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Wyświetlanie 1-50 z 1368
Tytuł:
Vulnerability of power system to cyberattacks
Autorzy:
Chyła, Tomasz
Maciejewska, Weronika
Powiązania:
https://bibliotekanauki.pl/articles/2085635.pdf
Data publikacji:
2021
Wydawca:
Instytut Polityki Energetycznej im. Ignacego Łukasiewicza
Tematy:
SCADA
energetics system vulnerability
cybersecurity
Opis:
Electricity significantly determines the possibility of development of technical civilisation, both on a global and local scale. The availability of energy determines the diversity of civilisational development of communities inhabiting particular areas of the earth. The Internet, in turn, as a tool conducive to the human species, induces many opportunities while simultaneously generating threats. The Supervisory Control and Data Acquisition (SCADA) systems used in the power industry are key elements in the operation of industrial facilities and critical infrastructure, while also being vulnerable to cyberattacks. Successful cyberattacks can cripple internal processes, cause financial losses and potentially lead to unwanted block-outs.
Źródło:
Energy Policy Studies; 2021, No. 2 (8); 13-24
2545-0859
Pojawia się w:
Energy Policy Studies
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Voltage Security Assessment of Power System
Autorzy:
Chowdhury, Amit Kumar
Mondal, Surajit
Alam, S. K. Mehboob
Pal, Jagadish
Powiązania:
https://bibliotekanauki.pl/articles/1193939.pdf
Data publikacji:
2015
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
1P-1Q Method
Fast Decoupled Load flow
Voltage Collapse
Voltage Performance index
Voltage Stability
Voltage insecurity
Opis:
This paper deals with the security aspects of power system by evaluating the severity of transmission line outage. Voltage security assessment is made by determining the power flow in the line using load flow for each contingency. The severity of contingency is measured using a scalar index called Voltage performance index. 1P-1Q Method and Fast Decoupled load flow are used as approximate and exact load flow methods for Voltage security assessment respectively. Contingency analysis is carried out and ranked lists in the decreasing order of severity based on Voltage Performance Index values are prepared for standard test systems. The severity of line is evaluated and compared using these load flow methods.
Źródło:
World Scientific News; 2015, 21; 36-50
2392-2192
Pojawia się w:
World Scientific News
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Damping low-frequency oscillations in a multi-machine power system using a fuzzy-multi-band power system stabilizer
Autorzy:
Essallah, Sirine
Khedher, Adel
Powiązania:
https://bibliotekanauki.pl/articles/41178019.pdf
Data publikacji:
2022
Wydawca:
Politechnika Warszawska, Instytut Techniki Cieplnej
Tematy:
power system stability
low-frequency oscillations
Fuzzy-MB-PSS
stabilność systemu elektroenergetycznego
niska częstotliwość
oscylacje
Opis:
Synchronous generators are usually eguipped with power system stabilizers (PSS) to damp low-freguency oscillations. Among the various types of PSS, it has recently been demonstrated that the Multi-Band PSS (MB-PSS) has a better performance to handle all global, inter-area and local modes. However, the performance of this PSS may degrade since the power supply system is intrinsically non-linear and its operating conditions freguently change. This paper introduces a new design of MB-PSS based on Mamdani Fuzzy inference (Fuzzy-MB-PSS). Compared to the IEEE standard MB-PSS, the proposed stabilizer is more efficient owing to its ability to deal with oscillations at different operating points. The controller is tested on a power system benchmark under various disturbance conditions to prove its robustness and to demonstrate its superiority over conventional PSS and MB-PSS.
Źródło:
Journal of Power Technologies; 2022, 102, 4; 140-148
1425-1353
Pojawia się w:
Journal of Power Technologies
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Selectivity of power system protections at power swings in power system
Selektywność działania zabezpieczeń w trakcie kołysań mocy w systemie elektroenergetycznym
Autorzy:
Machowski, J.
Powiązania:
https://bibliotekanauki.pl/articles/397212.pdf
Data publikacji:
2012
Wydawca:
ENERGA
Tematy:
power system protection
power swings
selectivity
zabezpieczenia elektroenergetyczne
kołysania mocy
selektywność
Opis:
The paper discusses out-of-step protection systems such as: generator pole slip protections, out of step tripping protections, distance protections of step-up transformer, distance protections of transmission lines and transformers, power swing blocking, and special out-of-step protection. It is shown that all these protections make up a protection system, to which a setting concept uniform for the entire power system has to be applied. If a power system is inappropriately equipped with these protections, or their settings are inappropriate, they may operate unselectively, thus contributing to the development of power system blackouts. In the paper the concepts for a real power system are given for the two stages: target stage fully compliant with selectivity criteria, and transitional stage between the current and target stages.
