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Tytuł:
Power flow analysis and control of distributed FACTS devices in power system
Autorzy:
Anand, V.
Mallik, S. K.
Powiązania:
https://bibliotekanauki.pl/articles/141190.pdf
Data publikacji:
2018
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
D-FACTS
UPFC
power flow control
stability
THD
FACTS
Opis:
The deployment of a distributed power-flow controller (DPFC) in a single- machine infinite-bus power system with two parallel transmission lines are considered for the analysis in this paper. This paper presents the network analysis of the DPFC for power flow control. The performance is evaluated on a given test system with a single line-to- ground fault. The improvement in the stability as well as power quality is evident from the results. Thus the DPFC has the ability to enhance the stability and power quality of the system.
Źródło:
Archives of Electrical Engineering; 2018, 67, 3; 545--561
1427-4221
2300-2506
Pojawia się w:
Archives of Electrical Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Multi-type FACTS placement for loss minimization using biogeography based optimization
Autorzy:
Subramanian, A.
Ravi, G.
Powiązania:
https://bibliotekanauki.pl/articles/140825.pdf
Data publikacji:
2012
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
biogeography based optimization
FACTS devices
Opis:
This paper presents a new strategy for optimal placement of multi-type FACTS devices with a view to minimize losses besides enhancing the voltage profile using biogeography based optimization. The strategy places three types of FACTS devices that include static VAR compensator, thyristor controlled series compensator and unified power flow controller; and offers optimal locations for placement, type and parameters of the FACTS devices. Test results on IEEE 14, 30 and 57 bus systems reveal the superiority of the algorithm.
Źródło:
Archives of Electrical Engineering; 2012, 61, 4; 517-531
1427-4221
2300-2506
Pojawia się w:
Archives of Electrical Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Comparative study of GA & DE algorithm for the economic operation of a power system using FACTS devices
Autorzy:
Bhattacharyya, B.
Gupta, V. K.
Kumar, S.
Powiązania:
https://bibliotekanauki.pl/articles/141459.pdf
Data publikacji:
2013
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
FACTS devices
line power flow
FACTS devices & its optimal locations
genetic algorithm
differential evolution technique
Opis:
The problem of improving the voltage profile and reducing power loss in electrical networks must be solved in an optimal manner. This paper deals with comparative study of Genetic Algorithm (GA) and Differential Evolution (DE) based algorithm for the optimal allocation of multiple FACTS (Flexible AC Transmission System) devices in an interconnected power system for the economic operation as well as to enhance loadability of lines. Proper placement of FACTS devices like Static VAr Compensator (SVC), Thyristor Controlled Switched Capacitor (TCSC) and controlling reactive generations of the generators and transformer tap settings simultaneously improves the system performance greatly using the proposed approach. These GA & DE based methods are applied on standard IEEE 30 bus system. The system is reactively loaded starting from base to 200% of base load. FACTS devices are installed in the different locations of the power system and system performance is observed with and without FACTS devices. First, the locations, where the FACTS devices to be placed is determined by calculating active and reactive power flows in the lines. GA and DE based algorithm is then applied to find the amount of magnitudes of the FACTS devices. Finally the comparison between these two techniques for the placement of FACTS devices are presented.
Źródło:
Archives of Electrical Engineering; 2013, 62, 4; 541-552
1427-4221
2300-2506
Pojawia się w:
Archives of Electrical Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Design, Testing, and Analysis of STATCOM and TCSC for Real-Time Simulation
Autorzy:
Koundal, Govind
Shimi, S. L.
Powiązania:
https://bibliotekanauki.pl/articles/1059442.pdf
Data publikacji:
2019
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
FACTS
FCT
STATCOM
TCSC
Transient Stability
Opis:
FACTS controllers are found to be effective in improving transient stability of power system. WSCC 9-bus system has been utilized as test system developed in MATLAB/Simulink software. This paper investigates the improvement of transient stability of a 3-machine 9-bus WSCC system using STATCOM and TCSC and their relative performances are studied with the help of simulation results validated with OPAL-RT real time simulator. Particular attention is paid to real-time simulation approach which provides adequate and comprehensive modeling of electric power systems (EPS) containing FACTS. Simulation results are quite encouraging and show the effectiveness of STATCOM and TCSC in improving transient stability of the test system.
