Temat: power flow - Katalog OPAC zbiorów

Skocz do pozycji: 1.

Tytuł:: 3D simulation of incompressible flow around a rotating turbulator: Effect of rotational and direction speed
Autorzy:: Zoubai, Elhadi
Laidoudi, Houssem
Tlanbout, Ismail
Makinde, Oluwole Daniel
Powiązania:: https://bibliotekanauki.pl/articles/27312235.pdf
Data publikacji:: 2023
Wydawca:: Polska Akademia Nauk. Czasopisma i Monografie PAN
Tematy:: rotating
turbulator
straight tube
drag coefficient
power number
laminar
flow
Opis:: This paper presents new results for the dynamic behaviour of fluid around a rotating turbulator in a channel. The turbulator has a propeller form which is placed inside a flat channel. The research was carried out using 3D numerical simulation. The rationale of the experiment was as follows: we put a propeller-turbulator inside a flat channel, and then we insert a water flow inside the channel. The turbulator rotates at a constant and uniform speed. The main points studied here are the effect of the presence of turbulator and its rotational direction on the flow behaviour behind the turbulator. The results showed that the behaviour of flow behind the turbulator is mainly related to the direction of turbulator rotating. Also, the studied parameters affect coefficients of drag force and power number. For example, when the turbulator rotates in the positive direction, the drag coefficient decreases in terms of rotational speed of the turbulator, while the drag coefficient increases in terms of rotational speed when the turbulator rotates in the negative direction.
Źródło:: Archives of Thermodynamics; 2023, 44, 2; 139--157
1231-0956
2083-6023
Pojawia się w:: Archives of Thermodynamics
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: Automatic adjustment of reactive power by FACTS devices under conditions of voltage instability in the electric network
Automatyczna regulacja mocy biernej przez urządzenia FACTS w warunkach niestabilności napięcia w sieci elektrycznej
Autorzy:: Burbelo, Mykhailo J.
Babenko, Oleksii V.
Loboda, Yurii V.
Lebed, Denys Y.
Kolesnytskyj, Oleh
Rakhmetullina, Saula J.
Mussabekov, Murat
Powiązania:: https://bibliotekanauki.pl/articles/28875006.pdf
Data publikacji:: 2023
Wydawca:: Politechnika Lubelska. Wydawnictwo Politechniki Lubelskiej
Tematy:: reactive power
static synchronous compensator
unified power flow regulator
voltage stability
moc bierna
statyczny kompensator synchroniczny
ujednolicony regulator przepływu mocy
niestabilność napięcia
Opis:: This article describes the problem of automatic regulation of reactive power using electronic devices FACTS (Flexible AC Transmission Systems): static synchronous compensator (STATCOM) and unified power flow controller (UPFC). With the help of a complex writing form, the following are determined: voltages at the installation nodes of the FACTS device and loads, currents of loads, power sources and electronic compensators in caseof voltage instability at the load node of the electrical network. Voltages and currents are determined using the node-voltage method. The taskof STATCOM is partial or full compensation of reactive power. During the reduction of the voltage at the load node, the reactive power generatedby the power source decreases. The STATCOM should partially or fully compensate for the reactive power imbalance as quickly as possible. However,at the same time, it is not possible to fully compensate for the voltage reduction. A series-parallel or parallel-series UPFC can be used to solvethis problem. As a result of using the UPFC, it is possible to automatically raise the voltage level to acceptable values with the help of the UPFC series compensator. The analysis shows that the parallel-serial UPFC is characterized by the stability of operation.In the case of using a series-parallel UPFC, there are restrictions on the ability to adjust the imaginary voltage component of the series compensator, since the angle ofthe voltage vector changes, which causes a failure in the operation of the regulatorof the parallel compensator UPFC.
W artykule opisano problematykę automatycznej regulacji mocy biernej za pomocą urządzeń elektronicznych FACTS (Flexible AC Transmission Systems): statycznego kompensatora synchronicznego (STATCOM) oraz regulatora przepływu mocy (UPFC). Za pomocą złożonego formularza rejestracyjnego określane są: napięcia w węzłach instalacji urządzenia FACTS i obciążenia, prądy obciążenia, źródeł zasilaniai kompensatorów elektronicznych w przypadku niestabilności napięcia w węźle obciążenia siecielektrycznej. Napięcia i prądy są wyznaczane metodą napięć węzłowych. Zadaniem STATCOM jest częściowa lub pełna kompensacja mocy biernej. Podczas spadku napięcia w węźle obciążenia, moc bierna generowana przez źródło zasilania maleje. STATCOMpowinien częściowo lub w pełni skompensować nierównowagę mocy biernej tak szybko,jak to możliwe. Jednocześnie jednak nie jest możliwe pełne skompensowanie spadku napięcia. W celu rozwiązania tego problemu można zastosować szeregowo-równoległy lub równoległo-szeregowy układ UPFC. W wyniku zastosowania UPFC możliwe jest automatyczne podniesienie poziomu napięcia do akceptowalnych wartości za pomocą kompensatora szeregowego UPFC. Analiza pokazuje, że równoległo-szeregowy UPFC charakteryzuje się stabilnością działania. W przypadku zastosowania szeregowo-równoległego UPFC istnieją ograniczenia w zakresie możliwości regulacji składowej urojonej napięcia kompensatora szeregowego, ponieważ zmienia się kąt wektora napięcia, co powoduje awarię działania regulatora kompensatora równoległego UPFC.
Źródło:: Informatyka, Automatyka, Pomiary w Gospodarce i Ochronie Środowiska; 2023, 13, 4; 109--113
2083-0157
2391-6761
Pojawia się w:: Informatyka, Automatyka, Pomiary w Gospodarce i Ochronie Środowiska
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 3.

