Temat: power model - Katalog OPAC zbiorów

Skocz do pozycji: 1.

Tytuł:: A dynamic model as a tool for design and optimization of propulsion systems of transport means
Autorzy:: Peruń, Grzegorz
Powiązania:: https://bibliotekanauki.pl/articles/11542694.pdf
Data publikacji:: 2023
Wydawca:: Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:: dynamic model
gear design
power transmission system
model dynamiczny
konstukcja przekładni
układ napędowy
Opis:: Designing power transmission systems is a complex and often time-consuming problem. In this task, various computational tools make it possible to speed up the process and verify a great many different solutions before the final one is developed. It is widely possible today to conduct computer simulations of the operation of various devices before the first physical prototype is built. The article presents an example of a dynamic model of power transmission systems, which has been developed to support work aimed at designing new and optimizing existing systems of that type, as well as to help diagnose them by designing diagnostic algorithms sensitive to early stages of damage development. The paper also presents sample results of tests conducted with the model, used at the gear design stage. In the presented model, the main goal is to reproduce the phenomena occurring in gears as well as possible, using numerous experiments in this direction featured in the literature. Many already historical models present different ways of modeling, but they often made significant simplifications, required by the limitations of the nature of computational capabilities. Differences also result from the purpose of the models being developed, and the analysis of these different ways of doing things makes it possible to choose the most appropriate approach.
Źródło:: International Journal of Applied Mathematics and Computer Science; 2023, 33, 2; 183--195
1641-876X
2083-8492
Pojawia się w:: International Journal of Applied Mathematics and Computer Science
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: An efficient microgrid model based on Markov fuzzy demand-side management
Autorzy:: Jabash Samuel, G. K.
Sivagama Sundari, M. S.
Bhavani, R.
Jasmine Gnanamalar, A.
Powiązania:: https://bibliotekanauki.pl/articles/27311444.pdf
Data publikacji:: 2023
Wydawca:: Polska Akademia Nauk. Czasopisma i Monografie PAN
Tematy:: smart grid
fuzzy Markov decision process
power scheduling
operating cost
nonlinear model predictive control
inteligentna sieć
planowanie mocy
koszt operacyjny
proces decyzyjny Markowa rozmyty
regulator predykcyjny nieliniowego modelu
Opis:: Today’s electricity management mainly focuses on smart grid implementation for better power utilization. Supply-demand balancing, and high operating costs are still considered the most challenging factors in the smart grid. To overcome this drawback, a Markov fuzzy real-time demand-side manager (MARKOV FRDSM) is proposed to reduce the operating cost of the smart grid system and maintain a supply-demand balance in an uncertain environment. In addition, a non-linear model predictive controller (NMPC) is designed to give a global solution to the non-linear optimization problem with real-time requirements based on the uncertainties over the forecasted load demands and current load status. The proposed MARKOV FRDSM provides a faster scale power allocation concerning fuzzy optimization and deals with uncertainties and imprecision. The implemented results show the proposed MARKOV FRDSM model reduces the cost of operation of the microgrid by 1.95%, 1.16%, and 1.09% than the existing method such as differential evolution and real coded genetic algorithm and maintains the supply-demand balance in the microgrid.
Źródło:: Bulletin of the Polish Academy of Sciences. Technical Sciences; 2023, 71, 3; art. no. e145569
0239-7528
Pojawia się w:: Bulletin of the Polish Academy of Sciences. Technical Sciences
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 3.