Źródło:
World Scientific News; 2019, 128, 2; 197-215
2392-2192
Pojawia się w:
World Scientific News
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Optimal LQR controller in CSC based STATCOM using GA and PSO
Autorzy:
Gupta, S.
Tripathi, R. K.
Powiązania:
https://bibliotekanauki.pl/articles/140927.pdf
Data publikacji:
2014
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
CSC
FACTS
AI techniques
LQR
STATCOM
Opis:
The static synchronous compensator (STATCOM) is the multipurpose FACTS device with the multiple input and multiple output system for the enhancement of its dynamic performance in power system. Based on artificial intelligence (AI) optimization technique, a novel controller is proposed for CSC based STATCOM. In this paper, the CSC based STATCOM is controlled by the LQR. But the best constant values for LQR controller's parameters are obtained laboriously through trial and error method, although time consuming. So the goal of this paper is to investigate the ability of AI techniques such as genetic algorithm (GA) and particle swarm optimization (PSO) methods to search the best values of LQR controller's parameters in a very short time with the desired criterion for the test system. Performances of the GA, PSO & ABC based LQR controllers are also compared. Applicability of the proposed scheme is demonstrated through simulation in MATLAB and the simulation results are shown an improvement in the input-output response of CSC-STATCOM.
Źródło:
Archives of Electrical Engineering; 2014, 63, 3; 469-487
1427-4221
2300-2506
Pojawia się w:
Archives of Electrical Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
An Explanatory Framework for Legal Grounding
Model eksplanacyjny ugruntowania w prawie
Autorzy:
Janik, Bartosz
Powiązania:
https://bibliotekanauki.pl/articles/11855313.pdf
Data publikacji:
2023
Wydawca:
Stowarzyszenie Filozofii Prawa i Filozofii Społecznej – Sekcja Polska IVR
Tematy:
grounding
explanation
philosophy of law
legal facts
social facts
ugruntowanie
filozofia prawa
wyjaśnianie
fakty prawne
fakty społeczne
Opis:
The objective of this article is to provide an explanatory framework for legal grounding. Grounding, understood in recent years as a metaphysical determination, has proved to be a fruitful object of inquiry for legal theorists trying to explain the thesis about the relationship between social facts and legal facts in metaphysical terms. However, the debate on the use of the notion of grounding in the philosophy of law lacks a concise and precise differentiation of the various assumptions behind grounding that philosophers have recently discussed. This article offers a prospect for analysis of a debate about grounding of legal facts and an interpretation of focal terms in light of recent metaphysical debates.
Celem niniejszego artykułu jest przedstawienie modelu eksplanacyjnego dla ugruntowania w prawie. Ugruntowanie, rozumiane w ostatnich latach jako metafizyczna determinacja, okazało się być dość owocnym przedmiotem dociekań teoretyków prawa, próbujących eksplikować w kategoriach metafizycznych tezę o relacji między faktami społecznymi a faktami prawnymi. Jednakże w debacie dotyczącej wykorzystania pojęcia ugruntowania w filozofii prawa brakuje namysłu nad różnymi założeniami leżącymi u podstaw możliwości wykorzystania tego pojęcia związanego z debatą dotyczącą ugruntowania która odbywa się we współczesnej filozofii. Niniejszy artykuł oferuje nową perspektywę analizy debaty na temat ugruntowania faktów prawnych oraz interpretację centralnych dla tej debaty terminów w świetle najnowszych debat metafizycznych.
Źródło:
Archiwum Filozofii Prawa i Filozofii Społecznej; 2023, 35, 2; 34-42
2082-3304
Pojawia się w:
Archiwum Filozofii Prawa i Filozofii Społecznej
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Modeling and Simulation of Multi-machine System Using UPFC for Enhancing Transient Stability
Autorzy:
Singh, Amritpreet
Mathew, Lini
Powiązania:
https://bibliotekanauki.pl/articles/1158636.pdf
Data publikacji:
2018
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
FACTS
Reactive Power compensation
Transient Stability
UPFC
Opis:
In this paper, transient stability of IEEE 9- bus system combined with Unified Power Flow Controller (UPFC), has been accomplished. UPFC based on Voltage Source Controller (VSC) has a higher switching frequency, an obvious voltage harmonic and a lower voltage level. Under a symmetrical three-phase short circuit with a different fault locations were used and the load angle variation also studied to test the control performance. The multi machine system combined with UPFC controller, perform outstanding to reduce damping oscillation in power system observed in results of simulation.