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

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Skocz do pozycji: 4.

Tytuł:: Smart control of energy storage system in residential photovoltaic systems for economic and technical efficiency
Autorzy:: Kaczorowska, Dominika
Rezmer, Jacek
Janik, Przemysław
Sikorski, Tomasz
Powiązania:: https://bibliotekanauki.pl/articles/2202548.pdf
Data publikacji:: 2023
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: economic efficiency
energy storage system ESS
microgrid management
optimal power flow
OPF
particle swarm optimisation PSO
Opis:: In recent years, due to the increasing number of renewable energy sources, which are characterised by the stochastic nature of the generated power, interest in energy storage has increased. Commercial installations use simple deterministic methods with low economic efficiency. Hence, there is a need for intelligent algorithms that combine technical and economic aspects. Methods based on computational intelligence (CI) could be a solution. The paper presents an algorithm for optimising power flow in microgrids by using computational intelligence methods. This approach ensures technical and economic efficiency by combining multiple aspects in a single objective function with minimal numerical complexity. It is scalable to any industrial or residential microgrid system. The method uses load and generation forecasts at any time horizon and resolution and the actual specifications of the energy storage systems, ensuring that technological constraints are maintained. The paper presents selected calculation results for a typical residential microgrid supplied with a photovoltaic system. The results of the proposed algorithm are compared with the outcomes provided by a deterministic management system. The computational intelligence method allows the objective function to be adjusted to find the optimal balance of economic and technical effects. Initially, the authors tested the invented algorithm for technical effects, minimising the power exchanged with the distribution system. The application of the algorithm resulted in financial losses, €12.78 for the deterministic algorithm and €8.68 for the algorithm using computational intelligence. Thus, in the next step, a control favouring economic goals was checked using the CI algorithm. The case where charging the storage system from the grid was disabled resulted in a financial benefit of €10.02, whereas when the storage system was allowed to charge from the grid, €437.69. Despite the financial benefits, the application of the algorithm resulted in up to 1560 discharge cycles. Thus, a new unconventional case was considered in which technical and economic objectives were combined, leading to an optimum benefit of €255.17 with 560 discharge cycles per year. Further research of the algorithm will focus on the development of a fitness function coupled to the power system model.
Źródło:: Archives of Electrical Engineering; 2023, 72, 1; 81--102
1427-4221
2300-2506
Pojawia się w:: Archives of Electrical Engineering
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 5.