W artykule omówiono zabezpieczenia związane z kołysaniami mocy, takie jak: zabezpieczenia generatorów od poślizgu biegunów, zabezpieczenia rozcinające od pracy asynchronicznej w sieci, zabezpieczenia odległościowe bloków generator-transformator, zabezpieczenia odległościowe linii przesyłowych i transformatorów, blokady kołysaniowe, automatyka przeciwkołysaniowa. Wykazano, że zabezpieczenia te stanowią łącznie system zabezpieczeń, wobec którego musi być stosowana koncepcja nastawień, jednolita dla całego systemu elektroenergetycznego. Przy nieodpowiednim wyposażaniu systemu elektroenergetycznego w te zabezpieczenia lub ich nieodpowiednim nastawianiu mogą one działać nieselektywnie, przyczyniając się do rozwoju awarii systemowych. Podano koncepcję dla dwóch etapów: etapu docelowego, spełniającego w pełni warunki selektywności, oraz etapu przejściowego między stanem aktualnym a docelowym.
Źródło:
Acta Energetica; 2012, 4; 96-123
2300-3022
Pojawia się w:
Acta Energetica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Analysis of power system stabilizer Pareto optimisation-when taking into account the uncertainty of power system mathematical model parameters
Autorzy:
Nocoń, A.
Paszek, S.
Powiązania:
https://bibliotekanauki.pl/articles/140408.pdf
Data publikacji:
2011
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
stabilizator systemowy
niepewność parametrów
Pareto-optymalizacja
power system stabilizer
Pareto optimization
parameter uncertainty
Opis:
The paper presents analysis of optimisation results of power system stabilizer (PSS) parameters when taking into account the uncertainty of mathematical model parameters of the power system (PS) elements. The Pareto optimisation was used for optimisation of the system stabilizer parameters. Parameters of five stabilizers of PSS3B type were determined in optimisation process with use of a genetic algorithm with tournament selection. The results obtained were assessed from the point of view of selecting the criterion function. The analysis of influence of the parameter uncertainty on the quality of the results obtained was performed.
Źródło:
Archives of Electrical Engineering; 2011, 60, 4; 385-398
1427-4221
2300-2506
Pojawia się w:
Archives of Electrical Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Power system state estimation using dispersed particle filter
Autorzy:
Kozierski, P.
Lis, M.
Horla, D.
Powiązania:
https://bibliotekanauki.pl/articles/950942.pdf
Data publikacji:
2014
Wydawca:
Sieć Badawcza Łukasiewicz - Przemysłowy Instytut Automatyki i Pomiarów
Tematy:
particle filter
power system
state observer
state estimation
dispersed estimation
Opis:
The paper presents a new approach to particle filtering, i.e. Dispersed Particle Filter. This algorithm has been applied to the power system, but it can also be used in other transmission networks. In this approach, the whole network must be divided into smaller parts. As it has been shown, use of Dispersed Particle Filter improves the quality of the state estimation, compared to a simple particle filter. It has been also checked that communication between subsystems improves the obtained results. It has been checked by means of simulation based on model, which has been created on the basis of knowledge about practically functioning power systems.
Źródło:
Journal of Automation Mobile Robotics and Intelligent Systems; 2014, 8, 3; 35-40
1897-8649
2080-2145
Pojawia się w:
Journal of Automation Mobile Robotics and Intelligent Systems
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Parallel PBIL applied to power system controller design
Autorzy:
Folly, K.
Powiązania:
https://bibliotekanauki.pl/articles/91747.pdf
Data publikacji:
2013
Wydawca:
Społeczna Akademia Nauk w Łodzi. Polskie Towarzystwo Sieci Neuronowych
Tematy:
Population-Based Incremental Learning algorithm
PBIL algorithm
Opis:
Population-Based Incremental Learning (PBIL) algorithm is a combination of evolutionary optimization and competitive learning derived from artificial neural networks. PBIL has recently received increasing attention in various engineering fields due to its effectiveness, easy implementation and robustness. Despite these strengths, it was reported in the last few years that PBIL suffers from issues of loss of diversity in the population. To deal with this shortcoming, this paper uses parallel PBIL based on multi-population. In parallel PBIL, two populations are used where both probability vectors (PVs) are initialized to 0.5. It is believed that by introducing two populations, the diversity in the population can be increased and better results can be obtained. The approach is applied to power system controller design. Simulations results show that the parallel PBIL approach performs better than the standard PBIL and is as effective as another diversity increasing PBIL called adaptive PBIL.
Źródło:
Journal of Artificial Intelligence and Soft Computing Research; 2013, 3, 3; 215-223
2083-2567
2449-6499
Pojawia się w:
Journal of Artificial Intelligence and Soft Computing Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Sterownik autonomicznego systemu zasilania
Autonomous power system controller
Autorzy:
Bogusławski, P.
Łowiec, E.
Milak, A.
Powiązania:
https://bibliotekanauki.pl/articles/159221.pdf
Data publikacji:
2011
Wydawca:
Sieć Badawcza Łukasiewicz - Instytut Elektrotechniki
Tematy:
generator fotowoltaiczny
przekształtnik DC/DC
mikrokontroler
akumulator chemiczny
Opis:
Przedstawiono opis praktycznej realizacji oraz wyniki badań uniwersalnego solarnego układu zasilania małej mocy z akumulatorem chemicznym i bezprzewodowym interfejsem komunikacyjnym. Opisano elementy składowe sterownika układu.