Źródło:
World Scientific News; 2018, 114; 152-163
2392-2192
Pojawia się w:
World Scientific News
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Wittgenstein’s inspirations. On the earlier philosophy of Professor Bogusław Wolniewicz
W kręgu wpływów ideowych Ludwiga Wittgensteina. O wcześniejszej filozofii Profesora Bogusława Wolniewicza
Autorzy:
Stuchliński, Józef Andrzej
Powiązania:
https://bibliotekanauki.pl/articles/2097142.pdf
Data publikacji:
2018
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
facts
things
ontology
hypostases
fakty
rzeczy
ontologia
hipostazy
Opis:
Wczesne stanowisko filozoficzne Profesora Bogusława Wolniewicza nawiązywało do poglądów nazywanych pierwszą filozofią Ludwiga Wittgensteina, wyrażoną w Traktacie logiczno-filozoficznym. Znalazło to swój wyraz najpierw w książce Rzeczy i fakty. Wstęp do pierwszej filozofii Wittgensteina (1968), a ostatecznie w monografii Ontologia sytuacji. Podstawy i zastosowania (1985). W obu przypadkach, poglądy filozoficzne Profesora Wolniewicza były wyrażane w znacznej mierze w ujęciu uprzedmiotowiającym pojęcia semiotyczne i logiczne (hipostazy), co też, w obu przypadkach, wydawało mi się wątpliwe. Ontologia sytuacji może być owocnie traktowana jako ogólna formalna teoria semantycznych korelatów właściwych dla wypowiedzi zdaniowych.
Źródło:
Przegląd Filozoficzny. Nowa Seria; 2018, 3; 189-197
1230-1493
Pojawia się w:
Przegląd Filozoficzny. Nowa Seria
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Philosophical difficulties of stakeholder theory
Autorzy:
Soin, Maciej
Powiązania:
https://bibliotekanauki.pl/articles/653156.pdf
Data publikacji:
2018
Wydawca:
Uniwersytet Łódzki. Wydawnictwo Uniwersytetu Łódzkiego
Tematy:
stakeholder theory
pragmatism
facts and values
Freeman
Rorty
Opis:
Philosophical difficulties of stakeholder theory-which plays an important role in CSR and business ethics-are mainly connected to the questions of its status and justification. What sense does stakeholder theory have: descriptive, instrumental or normative? And if normative, why then should executives worry about multiple stakeholder demands? It is well known that Freeman, one of the most important authors of stakeholder theory, deliberately disregarded these problems. In philosophical questions, he invoked Rorty’s pragmatism that in his opinion effectively undermined the “positivistic” dichotomy between facts and values, science and ethics, and enabled stakeholder theory to be understood as both descriptive and normative. The article presents some difficulties connected with this view, focusing on its dubious assumptions and unfavourable consequences. These assumptions contain a false dilemma, taken from Rorty, which states that knowledge follows either a rule of representation or a rule of solidarity. One of the unfavourable consequences is the conclusion that stakeholder theory may be true only if its followers are able to force the stakeholders to accept its truthfulness. The main thesis of the article says that, because of pragmatic justification, stakeholder theory became a sort of arbitrary narration, which is unable to deal with its (empirical) misuses. However, a more traditional view on facts and values enables us to appreciate the descriptive advantages of the theory and to identify difficulties connected with its normative layer. From this point of view, the attempt at a pragmatic interpretation of stakeholder theory was a misunderstanding that should be withdrawn from circulation.
Źródło:
Annales. Etyka w Życiu Gospodarczym; 2018, 21, 7; 75-84
1899-2226
2353-4869
Pojawia się w:
Annales. Etyka w Życiu Gospodarczym
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The new big picture for linguistics: Complex systems
Autorzy:
Kretzschmar Jr., William A.
