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    Wyświetlanie 1-10 z 10
    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:
    Short-term wind power combined prediction based on EWT-SMMKL methods
    Autorzy:
    Li, Jun
    Ma, Liancai
    Powiązania:
    https://bibliotekanauki.pl/articles/1955182.pdf
    Data publikacji:
    2021
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    combined model
    empirical wavelet transform
    prediction
    soft margin multiple kernel learning
    wind power
    model łączony
    empiryczna transformacja falkowa
    przewidywanie
    miękki margines uczenia wielokrotnego jądra
    energia wiatrowa
    Opis:
    Since wind power generation has strong randomness and is difficult to predict, a class of combined prediction methods based on empirical wavelet transform (EWT) and soft margin multiple kernel learning (SMMKL) is proposed in this paper. As a new approach to build adaptive wavelets, the main idea is to extract the different modes of signals by designing an appropriate wavelet filter bank. The SMMKL method effectively avoids the disadvantage of the hard margin MKL method of selecting only a few base kernels and discarding other useful basis kernels when solving for the objective function. Firstly, the EWT method is used to decompose the time series data. Secondly, different SMMKL forecasting models are constructed for the sub-sequences formed by each mode component signal. The training processes of the forecasting model are respectively implemented by two different methods, i.e., the hinge loss soft margin MKL and the square hinge loss soft margin MKL. Simultaneously, the ultimate forecasting results can be obtained by the superposition of the corresponding forecasting model. In order to verify the effectiveness of the proposed method, it was applied to an actual wind speed data set from National Renewable Energy Laboratory (NREL) for short-term wind power single-step or multi-step time series indirectly forecasting. Compared with a radial basic function (RBF) kernel- based support vector machine (SVM), using SimpleMKL under the same condition, the experimental results show that the proposed EWT-SMMKL methods based on two different algorithms have higher forecasting accuracy, and the combined models show effectiveness.
    Źródło:
    Archives of Electrical Engineering; 2021, 70, 4; 801-817
    1427-4221
    2300-2506
    Pojawia się w:
    Archives of Electrical Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Frequency control of voltage sourced converter-based multi-terminal direct current interconnected system based on virtual synchronous generator
    Autorzy:
    Li, Congshan
    Zhang, Xiaowei
    He, Ping
    Zhen, Zikai
    Zhao, Kefeng
    Powiązania:
    https://bibliotekanauki.pl/articles/27309962.pdf
    Data publikacji:
    2023
    Wydawca:
    Polska Akademia Nauk. Czasopisma i Monografie PAN
    Tematy:
    adaptive droop control
    power margin
    VSG
    virtual synchronous generator
    Opis:
    In response to the inability of the flexible DC transmission system connected to the AC grid under conventional control strategies to provide inertia to the system as well as to participate in frequency regulation, a virtual synchronous generator (VSG) control strategy is proposed for a voltage source converter (VSC)-based multi-terminal high-voltage direct current (VSC-MTDC) interconnection system. First, the virtual controller module is designed by coupling AC frequency and active power through virtual inertia control, so that the VSC-MTDC system can provide inertia response for AC grid frequency. Second, by introducing the power margin of the converter station into the droop coefficient, the unbalanced power on the DC side is reasonably allocated to reduce the overshoot of the DC voltage in the regulation process. Finally, the power regulation capability of the normal AC system is used to provide power support to the fault end system, reducing frequency deviations and enabling inter-regional resource complementation. The simulation model of the three-terminal flexible DC grid is built in PSCAD/EMTDC, and the effectiveness of the proposed control strategy is verified by comparing the conventional control strategy and the additional frequency control strategy.