A practical implementation and laboratory researches for an universal solar low-power power system containing the chemical battery and a wireless communication interface is presented in this paper. The components of the system controller are described.
Źródło:
Prace Instytutu Elektrotechniki; 2011, 251; 5-20
0032-6216
Pojawia się w:
Prace Instytutu Elektrotechniki
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Use of Pareto optimisation for tuning power system stabilizers
Autorzy:
Paszek, S.
Powiązania:
https://bibliotekanauki.pl/articles/201080.pdf
Data publikacji:
2012
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
Pareto optimization
power system stabilizers
power system
electromechanical swings
Opis:
The paper presents a method for determining sets of Pareto optimal solutions (compromise sets) – parameter values of PSS3B system stabilizers working in a multi-machine power system – when optimising different multidimensional criteria. These criteria are determined for concrete disturbances when taking into account transient waveforms of the instantaneous power, angular speed and terminal voltage of generators in one, chosen generating unit or in all units of the system analysed. The application of multi-criteria methods allows taking into account the optimisation process of power system stabilizer (PSS) parameters, many sometimes contradictory requirements (criteria) without losing ability to reach the optimal solution. A choice of the compromise solution can be made by assuming the values of the weighting coefficients associated with particular components of the vector criterion and determining the equivalent, global criterion. A change of the values of those weighting coefficients in the equivalent criterion does not require, in the case of the Pareto optimization, carrying out repeated calculations.
Źródło:
Bulletin of the Polish Academy of Sciences. Technical Sciences; 2012, 60, 1; 125-131
0239-7528
Pojawia się w:
Bulletin of the Polish Academy of Sciences. Technical Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Stan krajowego systemu elektroenergetycznego
State of Polish Power System
Autorzy:
Maciejewski, Z.
Powiązania:
https://bibliotekanauki.pl/articles/283015.pdf
Data publikacji:
2011
Wydawca:
Polska Akademia Nauk. Instytut Gospodarki Surowcami Mineralnymi i Energią PAN
Tematy:
system elektroenergetyczny
energia elektryczna
sieci przesyłowe
prognozowanie
power system
electricity
network system
forecasting
Opis:
W pracy przedstawiono obecny stan krajowego systemu elektroenergetycznego. Zwrócono uwagę na dekapitalizację środków trwałych krajowego systemu elektroenergetycznego. Przedstawiono prognozę krajowego zapotrzebowania na energię elektryczną do 2030 roku. Zaproponowano kierunki rozbudowy krajowej sieci przesyłowej dla zapewnienia bezpieczeństwa elektroenergetycznego i rozwoju kraju.
In the paper current state of the Polish Power System is presented. Problem of the decapitalization of the Polish Power Idustry was discussed. It is given forecasts of domestic electricity demand to 2030 year. There are proposed some directions of the network system developing in order to ensure of security of the power system and in general development of Poland.
Źródło:
Polityka Energetyczna; 2011, 14, 2; 249-259
1429-6675
Pojawia się w:
Polityka Energetyczna
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Artificial genetic code of development of electric power system
Autorzy:
Tchórzewski, J.
Powiązania:
https://bibliotekanauki.pl/articles/92982.pdf
Data publikacji:
2010
Wydawca:
Uniwersytet Przyrodniczo-Humanistyczny w Siedlcach
Tematy:
electric power system
modem electric power system
unmanned manufactory
self-developing system
control theory
identification of development
MATLAB
Simulink
Opis:
The paper presents the results of research concerning the identification of electric power system development, which was carried out for the IEEE RST 96 test data [4, 13]. The problem of development was formulated in the form of artificial genetic code, and the results of the research concerning the regularities of the development of the electric power system on the basis of IEEE RST 96 test data, including the obtained coefficient-based artificial code of development.
Źródło:
Studia Informatica : systems and information technology; 2010, 1-2(14); 29-37
1731-2264
Pojawia się w:
Studia Informatica : systems and information technology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Pulsed Power System for the Orion High Power Laser
Autorzy:
Mead, M.
Moncho-Banuls, S.
Pottier, S.
Brasile, J.
Powiązania:
https://bibliotekanauki.pl/articles/1807863.pdf
Data publikacji:
2009-06
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
42.60.By
84.60.Ve
Opis:
This paper describes the design and testing of the pulsed power system for the Orion Laser, which will be used for high temperature and density plasma physics research. The system supplies 8 MJ of energy to laser amplifiers and Faraday rotators. It consists of 17 capacitor bank modules, each with up to sixteen 150 μF charge storage capacitors, 25 kV power supply and controls. The energy is delivered by spark-gap switches to give a pre-pulse to ionise the flashlamps and a main pulse of 490 μs. The system delivers 5 shots a day with less than 0.2% variation in charge voltage.
Źródło:
Acta Physica Polonica A; 2009, 115, 6; 978-979
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
High-speed power system stability simulation using analog computation
Autorzy:
Nagel, I.
Fabre, L.
Cherkaoui, R.
Kayal, M.
