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Tytuł:
3D loss and heat analysis at the end region of 4-poles 1150 MW nuclear power turbine generator
Autorzy:
Zhou, G.
Han, L.
Fan, Z
Liao, Y.
Huang, S.
Powiązania:
https://bibliotekanauki.pl/articles/950663.pdf
Data publikacji:
2014
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
loss and heat
end region
4-poles nuclear power turbine generator
electromagnetic field
temperature field
Opis:
To study the principle of loss and heat at the end region of large 4-poles nuclear power turbine generator, 3D transient electromagnetic field and 3D steady temperature field finite element (FE) models of the end region are established respectively. Considering the factors such as rotor motion, core non-linearity and time-varying of electromagnetic field, the anisotropic heat conductivity and different heat dissipation conditions of stator end region, a 50 Hz, 1150 MW, 4-poles nuclear power turbine generator is investigated. The loss and heat at the generator end region are calculated respectively at no-load and rated-load, and the calculation results are compared with the test data. The result shows that the calculation model is accurate and the generator design is suitable. The method is valuable for the research of loss and heat at the end region of large 4-poles nuclear power turbine generator and the improvement of the generator’s operation stability. The method has been applied successfully for the design of the larger nuclear power turbine generators.
Źródło:
Archives of Electrical Engineering; 2014, 63, 1; 47-61
1427-4221
2300-2506
Pojawia się w:
Archives of Electrical Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Efficiency comparison between the LLCL and LCL-filters based single-phase grid-tied inverters
Autorzy:
Wu, W.
Huang, M.
Blaabjerg, F.
Powiązania:
https://bibliotekanauki.pl/articles/140537.pdf
Data publikacji:
2014
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
LCL filter
LLCL-filter
efficiency power loss
modulation
single-phase grid-tied inverter
Opis:
An LLCL-filter is becoming more attractive than an LCL-filter as the interface between the grid-tied inverter and the grid due to possibility of reducing the copper and the magnetic materials. The efficiency of the LLCL-filter based single-phase grid-tied inverter also excites interests for many applications. The operation of the switches of the VSI is various with different modulation methods, which lead to different efficiencies for such a single-phase grid-tied inverter system, and therefore important research has been carried out on the effect of the choice of PWM schemes. Then power losses and efficiencies of the LLCL-filter and the LCL-filter based single-phase grid-tied inverters are analyzed and compared under the discontinuous unipolar, the dual-buck and the bipolar modulations. Results show that the efficiency of LLCL-filter based inverter system is higher than the LCL- filter based independent on the modulation method adopted. Experiments on a 2 kW prototype are in good agreement with results of the theoretical analysis.
Źródło:
Archives of Electrical Engineering; 2014, 63, 1; 63-79
1427-4221
2300-2506
Pojawia się w:
Archives of Electrical Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The impact of the damper blade position on the generated noise and pressure losses in plenum box with swirl diffusers
Autorzy:
Wójciak, Kamil
Gaj, Patryk
Kopania, Joanna
Bogusławski, Grzegorz
Powiązania:
https://bibliotekanauki.pl/articles/127800.pdf
Data publikacji:
2019
Wydawca:
Politechnika Poznańska. Instytut Mechaniki Stosowanej
Tematy:
HVAC
noise emission
sound power level
pressure loss
optimization
emisja hałasu
poziom mocy akustycznej
strata ciśnienia
optymalizacja
Opis:
The article presents the effect of setting the throttle in the plenum box with swirl diffuser on the generated noise and the pressure losses. The sound power levels of the source was determined using the precision method in the reverberation room in accordance with the PN-EN ISO 3741:2011 standard. The examination was carried out for damper blade position set vertically and horizontally for full opening and at a 45 degree angle in both directions. In order to confirm the universality of the conducted experiment, the tests were carried out for two different face swirl diffuser with different shapes of air control blades and holes in the plate and for different flow rates. The multi-criteria optimization methods were used to select the best throttle position.
Źródło:
Vibrations in Physical Systems; 2019, 30, 1; 1-8
0860-6897
Pojawia się w:
Vibrations in Physical Systems
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Loadability maximisation in bilateral network for real-time forecasting system using cuckoo search algorithm
Autorzy:
Venkatasivanagaraju, S.