Powiązania:
https://bibliotekanauki.pl/articles/2134800.pdf
Data publikacji:
2018-12-01
Wydawca:
Uniwersytet im. Adama Mickiewicza w Poznaniu
Tematy:
complex systems
A-curve
emergence
alternative facts
Big Data
Opis:
In the history of linguistics there have been crucial moments when those of us interestedin language have essentially changed the way we study our subject. We standnow at such a moment. In this presentation I will review the history of linguistics inorder to highlight some past important changes in the field, and then turn to wherewe stand now. Some things that we thought we knew have turned out not to be true,like the systematic, logical nature of languages. Other things that we had not suspected,like a universal underlying emergent pattern for all the features of a language, arenow evident. This emergent pattern is fractal, that is, we can observe the same distributionalpattern in frequency profiles for linguistic variants at every level of scale inour analysis. We also have hints that time, as the persistence of a preference for particularvariants of features, is a much more important part of our language than wehad previously believed. We need to explore the new realities of language as we nowunderstand them, chief among them the idea that patterned variation, not logical system,is the central factor in human speech. In order to account for what we now understand,we need to get used to new methods of study and presentation, and placenew emphasis on different communities and groups of speakers. Because the underlyingpattern of language is fractal, we need to examine the habits of every group ofspeakers at every location for themselves, as opposed to our previous emphasis onoverall grammars. We need to make our studies much more local, as opposed toglobal. We do still want to make grammars and to understand language in globalterms, but such generalizations need to follow from what we can now see as the patternof language as it is actually used.
Źródło:
Yearbook of the Poznań Linguistic Meeting; 2018, 4, 1; 1-20
2449-7525
Pojawia się w:
Yearbook of the Poznań Linguistic Meeting
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Searching for Alternative Facts: Analyzing Scriptural Inference in Conservative News Practises
Autorzy:
Kaňuková, Nikola
Powiązania:
https://bibliotekanauki.pl/articles/1396941.pdf
Data publikacji:
2019
Wydawca:
Univerzita sv. Cyrila a Metoda. Fakulta masmediálnej komunikácie
Tematy:
Alternative Facts
Fake News
Christians
Conservatism
Republicans
Scriptural Inference
Opis:
In her report Francesca Tripodi analyses the attitudes and behaviour of individuals spread around the United States and who consider themselves as Christians, conservatives and Republicans. The conservatism in the account is characterised by several observed principles: an emphasized connection between faith and patriotism through repeated rituals like Christian prayer, the Pledge of Allegiance, and reciting the Virginia Republican Creed; the problem of separation of church and state and a need to protect racial and religious identity with subsidized defence strategies. In this ethnographic work, the author presents how two Republican groups are searching for the truth in the contemporary media environment. The author conducted several individuals who describe themselves as Christians, conservatives and Republicans and she analysed how they conceptualize truth. The findings of the work provide a new foundation for understanding the relationship between so-called „fake news“ and contemporary conservative political thought.
Źródło:
Media Literacy and Academic Research; 2019, 2, 1; 119-120
2585-8726
Pojawia się w:
Media Literacy and Academic Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The Dispute about the Future: Anthropocene and Sustainability as a Challenge
Autorzy:
Wulf, Christoph
Powiązania:
https://bibliotekanauki.pl/articles/1932009.pdf
Data publikacji:
2021-12-31
Wydawca:
Wydawnictwo Adam Marszałek
Tematy:
Anthropocene
sustainability
globalization
facts
truth
populism
grand narrative
utopia
Opis:
The upcoming transformations of today’s societies into sustainable societies pose numerous problems. To avoid the destruction of the foundations of life in the Anthropocene, a profound social and cultural transformation encompassing all areas of life is required. To know how this can be accomplished requires extensive research and knowledge, the reliability of which plays an important role. The more open and diverse the global world becomes, the more difficult it is to determine which facts are important and what consequences can be drawn from them for human action. Instead of a reflexive approach to the results of scientific research, today one often encounters a populist approach to science. Its results are used to support preconceived opinions. One is not interested in new findings but aims at the disparagement of people of other opinions and their hateful insult. A destructive division of society is the result of the debates that are so important for the future of humanity.