Powiązania:
https://bibliotekanauki.pl/articles/398151.pdf
Data publikacji:
2010
Wydawca:
Politechnika Łódzka. Wydział Mikroelektroniki i Informatyki
Tematy:
mikroelektroniczna emulacja
symulacja wysokiej prędkości
przemijająca stabilność systemu elektroenergetycznego
obliczenia analogowe
microelectronic emulation
high-speed simulation
power system transient stability
analog computation
ASIC
Opis:
This paper presents a microelectronic emulation approach for high-speed power system computation. First, the problems of existing power system simulators are detailed. This shows that microelectronic emulation is a possible solution for solving the speed problems of existing simulators. Second, this paper presents one specific emulation approach, the so-called AC emulation approach. The ultimate objective of the AC emulation approach is the realization of a power system emulator which reproduces simultaneously a large number of phenomena of different time constants or frequencies with a much higher speed than real time. Frequency dependence of the elements is preserved and the signals propagating in the emulated network are the shrunk or downscaled current and voltage waves of the real power network. The models of the power network components are detailed. Special attention is paid to the generator model which was shown to introduce a systematic error. This systematic error is quantified, analyzed and optimized. Moreover behavioral simulation results confirm the feasibility of this approach which in turn lays the foundation for such an emulator.
Źródło:
International Journal of Microelectronics and Computer Science; 2010, 1, 2; 180-187
2080-8755
2353-9607
Pojawia się w:
International Journal of Microelectronics and Computer Science
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
IEC 61850 interface for real time power system simulation
Autorzy:
Kurek, Karol
Nogal, Łukasz
Kowalik, Ryszard
Januszewski, Marcin
Powiązania:
https://bibliotekanauki.pl/articles/2128161.pdf
Data publikacji:
2021
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
implementation in real time
power system
protection relays testing
computer simulation
IEC 61850
realizacja w czasie rzeczywistym
system zasilania
testowanie przekaźników zabezpieczeniowych
symulacja komputerowa
Opis:
Real time simulators of IEC 61850 compliant protection devices can be implemented without their analogue part, reducing costs and increasing versatility. Implementation of Sampled Values (SV) and GOOSE interfaces to Matlab/Simulink allows for interaction with protection relays in closed loop during power system simulation. Properly configured and synchronized Linux system with Real Time (RT) patch, can be used as a low latency run time environment for Matlab/Simulink generated model. The number of overruns during model execution using proposed SV and GOOSE interfaces with 50 µs step size is minimal. The paper discusses the implementation details and time synchronization methods of IEC 61850 real time simulator implemented in Matlab/Simulink that is built on top of run time environment shown in authors preliminary works and is the further development of them. Correct operation of the proposed solution is evaluated during the hardware-in-the-loop testing of ABB REL670 relay.
Źródło:
Bulletin of the Polish Academy of Sciences. Technical Sciences; 2021, 69, 3; e137057, 1--6
0239-7528
Pojawia się w:
Bulletin of the Polish Academy of Sciences. Technical Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
IEC 61850 interface for real time power system simulation
Autorzy:
Kurek, Karol
Nogal, Łukasz
Kowalik, Ryszard
Januszewski, Marcin
Powiązania:
https://bibliotekanauki.pl/articles/2173592.pdf
Data publikacji:
2021
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
implementation in real time
power system
protection relays testing
computer simulation
IEC 61850
realizacja w czasie rzeczywistym
system zasilania
testowanie przekaźników zabezpieczeniowych
symulacja komputerowa
Opis:
Real time simulators of IEC 61850 compliant protection devices can be implemented without their analogue part, reducing costs and increasing versatility. Implementation of Sampled Values (SV) and GOOSE interfaces to Matlab/Simulink allows for interaction with protection relays in closed loop during power system simulation. Properly configured and synchronized Linux system with Real Time (RT) patch, can be used as a low latency run time environment for Matlab/Simulink generated model. The number of overruns during model execution using proposed SV and GOOSE interfaces with 50 µs step size is minimal. The paper discusses the implementation details and time synchronization methods of IEC 61850 real time simulator implemented in Matlab/Simulink that is built on top of run time environment shown in authors preliminary works and is the further development of them. Correct operation of the proposed solution is evaluated during the hardware-in-the-loop testing of ABB REL670 relay.
Źródło:
Bulletin of the Polish Academy of Sciences. Technical Sciences; 2021, 69, 3; art. no. e137057
0239-7528
Pojawia się w:
Bulletin of the Polish Academy of Sciences. Technical Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Superconducting Fault Current Limiter for the Electric Power System
Autorzy:
Majka, M.
Kozak, J.
Powiązania:
https://bibliotekanauki.pl/articles/1398610.pdf
Data publikacji:
2016-08
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
85.25.-j
Opis:
Superconducting fault current limiters are the most attractive devices for the power network, they can be used to limit the short current in electrical network. The operation of a superconducting fault current limiter is based on the sudden transition from the superconducting state to the normal state by exceeding the critical current $I_{c}$ of the material. This transition one takes a very short time, so fast that we are able to limit the first current peak to a threshold value which does not exceed three to five times the rated current. This paper presents the design, the calculated electrical parameters and tests of the medium voltage class superconducting fault current limiter prototypes made in Electrotechnical Institute. The constructed coreless superconducting fault current limiter consists of three windings: ones made of SF12050 tape and a parallel connected primary copper winding. All windings are inductively coupled and intended to work in liquid nitrogen.