    Źródło:
    Archives of Electrical Engineering; 2023, 72, 4; 971--986
    1427-4221
    2300-2506
    Pojawia się w:
    Archives of Electrical Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    “All in their power”: a gloss to the European Court of Human Rights’ judgement in the case of Tsezar and Others v. Ukraine
    „Wszystko, co w ich mocy”: glosa do wyroku Europejskiego Trybunału Praw Człowieka w sprawie Tsezar i inni przeciwko Ukrainie
    Autorzy:
    Krakhmalova, Kateryna
    Powiązania:
    https://bibliotekanauki.pl/articles/1895824.pdf
    Data publikacji:
    2021-02-23
    Wydawca:
    Uniwersytet Opolski
    Tematy:
    Europejski Trybunał Praw Człowieka
    wojna hybrydowa
    Ukraina
    dostęp do sądu
    zawieszenie świadczeń społecznych
    przesiedlenia wewnętrzne
    bezpieczeństwo i prawa człowieka
    zakres obowiązków państwa broniącego się przed agresją
    margines uznania
    European Court of Human Rights
    hybrid warfare
    Ukraine
    access to court
    suspension of social payments
    internal displacement
    security and human rights
    extent of obligations of the state defending itself against aggression
    margin of appreciation
    Opis:
    This gloss summarizes and analyzes one of the recent key judgments of the European Court of Human Rights’ (ECtHR) in the case concerning Ukraine, while considering the context of hybrid warfare and the special place case-law of the ECtHR has in the Ukrainian legal system. The judgement addresses both: the right to access to the courts and the issue of suspended social payments due to hostilities, the extent of obligations of the state defending itself against aggression towards its nationals and the delicate balance between security, human rights and humanitarian considerations; and as such has much deeper relevance and applicability than to Ukraine alone.
    Glosa ta podsumowuje i analizuje jeden z niedawnych kluczowych wyroków Europejskiego Trybunału Praw Człowieka w sprawie Ukrainy, jednocześnie zwracając uwagę na kontekst wojny hybrydowej i szczególne miejsce, jakie orzecznictwo ETPCz zajmuje w ukraińskim systemie prawnym. Wyrok ten porusza kwestie prawa dostępu do sądu oraz zawieszenia świadczeń społecznych wskutek działań wojennych, zakresu obowiązków państwa broniącego się przed agresją wobec swoich obywateli oraz delikatnej równowagi pomiędzy bezpieczeństwem, prawami człowieka i względami humanitarnymi oraz jako taki jest o wiele głębszy i relewantny w znacznie szerszym zakresie, niż tylko w stosunku do Ukrainy.
    Źródło:
    Opolskie Studia Administracyjno-Prawne; 2020, 18, 4; 139-149
    2658-1922
    Pojawia się w:
    Opolskie Studia Administracyjno-Prawne
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Wybrane wskaźniki produkcyjne a poziom wyposażenia oraz moc parku maszynowego gospodarstw rolnych
    Selected production indexes and level of equipment as well as the power of a machinery park of agricultural farms
    Autorzy:
    Kowalski, J.
    Nowak, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/286843.pdf
    Data publikacji:
    2011
    Wydawca:
    Polskie Towarzystwo Inżynierii Rolniczej
    Tematy:
    wyposażenie techniczne
    moc
    nadwyżka bezpośrednia
    technical infrastructure
    power
    standard gross margin
    Opis:
    W pracy określona została wartość nadwyżki bezpośredniej oraz wyposażenie techniczne gospodarstw rolnych. Dokonano także oceny nakładów bezpośrednich i produkcji końcowej brutto w badanych obiektach. Badania dotyczyły 30 gospodarstw powiatu miechowskiego. Średnia wartość nadwyżki bezpośredniej z produkcji roślinnej wyniosła 1,68 tys. PLN*ha-1. Natomiast z produkcji zwierzęcej jedynie 1,03 tys. PLN*ha-1 UR.
    The study presents the value of standard gross margin as well as technical infrastructure of agricultural farms. Assessment of direct inputs and gross final production in the researched objects was carried out. The research covered 30 farms of miechowski powiat. Average value of standard gross margin from plant production was 1.68 thousand of PLN*ha-1. Whereas, from animal production only 1.03 thousand PLN*ha-1 of arable land.
    Źródło:
    Inżynieria Rolnicza; 2011, R. 15, nr 6, 6; 93-100
    1429-7264
    Pojawia się w:
    Inżynieria Rolnicza
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Influence of nonlinearities in sensor and actuator on the operation of the rotational speed control system of a roadheader cutting head
    Autorzy:
    Joostberens, Jarosław
    Heyduk, Adam
    Powiązania:
    https://bibliotekanauki.pl/articles/27324344.pdf
    Data publikacji:
    2022
    Wydawca:
    Instytut Techniki Górniczej KOMAG
    Tematy:
    roadheader
    speed control system
    rotational encoder
    power electronic converter
    stability margin
    Opis:
    The paper presents a discussion on the selected nonlinearities existing in sensor and actuator subsystems of the roadheader cutting head speed control system. There have been concerned the most significant nonlinearities - rotational speed encoder and frequency rate limiter in the input of the power electronic converter. These nonlinearities significantly reduce the stability margin of the control system and therefore should be minimized. They have also an influence on allowable speed controller settings range. Reduction in the controller settings can result in a decrease in the quality of operation of the entire control system. The measurement time of the encoder-based speed sensing should be as short as possible, or continuous measurement (like tachogenerator) should be used. The frequency converter should be overmatched to ensure current overload capability – allowing an increase in the permissible rate of output voltage frequency change.
