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    Wyświetlanie 1-7 z 7
    Tytuł:
    Analysis of sectionalizing switch placement in medium voltage distribution networks in the aspect of improving the continuity of power supply
    Autorzy:
    Bąchorek, W.
    Benesz, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/201362.pdf
    Data publikacji:
    2020
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    reliability of distribution networks
    sectionalizing switches
    SAIDI
    Opis:
    The paper addresses the problem of placement of sectionalizing switches in medium voltage distribution networks. Proper placement of sectionalizing switches is one of the elements leading to higher power networks reliability. The methods of optimal allocation of such switches in a MV distribution network are presented in the paper. SAIDI was used as a criterion for the sectionalizing switches placement. For selecting optimum placements, three methods were used: brute force method, evolutionary algorithm and heuristic algorithm. The calculations were performed for a real MV network.
    Źródło:
    Bulletin of the Polish Academy of Sciences. Technical Sciences; 2020, 68, 3; 459-466
    0239-7528
    Pojawia się w:
    Bulletin of the Polish Academy of Sciences. Technical Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Reliable and High QoS Wireless Communications over Harsh Environments
    Autorzy:
    Bilbao, J.
    Calvo, A.
    Armendariz, I.
    Crespo, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/307844.pdf
    Data publikacji:
    2013
    Wydawca:
    Instytut Łączności - Państwowy Instytut Badawczy
    Tematy:
    cooperative wireless networks
    multicasting management techniques
    next generation networks
    opportunistic wireless
    quality and performance evaluation
    QoS
    reliability and performance modelling
    reliability of networks
    wireless and mobile networks
    Opis:
    One of the most challenging research fields in which research community has taken a very active role is focused on trying to bring the features of wireless networks into line with the traditional wired solutions. Given the noisy and lossy nature of the wireless medium, it is more difficult to provide a comparable Quality of Service (QoS) and Reliability over wireless networks. This lack of reliability avoids the use of wireless solution in scenarios under harsh environment and mission-critical applications. In this paper we propose an inter-node collaborative schema with the aim of improving the achievable QoS level for multicast streaming, through the use of Network Coding and the algebra it is based on. We also present an implementation of the described algorithm on the OPNET discrete event simulation tool. Experimental results highlighting the performance achieved by the proposed algorithm and its improved efficiency as compared to other solutions are described.
    Źródło:
    Journal of Telecommunications and Information Technology; 2013, 1; 32-40
    1509-4553
    1899-8852
    Pojawia się w:
    Journal of Telecommunications and Information Technology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Bayesian Algorithms for Calculating Symbolic Rates of the Unreliability and Reliability of the Electric Supply
    Bayesowskie algorytmy obliczeń symbolicznych wskaźników zawodności i niezawodności zasilania energią elektryczną
    Autorzy:
    Korniluk, W.
    Petelski, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/396936.pdf
    Data publikacji:
    2013
    Wydawca:
    ENERGA
    Tematy:
    Bayesian networks
    indicators of reliability
    calculation of symbolic
    sieci bayesowskie
    wskaźniki niezawodności
    obliczenia symboliczne
    Opis:
    The report presents the use of Bayesian networks in the calculation of symbolic indicators of reliability and unreliability of the electric power supplying load point. The calculation of indicators of reliability is determined by the analytical dependencies. These dependencies are used to estimate: probability of up or down state of power system components supplying the load point; total probability distribution; conditional probabilities of the state power or lack of power appearance; the intensity of current interruptions and the average time of their duration; contributions of individual power system components in the service reliability. This report describes how to obtain these analytical dependencies, using the ultimate application for symbolic computations Mathematica (ver. 8). In this paper we will discuss the results of the symbolic computations for selected supply power system and methods for reducing the duration of symbolic computations of indicators for multiple-compound electrical power systems.