Tytuł:: Model SaHo – polski model biznesowy dla energetyki jądrowej
SaHo Model – Polish business model for nuclear power
Autorzy:: Sawicki, Łukasz
Horbaczewska, Bożena
Powiązania:: https://bibliotekanauki.pl/articles/24201005.pdf
Data publikacji:: 2023
Wydawca:: Instytut Chemii i Techniki Jądrowej
Tematy:: energetyka jądrowa
model biznesowy
Model SaHo
finansowanie elektrowni jądrowej
nuclear energy
business model
financing of a nuclear power plant
Opis:: Celem niniejszego artykułu jest przedstawienie innowacyjnego modelu biznesowego, Modelu SaHo, stworzonego dla realizacji Programu Polskiej Energetyki Jądrowej (PPEJ), ale możliwego do zastosowania również w innych państwach oraz innych sektorach wymagających dużych nakładów inwestycyjnych. Model SaHo rozwiązuje problemy energetyki jądrowej związane z wysokim ryzykiem inwestycyjnym i wysokimi kosztami kapitału na etapie budowy oraz zapewnia elektrowni jądrowej przychody po podłączeniu jej do sieci. Model zakłada, że na początku inwestorem jest państwo, które przejmuje na siebie w krótkim okresie większość ryzyka. Następnie państwo sprzedaje akcje elektrowni przed podłączeniem jej do sieci, znacząco zmniejszając swoje zaangażowanie finansowe. Od tego momentu elektrownia w Modelu SaHo działa podobnie do elektrowni w fińskim modelu Mankala albo amerykańskiej spółdzielni energetycznej, wytwarzając i sprzedając energię swoim akcjonariuszom po koszcie produkcji. Żaden z modeli stosowanych do tej pory w sektorze jądrowym nie daje takich możliwości. Model SaHo umożliwia zwiększenie konkurencyjności krajowego przemysłu oraz zwiększenia akceptacji społecznej dla energetyki jądrowej. Dzięki temu jest on nie tylko modelem biznesowym, ale również koncepcją funkcjonowania przemysłu jądrowego.
The purpose of the paper is to present an innovative business model, the SaHo Model, designed specifically to enable the Polish government to implement Nuclear Power Development Plans, which can be possibly used in other countries and in sectors requiring high capital expenditures. The SaHo Model solves the problems identified in the nuclear energy sector, which are related to high investment risk and high costs of capital at the investment stage, and ensures revenues after connection to the grid. Since the state is the investor at the initial stages, it takes over most of the risk in the short term. Selling the shares before connection to the grid, the state significantly reduces the financial involvement in the long term. From then on, the SaHo Model works similar to the Finnish Mankala or American electric cooperative models, producing and selling energy to their shareholders at production costs. None of the models used so far in nuclear energy provides such opportunities. The SaHo Model allows to enhance the competitiveness of the national industry and to increase public acceptance for nuclear power. Thus, it is not only a business model but also a concept for the functioning of the nuclear industry.
Źródło:: Postępy Techniki Jądrowej; 2023, 3; 17--20
0551-6846
Pojawia się w:: Postępy Techniki Jądrowej
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 4.

Tytuł:: Photovoltaic power prediction based on improved grey wolf algorithm optimized back propagation
Autorzy:: He, Ping
Dong, Jie
Wu, Xiaopeng
Yun, Lei
Yang, Hua
Powiązania:: https://bibliotekanauki.pl/articles/27309934.pdf
Data publikacji:: 2023
Wydawca:: Polska Akademia Nauk. Czasopisma i Monografie PAN
Tematy:: BP neural network
photovoltaic power generation
PSO–GWO model
PSO–GWO–BP prediction model
particle swarm optimization
gray wolf optimization
back propagation
standard grey wolf algorithm
Opis:: At present, the back-propagation (BP) network algorithm widely used in the short-term output prediction of photovoltaic power stations has the disadvantage of ignoring meteorological factors and weather conditions in the input. The existing traditional BP prediction model lacks a variety of numerical optimization algorithms, such that the prediction error is large. The back-propagation (BP) neural network is easy to fall into local optimization thus reducing the prediction accuracy in photovoltaic power prediction. In order to solve this problem, an improved grey wolf optimization (GWO) algorithm is proposed to optimize the photovoltaic power prediction model of the BP neural network. So, an improved grey wolf optimization algorithm optimized BP neural network for a photovoltaic (PV) power prediction model is proposed. Dynamic weight strategy, tent mapping and particle swarm optimization (PSO) are introduced in the standard grey wolf optimization (GWO) to construct the PSO–GWO model. The relative error of the PSO–GWO–BP model predicted data is less than that of the BP model predicted data. The average relative error of PSO–GWO–BP and GWO–BP models is smaller, the average relative error of PSO–GWO–BP model is the smallest, and the prediction stability of the PSO–GWO–BP model is the best. The model stability and prediction accuracy of PSO–GWO–BP are better than those of GWO–BP and BP.
Źródło:: Archives of Electrical Engineering; 2023, 72, 3; 613--628
1427-4221
2300-2506
Pojawia się w:: Archives of Electrical Engineering
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 5.

