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    Wyświetlanie 1-8 z 8
    Tytuł:
    Optimal load distribution estimation for fault location in electric power distribution systems
    Autorzy:
    Menchafou, Y.
    Zahri, M.
    Habibi, M.
    El Markhi, H.
    Powiązania:
    https://bibliotekanauki.pl/articles/140980.pdf
    Data publikacji:
    2017
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    electric power distribution systems
    fault location
    fictive load distribution
    load variation
    Opis:
    Accurate fault location in an electric power distribution system (EPDS) is important in maintaining system reliability. Diverse methods have been proposed in the past. These methods whither require measurements at each load point or use single-step loads compensation, which is hardly available in practical uses. In this paper, a simple technique to bypass the load problems is proposed. The method requires calculating an optimal load distribution using the total load seen from the substation (The rated power of distribution transformers) and the network topology. The optimal load distribution is used as a fictive distribution to replace the real unknown one in fault location (FL) algorithms. The effectiveness of the proposed technique is demonstrated using a mathematical formulation first, and next, by several simulations with a classic iterative fault location algorithm. The test results are obtained from the numerical simulation using the data of a distribution line recognized in the literature.
    Źródło:
    Archives of Electrical Engineering; 2017, 66, 1; 77-87
    1427-4221
    2300-2506
    Pojawia się w:
    Archives of Electrical Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Analysis of the electric power distribution systems on the rural areas of central Poland
    Analiza rozwoju elektroenergetycznych sieci rozdzielczych na terenach wiejskich Polski centralnej
    Autorzy:
    Trojanowska, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/93634.pdf
    Data publikacji:
    2014
    Wydawca:
    Polskie Towarzystwo Inżynierii Rolniczej
    Tematy:
    electric power distribution system
    quality
    electric power
    elektroenergetyczna sieć rozdzielcza
    jakość
    energia elektryczna
    Opis:
    Dynamics of the quantity and quality changes of the rural electric power distribution systems compared to the urban systems was analysed. It was found out that in 2006-2011 at the 18% growth of electric energy consumption by rural households approx. 0.5% development of the distribution systems, through which these households are supplied with electric power, was reported. Nonetheless, values of indicators which characterize the quality of supply of recipients have not deteriorated. The degree of use of the line capacity is still low. The issue, from the point of view of the electric power system capacity, are small fragments of overloaded distribution networks, improvement of which is first of all justified by the intensification of existing networks capacity, not by development.
    Przeanalizowano dynamikę zmian ilościowych i jakościowych wiejskich sieci elektroenergetycznych na tle sieci miejskich. Stwierdzono, że w latach 2006-2011 przy 18% wzroście zużycia energii elektrycznej przez gospodarstwa wiejskie nastąpił ok. 0,5% rozwój sieci, za pośrednictwem których gospodarstwa te zasilane są w energię elektryczną. Pomimo tego wartości wskaźników charakteryzujących jakość zasilania odbiorców nie uległy pogorszeniu. Stopień wykorzystania przepustowości linii jest w dalszym ciągu nieduży. Problemem z punktu widzenia przepustowości systemu elektroenergetycznego są niewielkie odcinki przeciążonych sieci rozdzielczych, których poprawę stanu upatruje się w pierwszej kolejności nie w rozwoju, a w intensyfikacji przepustowości sieci istniejących.
    Źródło:
    Agricultural Engineering; 2014, 18, 3; 213-218
    2083-1587
    Pojawia się w:
    Agricultural Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Optimization of urban MV multi-loop electric power distribution networks structure using Artificial Intelligence methods
    Autorzy:
    Parol, M.
    Baczyński, D.
    Brożek, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/205678.pdf
    Data publikacji:
    2012
    Wydawca:
    Polska Akademia Nauk. Instytut Badań Systemowych PAN
    Tematy:
    electric power distribution networks
    optimization of network structure
    evolutionary algorithms
    artificial neural networks
    Opis:
    Urban medium voltage (MV) electric power distribution networks are supplied with primary (HV/MV) substations. These networks supply secondary (MV/LV) transformer substations and are often built as closed structures - loop arrangements. The design problem of optimal urban MV distribution network structure consists of determining the number of primary substations, establishing the number of MV loops supplied with the primary substations, and assigning the secondary MV/LV transformer substations to the MV loops. The optimization task becomes especially complex when the number of the primary substations is greater than one. The minimum of total annual costs is sought. The total annual costs include: fixed (investment) costs, variable (operating) costs and supply-interruption costs. Typical constraints are also accounted for. The so defined optimization problem is a complicated mathematical problem in respect of computational effort. In order to resolve the mathematical model of the optimization problem, evolutionary algorithms and artificial neural networks have been used. Exemplary computational experiments have been executed on the model of urban MV multi-loop electric power distribution networks. The results from the evolutionary algorithm and the artificial neural network calculations have been compared.
    Źródło:
    Control and Cybernetics; 2012, 41, 3; 667-689
    0324-8569
    Pojawia się w:
    Control and Cybernetics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Future is T-Smart
    Autorzy:
    Ottone, Carlo
    Pagliacci, Mario G. R.
    Capoccia, Giorgio
    Tirinzi, Stefano
    Powiązania:
    https://bibliotekanauki.pl/articles/588414.pdf
    Data publikacji:
    2013
    Wydawca:
    Uniwersytet Ekonomiczny w Katowicach
    Tematy:
    Dystrybucja energii elektrycznej
    Miasto
    Ochrona środowiska
    Technologie informacyjne i telekomunikacyjne
    City
    Electric power distribution
    Environmental protection
    Information and Communication Technology (ICT)
    Opis:
    The English word "smart" evokes a lot of stimulating and positive meanings concerning brains. This word is utilised for identifying advanced and innovative high-tech projects, where Information Communication Technologies (ICT) play the core role. The project named Terni Smart-City Project (T-SMART) wants to get the town of Terni as a experimental laboratory for new technologies in production and distribution of energy, in alternative mobility, in services for consumers and citizens. It is an innovative and global planning asking the convinced and active participation of all the members of Society.
