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    Wyświetlanie 1-9 z 9
    Tytuł:
    An advanced IoT system for monitoring and analysing chosen power quality parameters in micro-grid solution
    Autorzy:
    Khoa, Ngo Minh
    Dai, Le Van
    Tung, Doan Duc
    Toan, Nguyen An
    Powiązania:
    https://bibliotekanauki.pl/articles/1841334.pdf
    Data publikacji:
    2021
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    energy management
    internet of things (IoT)
    micro-grid
    power quality (PQ)
    ThingSpeak cloud
    Opis:
    This paper proposes an advanced Internet of Things (IoT) system for measuring, monitoring, and recording some power quality (PQ) parameters. The proposed systemis designed and developed for both hardware and software. For the hardware unit, three PZEM-004T modules with non-invasive current transformer (CT) sensors are used tomeasure the PQ parameters and an Arduino WeMos D1 R1 ESP8266 microcontroller isused to receive data from the sensors and send this data to the server via the internet. For the software unit, an algorithm using Matlab software is developed to send measurement datato the ThingSpeak cloud. The proposed system can monitor and analyse the PQ parameters including frequency, root mean square (RMS) voltage, RMS current, active power, and the power factor of a low-voltage load in real-time. These PQ parameters can be stored on theThingSpeak cloud during the monitoring period; hence the standard deviation in statistics of the voltage and frequency is applied to analyse and evaluate PQ at the monitoring point.The experimental tests are carried out on low-voltage networks 380/220 V. The obtained results show that the proposed system can be usefully applied for monitoring and analysing chosen PQ parameters in micro-grid solutions.
    Źródło:
    Archives of Electrical Engineering; 2021, 70, 1; 173-188
    1427-4221
    2300-2506
    Pojawia się w:
    Archives of Electrical Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    A Small Wind Turbine Output Model for Spatially Constrained Remote Island Micro-Grids
    Autorzy:
    Žigman, D.
    Meštrović, K.
    Tomiša, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/2172468.pdf
    Data publikacji:
    2022
    Wydawca:
    Uniwersytet Morski w Gdyni. Wydział Nawigacyjny
    Tematy:
    wind turbine
    small wind turbine
    decision tree model
    artificial neural network model
    random forest model
    micro-grids
    spatially constrained remote Island micro-grids
    remote Island micro-grid
    Opis:
    Modelling operation of the power supply system for remote island communities is essential for its operation, as well as a survival of a modern society settled in challenging conditions. Micro-grid emerges as a proper solution for a sustainable development of a spatially constrained remote island community, while at the same time reflecting the power requirements of similar maritime subjects, such as large vessels and fleets. Here we present research results in predictive modelling the output of a small wind turbine, as a component of a remote island micro-grid. Based on a month-long experimental data and the machine learning-based predictive model development approach, three candidate models of a small wind turbine output were developed, and assessed on their performance based on an independent set of experimental data. The Random Forest Model out performed competitors (Decision Tree Model and Artificial Neural Network Model), emerging as a candidate methodology for the all-year predictive model development, as a later component of the over-all remote island micro-grid model.
    Źródło:
    TransNav : International Journal on Marine Navigation and Safety of Sea Transportation; 2022, 16, 1; 143--146
    2083-6473
    2083-6481
    Pojawia się w:
    TransNav : International Journal on Marine Navigation and Safety of Sea Transportation
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Multi-sourced power system restoration strategy based on modified Prim’s algorithm
    Autorzy:
    Łukaszewski, Artur
    Nogal, Łukasz
    Powiązania:
    https://bibliotekanauki.pl/articles/2086893.pdf
    Data publikacji:
    2021
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    self-healing grid
    micro-grid
    reconfiguration
    greedy algorithms
    graph theory
    simulations
    Prim’s algorithm
    siatka samoleczenia
    mikrosiatka
    rekonfiguracja
    algorytmy zachłanne
    teoria grafów
    symulacje
    algorytm Prima
    Opis:
    Self-healing grids are one of the most developing concepts applied in electrical engineering. Each restoration strategy requires advanced algorithms responsible for the creation of local power systems. Multi-agent automation solutions dedicated for smart grids are mostly based on Prim’s algorithm. Graph theory in that field also leaves many problems unsolved. This paper is focused on a variation of Prim’s algorithm utility for a multi-sourced power system topology. The logic described in the paper is a novel concept combined with a proposal of a multi-parametrized weight calculation formula representing transmission features of energy delivered to loads present in a considered grid. The weight is expressed as the combination of three elements: real power, reactive power, and real power losses. The proposal of a novel algorithm was verified in a simulation model of a power system. The new restoration logic was compared with the proposal of the strategy presented in other recently published articles. The novel concept of restoration strategy dedicated to multi-sourced power systems was verified positively by simulations. The proposed solution proved its usefulness and applicability.
