
Pojawia się w:
Infrastruktura i Ekologia Terenów Wiejskich
Dostawca treści:
Biblioteka Nauki
Artykuł
    Wyświetlanie 1-9 z 9

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