Tytuł:: Cooling water flow influence on power plant unit performance for various condenser configurations setup
Autorzy:: Dobkiewicz-Wieczorek, Ewa
Powiązania:: https://bibliotekanauki.pl/articles/2091367.pdf
Data publikacji:: 2022
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: cooling water
power plant efficiency
cooling water flow control
CHP plant
efficiency
Opis:: This paper presents the influence of cooling water regulation on power plant net efficiency. It was examined whether, for the non-nominal low-pressure turbine load, it is justified to reduce the cooling water pump load, and how it would affect the unit net efficiency. Calculations for two types of power units were carried out: with condensing and extraction-condensing turbine. The tested condensing power plant consists of three surface condensers. The calculation included four condensers’ connections set up on the cooling water side to check how the cooling water system pressure drop affects the net unit performance. The result has confirmed that implementing serial connection decreases net efficiency when cooling water flow regulation is used, but the mixed connection should be applied when pump load is not controlled. It was proved that the cooling water flow control gives a profit for both units. Net efficiency for combined heat and power plant can be improved by 0.1–0.5 pp, the gain is remarkable below 60% of the low-pressure turbine part load. Flow control implementation in the unit with condensing turbine water control gives a similar profit just below 80% of the turbine load. Next, an influence of the additional limitations of a cooling water system (minimal total pump head, cooling tower) affecting the feasibility of implementing the water control has been considered. Applying a multi-cell forced draft cooling tower does not have a significant impact on results, but when a natural draft cooling tower is used, the flow control range is strongly reduced.
Źródło:: Archives of Thermodynamics; 2022, 43, 1; 141--167
1231-0956
2083-6023
Pojawia się w:: Archives of Thermodynamics
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 6.

Tytuł:: Improved Differential Evolution Algorithm to solve multi-objective of optimal power flow problem
Autorzy:: Al-Kaabi, Murtadha
Hasheme, Jaleel Al
Al-Bahrani, Layth
Powiązania:: https://bibliotekanauki.pl/articles/2135728.pdf
Data publikacji:: 2022
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: Multi-objective Improved Differential Evolution Algorithm
MOIDEA
optimal power flow
OPF
set of Pareto front solutions
multi-objective function problems
fuel costs considering emissions
fuel costs considering real power losses
fuel costs considering voltage deviation
Opis:: This article presents a new efficient optimization technique namely the Multi- Objective Improved Differential Evolution Algorithm (MOIDEA) to solve the multiobjective optimal power flow problem in power systems. The main features of the Differential Evolution (DE) algorithm are simple, easy, and efficient, but sometimes, it is prone to stagnation in the local optima. This paper has proposed many improvements, in the exploration and exploitation processes, to enhance the performance of DE for solving optimal power flow (OPF) problems. The main contributions of the DE algorithm are i) the crossover rate will be changing randomly and continuously for each iteration, ii) all probabilities that have been ignored in the crossover process have been taken, and iii) in selection operation, the mathematical calculations of the mutation process have been taken. Four conflicting objective functions simultaneously have been applied to select the Pareto optimal front for the multi-objective OPF. Fuzzy set theory has been used to extract the best compromise solution. These objective functions that have been considered for setting control variables of the power system are total fuel cost (TFC), total emission (TE), real power losses (RPL), and voltage profile (VP) improvement. The IEEE 30-bus standard system has been used to validate the effectiveness and superiority of the approach proposed based on MATLAB software. Finally, to demonstrate the effectiveness and capability of the MOIDEA, the results obtained by this method will be compared with other recent methods.
Źródło:: Archives of Electrical Engineering; 2022, 71, 3; 641--657
1427-4221
2300-2506
Pojawia się w:: Archives of Electrical Engineering
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 7.

Tytuł:: Navigation’s safety improving by efficiently analysis of the ship’s power Plant energy flows interconnection
Autorzy:: Veretennik, A.
Kulyeshov, I.
Mikhailov, S.
Powiązania:: https://bibliotekanauki.pl/articles/2086298.pdf
Data publikacji:: 2022
Wydawca:: Uniwersytet Morski w Gdyni. Wydział Nawigacyjny
Tematy:: navigation’s safety
safety at sea
ship's power plant
power plant energy flows
autonomous movable objects
mechanical energy flow
power plant system
efficiently analysis
Opis:: The operation of an autonomous movable objects, such as a sea transport vessels, implies the presence of a source of potential energy on board the vessel and the possibility of converting this energy into the work required for the autonomous movable object (vessel). Being an autonomous object, a transport vessel should be provided with energy for it moving, energy for heat exchange processes on board and electricity for powering electrical equipment, automation and navigation systems, and household needs on board. An analysis of the component of the engine room equipment made it possible to designate (combine) the generating equipment of mechanical energy flow, equipment which are generating the heat energy flow and equipment which are generating the electric energy flow. Based on the results of the research the relationships between the energy flows are identified connections and ways to ensure stabilization of energy generation on board the cargo vessel is outlined. Using the results of the research the relationships between the energy flows will reduce the likelihood of accidents on board a cargo vessel due to a stop in the generation of one of the energy flows and thereby ensure increased safety of man at sea. Taking into account the peculiarities of the distribution of energy flows in ship power plants can be an effective tool not only to improve the economic performance of it, but also to increase the safety of navigation and navigation in general, due to the reliable provision of uninterrupted and efficient operation of ship power plants.
Źródło:: TransNav : International Journal on Marine Navigation and Safety of Sea Transportation; 2022, 16, 1; 39--42
2083-6473
2083-6481
Pojawia się w:: TransNav : International Journal on Marine Navigation and Safety of Sea Transportation
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 8.