    Źródło:
    Bulletin of the Polish Academy of Sciences. Technical Sciences; 2021, 69, 5; e137942, 1--12
    0239-7528
    Pojawia się w:
    Bulletin of the Polish Academy of Sciences. Technical Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Research Concerning Electro magnetic Emissions from Residential On-grid PV Systems
    Autorzy:
    Maniak, Krzysztof
    Sobolewski, Janusz
    Tomczyk, Tomasz
    Spalt, Karolina
    Wroński, Jacek
    Powiązania:
    https://bibliotekanauki.pl/articles/2058497.pdf
    Data publikacji:
    2021
    Wydawca:
    Instytut Łączności - Państwowy Instytut Badawczy
    Tematy:
    EMC
    home-installed micro PV systems
    photovoltaic power conversion
    power grid quality
    radiated emissions
    Opis:
    The paper presents the results of grid power quality tests and wide frequency electromagnetic radiation level tests to which home power networks with photovoltaic systems have been subjected. The said results are meaningful from the point of view of safety and compatibility of electrical devices and the power supply system they are connected to. The tests covered stability of phase voltage and its frequency, harmonic level flicker, as well as RF radiated and emission levels. The measurements performed provide an answer to the question concerning the level of compliance of randomly selected home-installed PV systems with applicable recommendations and regulations concerning electromagnetic compatibility. The ability to meet the applicable standards translates into the health and safety of building inhabitants, which is the ultimate goal. Legal regulations concerning electromagnetic compatibility of renewable energy sources are consistent throughout the entire European Union.
    Źródło:
    Journal of Telecommunications and Information Technology; 2021, 4; 23--31
    1509-4553
    1899-8852
    Pojawia się w:
    Journal of Telecommunications and Information Technology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Studium nad łączeniem mikro kanalikowych wymienników ciepła w wymiennik integralny
    Studies on the Micro Heat Exchangers Coupling into Integral Heat Exchanger
    Autorzy:
    Kaczmarczyk, O.
    Mikielewicz, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/1818558.pdf
    Data publikacji:
    2015
    Wydawca:
    Politechnika Koszalińska. Wydawnictwo Uczelniane
    Tematy:
    mikro kanalikowy wymiennik ciepła
    sieć wymienników
    ORC
    micro channel heat exchanger
    heat exchangers grid
    Opis:
    As it is commonly known, heat exchangers are widely used in power generators equipment. The biggest disadvantage of conventional heat exchangers is that, in case of the energy load variation, it must be replaced by the one of different size. The aim of this work is to specify a method of combining micro channel heat exchangers into a grid, realising different powers. It was ment to specify the most accurate micro channel heat exchangers connection, in order to increase the intensity of the heat exchange process. Studied problem was about heating the ORC working medium (R134a) using waste heat (hot water). In this paper, there has been studied the fenomenon of the heat exchange process in the micro channel heat exchanger grid, which will be further called the integral heat exchanger. There have been studied three cases of micro channel heat exchangers connections, such as: parallel-parallel, parallel (heating water)-serial (R134a) and parallel (R134a) – serial (heating water). On the basis of the results of the analytical analysis it has been stated, that the serial (heating water)-parallel (R134a 7) micro channel heat exchangers combination is the most suitable for the most intensive heat exchange.
    Źródło:
    Rocznik Ochrona Środowiska; 2015, Tom 17, cz. 1; 485-506
    1506-218X
    Pojawia się w:
    Rocznik Ochrona Środowiska
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Possibilities of applications of stirling engine in cogeneration systems
    Autorzy:
    Boruta, G.
    Drogosz, P.
    Nitkiewicz, S.
