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    Wyświetlanie 1-7 z 7
    Tytuł:
    The performance of passive methods of detecting island operation implemented in PV inverters during selected disturbances in distribution power grids
    Autorzy:
    Parol, M.
    Połecki, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/201420.pdf
    Data publikacji:
    2020
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    distribution power grids
    distributed generation
    island operation detecting
    passive methods
    PV inverters
    functional reliability
    Opis:
    Distributed generation is an issue intensively studied in recent years. It concerns, among others protection systems of distributed generation units connected to electric power grids. The main goal of this paper is to present the issue of functional reliability of selected passive loss of mains (LoM) protection systems, i.e. methods of detecting island operation in distribution power grids, which are implemented in PV inverters installed in sample MV and LV grids, typical for Polish conditions. First, different methods of detecting island operation have been distinguished and shortly characterized. Some problems concerning their action have also been presented. Then commonly used passive methods of island grid operation detection have been described. Next sample distribution grid has been presented and chosen disturbances modelled in the grid to test mentioned passive methods have been defined. For each of the determined type of disturbance the dynamic simulation has been carried out, as well as voltage and frequency plots for two selected RES nodes have been recorded and observed. All considered passive methods of island grid operation detection have been implemented in a Matlab/Simulink environment. Models of RoCoF, U/OVP and U/ OFP algorithms have been presented in diagrams. Then, results of carried out extensive studies have been shown in tables and discussed. The results are a consequence of a realized research project concerning electric grids in rural areas. Summary, final conclusions, and future research possibilities constitute the last part of the paper. The conclusions are mainly concentrated on evaluation of action of passive methods of island operation detection as well as possibility of using the methods in Polish conditions, particularly in rural distribution grids.
    Źródło:
    Bulletin of the Polish Academy of Sciences. Technical Sciences; 2020, 68, 5; 1087-1098
    0239-7528
    Pojawia się w:
    Bulletin of the Polish Academy of Sciences. Technical Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Voltage stability in low voltage microgrids in aspects of active and reactive power demand
    Autorzy:
    Parol, M.
    Rokicki, Ł.
    Powiązania:
    https://bibliotekanauki.pl/articles/140350.pdf
    Data publikacji:
    2016
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    distributed generation
    microgrids
    voltage stability
    voltage stability margin
    indexes
    Opis:
    Low voltage microgrids are autonomous subsystems, in which generation, storage and power and electrical energy consumption appear. In the paper the main attention has been paid to the voltage stability issue in low voltage microgrid for different variants of its operation. In the introduction a notion of microgrid has been presented, and also the issue of influence of active and reactive power balance on node voltage level has been described. Then description of voltage stability issue has been presented. The conditions of voltage stability and indicators used to determine voltage stability margin in the microgrid have been described. Description of the low voltage test microgrid, as well as research methodology along with definition of considered variants of its operation have been presented further. The results of exemplary calculations carried out for the daily changes in node load of the active and reactive power, i.e. the voltage and the voltage stability margin indexes in nodes have been presented. Furthermore, the changes of voltage stability margin indexes depending on the variant of the microgrid operation have been presented. Summary and formulation of conclusions related to the issue of voltage stability in microgrids have been included at the end of the paper.
    Źródło:
    Archives of Electrical Engineering; 2016, 65, 1; 19-32
    1427-4221
    2300-2506
    Pojawia się w:
    Archives of Electrical Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Towards optimal operation control in rural low voltage microgrids
    Autorzy:
    Parol, M.
    Rokicki, Ł.
    Parol, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/200413.pdf
    Data publikacji:
    2019
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    microgrids
    centralized control
    distributed control
    rural areas
    Opis:
    The paper raises the issue of controlling rural low voltage microgrids in an optimal manner. The impact of different criterion functions, related to the amount of energy exchanged with the distribution system operator network, the level of active power losses, the amount of energy generated by different energy sources and the value of financial performance measures regarding the microgrid operation, on the choice of operating points for devices suggested by the optimization algorithm has been analyzed. Both island and synchronous microgrid operation modes are being considered. We propose two variants of the optimization procedure: the first one is based on the particle swarm optimization algorithm and centralized control logic, and the second one takes advantage of the decentralized approach and Monte Carlo methods. A comparison of the simulation results for two sample rural microgrids, obtained for different objective functions, microgrid operation modes and optimization procedure variants, with the use of prepared algorithm implementations, has been provided. The results show that the proper choice of an objective function can have a crucial impact on the optimization algorithm’s behavior, the choice of operating points and, as a consequence, on microgrid behavior as well. The choice of the proper form of the objective function is the responsibility of the person in charge of both the microgrid itself and its operation. This paper can contribute towards making correct decisions in this area. Generally, slightly better results have been achieved for the centralized control mode of operation. Nevertheless, the results also suggest that in many cases the approach based on distributed logic can return results that are better or sufficiently close to the ones provided by the centralized and more sophisticated approach.