Rao, M. Venkateswara
Powiązania:
https://bibliotekanauki.pl/articles/38699704.pdf
Data publikacji:
2023
Wydawca:
Instytut Podstawowych Problemów Techniki PAN
Tematy:
optimal power flow
NR method
short-term load forecasting
long-term load forecasting
cuckoo search algorithm
optimisation
loss minimisation
optymalny przepływ mocy
metoda NR
krótkoterminowe prognozowanie obciążeń
długoterminowe prognozowanie obciążeń
algorytm kukułki
optymalizacja
minimalizacja strat
Opis:
This manuscript proposes an optimal power flow (OPF) solution in a coordinated bilateralpower network. The primary goal of this project is to maximise the benefits of the powermarket using Newton–Raphson (NR) and cuckoo search algorithm CSA methodologies.The global solution is found using a CSA-based optimisation approach. The study isconducted on real-time bus system. To avoid this, creative techniques have lately beenused to handle the OPF problem, such as loadability maximisation for real-time predictionsystems employing the CSA. In this work, cuckoo search (CS) is used to optimise theobtained parameters that help to minimise parameters in the predecessor and consequentunits of each sub-model. The proposed approach is used to estimate the power load in thelocal area. The constructed models show excellent predicting performance based on derivedperformance. The results confirm the method’s validity. The outcomes are compared withthose obtained by using the NR method. CSA outperformed the other methods in thisinvestigation and gave more accurate predictions. The OPF problem is solved via CSAin this study. Implementing a real-time data case bus system is recommended to test theperformance of the established method in the MATLAB programme.
Źródło:
Computer Assisted Methods in Engineering and Science; 2023, 30, 1; 73-88
2299-3649
Pojawia się w:
Computer Assisted Methods in Engineering and Science
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Analiza wpływu wybranych odnawialnych źródeł energii na straty mocy czynnej i biernej w systemie elektroenergetycznym
Impact of the selected renewable energy sources on active and reactive power losses in a power system
Autorzy:
Tarakan, B.
Tarakan, K.
Zajczyk, R.
Czapp, S.
Sarnicki, M.
Powiązania:
https://bibliotekanauki.pl/articles/266608.pdf
Data publikacji:
2016
Wydawca:
Politechnika Gdańska. Wydział Elektrotechniki i Automatyki
Tematy:
odnawialne źródła energii
OZE
farma fotowoltaiczna
farmy wiatrowe
straty mocy czynnej
straty mocy biernej
renewable energy sources
photovoltaic farm
wind farms
loss of active power
loss of reactive power
Opis:
Moc zainstalowana oraz produkcja energii elektrycznej z odnawialnych źródeł energii od kilkunastu lat systematycznie w Polsce wzrasta. Należy spodziewać się, że tendencja ta w najbliższych latach zostanie utrzymana. Dość dużym zainteresowaniem cieszą się źródła wiatrowe oraz źródła fotowoltaiczne, co sprawia, że przy znacznych ich mocach zainstalowanych konieczne staje się badanie wpływu tych źródeł na system elektroenergetyczny. W artykule przedstawiono analizę wpływu farmy fotowoltaicznej i farmy wiatrowej na poziom strat mocy czynnej i biernej w systemie elektroenergetycznym. Obliczenia wykonano z wykorzystaniem programu DIgSILENT PowerFactory.
The rated power and the production of energy from renewable energy sources for several years steadily increases in Poland. It is expected that this trend will be continued in the coming years. Wind and photovoltaic sources are very popular and in consequence it becomes necessary to study the impact of these sources on the power system. The article presents an analysis of the impact of photovoltaic farm and wind farm on the level of loss of active and reactive power in the power system. Calculations were performed with the use of DIgSILENT PowerFactory software.
Źródło:
Zeszyty Naukowe Wydziału Elektrotechniki i Automatyki Politechniki Gdańskiej; 2016, 51; 27-30
1425-5766
2353-1290
Pojawia się w:
Zeszyty Naukowe Wydziału Elektrotechniki i Automatyki Politechniki Gdańskiej
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Modeling of sound power transmission within duct systems
Autorzy:
Strek, Tomasz
Powiązania:
https://bibliotekanauki.pl/articles/2146600.pdf
Data publikacji:
2020
Wydawca:
Politechnika Poznańska. Instytut Mechaniki Stosowanej
Tematy:
transmission loss
finite element method
dimensionless acoustic equations
sound power
izolacyjność akustyczna
metoda elementów skończonych
moc akustyczna
Opis:
External boundaries of acoustic devices can channel sound propagation, and in some cases can create buildup or attenuation of acoustic energy within a confined space. In this paper, it is proposed an efficient practical numerical method (based on FEM) of calculation of attenuation of sound power transmission through ducts. The method shows its viability by presenting the reasonably consistent anticipation of the experimental result. One can observe the mechanical behaviour of the duct’s medium for lower frequencies (high transmission loss) and wave behaviour for higher frequencies (small or zero attenuation). The authors proved that mechanical vibrations of medium reduce the possibility of acoustic energy transmission in duct systems. The radiation impedance for the duct is calculated as well.