Tytuł:: New approaches for the identification of influential and critical nodes in an electric grid
Autorzy:: Adebayo, Isaiah
Sun, Yanxia
Powiązania:: https://bibliotekanauki.pl/articles/2135727.pdf
Data publikacji:: 2022
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: centrality measures
critical nodes
influential nodes
power flow
power system
Opis:: The aftermath of including new technologies in a modern electric system in conjunction with the incessant rise in power demand could pose a risk to the optimal operation of the system. Therefore, it becomes imperative to identify the most influential and critical nodes of such a system to avert future problems in network operation. In this paper, to identify most significant nodes of the system, the authors propose two measures of centrality in accordance with the network structural properties of a power system, namely, degree centrality (DC) and eigenvector centrality (EC). These are expressed considering the admittance matrix that exists among the interconnection of load to load nodes in an electrical power network. A critical node closeness centrality (CNCC) method is also proposed to identify critical nodes of the system. This is done by modifying the conventional closeness centrality (CC) to include the influence of interconnection that exists between network load to load nodes as captured by the admittance matrix between them. A comparative analysis of the proposed techniques with other conventional methods is also carried out. The result of the simulation shows that the proposed methods could serve as alternative tools in the identification of influential and weak nodes in a power system.
Źródło:: Archives of Electrical Engineering; 2022, 71, 3; 671--686
1427-4221
2300-2506
Pojawia się w:: Archives of Electrical Engineering
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 9.

Tytuł:: Przepływowa mikroelektrownia wodna
Autorzy:: Goryca, Zbigniew
Peczkis, Grzegorz
Powiązania:: https://bibliotekanauki.pl/articles/2091739.pdf
Data publikacji:: 2022
Wydawca:: Wydawnictwo Druk-Art
Tematy:: mikroelektrownia
mikroelektrownia przepływowa
cieki wodne
prędkość przepływu
energia rzek
micro power plant
watercourses
flow velocity
energy of rivers
Opis:: Budowa elektrowni wodnej wymaga wysokich nakładów inwestycyjnych związanych głównie z budową zapory i towarzyszącej jej infrastruktury. Wysokie spiętrzanie wody powoduje zawsze ingerencję w środowisko naturalne rzeki i otaczający ekosystem. Istnieją rozwiązania mikroelektrowni wodnych umieszczanych w nurcie rzeki, minimalnie ingerujących w środowisko i produkujących niewielkie ilości energii elektrycznej.[...] Opracowana konstrukcja może być stosowana na małych ciekach wodnych – tam, gdzie zawodowa energetyka nie jest zainteresowana budową elektrowni wodnych. Miejsc takich jest w kraju bardzo wiele. Moc mikroelektrowni i ilość uzyskiwanej z niej energii zależy w dużym stopniu od prędkości przepływu wody i dlatego mikroelektrownię należy umieszczać w tzw. bystrzach...
Źródło:: Napędy i Sterowanie; 2022, 24, 2; 36--37
1507-7764
Pojawia się w:: Napędy i Sterowanie
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 10.