Tytuł:: Technical and technological support of the technology of activatingthe process of gasification of thin coal seams
Autorzy:: Falshtynskyi, Volodymyr
Pererva, Andrii
Chalyi, Vladyslav
Psyuk, Vladyslav
Dychkovskyi, Roman
Powiązania:: https://bibliotekanauki.pl/articles/27324370.pdf
Data publikacji:: 2023
Wydawca:: Instytut Techniki Górniczej KOMAG
Tematy:: experimental bench plant
model of the gasification process
underground gas generator
reaction channel
fire break
low-power coalseams
reverse mode
gazyfikacja
kopalnie
wsparcie techniczne
Opis:: According to the tests results of the technology of reverse jet flow, tobalancethe geometric and physical parameters of the active zones of the reaction channel of the underground gas generator during the gasification of low-power coal seams. The parameters of activation of the oxidizing and reducing zones of the fire blowout were established, taking into account the outgassing of the coal seam in space and time, the impactof mining and geological parametersas well asgeotechnical and thermochemical processes, securing the evenadvance of the fire blowout along the length of the reaction channel of the underground gas generator. It was established that the intensification of the gasification process of thin and ultrafine coal seams increases the quantitative and qualitative parametersof exothermic and endothermic reactions, which have an impacton increasing the efficiency of the underground georeactor and determines the quality parametersof the gasification product.
Źródło:: Mining Machines; 2023, 41, 3; 186--199
2719-3306
Pojawia się w:: Mining Machines
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 6.

Tytuł:: Assessment of the stability of bev lhd loader
Autorzy:: Bołoz, Łukasz
Kozłowski, Artur
Horak, Wojciech
Powiązania:: https://bibliotekanauki.pl/articles/27315550.pdf
Data publikacji:: 2022
Wydawca:: STE GROUP
Tematy:: self-propelled mining machines
LHD loaders
machine stability
parametric modelling
dynamic simulations
mathematical model
battery power
Opis:: The article concerns the computational model for analysing the stability of the BEV LHD loader. Works were carried out to develop an innovative, light battery-powered loader, which was the subject of an R&D project implemented in cooperation with Bumech S. A. Compared to the existing solutions of loaders with similar load capacity, this one is distinguished by the use of an individual electric drive in each wheel and a replaceable battery. A physical and mathematical model was developed taking into account the specificity of the BEV LHD loader. In the model, the masses of the battery, individual drives, the platform and excavated material are taken into account separately. The developed model allows determining the loader wheel pressure on the floor, depending on the location of its components’ centres of gravity, the turning angle of the machine, the amount of excavated material in the bucket and the position of the bucket. The input parameters also include the longitudinal and transverse excavation slope angles. In addition, the model enables determining the inner and outer turning radius of the loader. To verify the theoretical model, dynamic simulation tests were carried out. The results of simulation analyses confirmed the correctness of the developed theoretical model. The model was used to prepare a calculation sheet for analysing the stability on the basis of the adopted parameters. In the article, selected results of the conducted stability analyses have been presented, along with the proposed parameters ensuring the loader’s stability. The developed theoretical model enables a quick assessment of the loader’s stability, which, due to a number of innovative solutions, differs from existing designs. The structure of the loader at the design stage is subject to numerous modifications, which affect the distribution of the centres of gravity of individual components. The developed model of the loader is a useful, parameterized tool that allows assessing the stability and the values of the turning radii of the machine.
Źródło:: Management Systems in Production Engineering; 2022, 4 (30); 377--387
2299-0461
Pojawia się w:: Management Systems in Production Engineering
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 7.