Źródło:
Acta Physica Polonica A; 2016, 130, 2; 581-584
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Resistojet thruster with a power system based on supercapacitors
Autorzy:
Mezyk, L.
Kobiera, A.
Boruc, L.
Biczel, P.
Wolanski, P.
Powiązania:
https://bibliotekanauki.pl/articles/115727.pdf
Data publikacji:
2014
Wydawca:
Fundacja na Rzecz Młodych Naukowców
Tematy:
resistojet
thruster
satellite
ster strumieniowy
satelita
Opis:
This paper presents research into a resistojet model that can be powered by supercapacitors for satellite propulsion applications. The performance of the system, calculated including a preliminary study of mass and power budget, shows that this solution has potential for a certain range of space missions. The main problem when designing a pulsed resistojet is the compromise between the thermal capacity of the resistojet and the heat transfer efficiency of the device. When the heater is used in pulsed mode, it should have low mass and thermal capacity in order to reduce the energy required to heat the devices. On the other hand, the main technical restriction in resistojet thrusters is heat transfer due to the laminar regime of the flow in the heater. The heat transfer area should be as large as possible, but the mass of the device limits any such increase in area. In this research several design options were considered in an attempt to find the optimal solution. After research on the oscillating element and porous heater, capillary tubes directly heated by the current were determined to be the most effective solution. A power supply based on supercapacitors was constructed. It consists of 30 supercapacitors of 300 F each, connected to deliver 70 V of voltage, 10F of total capacitance and maximum peak power of 5 kW. Research for three different gases – ammonia, propane and butane – was conducted and the results are presented in this paper.
Źródło:
Challenges of Modern Technology; 2014, 5, 3; 13-21
2082-2863
2353-4419
Pojawia się w:
Challenges of Modern Technology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Wpływ niepewności systemu elektroenergetycznego na polioptymalne parametry stabilizatorów systemowych
The impact of the power system uncertainty on polyoptimal parameters of power system stabilizers
Autorzy:
Nocoń, A.
Paszek, S.
Powiązania:
https://bibliotekanauki.pl/articles/266570.pdf
Data publikacji:
2015
Wydawca:
Politechnika Gdańska. Wydział Elektrotechniki i Automatyki
Tematy:
System elektroenergetyczny
stabilizatory systemowe
polioptymalizacja
niepewność parametrów
Power system
power system stabilizers
polyoptimalization
uncertainty parameters
Opis:
W artykule przedstawiono analizę wpływu niepewności parametrów modelu matematycznego systemu elektroenergetycznego na polioptymalne parametry stabilizatorów systemowych typu PSS2A. Kryteria optymalizacyjne określono dla zakłóceń występujących w siedmiomaszynowym systemie elektroenergetycznym, biorąc pod uwagę przebiegi przejściowe mocy chwilowych, prędkości kątowych (przebiegi związane z kołysaniami elektromechanicznymi) oraz napięcia zaciskowego generatorów. Do optymalizacji wielokryterialnej wykorzystano zmodyfikowany algorytm genetyczny. Ocenę wpływu niepewności na jakość pracy stabilizatorów systemowych o zoptymalizowanych parametrach przeprowadzono z wykorzystaniem statystycznych wskaźników deformacji.
In the paper there is presented the analysis of the impact of different uncertainty sources of a power system on polyoptimal parameters of PSS2A power system stabilizers. For parameter optimization of power system stabilizers there was used polyoptimization (multi-criteria optimization). The optimization criteria were determined for disturbances occurring in a multi-machine power system. There were taken into account the transient waveforms associated with electromechanical swings (the instantaneous power and angular speed) as well as the waveforms of the terminal voltage of generators. A genetic algorithm with floating point encoding, tournament selection, averaging crossover and non-uniform mutation, modified for research, was used for the optimization. Assessment of the impact of the uncertainty on the quality of operation of the power system stabilizers with optimized parameters was made with the use of deformation factors.
Źródło:
Zeszyty Naukowe Wydziału Elektrotechniki i Automatyki Politechniki Gdańskiej; 2015, 42; 73-76
1425-5766
2353-1290
Pojawia się w:
Zeszyty Naukowe Wydziału Elektrotechniki i Automatyki Politechniki Gdańskiej
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Robust design of power system stabilizer using bacterial foraging algorithm
Autorzy:
Abdul Hameed, K.
Palani, S.