    Źródło:
    Studia Ekonomiczne; 2013, 149; 32-42
    2083-8611
    Pojawia się w:
    Studia Ekonomiczne
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Analysis of the effect of characteristic parameters of a distribution transformer on economic management of electric power transmission in low-voltage networks
    Autorzy:
    Nawrowski, R.
    Stein, Z.
    Zielińska, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/97588.pdf
    Data publikacji:
    2012
    Wydawca:
    Politechnika Poznańska. Wydawnictwo Politechniki Poznańskiej
    Tematy:
    electric power transmission
    distribution transformer
    electrical energy
    Opis:
    The paper presents an attempt of mathematical description of the effect of, among others, such parameters of modern energetic transformers as magnetizing current or power loss in the core on the power loss and reactive power, in case of power transmission in the distribution networks, particularly of low-voltage.
    Źródło:
    Computer Applications in Electrical Engineering; 2012, 10; 299-307
    1508-4248
    Pojawia się w:
    Computer Applications in Electrical Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Energy management strategy of dual planetary hybrid electric vehicle based on optimal transmission efficiency
    Autorzy:
    Wang, Shangxu
    Li, Jiaxin
    Shi, Dehua
    Sun, Xiaoqiang
    Yao, Yong
    Powiązania:
    https://bibliotekanauki.pl/articles/279483.pdf
    Data publikacji:
    2019
    Wydawca:
    Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
    Tematy:
    power split hybrid electric vehicle
    mechanical point
    fuzzy torque distribution
    fuel economy
    Opis:
    A power split hybrid electric vehicle with dual planetary gear sets is studied in this paper. Firstly, the power split and circulation phenomenon are further described by analyzing a speed and torque relationship between the engine, motors and the output shaft based on the lever analogy. The transmission efficiency and the electric power ratio are then obtained. The working modes of the hybrid electric vehicle (HEV) are divided according to the system operation mechanism. On this basis, the engine optimal operating line (OOL) control strategy and the mechanical point (MP) control strategy are designed. Furthermore, a fuzzy controller is designed to realize the optimal torque distribution of the engine and the motors in the MP control strategy. Simulation results demonstrate that the MP control strategy can guarantee a higher efficiency of the transmission system, which also shows good performance in improving fuel economy of the HEV by adjusting the engine operating point.
    Źródło:
    Journal of Theoretical and Applied Mechanics; 2019, 57, 2; 383-396
    1429-2955
    Pojawia się w:
    Journal of Theoretical and Applied Mechanics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Comparison of various control techniques for motor-pump sets applied in selected water distribution systems
    Autorzy:
    Popenda, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/1372738.pdf
    Data publikacji:
    2011
    Wydawca:
    Sieć Badawcza Łukasiewicz - Instytut Napędów i Maszyn Elektrycznych Komel
    Tematy:
    elektrociepłownia
    system dystrybucji wody
    pompa
    thermal-electric power station
    water distribution system
    pump
    Opis:
    The water distribution system applied in the thermal-electric power station EC Tychy SA is analyzed. The economical aspects of various control techniques for motor-pump sets in the aforementioned system are presented in the paper on the example of pumps working out of the cold season. The reasons of control losses occurring in the present system are depicted. The way of improvement of control effectiveness is proposed but unprofitability of the investment is also shown. A control of pumps by throttling and control by rotational speed changes are compared in the paper. It is shown that control by rotational speed changes causes similar losses like control by throttling if application of variable-speed technique is not preceded by appropriate adaptation of water distribution system, especially by adjustment of pump rated parameters.
    Źródło:
    Maszyny Elektryczne: zeszyty problemowe; 2011, 4, 92; 97-101
    0239-3646
    2084-5618
    Pojawia się w:
    Maszyny Elektryczne: zeszyty problemowe
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Analysis of the effectiveness of lightning and surge protection in a large solar farm
    Autorzy:
    Sobolewski, Konrad
    Sobieska, Emilia
    Powiązania:
    https://bibliotekanauki.pl/articles/2086693.pdf
    Data publikacji:
    2022
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    ANSYS simulations
    electric safety
    grounding system
    magnetic field distribution
    lightning modeling
    lightning protection
    photovoltaic power plant
    Opis:
    The aim of the considerations presented in the article was a stand-alone groundbased photovoltaic power plant. The article is devoted to the qualitative analysis of some lightning protection configurations. These types of constructions often require an individual look at the design and execution of lightning protection installations, which causes problems with the selection of optimal solutions. These problems relate primarily to the way the lightning rods are arranged to create protection zones, but also to the way they are attached: to the supporting structure for PV modules or as free-standing. Another problem raised in the article is the way how lightning current is discharged from rods to the ground and how it is dispersed there. Due to the vast area of such facilities and the requirements for electrical safety, it is necessary to consider and design a ground system with optimal electrical parameters, but also technical and economic ones. All these elements have their impact on the value of voltages induced in the electrical installation, which is also presented in the content of the article as the magnetic field distribution and calculation of induced voltages in an exemplary configuration. Finally, this article will compare described technical solutions encountered in selecting the best protection method for this type of photovoltaic installation.
    Źródło:
    Archives of Electrical Engineering; 2022, 71, 2; 523--542
    1427-4221
    2300-2506
    Pojawia się w:
    Archives of Electrical Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-8 z 8

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