    Źródło:
    Bulletin of the Polish Academy of Sciences. Technical Sciences; 2019, 67, 4; 799-812
    0239-7528
    Pojawia się w:
    Bulletin of the Polish Academy of Sciences. Technical Sciences
    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:
    Pseudo-random bit generators based on linear-feedback shift registers in a programmable device
    Autorzy:
    Parol, M.
    Dąbal, P.
    Szplet, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/114462.pdf
    Data publikacji:
    2016
    Wydawca:
    Stowarzyszenie Inżynierów i Techników Mechaników Polskich
    Tematy:
    pseudo-random bit generators
    linear-feedback shift register
    programmable device
    Opis:
    We present the results of comparative study on three pseudo-random bit generators (PRBG) based on various use of linear-feedback shift registers (LFSR). The project was focused on implementation and tests of three such PRBG in programmable device Spartan 6, Xilinx. Tests of the designed PRBGs were performed with the use of standard statistical tests NIST SP800-22.
    Źródło:
    Measurement Automation Monitoring; 2016, 62, 6; 184-186
    2450-2855
    Pojawia się w:
    Measurement Automation Monitoring
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Effective approach to distributed optimal operation control in rural low voltage microgrids
    Autorzy:
    Parol, M.
    Kapler, P.
    Marzecki, J.
    Parol, R.
    Połecki, M.
    Rokicki, Ł.
    Powiązania:
    https://bibliotekanauki.pl/articles/201003.pdf
    Data publikacji:
    2020
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    microgrids
    optimal operation
    distributed control
    rural areas
    Opis:
    The paper raises the issue of optimizing the control of the rural low voltage microgrids. Microgrids can operate in a synchronous mode with grids of distribution system operators and in an island mode. We can distinguish two control strategies in microgrids: one approach based on centralized control logic, which is usually used, and another on decentralized control logic. In this paper we decided to present the approach based on the distributed control, combining the efforts of the distributed cooperative control and modified Monte Carlo optimization method. Special attention has been paid to the impact of the order of processing particular devices’ groups on results of optimization calculations. Moreover, different scenarios of behavior of the microgrid control system with respect to the communication loss have been also presented. The influence of the issue of continuity of communication between particular devices’ groups on the possibility of carrying out the optimization process has been investigated. Additionally, characteristics of power loads and generation of electricity from small renewable energy appearing in rural areas have been described and the sensitivity of the optimization algorithm to the changes of demanded power values and changes of values of power generated by renewable energy sources has been studied. We analyzed different objective functions which can be can be used as an optimization goal both in synchronous and island operation modes of microgrid. We decided to intensively test our approach on a sample rural LV microgrid, which is typical in the countryside. The observed results of the tests have been presented and analyzed in detail. Generally, results achieved with the use of proposed distributed control are the same as with the use of centralized control. We think that the approach based on distributed control is promising for practical applications, because of its advantages.
    Źródło:
    Bulletin of the Polish Academy of Sciences. Technical Sciences; 2020, 68, 4; 661-678
    0239-7528
    Pojawia się w:
    Bulletin of the Polish Academy of Sciences. Technical Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Wizualizacja danych z urządzeń TBA-IŁ
    Data visualization from TBA-IŁ series devices
    Autorzy:
    Godlewski, P.
    Parol, B.
    Pasternak, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/317476.pdf
    Data publikacji:
    2011
    Wydawca:
    Instytut Łączności - Państwowy Instytut Badawczy
    Tematy:
    bateria akumulatora
    niezawodność systemów telekomunikacyjnych
    badania jakości
    urządzenia kontrolno-pomiarowe
    storage battery
    telecommunication systems reliability
    quality inspection
    control-measuring instruments
    Opis:
    Przedstawiono strukturę oraz funkcje opracowanego w Instytucie Łączności oprogramowania, przeznaczonego do wizualizacji na ekranie komputera PC wyników badań baterii akumulatorów w obiektach telekomunikacyjnych. Oprogramowanie, przeznaczone do urządzeń TBA160-IŁ, umożliwia także obrazowanie danych archiwalnych uzyskanych z urządzeń TBA2-IŁ, TBA59-IŁ i TBA150-IŁ.
    The article describes software designed in National Institute of Telecommunication and his structure and functionality. Thes software was designed for data visualization on a PC computer. The data proceed from battery tests in telecommunication installations. The software, designed for TBA160-IŁ series, operate also with data from series: TBA2-IŁ, TBA59-IŁ and TBA150-IŁ.
    Źródło:
    Telekomunikacja i Techniki Informacyjne; 2011, 3-4; 52-61
    1640-1549
    1899-8933
    Pojawia się w:
    Telekomunikacja i Techniki Informacyjne
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-7 z 7

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