Powiązania:
https://bibliotekanauki.pl/articles/141194.pdf
Data publikacji:
2013
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
bacterial foraging algorithm
power system stabilizer
power system stability
Opis:
In this paper, a novel bacterial foraging algorithm (BFA) based approach for robust and optimal design of PID controller connected to power system stabilizer (PSS) is proposed for damping low frequency power oscillations of a single machine infinite bus bar (SMIB) power system. This paper attempts to optimize three parameters (Kp, Ki, Kd) of PID-PSS based on foraging behaviour of Escherichia coli bacteria in human intestine. The problem of robustly selecting the parameters of the power system stabilizer is converted to an optimization problem which is solved by a bacterial foraging algorithm with a carefully selected objective function. The eigenvalue analysis and the simulation results obtained for internal and external disturbances for a wide range of operating conditions show the effectiveness and robustness of the proposed BFAPSS. Further, the time domain simulation results when compared with those obtained using conventional PSS and Genetic Algorithm (GA) based PSS show the superiority of the proposed design.
Źródło:
Archives of Electrical Engineering; 2013, 62, 1; 141-152
1427-4221
2300-2506
Pojawia się w:
Archives of Electrical Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Power system participation factors for real and complex eigenvalues cases
Autorzy:
Konoval, V.
Prytula, R.
Powiązania:
https://bibliotekanauki.pl/articles/376120.pdf
Data publikacji:
2017
Wydawca:
Politechnika Poznańska. Wydawnictwo Politechniki Poznańskiej
Tematy:
modal analysis
participation factor
static stability
power system
Opis:
This paper provides a brief overview on existing approaches for defining participation factor in modal analysis. We calculated participation factors using different approximations and specific examples, and then compared the obtained results with equations derived from the mode evolution. As a result, the existing methods for determining a state variable participation factor in mode are proved incorrect result for complex eigenvalue case. Modem software applications designed to analyze power system stability deploy old approaches that provide incorrect results of modal analysis and pose risks to the operation of real power systems. To solve this problem we presented a new broadened definition of participation factor that assures correct results for real and complex eigenvalues cases. We used a two-mass mechanics system to validate proposed approach and our findings confirm the proposed participation factor theory.
Źródło:
Poznan University of Technology Academic Journals. Electrical Engineering; 2017, 90; 369-381
1897-0737
Pojawia się w:
Poznan University of Technology Academic Journals. Electrical Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Eksperymentalna elektrownia solarno - wiatrowa
Experimental wind – solar hybrid power system
Autorzy:
Polak, A.
Powiązania:
https://bibliotekanauki.pl/articles/1367798.pdf
Data publikacji:
2015
Wydawca:
Sieć Badawcza Łukasiewicz - Instytut Napędów i Maszyn Elektrycznych Komel
Tematy:
elektrownia słoneczna
elektrownia wiatrowa
tracker dwuosiowy
moduł fotowoltaiczny
solar power
wind power
biaxial tracker
photovoltaic module
Opis:
In the article the author presents his own experiences and observations related to the conversion system operation of the solar and wind energy into electricity. Wind – solar hybrid power system that has been built is composed of three segments: the first segment of a small wind turbine with a rated power PN = 3,5 kW, the second segment consists of polycrystalline PV modules with a maximum power P = 750 Wp installed on a fixed frame, the third segment is composed of polycrystalline PV modules with a maximum power P = 750 Wp installed on biaxial tracker, which follows the sun in the horizontal and vertical planes. All segments of the wind – solar hybrid power system is equipped with independent measuring systems, which allows, among others, separate registration of the energy produced by each segment.
W artykule autor przedstawił własne doświadczenia i obserwacje związane z eksploatacją ww. systemu konwersji energii słonecznej i wiatrowej na elektryczną. Zainstalowana minielektrownia złożona jest z trzech segmentów: • segment pierwszy to mała elektrownia wiatrowa o mocy znamionowej PN = 3,5 kW, • segment drugi składa się z polikrystalicznych modułów fotowoltaicznych o mocy maksymalnej P = 750 Wp, zainstalowanych na nieruchomym stelażu, • segment trzeci składa się polikrystalicznych modułów fotowoltaicznych o mocy maksymalnej P = 750 Wp, zainstalowanych na trackerze dwuosiowym podążającym za słońcem w płaszczyznach poziomej i pionowej. Wszystkie segmenty elektrowni są wyposażone w niezależne układy pomiarowe, umożliwiające m.in. rejestrację ilości wyprodukowanej przez nie energii.
Źródło:
Maszyny Elektryczne: zeszyty problemowe; 2015, 2, 106; 235-237
0239-3646
2084-5618
Pojawia się w:
Maszyny Elektryczne: zeszyty problemowe
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Applying a fractional coil model for power system ferroresonance analysis
Autorzy:
Majka, Ł.
Powiązania:
https://bibliotekanauki.pl/articles/200329.pdf
Data publikacji:
2018
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
ferroresonant circuit
fractional derivative
ferromagnetic core coil
hysteresis
modeling
measurement verification
nonlinear dynamics
power system
pochodna ułamkowa
histereza
modelowanie
nieliniowa dynamika
układ zasilania
Opis:
This paper addresses the problem of modeling the nonlinear coil used for ferroresonant circuit analysis. The effect of ferroresonance is described and a general modeling approach is presented. The hysteresis modeling problem is also shortly discussed, on the example of a ferromagnetic coil. A brief overview of available literature and contributors to this area are provided. A series RLC circuit supplied from an AC source is discussed. The application of the fractional derivative in the modeling of an iron core coil is presented and suggestions of model implementations are given. The computations performed are illustrated by means of waveform data obtained from computer simulations and compared with those obtained from measurements performed in a specially prepared laboratory setup.