    W referacie przedstawiono wykorzystanie sieci bayesowskich w obliczeniach symbolicznych wskaźników zawodności i niezawodności zasilania energią elektryczną węzłów odbiorczych. Podano, stosowane przy wyznaczaniu wskaźników niezawodności za pomocą sieci bayesowskich, analityczne zależności na wyznaczanie: prawdopodobieństw bezwarunkowych stanów zdatności i niezdatności elementów układu zasilania danego węzła, łącznego rozkładu tych prawdopodobieństw, prawdopodobieństw warunkowych wystąpienia stanu zasilania lub jego braku oraz intensywności występowania przerw w zasilaniu i średniego czasu ich trwania, a także ważności i wkładów poszczególnych elementów w niezawodność zasilania. Przedstawiono sposób uzyskania tych analitycznych zależności za pomocą wybranych instrukcji obliczeń symbolicznych programu Mathematica 8. Omówiono wyniki kontrolnych obliczeń symbolicznych dla wybranych układów zasilania. Zaproponowano sposoby ograniczenia czasu trwania obliczeń symbolicznych wskaźników niezawodności dla wieloelementowych złożonych układów zasilania energią elektryczną.
    Źródło:
    Acta Energetica; 2013, 4; 37-47
    2300-3022
    Pojawia się w:
    Acta Energetica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    A WSN architecture for building resilient, reactive and secure wireless sensing systems
    Autorzy:
    Gburzyński, Paweł
    Powiązania:
    https://bibliotekanauki.pl/articles/1954583.pdf
    Data publikacji:
    2021
    Wydawca:
    Politechnika Gdańska
    Tematy:
    wireless sensor networks
    mesh networks
    reliability
    security
    internet of things
    bezprzewodowe sieci czujnikowe
    sieci typu mesh
    niezawodność
    bezpieczeństwo
    internet rzeczy
    Opis:
    We introduce a wireless sensor network (WSN) architecture intended for massive deployments in custom applications where the primary goal is the collection of low-volume (e.g., telemetric) data possibly augmented with spontaneous special events, like alerts or alarms. The network is built of inexpensive, small-footprint, energy-frugal, possibly mobile nodes running reactive programs and self-organizing themselves into resilient distributed systems in a manner embracing the limited capabilities of the devices as well as the unreliable nature of ad-hoc wireless communication. We propose and elaborate on a holistic approach to constructing complete WSN applications. Our approach incorporates a certain unified programming and communication paradigm. In addition to producing small, energy-efficient, self-documenting and reliable programs for ultra-small-footprint motes, that paradigm enables authoritative virtual execution of complete application, thus facilitating their rapid development, testing, augmentation and modification.
    Źródło:
    TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk; 2021, 25, 2; 141-181
    1428-6394
    Pojawia się w:
    TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Reliability improvement of power distribution line exposed to extreme icing in Poland
    Autorzy:
    Ciesielka, W.
    Gołaś, A.
    Szopa, K.
    Bąchorek, W.
    Benesz, M.
    Kot, A.
    Moskwa, S.
    Zydroń, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/200660.pdf
    Data publikacji:
    2020
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    power distribution networks
    overhead lines
    finite element method
    reliability
    icing
    rime
    prevention of line icing
    Opis:
    Currently, overhead lines dominate in the Polish medium and low voltage distribution networks. Maintaining their high reliability constitutes a very important challenge, especially under the severely changing climate conditions. An overhead power line exposed to high ice and rime loads has been considered. Using the finite element method (FEM), mechanical reliability of the distribution infrastructure was examined under various atmospheric conditions. Loads under the stressful conditions of rime, ice and wind were determined for the weakest section of the 30 kV overhead line, which consisted of concrete poles and ACSR conductors. SAIDI and SAIFI reliability indices and costs were determined for several variants of object reconstruction. The results allowed for determination of a solution relying on relocating the cables of all lateral branches and main line ice protection, through a system based on a weather-coordinated increase of the electrical load. To verify the solution proposed, a field experiment was conducted. The experiment confirmed the effectiveness of the solution proposed that appears to be universal. The paper is a result of synergic cooperation of two academic teams, i.e. a mechanical and electrical power engineering one, and the Distribution System Operator (DSO).