    Źródło:
    Mining Machines; 2022, 40, 4; 249--257
    2719-3306
    Pojawia się w:
    Mining Machines
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    A self-scheduling strategy of virtual power plant with electric vehicles considering margin indexes
    Autorzy:
    Jiao, Fengshun
    Deng, Yongsheng
    Li, Duo
    Wei, Bo
    Yue, Chengyan
    Cheng, Meng
    Zhang, Yapeng
    Zhang, Jiarui
    Powiązania:
    https://bibliotekanauki.pl/articles/949880.pdf
    Data publikacji:
    2020
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    electric vehicle (EV)
    response time margin (RTM)
    scheduling strategy
    state of charge margin (SOCM)
    virtual power plant (VPP)
    Opis:
    From the perspective of a virtual power plant (VPP) with electric vehicles (EVs), a self-scheduling strategy considering the response time margin (RTM) and state of charge margin (SOCM) is proposed. Firstly, considering the response state of the state of charge (SOC) and charge-discharge state of EVs, a VPP based response capacity determination model of EVs is established. Then, RTM and SOCM indexes are introduced on the basis of the power system scheduling target and the EV users’ traveling demands. The RTM and SOCM indices are calculated and then are used to generate a priority sequence of responsive EVs for the VPP. In the process of the scheduling period and rolling iteration, the scheduling schemes of the EVs in the VPP for multiple time periods are determined. Finally, the VPP self-scheduling strategy is validated by taking an VPP containing three kinds of EV users as an example. Simulation results show that with the proposed strategy, the VPP is able to respond to the scheduling power from the power system, while ensuring the traveling demands of the EV users at the same time.
    Źródło:
    Archives of Electrical Engineering; 2020, 69, 4; 907-920
    1427-4221
    2300-2506
    Pojawia się w:
    Archives of Electrical Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Siódme: „Nie kradnij”. O średniowiecznym odkrywaniu rynku na marginesie książki Paola Prodiego
    “Seventh: You shall not steal” – notes on the medieval „discovering” of the market in the margin of Paulo Prodi’s book
    Autorzy:
    Bukała, Marcin W.
    Powiązania:
    https://bibliotekanauki.pl/articles/2075798.pdf
    Data publikacji:
    2018-12-30
    Wydawca:
    Naukowe Towarzystwo Tomistyczne
    Tematy:
    rynek
    forum
    VII Przykazanie
    kradzież
    Paolo Prodi
    Średniowiecze
    cywilizacja Zachodu
    Arystoteles
    Franciszek Accursius
    Rajmund z Penyafort
    Klarus z Florencji
    Tomasz z Akwinu
    Max Weber
    historia
    historia idei
    etyka
    teologia
    forum sumienia
    prawo
    prawo kanoniczne
    etyka gospodarcza
    idee ekonomiczne scholastyków
    kupiectwo
    władza ekonomiczna
    słuszna cena
    powszechne oszacowanie
    dobro wspólne (bonum commune)
    market
    VII Commandment
    theft
    Middle Ages
    civilisation of the West
    Aristotle
    Francis Accursius
    Raymond of Penyafort
    Clarus of Florence
    Thomas Aquinas
    history
    history of ideas
    ethics
    theology
    forum of conscience
    law
    canon law
    ethics of economic life
    scholastic economic ideas
    merchants
    economic power
    just price
    common estimation
    common good (bonum commune)
    Opis:
    In the article, the topic of the medieval „discovering” of the market is discussed, with the references to the Paolo Prodis’ book Settimo non rubare. Furto e mercato nella storia dell’Occidente. The author of the book, following Harold Berman, finds the changes in the 11th and 12th century Church, as the decisive mile stones in the development of the civilization of Western Christianity. The mentioned „papal revolution” led to the historical distinction between the spiritual and the political sphere, and later, to the autonomy of economic one. Accordingly, the Italian historian rejects the thesis that Enlightenment was the new beginning in the European history. In the P. Prodi’s analysis, the Latin term forum plays the crucial role. The word signified the place, square, especially the place where court proceedings occurred. Therefore, in the later abstract sense forum signified criteria or rules of judgement: both in the juridical meaning (forum civile, f. canonico, f. consciantiae), and the economic one, in which forum meant exactly „the market”. The “discovering” of the market rules was a consequence the development of the theoretical reasoning about mercantile activity. It was essentially related to the concepts of the just price (iustum pretium) and the common