Źródło:
Bulletin of the Polish Academy of Sciences. Technical Sciences; 2018, 66, 4; 467-474
0239-7528
Pojawia się w:
Bulletin of the Polish Academy of Sciences. Technical Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Wrong transition and measurement models in power system state estimation
Autorzy:
Kozierski, P.
Lis, M.
Horla, D.
Powiązania:
https://bibliotekanauki.pl/articles/141129.pdf
Data publikacji:
2016
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
particle filter
estimation quality
Population Monte Carlo
Opis:
The influence of wrong information about transition and measurement models on estimation quality has been presented in the paper. Two methods of a particle filter, with and without the Population Monte Carlo modification, and also the extended and unscented Kalman filters methods have been compared. A small 5-bus power system has been used in simulations, which have been performed based on one data set, and this data set has been chosen from among 100 different – to draw the most general conclusions. Based on the obtained results it has been found that for the particle filter methods the implementation of the slightly higher standard deviation than the true value, usually increases the estimation quality. For the Kalman filters methods it has been concluded that optimal values of variances are equal to the true values.
Źródło:
Archives of Electrical Engineering; 2016, 65, 3; 559-574
1427-4221
2300-2506
Pojawia się w:
Archives of Electrical Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Electric Power System from the point of view of model development
Autorzy:
Tchórzewski, J.
Powiązania:
https://bibliotekanauki.pl/articles/97407.pdf
Data publikacji:
2010
Wydawca:
Politechnika Poznańska. Wydawnictwo Politechniki Poznańskiej
Tematy:
Electrical Power System
EPS
MATLAB
Opis:
In order to conduct the identification of the development of the Electrical Power System (EPS) appropriate numerical data were collected concerning fourteen input variables (ui-ui4) and four output variables (yi-y4) for the period of 1946-2007, with the input variables structure presented in Table 1 and output in Table 2 [2537]. Identification of electrical power system (EPS) for the 30 one-year-long periods for the years 1946-2007, with the step of one year was conducted in the MATLAB environment using System Identification Toolbox [1, 7, 41].
Źródło:
Computer Applications in Electrical Engineering; 2010, 8; 242-259
1508-4248
Pojawia się w:
Computer Applications in Electrical Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Load management via AMI and risk of overloading the power system
Autorzy:
Billewicz, K.
Powiązania:
https://bibliotekanauki.pl/articles/1812166.pdf
Data publikacji:
2012
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
smart meter
load management
overloading the power system
Opis:
One advantage of AMI is the ability to Demand Side Management. The ability to control the client devices (Load management) is one of the key function of AMI. Some customers with smart meters and Time-of-Use (TOU) tariffs pay different amounts for their electricity over three (or two) different time periods. They can program their smart appliances. Customer's devices are switched-on when energy is cheaper, and switched-off when it is more expensive. If clients on a massive scale will run their devices at a time when energy is cheaper, then it would affect the bulk electric grid.
Źródło:
Prace Naukowe Instytutu Maszyn, Napędów i Pomiarów Elektrycznych Politechniki Wrocławskiej. Studia i Materiały; 2012, 66, 32; 384-388
1733-0718
Pojawia się w:
Prace Naukowe Instytutu Maszyn, Napędów i Pomiarów Elektrycznych Politechniki Wrocławskiej. Studia i Materiały
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Application of risk analysis in maintenance of ship power system elements
Autorzy:
Adamkiewicz, A.
Fydrych, J.
Powiązania:
https://bibliotekanauki.pl/articles/359078.pdf
Data publikacji:
2013
Wydawca:
Akademia Morska w Szczecinie. Wydawnictwo AMSz
Tematy:
technical risk
seagoing vessel
power system
maintenance strategy
Opis:
Searching for a safe ship, this paper presents operational strategies which are used for ship power system maintenance, conditions for their realization have been shown. The procedure of risk analysis has been decomposed and its stages have been discussed. Methods of risk evaluation and methods of ship power system threat identification have been analyzed. The choice of risk evaluation method has been made for the management of maintenance of elements of the system taking into account good maritime practice, ICM code, regulations of classification societies and international maritime organizations. Studies on possibilities of extending operational time of the engine from the main power system using risk analysis with the Expert Method have been presented. On the basis of the results of studies, applicability of the Expert Method for risk analysis on ships has been shown.