Tytuł:: Koncepcja zbocznikowania dławikiem przesuwnika fazowego na granicy polsko-niemieckiej
The concept of shifting with the induction coil of the phase shift transmitter at the polish-german border
Autorzy:: Szubert, Krzysztof
Powiązania:: https://bibliotekanauki.pl/articles/2031418.pdf
Data publikacji:: 2021
Wydawca:: Politechnika Gdańska. Wydział Elektrotechniki i Automatyki
Tematy:: FACTS
PST
IPC
sterowanie przepływem mocy
zakłócenia
power flow control
disturbance
Opis:: W artykule przeanalizowano wpływ sterowników FACTS (PST oraz IPC) na pracę połączenia transgranicznego Polska-Niemcy. Stwierdzono, że przesuwnik fazowy PST spełnia podstawowe wymagania i tylko w niewielkim stopniu wpływa na automatykę zabezpieczeniową. Jego rozbudowa do układu międzyfazowego sterownika mocy IPC umożliwiłaby dodatkowo odcięcie się od zakłóceń pochodzących z niemieckiego systemu, jednakże wymagałaby istotnych zmian w automatyce zabezpieczeniowej.
Unplanned energy flow from Germany via Poland to the Czech Republic caused overheating of transmission lines in the west of our country. In order to prevent the necessity to switch off these lines, phase shift transformers (PST) were placed on the border. However, the German system is highly saturated with wind electricity and therefore difficult to steer, which makes it a source of interference for neighbouring countries. The article analyses the impact of flexible AC transmission system (FACTS) drivers on the operation of the Poland-Germany cross-border electrical connection. It was found that the PST meets the basic requirements and has only a slight influence on the protection automatics. Expanding it to the interphase power controller (IPC) would additionally cut off the interference from the German system, however, it would require profound changes in the protection automatics.
Źródło:: Zeszyty Naukowe Wydziału Elektrotechniki i Automatyki Politechniki Gdańskiej; 2021, 73; 57-60
1425-5766
2353-1290
Pojawia się w:: Zeszyty Naukowe Wydziału Elektrotechniki i Automatyki Politechniki Gdańskiej
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 11.

Tytuł:: Stability analysis and efficiency improvement of IPFC using latest PR controller
Autorzy:: Gurijala, Sridhar Babu
Kishore, D. Ravi
Nittala, Ramchandra
Godala, Rohith Reddy
Powiązania:: https://bibliotekanauki.pl/articles/1841160.pdf
Data publikacji:: 2021
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: control algorithms
FACTS devices
multilevel inverter
interline power flow controller
algorytmy sterowania
FAKTY urządzeń
falownik wielopoziomowy
interline kontroler przepływu mocy
Opis:: The deviation from the ideal waveformcauses disturbances and failure of end-user load equipment. Power traveling a long distance from the generation plant to the end-user leads to deterioration of its quality, and the intensive utilization of power leads to serious issues in the grid resulting in power quality problems. To make the system effective and able to meet modern requirements, flexible AC transmission system (FACTS) devices should be installed into the grid. The interline power flow controller (IPFC) is the latest FACTS device, which compensates for both active and reactive power among multi-line systems. The converters used in the IPFC are crucial as they can be adjusted to regulate the power flow among the lines. This paper proposes a cascaded IPFC with hysteresis and proportional resonant voltage controllers. Some main drawbacks of controllers like steady-state errors and reference tracking of converters can be easily achieved by the PR controller, which makes the system efficient and can be used for a wide range of grid applications. Hysteresis and PR controllers are explained in detail in the following sections. A comparative analysis is carried out among control algorithms to choose the suitable controller which maintains stability in the system.
Źródło:: Archives of Electrical Engineering; 2021, 70, 3; 615-630
1427-4221
2300-2506
Pojawia się w:: Archives of Electrical Engineering
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 12.

Tytuł:: The impact of smart transformer on different radialdistribution systems
Autorzy:: Mahmoud, Ibrahem Mohamed A.
Abdelsalam, Tarek Saad
Swief, Rania
Powiązania:: https://bibliotekanauki.pl/articles/1841278.pdf
Data publikacji:: 2021
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: smart transformer
smart grid
direct approach
power flow
power loss reduction
inteligentny transformator
inteligentna sieć
bezpośrednie podejście
przepływ mocy
redukcja strat mocy
Opis:: The work is intended to extend the application of a smart transformer on a radialdistribution system. In this paper, an updated algorithm on the backward/forward powerflow is introduced. The so-called direct approach of power flow is employed and analyzed.In addition, the paper focused on integrating a smart transformer to the network and solvingthe updating network also using the direct approach load flow. The solution of the smarttransformer using the direct approach power flow method is quite straightforward. Thismodel is applied to radial distribution systems which are the IEEE 33- and IEEE 69-bussystems as a case study. Also, the paper optimizes the best allocation of the smart transformerto reduce the power losses of the grid.
Źródło:: Archives of Electrical Engineering; 2021, 70, 2; 271-283
1427-4221
2300-2506
Pojawia się w:: Archives of Electrical Engineering
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 13.