    Źródło:
    Bulletin of the Polish Academy of Sciences. Technical Sciences; 2020, 68, 5; 1113-1125
    0239-7528
    Pojawia się w:
    Bulletin of the Polish Academy of Sciences. Technical Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Main aspects influencing the evaluation of atmospheric overvoltages in high-voltage networks
    Autorzy:
    Borecki, Michał
    Ciuba, Maciej
    Kharchenko, Yevhen
    Khanas, Yuriy
    Powiązania:
    https://bibliotekanauki.pl/articles/2173536.pdf
    Data publikacji:
    2021
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    overvoltage protection
    high voltage networks
    reliability of power grids
    risk analysis
    ochrona przed wysokim napięciem
    sieć wysokiego napięcia
    niezawodność sieci elektroenergetycznych
    ocena ryzyka
    Opis:
    The effectiveness of lightning protection on the power and distribution grid is a significant factor, which influences the power distribution reliability and the failure rate of system elements. As part of this article, a mathematical model will be presented, taking into account selected parameters that affect the assessment of the lightning hazard of an overhead line. The proposed model will consider the location of the object near the line and the adjustment of line conductor overhangs. Moreover, the mentioned mathematical model allows for analyzing the impact of considered parameters on the protection level of the power system, and transient overvoltages that occur in this system. The article contains also a detailed description of an effective and fast method to assess the lightning discharge impact on the power system with insufficient data. The introduced model was tested to verify the correctness of its operation by comparison of calculation results and functional data. High convergence of calculated and functional data and uncomplicated model structure ensure a wide range of applications for the proposed solution to easily prevent emergency situations in the power system. Furthermore, the described model gives the opportunity to assess the reduction of the range of selectivity zone associated with the power line, in conjunction with the impact of constructional peculiarities and a near object.
    Źródło:
    Bulletin of the Polish Academy of Sciences. Technical Sciences; 2021, 69, 1; art. no. e135838
    0239-7528
    Pojawia się w:
    Bulletin of the Polish Academy of Sciences. Technical Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Main aspects influencing the evaluation of atmospheric overvoltages in high-voltage networks
    Autorzy:
    Borecki, Michał
    Ciuba, Maciej
    Kharchenko, Yevhen
    Khanas, Yuriy
    Powiązania:
    https://bibliotekanauki.pl/articles/2090728.pdf
    Data publikacji:
    2021
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    overvoltage protection
    high voltage networks
    reliability of power grids
    risk analysis
    ochrona przed wysokim napięciem
    sieć wysokiego napięcia
    niezawodność sieci elektroenergetycznych
    ocena ryzyka
    Opis:
    The effectiveness of lightning protection on the power and distribution grid is a significant factor, which influences the power distribution reliability and the failure rate of system elements. As part of this article, a mathematical model will be presented, taking into account selected parameters that affect the assessment of the lightning hazard of an overhead line. The proposed model will consider the location of the object near the line and the adjustment of line conductor overhangs. Moreover, the mentioned mathematical model allows for analyzing the impact of considered parameters on the protection level of the power system, and transient overvoltages that occur in this system. The article contains also a detailed description of an effective and fast method to assess the lightning discharge impact on the power system with insufficient data. The introduced model was tested to verify the correctness of its operation by comparison of calculation results and functional data. High convergence of calculated and functional data and uncomplicated model structure ensure a wide range of applications for the proposed solution to easily prevent emergency situations in the power system. Furthermore, the described model gives the opportunity to assess the reduction of the range of selectivity zone associated with the power line, in conjunction with the impact of constructional peculiarities and a near object.
    Źródło:
    Bulletin of the Polish Academy of Sciences. Technical Sciences; 2021, 69, 1; e135838, 1--8
    0239-7528
    Pojawia się w:
    Bulletin of the Polish Academy of Sciences. Technical Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-7 z 7

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