Tytuł:: Determination of hydrodynamic power losses in a gearing
Autorzy:: Stavytskyi, Valerii
Bashta, Oleksandr
Nosko, Pavlo
Tsybrii, Yurii
Powiązania:: https://bibliotekanauki.pl/articles/2106187.pdf
Data publikacji:: 2022
Wydawca:: Politechnika Białostocka. Oficyna Wydawnicza Politechniki Białostockiej
Tematy:: hydrodynamic power losses
gearing
tooth space
high speed gears
Coriolis force
mathematical model
Opis:: Despite the relatively numerous experimental studies, there are few published works on the topic of development of mathemati-cal models that describe the hydrodynamic processes in gears. There is no generic analytical model that integrates all types of losses. The purpose of this work is to develop a modern generalised methodology for calculating the hydrodynamic power losses of high-speed gears. For each gear, partially or fully immersed into an oil bath, the power spent to overcome the hydromechanical resistance can be represented as the sum of the following: the Coriolis force moment arising from the radial movement of the oil in the tooth spaces of the rotating gear, the viscous friction forces moment on the periphery of the gear addendums in the oil bath and the viscous friction forces moment at the face of the gear in the oil bath. The hydrodynamic power losses due to the Coriolis force action, viscosity friction losses at the periphery of the gear and the viscosity friction at the face of the gear (both turbulent and laminar modes) were observed separately. From the mathematical simulation of the rotation processes when the gear is immersed into the oil bath, an analytical dependence was obtained. It allows predicting the influence of the geometrical parameters of the gearing on the hydrodynamic power losses. Analysis of the calculation results of the power losses due to the action of hydraulic resistance forces and results from experimental studies is provided for several gears with different hydromechanical parameters. The proposed method of calculating power loss due to hydromechanical resistance of the oil bath to the rotation of the gear gave results that were close to the experimental data. Acceptable coincidence of theoretical and experimental results allows recommending the received analytical dependencies for practical calculations of high-speed gears.
Źródło:: Acta Mechanica et Automatica; 2022, 16, 1; 1--7
1898-4088
2300-5319
Pojawia się w:: Acta Mechanica et Automatica
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 8.

Tytuł:: Determination of the current-voltage characteristics of the photovoltaic cells using the CoachLabII+ measuring console
Wyznaczanie charakterystyk prądowo-napięciowych ogniw fotowoltaicznych z wykorzystaniem konsoli pomiarowej coachlabii+
Autorzy:: Różański, Stanisław Andrzej
Powiązania:: https://bibliotekanauki.pl/articles/2200277.pdf
Data publikacji:: 2022
Wydawca:: Uniwersytet Technologiczno-Humanistyczny im. Kazimierza Pułaskiego w Radomiu
Tematy:: CoachLabII+ console
current-voltage characteristics
maximum power
one-diode model
photovoltaic cell
charakterystyka prądowo-napięciowa
konsola CoachLabII+
moc maksymalna
model jednodiodowy
ogniwo PV
Opis:: The Coach6 software and the CoachLabII+ measuring console coupled with a computer and equipped with appropriate voltage and current sensors were used to determine the current-voltage and power-voltage characteristics of the photovoltaic cells. The current-voltage and power-voltage characteristics for a single cell and cells connected in series and in parallel were tested depending on the light intensity. Using a simplified theoretical model of a photovoltaic cell based on the one-diode equivalent circuit and Shockley diode equation, the ideality factor, diode saturation current and source current were determined, fitting the appropriate theoretical relationship to the measurement results. Based on the current-voltage and power-voltage characteristics, the short-circuit current, open circuit voltage, maximum power, fill factor, conversion efficiency and load resistance were determined. The dependence of the determined parameters on the light intensity was discussed.
Do wyznaczenia charakterystyk prądowo-napięciowych oraz mocowo-napięciowych ogniw fotowoltaicznych wykorzystano oprogramowanie Coach6 oraz konsolę pomiarową CoachLabII+ sprzężoną z komputerem i wyposażoną w odpowiednie czujniki napięcia i prądu. Charakterystyki prądowo-napięciowe dla pojedynczego ogniwa oraz ogniw połączonych szeregowo i równolegle badano w zależności od natężenia światła. Wykorzystując uproszczony model teoretyczny ogniwa fotowoltaicznego bazujący na pojedynczej diodzie oraz wzorze Shockley'a dla prądu diody półprzewodnikowej wyznaczono współczynnik korekcji, prąd wsteczny oraz prąd źródła, dopasowując odpowiednie zależności teoretyczne do wyników pomiarów. Na podstawie charakterystyk prądowo-napięciowych oraz mocowo-napięciowych wyznaczono prąd zwarcia, napięcie obwodu otwartego, moc maksymalną, współczynnik wypełnienia, sprawność konwersji ogniwa oraz rezystancję obciążenia. Zaobserwowano zależność wyznaczonych parametrów od natężenia światła.
Źródło:: Journal of Automation, Electronics and Electrical Engineering; 2022, 4, 2; 31--38
2658-2058
2719-2954
Pojawia się w:: Journal of Automation, Electronics and Electrical Engineering
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 9.