    Piętak, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/247308.pdf
    Data publikacji:
    2012
    Wydawca:
    Instytut Techniczny Wojsk Lotniczych
    Tematy:
    Stirling engines
    cogeneration systems
    trigeneration systems
    micro agropower plants
    power grid
    distributed energy resource (DER)
    Opis:
    This study takes into account engines working in Stirling cycles in cogeneration systems. Stirling engines have been selected because of their characteristics of exploitation. The possibility of their use in cogeneration systems is more favourable in comparison with other combustion engines because they can avoid usage of industrial and transport fuels. The Stirling engines enable the use of biomass, agricultural and other waste energy sources in micro tri- and cogeneration plants dedicated for the use in agriculture and forestry. Considering such applications, three types of usage structures of Stirling engines are proposed. All three structures are dedicated to install in small residential or farm buildings. These three types of structure are named: “type master”, “type slave” and “type customer”. In accordance with the proposed structures, different types of engine constructions are discussed, too. At the same time, the authors described the dependences between Stirling engines and electric power energy systems. The arguments of grid power systems and dispersed energy resource in text were reviewed. After that overview, some legal problems are discussed. Finally, the conception of independent dispersed micro agropower system and some technical equipment were described. Technical realization of the proposed conception requires: proper type, installation and usage of Stirling engines and proper expectations of achieved results.
    Źródło:
    Journal of KONES; 2012, 19, 2; 67-75
    1231-4005
    2354-0133
    Pojawia się w:
    Journal of KONES
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Analysis of Energy and Power Generation in a Photovoltaic Micro installation Interconnected with a Low Voltage Grid
    Analiza wytwarzania energii i mocy w mikroinstalacji fotowoltaicznej współpracującej z siecią niskiego napięcia
    Autorzy:
    Sobierajski, M.
    Rojewski, W.
    Powiązania:
    https://bibliotekanauki.pl/articles/397273.pdf
    Data publikacji:
    2015
    Wydawca:
    ENERGA
    Tematy:
    odnawialne źródła energii
    mikroinstalacja fotowoltaiczna
    sieć dystrybucyjna niskiego napięcia
    renewable energy sources
    photovoltaic micro installation
    low-voltage distribution grid
    Opis:
    The paper discusses the performance of the 15 kW photovoltaic micro installation located on the roof of building D-1 of the Faculty of Electrical Engineering at Wroclaw University of Technology. The micro installation is connected to the low voltage grid, which supplies the new, air-conditioned building D-20. The paper discusses the energy and power generation output in yearly, monthly, and daily intervals. The micro installation’s output in the summer morning peaks is compared with the daily wind generation against the background of the demand, generation, regulation reserve, and overhauls in the National Power System.
    W artykule analizowana jest praca mikroinstalacji fotowoltaicznej o mocy 15 kW, umieszczonej na dachu budynku D-1 Wydziału Elektrycznego Politechniki Wrocławskiej. Mikroinstalacja jest przyłączona do sieci niskiego napięcia, z której zasilany jest nowy klimatyzowany budynek D-20. Omówiono wytwarzanie energii i mocy w przedziale rocznym, miesięcznym i dobowym. Generacja w mikroinstalacji w szczycie rannym w miesiącach letnich porównana jest z dobową generacją wiatrową na tle zapotrzebowania, generacji, rezerwy regulacyjnej i remontów w Krajowym Systemie Elektroenergetycznym (KSE).
    Źródło:
    Acta Energetica; 2015, 4; 111-119
    2300-3022
    Pojawia się w:
    Acta Energetica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Pseudo-random simulation of node voltages in medium and low voltage grids with photovoltaic micro-installations
    Pseudolosowa symulacja napięć węzłowych w sieci średniego i niskiego napięcia z fotowoltaicznymi mikroinstalacjami
    Autorzy:
    Sobierajski, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/397261.pdf
    Data publikacji:
    2017
    Wydawca:
    ENERGA
    Tematy:
    low voltage grid
    photovoltaic micro-installation
    pseudo-random numbers
    statistical analysis
    mikroinstalacja fotowoltaiczna
    sieć niskiego napięcia
    liczby pseudolosowe
    analiza statystyczna
    Opis:
    Power generation by photovoltaic cells depends on random weather conditions, so at the planning stage the active powers output to the grid from photovoltaic micro-installations can be treated as multidimensional random variables with equal probability distribution. Such microinstallations’ passive power outputs depend on the pre-set power factor and therefore should be treated as multidimensional functions of the random active power outputs. Likewise, the received input powers can be treated the same way. Random changes in the output and input powers can be simulated using a pseudo-random number generator. Node voltages corresponding to the random outputs and inputs are derived from the iterative solution of nodal equations for each pseudo-random power balance. The resulting voltages are subjected to statistical analysis. This allows estimating the probability distribution, expected values and standard deviations, and to calculate the probabilities of exceeding the permitted voltage deviations. These considerations will be illustrated by an example calculation.