Źródło:
Vibrations in Physical Systems; 2020, 31, 3; art. no. 2020320
0860-6897
Pojawia się w:
Vibrations in Physical Systems
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Prediction of helicopter H-V zone and cueing the emergency maneuver after power loss
Przewidywanie stref H-V śmigłowca i manewru awaryjnego po utracie mocy napędu
Autorzy:
Stanisławski, J.
Powiązania:
https://bibliotekanauki.pl/articles/140256.pdf
Data publikacji:
2010
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
śmigłowiec
helikopter
utrata mocy napędu
strefa H-V
helicopter
power loss
H-V zone
Opis:
The paper presents the results of simulation method for prediction of helicopter H-V zone envelope, in the case of engine power loss. Depending on the loss rate of available power, the emergency maneuver for flight continuation is calculated, or the autorotation landing is predicted. The realization of an airborne device with in-built calculating procedure and graphic presentation of H-V zone predicted limits can improve safety level of helicopter flight, and can cue the pilot to make proper decision in emergency conditions. The results of emergency meneuver simulation were verified by comparing them with flight tests of Mi-2Plus helicopter for partial power unit failure, and with records of SW-4 helicopter autorotation landing. The operation of measurement-recording module, which consists of GPS receiver, inertial measurement unit and a computer of PC-104 standard, was checked during flight tests of a radio-controlled helicopter model.
Przedstawiono wyniki symulacyjnego przewidywania granic stref H-V dla śmigłowca w przypadku utraty mocy napędu. W zależności od stopnia spadku mocy wyznaczana jest możliwość manewru kontynuacji lotu lub przewidywane jest lądowanie autorotacyjne. Pokładowe urządzenie z wprowadzoną procedurą obliczeniową oraz graficzną prezentacją granic stref H-V może zwiększyć bezpieczeństwo lotów śmigłowca. Wyniki obliczeń symulacyjnych weryfikowano porównując z zapisami z badań w locie śmigłowców Mi-2Plus i SW-4. Pracę modułu pomiarowego obejmującego odbiornik GPS i komputer standardu PC-104 testowano przy wykorzystaniu sterowanego modelu śmigłowca.
Źródło:
Archive of Mechanical Engineering; 2010, LVII, 1; 21-44
0004-0738
Pojawia się w:
Archive of Mechanical Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Economic based evaluation of DGs in capacitor allocated optimal distribution network
Autorzy:
Srinivasan, G.
Amaresh, K.
Cheepati, Kumar Reddy
Powiązania:
https://bibliotekanauki.pl/articles/2173535.pdf
Data publikacji:
2022
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
ISSOT-WF
capacitor placement
capacitor sizing
feeder reconfiguration
dispersed generation
electrical distribution network
additional power loss reduction
rozmieszczenie kondensatorów
wymiarowanie kondensatorów
rekonfiguracja podajnika
generacja rozproszona
sieć dystrybucji energii
redukcja strat mocy
Opis:
Feeder reconfiguration (FR), capacitor placement and sizing (CPS) are the two renowned methods widely applied by the researchers for loss minimization with node voltage enrichment in the electrical distribution network (EDN), which has an immense impact on economic savings. In recent years, optimization of FR and CPS together can proficiently yield better power loss minimization and save costs compared to the individual optimization of FR and CPS. This work proposes an application of an improved salp swarm optimization technique based on weight factor (ISSOT-WF) to solve the cost-based objective function using CPS with and without FR for five different cases and three load levels, subject to satisfying operating constraints. In addition, to ascertain the impact of real power injection on additional power loss reduction, this work considers the integration of dispersed generation units at three optimal locations in capacitive compensated optimal EDN. The effectiveness of ISSOT-WF has been demonstrated on the standard PG&E-69 bus system and the outcomes of the 69-bus test case have been validated by comparing with other competing algorithms. Using FR and CPS at three optimal nodes and due to power loss reduction, cost-saving reached up to a maximum of 71%, and a maximum APLR of 26% was achieved after the installation of DGs at three optimal locations with the significant improvement in the bus voltage profile.
Źródło:
Bulletin of the Polish Academy of Sciences. Technical Sciences; 2022, 70, 1; e139053, 1--10
0239-7528
Pojawia się w:
Bulletin of the Polish Academy of Sciences. Technical Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A hybridized approach for design and optimization of ORPD under unbalanced conditions
Autorzy:
Shareef, S. M.