Tytuł:: Dynamic rating method of traction network based on wind speed prediction
Autorzy:: Su, Zhaoux
Tian, Mingxing
Sun, Lijun
Zhang, Ruopeng
Powiązania:: https://bibliotekanauki.pl/articles/2086724.pdf
Data publikacji:: 2022
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: dynamic thermal rating
IEEE-738
short-term emergency dispatch
time series model
traction power supply
wind speed prediction
Opis:: The operating temperature of the transmission line in the traction network is affected by geographical and climatic factors, especially the wind speed. To make better use of the thermal stability transmission capacity of the traction power supply system in improving the short-term emergency transmission capacity, the dynamic rating technology is introduced into the traction power supply system. According to the time-varying characteristics of the actual wind speed, a dynamic rating method of the traction network based on wind speed prediction is proposed and constructed. Based on the time series model in predicting the wind speed series along the corridor of the traction network, the temperature curve of each transmission line under different currents is calculated by combining it with the heat balance equation of an IEEE-738 capacity expansion model, thus the relationship between the peak operating temperature and current of each transmission line in the prediction period is obtained. According to the current distribution coefficient, the capacity increase limit of the traction network is determined. The example shows that the proposed dynamic rating method based on wind speed prediction is an effective method to predict the short-term safe capacity increase limit of the traction network, which can increase the comprehensive capacity of the traction network by about 45% in the next six hours, and the capacity increase effect is obvious, which can provide reference and technical support for short-term emergency dispatching of traction power supply dispatching centres.
Źródło:: Archives of Electrical Engineering; 2022, 71, 2; 379--395
1427-4221
2300-2506
Pojawia się w:: Archives of Electrical Engineering
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 10.

Tytuł:: Estimation of states economic position on the example of Nigeria
Ocena pozycji ekonomicznej państw na przykładzie Nigerii
Autorzy:: Obojska, Lidia
Kiczma, Łukasz
Powiązania:: https://bibliotekanauki.pl/articles/21150887.pdf
Data publikacji:: 2022
Wydawca:: Polskie Towarzystwo Geopolityczne
Tematy:: economic position
economic power
Sułek's model
formal analysis
neural networks
economic rankings
Nigeria
pozycja gospodarcza
siła gospodarcza
model Sułka
analiza formalna
sieci neuronowe
rankingi gospodarcze
Opis:: The scope of this manuscript is to propose a method of estimation of state's economic position. To evaluate an economic position, we apply formal analysis on Sułek's model of economic power, and analyze its factors. We evaluate whether the variables taken in a formal model are independent or not. In case they are strongly correlated, we split them or, if it is not possible, we create new factors which puts together correlated units. We apply various methods of predictions of economic power; in particular neural networks which do not require the normal distribution of errors. Finally, we estimate the state's economic position on the basis of formal analysis, predictions, and in comparison to selected economic rankings. All the results are figured out for Nigeria.
Celem niniejszego artykułu jest opracowanie metodyki szacowania pozycji ekonomicznej państwa. Do oceny pozycji ekonomicznej zastosowano analizę formalną w oparciu o model siły ekonomicznej Sułka i dokonano analizy jej czynników. Oceniono stopień niezależności zmiennych uwzględnionych w modelu formalnym. W przypadku gdy są one silnie skorelowane, rozdzielono je lub, jeśli nie było to możliwe, utworzono nowe czynniki, które łączą skorelowane jednostki. Zastosowano różne metody predykcji siły ekonomicznej, w szczególności oparte na sieciach neuronowych, które nie wymagają normalnego rozkładu błędów. Na koniec oszacowano pozycję gospodarczą państwa na podstawie analizy formalnej, prognoz oraz w porównaniu z wybranymi rankingami gospodarczymi. Wszystkie wyniki opracowano dla Nigerii.
Źródło:: Przegląd Geopolityczny; 2022, 40; 84-102
2080-8836
2392-067X
Pojawia się w:: Przegląd Geopolityczny
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 11.