    Wytwarzanie mocy przez ogniwa fotowoltaiczne zależy od losowych warunków pogodowych, dlatego na etapie planowania moce czynne wprowadzane do sieci przez mikroinstalacje fotowoltaiczne mogą być traktowane jako wielowymiarowa zmienna losowa o równomiernym rozkładzie prawdopodobieństwa. Natomiast wytwarzane moce bierne mikroinstalacji zależą od zadanego współczynnika mocy i dlatego powinny być traktowane jako wielowymiarowa funkcja losowych wytwarzanych mocy czynnych. Podobnie mogą być traktowane moce odbierane. Losowe zmiany mocy generowanych i odbieranych mogą być symulowane z wykorzystaniem generatora liczb pseudolosowych. Napięcia węzłowe odpowiadające losowym generacjom i odbiorom wynikają z iteracyjnego rozwiązania równań węzłowych dla każdej pseudolosowej realizacji bilansów mocy. Otrzymane wartości napięć poddane są analizie statystycznej. Pozwala to oszacować rozkład prawdopodobieństwa, wartości oczekiwane i odchylenia standardowe oraz wyliczyć prawdopodobieństwa przekroczenia dopuszczalnych odchyleń napięć. Rozważania zostaną zilustrowane przykładem obliczeniowym.
    Źródło:
    Acta Energetica; 2017, 2; 203-208
    2300-3022
    Pojawia się w:
    Acta Energetica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    A review of the importance of synchrophasor technology, smart grid, and applications
    Autorzy:
    Baba, Maveeya
    Nor, Nursyarizal B.M.
    Sheikh, Aman
    Nowakowski, Grzegorz
    Masood, Faisal
    Rehman, Masood
    Irfan, Muhammad
    Arefin, Ahmed Amirul
    Kumar, Rahul
    Baba, A. Momin
    Powiązania:
    https://bibliotekanauki.pl/articles/2173713.pdf
    Data publikacji:
    2022
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    phasor measurement unit
    PMU
    micro-PMU
    Global Positioning System
    GPS
    optimal PMU placement
    smart grid
    SG
    jednostka pomiaru fazorów
    mikro-PMU
    globalny system pozycjonowania
    optymalne rozmieszczenie PMU
    sieć inteligentna
    Opis:
    The electrical network is a man-made complex network that makes it difficult to monitor and control the power system with traditional monitoring devices. Traditional devices have some limitations in real-time synchronization monitoring which leads to unwanted behavior and causes new challenges in the operation and control of the power systems. A Phasor measurement unit (PMU) is an advanced metering device that provides an accurate real-time and synchronized measurement of the voltage and current waveforms of the buses in which the PMU devices are directly connected in the grid station. The device is connected to the busbars of the power grid in the electrical distribution and transmission systems and provides time-synchronized measurement with the help of the Global Positioning System (GPS). However, the implementation and maintenance cost of the device is not bearable for the electrical utilities. Therefore, in recent work, many optimization approaches have been developed to overcome optimal placement of PMU problems to reduce the overall cost by providing complete electrical network observability with a minimal number of PMUs. This research paper reviews the importance of PMU for the modern electrical power system, the architecture of PMU, the differences between PMU, micro-PMU, SCADA, and smart grid (SG) relation with PMU, the sinusoidal waveform, and its phasor representation, and finally a list of PMU applications. The applications of PMU are widely involved in the operation of power systems ranging from power system control and monitor, distribution grid control, load shedding control and analyses, and state estimation which shows the importance of PMU for the modern world.
    Źródło:
    Bulletin of the Polish Academy of Sciences. Technical Sciences; 2022, 70, 6; art. no. e143826
    0239-7528
    Pojawia się w:
    Bulletin of the Polish Academy of Sciences. Technical Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-9 z 9

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