Rao, R. S.
Powiązania:
https://bibliotekanauki.pl/articles/1839102.pdf
Data publikacji:
2018
Wydawca:
Polska Akademia Nauk. Instytut Badań Systemowych PAN
Tematy:
ORPD
power loss
voltage profile
Cuckoo Search
Glow Worm Swarm
Opis:
The issue of ORPD (Optimal Reactive Power Dispatch) for enhancing security and economy of a power system has been given substantial consideration in recent days. The major inspiration behind deploying an ORPD system for enhancing power system efficiency is to reallocate the RP (reactive power) in such a manner that power loss be minimized, and voltage profiles get enhanced. Hence, this paper concerns the major objectives, namely, reduction of power loss and voltage deviation that are related to solving ORPD problem under unbalanced condition. To attain these objectives, an amalgamation of two algorithms, called CS (Cuckoo Search) and GWSO (Glow Worm Swarm), is adopted for optimizing, and hence the proposed model is referred to as CP-GWSO. This algorithm functions with the control parameters, namely load reactance, voltage and transformer tap settings that are tuned to attain the optimum outcome. The entire empirical part of the investigations is performed on two IEEE standard test bus systems, the IEEE 14 and the IEEE 39 bus systems. Finally, the proposed scheme is compared to the conventional methods, and its efficiency is confirmed.
Źródło:
Control and Cybernetics; 2018, 47, 4; 309-328
0324-8569
Pojawia się w:
Control and Cybernetics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Impact voltage deviation on the technological characteristics of crushers
Autorzy:
Savchenko, V.
Sinyavsky, A.
Powiązania:
https://bibliotekanauki.pl/articles/410666.pdf
Data publikacji:
2013
Wydawca:
Polska Akademia Nauk. Oddział w Lublinie PAN
Tematy:
crusher
electric drive
voltage deviation
productivity
specific consumption of energy
power loss
grinding module
Opis:
The results of research on the influence of voltage deviation on the technological characteristics and energy losses in electric drive of the crusher are presented. Dependence of the productivity, of specific consumption of energy and grinding module on the voltage are established.
Źródło:
ECONTECHMOD : An International Quarterly Journal on Economics of Technology and Modelling Processes; 2013, 2, 2; 37-40
2084-5715
Pojawia się w:
ECONTECHMOD : An International Quarterly Journal on Economics of Technology and Modelling Processes
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Distributed generation’s integration planning involving growth load models by means of genetic algorithm
Autorzy:
Rahman, Y. A.
Manjang, S.
Yusran, A.
Ilham, A.
Powiązania:
https://bibliotekanauki.pl/articles/141167.pdf
Data publikacji:
2018
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
distributed generation
genetic algorithm
load models
power loss
load growth
Opis:
The growth in the system load accompanied by an increase of power loss in the distribution system. Distributed generation (DG) is an important identity in the electric power sector that substantially overcomes power loss and voltage drop problems when it is coordinated with a location and size properly. In this study, the DG integration into the network is optimally distributed by considering the load conditions in different load models used to surmount the impact of load growth. There are five load models tested namely constant, residential, industrial, commercial and mixed loads. The growth of the electrical load is modeled for the base year up to the fifth year as a short-term plan. Minimization of system power loss is taken as the main objective function considering voltage limits. Determination of the location and size of DG is optimally done by using the breeder genetic algorithm (BGA). The proposed studies were applied to the IEEE 30 radial distribution system with single and multiple placement DG scenarios. The results indicated that installing an optimal location and size DG could have a strong potential to reduce power loss and to secure future energy demand of load models. Also, commercial load requires the largest DG active injection power to maintain the voltage value within tolerable limits up to five years.