Źródło:
Kultura i Edukacja; 2021, 4(134); 13-24
1230-266X
Pojawia się w:
Kultura i Edukacja
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
FACTS location and size for reactive power system compensation through the multi-objective optimization
Autorzy:
Belazzoug, M.
Boudour, M.
Sebaa, K.
Powiązania:
https://bibliotekanauki.pl/articles/229744.pdf
Data publikacji:
2010
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
reactive dispatch
multi-objective optimization
NSGA-II
SVC
TCSC
FACTS
Opis:
The problem of the FACTS (Flexible Alternative Current Transmission System Devices) location and size for reactive power system compensation through the multi-objective optimization is presented in this paper. A new technique is proposed for the optimal setting, dimension and design of two kinds of FACTS namely: Static Volt Ampere reactive (VAR) Compensator (SVC) and Thyristor Controlled Series Compensator (TCSC) handling the minimization of transmission losses in electrical network. Using the proposed scheme, the type, the location and the rating of FACTS devices are optimized simultaneously. The problem to solve is multi criteria under constraints related to the load flow equations, the voltages, the transformer turn ratios, the active and reactive productions and the compensation devices. Its solution requires the the advanced algorithms to be applied. Thus, we propose an approach based on the evolutionary algorithms (EA) to solve multi-criterion problem. It is similar to the NSGA-II method (Ellitist Non Dominated Sorting Genetic Algorithm). The Pareto front is obtained for continuous, discrete and multiple of five MVArs (Mega Volt Ampere reactive) of compensator devices for the IEEE 57-bus test system (IEEE bus test is a standard network).
Źródło:
Archives of Control Sciences; 2010, 20, 4; 473-489
1230-2384
Pojawia się w:
Archives of Control Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
WAMS - based control of series FACTS devices installed in tie-lines of interconnected power system
Autorzy:
Nogal, Ł.
Machowski, J.
Powiązania:
https://bibliotekanauki.pl/articles/141396.pdf
Data publikacji:
2010
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
system elektroenergetyczny
stabilność
FACTS
WAMS
power system control
transient stability
Opis:
This paper addresses the state-variable stabilising control of the power system using such series FACTS devices as TCPAR installed in the tie-line connecting control areas in an interconnected power system. This stabilising control is activated in the transient state and is supplementary with respect to the main steady-state control designed for power flow regulation. Stabilising control laws, proposed in this paper, have been derived for a linear multi-machine system model using direct Lyapunov method with the aim to maximise the rate of energy dissipation during power swings and therefore maximisation their damping. The proposed control strategy is executed by a multi-loop controller with frequency deviations in all control areas used as the input signals. Validity of the proposed state-variable control has been confirmed by modal analysis and by computer simulation for a multi-machine test system.
Źródło:
Archives of Electrical Engineering; 2010, 59, 3-4; 121-140
1427-4221
2300-2506
Pojawia się w:
Archives of Electrical Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Wide-area based on coordinated tuning of fuzzy PSS and FACTS controller in multi-machine environment
Autorzy:
Ebrahimian, H.
Sheikhahmad, E. F.
Powiązania:
https://bibliotekanauki.pl/articles/102172.pdf
Data publikacji:
2016
Wydawca:
Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:
wide area power system
FPSS
FACTS
improved honey bee mating optimization
Opis:
In this paper coordination of fuzzy power system stabilizer (FPSS) and flexible ac transmission systems (FACTS) have been considered in a multi-machine power system. The proposed model, has been applied for a wide-area power system. The proposed FPSS presented with local, nonlinear feedbacks, and the corresponding control synthesis conditions are given in terms of solutions to a set of linear matrix inequalities (LMIs). For this model, in fuzzy control synthesis, the new proposed control design method is based on fewer fuzzy rules and less computational burden. Also, the parameters of FACTS controller have been evaluated by improved honey bee mating optimization (IHBMO). The effectiveness of the proposed method has been applied over two case studies of single-machine infinite-bus (SMIB) and two areas four machine (TAFM) Kundur’s power system. The obtained results demonstrate the superiority of proposed strategy.
Źródło:
Advances in Science and Technology. Research Journal; 2016, 10, 29; 85-96
2299-8624
Pojawia się w:
Advances in Science and Technology. Research Journal
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 39

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