Tytuł:: Improvement of the accuracy of Hogg and Fuerstenaus model in predicting the power draw of ball mills based on determining the grinding media’s dynamic voidage
Autorzy:: Golpayegani, Mohammad Hasan
Rezai, Bahram
Powiązania:: https://bibliotekanauki.pl/articles/2175427.pdf
Data publikacji:: 2022
Wydawca:: Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:: voidage
grinding media
ball mill
Hogg model
Fuerstenau's model
power draw
Opis:: In the development of tumbling mills' power models, the voidage of grinding media is assumed to be static and equal to 40%. While the grinding media’s voidage is dynamic; and hence is varied by changing the operating parameters. In this paper, to improve the Hogg and Fuerstenau model's accuracy in predicting the ball mills' power draw, the grinding media's static and dynamic voidage was studied for Bond's proposed ball size distributions (BSD) for the ball mills' first filling. To this end, by scaling down balls to one-tenth of actual size, developing a novel method to measure the dynamic voidage, and employing the three-level factorial method, a separate empirical model was developed for determining the dynamic voidage of each Bond's BSD with respect to mill's fractional filling and rotating speed. Moreover, using the multiple regression method, a general empirical model was derived to determine the dynamic voidage of each supposed BSD based on calculating the mean absolute deviation of balls diameter (MAD). Results indicated that grinding media's dynamic voidage increases with an increase in rotating speed and a decrease in fractional filling and balls diameter's MAD. The maximum and minimum static and dynamic voidage occurred for the seventh and first Bond's BSDs. By employing an industrial database and analyzing the mean absolute percentage error (MAPE) of predicted ball mills' power draw, it was found that the Hogg and Fuerstenau model's accuracy enhances by calculating the load's bulk density based on the grinding media's dynamic voidage.
Źródło:: Physicochemical Problems of Mineral Processing; 2022, 58, 6; art. no. 153380
1643-1049
2084-4735
Pojawia się w:: Physicochemical Problems of Mineral Processing
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 12.

Tytuł:: Kształtowanie modelu władzy w Polsce po 1989 roku na przykładzie powoływania Rady Ministrów – od gabinetu Tadeusza Mazowieckiego do gabinetu Hanny Suchockiej
Shaping the model of power in the Republic of Poland after 1989 on the example of the appointment of the Council of Ministers in Poland – from the office of Tadeusz Mazowiecki to the office of Hanna Suchocka
Autorzy:: Świergiel, Rafał
Powiązania:: https://bibliotekanauki.pl/articles/30097928.pdf
Data publikacji:: 2022
Wydawca:: Uniwersytet Komisji Edukacji Narodowej w Krakowie
Tematy:: procedura powoływania Rady Ministrów w Polsce w latach 1989–1992
kształtowanie modelu władzy w Rzeczypospolitej Polskiej po 1989 r.
praktyka konstytucyjna w Polsce po 1989 r.
procedure for appointing the Council of Ministers in Poland in 1989–1992
shaping the model of power in the Republic of Poland after 1989
constitutional practice in Poland after 1989
Opis:: W artykule autor omawia procedurę powoływania Rady Ministrów w Polsce po 1989 r., analizując okres 1989–1992. Rozważania rozpoczyna powołaniem pierwszego niekomunistycznego rządu T. Mazowieckiego, a kończy gabinetem H. Suchockiej. Autor analizuje powiązane z nimi przepisy prawne, jednocześnie opisuje kontekst polityczno-społeczny. Zdaniem autora we wszystkich opisanych przypadkach istotny był kontekst polityczny, a dzięki ogólności przepisów udało się wypracować optymalne rozwiązania. Doświadczenia te stały się podstawą dalszych prac nad konstytucją.
In the article, the author discusses the procedure for appointing the Council of Ministers in Poland after 1989. It examines the period 1989–1992. He begins his deliberations with the appointment of the first non‑ communist government of T. Mazowiecki, and ends with the cabinet of H. Suchocka. The author analyzes the related legal provisions and at the same time describes the political and social context. In the author’s opinion, in all the described cases the political context was important and due to the general nature of the regulations, it was possible to develop optimal solutions. These experiences were the foundation for further work on the constitution.
Źródło:: Annales Universitatis Paedagogicae Cracoviensis. Studia Politologica; 2022, 29, 371; 27-40
2081-3333
Pojawia się w:: Annales Universitatis Paedagogicae Cracoviensis. Studia Politologica
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 13.