Źródło:
Archives of Electrical Engineering; 2018, 67, 3; 667--682
1427-4221
2300-2506
Pojawia się w:
Archives of Electrical Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Research and Solution Proposals to Optimize Distribution Power Grids in Smart Grid Condition
Autorzy:
Pham, Trung Son
Nguyen, Dinh Tien
Nguyen, Quang Thuan
Dang, Quang Khoa
Powiązania:
https://bibliotekanauki.pl/articles/2020237.pdf
Data publikacji:
2021
Wydawca:
Polskie Towarzystwo Przeróbki Kopalin
Tematy:
smart grid
power loss
energy loss
optimization
distribution power grids
strata energii
optymizacja
dystrybucja
Opis:
Smart Grid is a concept for transforming the electric power grid by using advanced automatic control and communications techniques and other forms of information technology. It integrates innovative tools and technologies from: generation, transmission and distribution. This also includes consumer appliances and equipment. This concept integrates energy infrastructure, processes, devices, information and markets into a coordinated and collaborative process. All allowing energy to be generated, distributed and consumed flexibly and efficiently. However, the Smart Grid with the integration of distributed generation itself also creates a several disadvantages. There can be problems with: stability and reliability, relay protection, isolation and operational isolation in which the problem is to create a burden on the distribution grid when transmitting electrical energy sources. Optimizing power flow and bringing high operating efficiency on Smart Grid conditions is an urgent issue. This paper focuses on researching and proposing solutions for optimal calculation of power flow on Smart Grid. The paper has researched, and analyzed calculation solutions to optimize power flow and proposed to use the Lagrange multiplier method. The study performed calculations for a typical Smart Grid model with three distributed generations. Calculation results have shown that the role of the method is to fully perform the optimal calculation of the power flow on the grid. This is in order to reduce power loss and energy loss as well as increasing operational efficiency while improving power quality in Smart Grid conditions.
Źródło:
Inżynieria Mineralna; 2021, 2; 479--486
1640-4920
Pojawia się w:
Inżynieria Mineralna
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Investigating the impact of intranet resistance and intranet withdrawal in Malaysian maritime industry
Autorzy:
Norzaidi, M. D.
Salwani, M.
Alghanim, S.
Alhamali, R.
Powiązania:
https://bibliotekanauki.pl/articles/258770.pdf
Data publikacji:
2014
Wydawca:
Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
Tematy:
co-workers affluence
negative prior experience
efficacy experience
poor systems design and loss of power
intranet withdrawal
Malaysia maritime industry
Opis:
This article investigates the impact of intranet resistance (i.e. co-workers affluence, negative prior experience, efficacy experience, poor systems design and loss of power) on manager’s performance, which indirectly influences intranet withdrawal in Malaysia maritime industry. The structural equation modeling (SEM) results indicate that all intranet resistance factors negatively influence managers’ performance and indirectly influence intranet withdrawal. This is probably the first work that investigate the impact of intranet resistance and withdrawal in Malaysia. The results provide insight on how the Malaysian maritime industry could improve their intranet adoption.
Źródło:
Polish Maritime Research; 2014, 1; 89-95
1233-2585
Pojawia się w:
Polish Maritime Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Study on the Effectiveness of Monte Carlo Filtering when Correcting Negative SEA Loss Factors
Autorzy:
Nieradka, Paweł
Dobrucki, Andrzej
Powiązania:
https://bibliotekanauki.pl/articles/31339865.pdf
Data publikacji:
2023
Wydawca:
Polska Akademia Nauk. Czasopisma i Monografie PAN
Tematy:
statistical energy analysis
coupling loss factor
Monte Carlo filtering
power injection method
Opis:
The power injection method (PIM) is an experimental method used to identify the statistical energy analysis (SEA) parameters (called loss factors – LFs) of a vibroacoustic system. By definition, LFs are positive real numbers. However, it is not uncommon to obtain negative LFs during experiments, which is considered a measurement error. To date, a recently proposed method, called Monte Carlo filtering (MCF), of correcting negative coupling loss factors (CLFs) has been validated for systems that meet SEA assumptions. In this article, MCF was validated for point connections and in conditions where SEA assumptions are not met (systems with low modal overlap, non-conservative junctions, strong coupling). The effect of removing MCF bias on the results was also examined. During the experiments, it was observed that the bias is inversely proportional to the damping loss factor of the examined subsystems. The obtained results confirm that the PIM, combined with MCF, allows to determine non-negative SEA parameters in all considered cases.
Źródło:
Archives of Acoustics; 2023, 48, 3; 201-218
0137-5075
Pojawia się w:
Archives of Acoustics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A study on the effect of harmonie components of the current supplying an induction motor with reactive power compensation with the use of capacitors on the power loss and voltage variations
Autorzy:
Nawrowski, R.
Stein, Z.
Zieliński, M.
Powiązania:
https://bibliotekanauki.pl/articles/97224.pdf
Data publikacji:
2014
Wydawca:
Politechnika Poznańska. Wydawnictwo Politechniki Poznańskiej
Tematy:
induction motor
current and voltage harmonics
power loss compensation
Opis:
The paper presents an analysis of the effect of voltage harmonics on the power loss in an LV line supplying an induction motor with reactive power compensation, with the use of capacitors, and analysis of the values of output voltage of an MV/LV transformer depending on the load type and value.
Źródło:
Computer Applications in Electrical Engineering; 2014, 12; 275-287
1508-4248
Pojawia się w:
Computer Applications in Electrical Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
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