estimation (communis aestimatio). According to P. Prodi the common character of the estimation was of essential importance, as well as the new version of the Roman rule Res tantum valet, quantum vendi potest, with the medevial addendum: scilicet communiter. The author criticised the view, that the process of defining of the market was mainly the result of reception of Aristotelian Ethics and Politics. He underlined that in the penitential handbooks of the 12th and 13th century the focus was significantly shifted from the vice of avarice to the commandment „You shall not steal”; moreover the significant violation of the rules of fair market exchange begun to be considered as a sin against this commandment. In the article, the significance of the application of the notion forum commune by Thomas Aquinas (in the treatise on credit sale) was underlined. The interconnection between the concept of the market and the idea of common good was expressed in the juxtaposition of terms: forum commune – bonum commune. M. W. Bukała observes that the thesis about the limited influence of Aristotelian thought on the examined issue can be additionally confirmed by the analysis of the Article on mercantile profit in Summa Theologiae by St. Thomas (II-II, q. 77, a. 4), where Aquinas distances himself from the Philosopher’s view. The P. Prodi discourses were amended by the significant distinction: not every violation of ethics of economic life was considered as the theft by the medieval moralists – e.g.: the determinatio of the casus of buying grain with the deferred delivery for an undercut price, in canon „Naviganti” (X 5.5.19, 2do), and in the related comments of the 13th century canonist, Clarus Florentinus. Moreover, the Jacques Le Goff’s critique of the Prodi’s approach was undermined.
    Źródło:
    Rocznik Tomistyczny; 2018, 7; 177-192
    2300-1976
    Pojawia się w:
    Rocznik Tomistyczny
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Voltage and local stability margin regulation of the receiving node
    Autorzy:
    Brusiłowicz, B.
    Szafran, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/410539.pdf
    Data publikacji:
    2012
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    local voltage stability
    reactive power compensation
    load shedding
    transformer tap control
    Opis:
    Regulation methods of the receiving node voltage has been analyzed in the paper. There has been used Thevenin equivalent to develop, simulate and analyze these methods. The paper presents also an on-line method of Thevenin model parameters updating using local phasor measurements. Based on this model influence of the voltage regulation on the local stability margin of the receiving node has been analyzed. Three methods of voltage regulation: transformer tap changing, compensation of reactive power and under voltage load shedding have been examined.
    Źródło:
    Present Problems of Power System Control; 2012, 2; 53-63
    2084-2201
    Pojawia się w:
    Present Problems of Power System Control
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Ultra-low Power FinFET SRAM Cell with Improved Stability Suitable for Low Power Applications
    Autorzy:
    Birla, Shilpi
    Powiązania:
    https://bibliotekanauki.pl/articles/226772.pdf
    Data publikacji:
    2019
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    FinFET
    RSNM
    WSNM
    hold margin
    subthreshold
    leakage power
    Opis:
    In this paper, a new 11T SRAM cell using FinFET technology has been proposed, the basic component of the cell is the 6T SRAM cell with 4 NMOS access transistors to improve the stability and also makes it a dual port memory cell. The proposed cell uses a header scheme in which one extra PMOS transistor is used which is biased at different voltages to improve the read and write stability thus, helps in reducing the leakage power and active power. The cell shows improvement in RSNM (Read Static Noise Margin) with LP8T by 2.39x at sub-threshold voltage 2.68x with D6T SRAM cell, 5.5x with TG8T. The WSNM (Write Static Noise Margin) and HM (Hold Margin) of the SRAM cell at 0.9V is 306mV and 384mV. At sub-threshold operation also it shows improvement. The Leakage power reduced by 0.125x with LP8T, 0.022x with D6T SRAM cell, TG8T and SE8T. Also, impact of process variation on cell stability is discussed.
    Źródło:
    International Journal of Electronics and Telecommunications; 2019, 65, 4; 603-609
    2300-1933
    Pojawia się w:
    International Journal of Electronics and Telecommunications
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-10 z 10

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