Tytuł:: Model predictive direct power control of energy storage quasi-Z-source grid-connected inverter
Autorzy:: Tang, Min'an
Yang, Shangmei
Zhang, Kaiyue
Wang, Qianqian
Liu, Chenggang
Dong, Xuewang
Powiązania:: https://bibliotekanauki.pl/articles/2042769.pdf
Data publikacji:: 2022
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: quasi Z-Source
inverter
energy storage
power control
model predictive
space vector
Opis:: In order to overcome the shortcoming of large switching losses caused by variable switching frequency appears in the conventional finite control set model predictive control (FCS-MPC) algorithm, a model predictive direct power control (MP-DPC) for an energy storage quasi-Z-source inverter (ES-qZSI) is proposed. Firstly, the power prediction model of the ES-qZSI is established based on the instantaneous power theory. Then the average voltage vector in the coordinate system is optimized by the power cost function. Finally, the average voltage vector is used as the modulation signal, and the corresponding switching signal with fixed frequency is generated by the shoot-through segment space vector pulse width modulation (SVPWM) technology. The simulation results show that the ES-qZSI realizes six shoot-through actions per control cycle and achieves the constant frequency control of the system, which verifies the correctness of the proposed control strategy.
Źródło:: Archives of Electrical Engineering; 2022, 71, 1; 21-35
1427-4221
2300-2506
Pojawia się w:: Archives of Electrical Engineering
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 14.

Tytuł:: Reliability assessment of the port power system based on integrated energy hybrid system
Autorzy:: Fang, Liang
Xu, Xiao-Yan
Xia, Jun
Tarasiuk, Tomasz
Powiązania:: https://bibliotekanauki.pl/articles/2173637.pdf
Data publikacji:: 2022
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: Markov model
distributed generation
reliability assessment
integrated energy
distribution power system
model Markowa
generacja rozproszona
ocena wiarygodności
energia zintegrowana
system zasilania dystrybucyjny
Opis:: The conventional port distribution power system is being disrupted by increasing distributed generation (DG) levels based on integrated energy. Different new energy resources combine with conventional generation and energy storage to improve the reliability of the systems. Reliability assessment is one of the key indicators to measure the impact of the distributed generation units based on integrated energy. In this work, an analytical method to investigate the impacts of using solar, wind, energy storage system (ESS), combined cooling, heating and power (CCHP) system and commercial power on the reliability of the port distribution power system is improved, where the stochastic characteristics models of the major components of the new energy DG resources are based on Markov chain for assessment. The improved method is implemented on the IEEE 34 Node Test Feeder distribution power system to establish that new energy resources can be utilized to improve the reliability of the power system. The results obtained from the case studies have demonstrated efficient and robust performance. Moreover, the impacts of integrating DG units into the conventional port power system at proper locations and with appropriate capacities are analyzed in detail.
Źródło:: Bulletin of the Polish Academy of Sciences. Technical Sciences; 2022, 70, 2; art. no. e140372
0239-7528
Pojawia się w:: Bulletin of the Polish Academy of Sciences. Technical Sciences
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 15.

Tytuł:: The use of dynamic modeling for optimization of machine design on the example of a toothed gear
Autorzy:: Peruń, Grzegorz
Powiązania:: https://bibliotekanauki.pl/articles/24201975.pdf
Data publikacji:: 2022
Wydawca:: Politechnika Poznańska. Instytut Mechaniki Stosowanej
Tematy:: dynamic model
toothed gear
power transmission system
transport
model dynamiczny
przekładnia zębata
układ napędowy
Opis:: The paper presents a dynamic model of a test stand with gears operating in a circulating power system as an example of the possibility of using dynamic modeling to optimize the gear construction. The presented model is one of two advanced tools developed within the research conducted for the optimization and diagnosis of various types of gear transmission systems. Both of them were based on the assumption that simulations of system operation at variable loads and rotational speeds could be carried out and that an advanced description of gear tooth interaction could be included. The developed models, after their tuning to real objects, were used as tools for generating vibration signals for various technical states of gears. This allowed determining the influence of various constructional, technological, and operational factors on the vibroactivity of a toothed gear, which is undoubtedly helpful for designers both during the construction of new toothed gears, as well as optimization of the existing ones.
Źródło:: Vibrations in Physical Systems; 2022, 33, 3; art. no. 2022322
0860-6897
Pojawia się w:: Vibrations in Physical Systems
Dostawca treści:: Biblioteka Nauki

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