Tytuł:: Approach to Impact Assessment of the Rated Power Uprate of NPP Unit on the Service Life of the Turbine Critical Elements
Autorzy:: Chernousenko, Olga
Nikulenkova, Tetyana
Peshko, Vitaliy
Nikulenkov, Anatolii
Powiązania:: https://bibliotekanauki.pl/articles/1811575.pdf
Data publikacji:: 2020
Wydawca:: Politechnika Koszalińska. Wydawnictwo Uczelniane
Tematy:: nuclear power plant
reliability
turbine
steam flow
computational fluid dynamics
high pressure rotor
service life
long-term strength
low cycle fatigue
Opis:: Nuclear power plants play an important role in power systems of many countries. Ability to reasonable increase installed capacity of nuclear power units allow to reduce the cost for building of new power plants. When increasing NPP capacity to 104% there is a need to estimate the residual life of plant’s typical elements and continue their operation. The mathematical model of estimation of service life indicators of steam turbine K-1000-60/3000 is developed. The effect of increasing the capacity of a nuclear reactor on the heat transfer coefficients of a steam in the nozzle segments of high-pressure cylinder was established by using CFD modeling. The thermal and stress-strain state of the high-pressure rotor for the most typical operating modes are calculated. Using the correlation dependences of low-cycle fatigue, the rate of accumulation of cyclic damage of the base metal is established. The resistance of the metal to the exhaustion of long-term strength is also determined. On the example of the high pressure rotor of the 3rd power unit of Rivne NPP the service life indicators are calculated. The validity of increasing the installed capacity of the power unit was also confirmed.
Źródło:: Rocznik Ochrona Środowiska; 2020, Tom 22, cz. 1; 105-116
1506-218X
Pojawia się w:: Rocznik Ochrona Środowiska
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 14.

Tytuł:: Experimental Equipment for Investigation of Soybean Storage with Active Ventilation
Autorzy:: Duisenova, Sholpan
Atykhanov, Aibek
Karaivanov, Dimitar
Kassymbayev, Bekbossyn
Kalym, Kabdyrakhim
Sagyndikova, Aigul
Powiązania:: https://bibliotekanauki.pl/articles/125394.pdf
Data publikacji:: 2020
Wydawca:: Polskie Towarzystwo Inżynierii Ekologicznej
Tematy:: active ventilation
air flow velocity
conveying height
flow rate
power consumption
productivity
Opis:: The article investigates and substantiates the operating modes of a container-modular equipment with active ventilation, such as specified (real) productivity, power consumption of the conveying process, as well as the use of a progressive method of controlling the humidity and temperature in soybean storage volume. Experimental equipment is developed which adequately simulates the proposed technology for soybean storage with active ventilation for the calculated data verification. The experiments confirm that the proposed experimental equipment makes it possible to adequately simulate the process of soybean storage with active ventilation and conduct experiments with the regulation of basic parameters such as productivity, power consumption, humidity, etc. using modern methods, devices and digital technologies. Experimental results are presented. Along with this, using the “Strazh Klimat” software, humidity and temperature are monitored during the experiments. Experimental data are obtained by the use of which it is possible to establish the dependence of the conveying height on the air flow velocity.
Źródło:: Journal of Ecological Engineering; 2020, 21, 3; 117-127
2299-8993
Pojawia się w:: Journal of Ecological Engineering
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 15.

Tytuł:: Metaheuristic approach to optimal power flow using mixed integer distributed ant colony optimization
Autorzy:: Suresh, Vishnu
Janik, Przemyslaw
Jasinski, Michal
Powiązania:: https://bibliotekanauki.pl/articles/141692.pdf
Data publikacji:: 2020
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: ant colony optimization
IEEE 30 bus
IEEE 57 bus
metaheuristic algorithm
mixed integer distributed ant colony optimization
optimal power flow
Opis:: This paper presents the application of an improved ant colony optimization algorithm called mixed integer distributed ant colony optimization to optimize the power flow solution in power grids. The results provided indicate an improvement in the reduction of operational costs in comparison with other optimization algorithms used in optimal power flow studies. The application was realized to optimize power flow in the IEEE 30 and the IEEE 57 bus test cases with the objective of operational cost minimization. The optimal power flow problem described is a non-linear, non-convex, complex and heavily constrained problem.
Źródło:: Archives of Electrical Engineering; 2020, 69, 2; 335-348
1427-4221
2300-2506
Pojawia się w:: Archives of Electrical Engineering
Dostawca treści:: Biblioteka Nauki

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