Źródło:
Zeszyty Naukowe Akademii Morskiej w Szczecinie; 2013, 36 (108) z. 2; 5-12
1733-8670
2392-0378
Pojawia się w:
Zeszyty Naukowe Akademii Morskiej w Szczecinie
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Research on improving low-frequency oscillation characteristics of wind power grid-connected power system with doubly-fed wind generator based on virtual impedance power system stabilizer
Autorzy:
He, Ping
Zhu, Yongliang
Li, Qiuyan
Fan, Jiale
Tao, Yukun
Powiązania:
https://bibliotekanauki.pl/articles/27309939.pdf
Data publikacji:
2023
Wydawca:
Polska Akademia Nauk. Czasopisma i Monografie PAN
Tematy:
doubly-fed induction wind turbine
grid-connected wind power
low frequency oscillation
power system stabilizer
virtual impedance
Opis:
The grid integration of large-scale wind power will alter the dynamic characteristics of the original system and the power distribution among synchronous machines. Meanwhile, the interaction between wind turbines and synchronous machines will affect the damping oscillation characteristics of the system. The additional damping control of traditional synchronous generators provides an important means for wind turbines to enhance the damping characteristics of the system. To improve the low frequency oscillation characteristics of wind power grid-connected power systems, this paper adds a parallel virtual impedance link to the traditional damping controller and designs a DFIG-PSS-VI controller. In the designed controller, the turbine active power difference is chosen as the input signal based on residual analysis, and the output signal is fed back to the reactive power control loop to obtain the rotor voltage quadrature component. With DigSILENT/PowerFactory, the influence of the controller parameters is analyzed. In addition, based on different tie-line transmission powers, the impact of the controller on the low-frequency oscillation characteristics of the power system is examined through utilizing the characteristic root and time domain simulation analysis.
Źródło:
Archives of Electrical Engineering; 2023, 72, 3; 811--826
1427-4221
2300-2506
Pojawia się w:
Archives of Electrical Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Calculation of interval damping ratio under uncertain load in power system
Autorzy:
Xing, J.
Chen, C.
Wu, P.
Powiązania:
https://bibliotekanauki.pl/articles/201058.pdf
Data publikacji:
2012
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
power system
low frequency oscillation
interval load
interval damping ratio
successive linear programming method
Opis:
The problem of small-signal stability considering load uncertainty in power system is investigated. Firstly, this paper shows attempts to create a nonlinear optimization model for solving the upper and lower limits of the oscillation mode’s damping ratio under an interval load. Then, the effective successive linear programming (SLP) method is proposed to solve this problem. By using this method, the interval damping ratio and corresponding load states at its interval limits are obtained. Calculation results can be used to evaluate the influence of load variation on a certain mode and give useful information for improvement. Finally, the proposed method is validated on two test systems.
Źródło:
Bulletin of the Polish Academy of Sciences. Technical Sciences; 2012, 60, 1; 151-158
0239-7528
Pojawia się w:
Bulletin of the Polish Academy of Sciences. Technical Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Management in developing power system
Zarządzanie w rozwijającym się systemie elektroenergetycznym
Autorzy:
Zieliński, J. S.
Powiązania:
https://bibliotekanauki.pl/articles/324963.pdf
Data publikacji:
2016
Wydawca:
Politechnika Śląska. Wydawnictwo Politechniki Śląskiej
Tematy:
management information system
renewable energy source
Smart Grid
microgrid
informatyczny system zarządzania
odnawialne źródła energii
sieci inteligentne
mikrosieci
Opis:
Development of power system influence on management information system is the main aim of the article. Starting from the general review of hierarchical information system in power, changes in its (and in management information) systems implied by injection of renewable energy sources are discussed.
Celem artykułu jest przedstawienie wpływu rozwijającego się systemu elektroenergetycznego na system informatyczny zarządzania. Przedstawiono ogólne informacje o hierarchicznym systemie informacyjnym zarządzania i omówiono zmiany w systemie informatycznym zarządzania wywołane wprowadzeniem odnawialnych źródeł energii.
Źródło:
Zeszyty Naukowe. Organizacja i Zarządzanie / Politechnika Śląska; 2016, 97; 343-349
1641-3466
Pojawia się w:
Zeszyty Naukowe. Organizacja i Zarządzanie / Politechnika Śląska
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Computer simulation of electromagnetic interference from railway electronic power system harmonics
Autorzy:
Gavrilyuk, V.
Zavgorodnij, A.
Myrgorodska, A.
Powiązania:
https://bibliotekanauki.pl/articles/393523.pdf
Data publikacji:
2009
Wydawca:
Polskie Stowarzyszenie Telematyki Transportu
Tematy:
zakłócenia elektromagnetyczne
linia toru
electromagnetic interference
track lines
Opis:
In this work a computer simulation was carried out for traction current harmonics distribution in rail lines generated by several locomotives in a feeder zone. Th e inductive and conductive interference in rail circuits was investigated for two AC rail tracks, as well as for diff erent types AC and DC parallel rail tracks.
Źródło:
Archives of Transport System Telematics; 2009, 2, 1; 33-37
1899-8208
Pojawia się w:
Archives of Transport System Telematics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Reliability evaluation of renewable energy-based power system containing energy storage
Autorzy:
Ghaeedi, A.
Noroozi, E.
Powiązania:
https://bibliotekanauki.pl/articles/103047.pdf
Data publikacji:
2016
Wydawca:
Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:
reliability evaluation
renewable resources
vanadium redox batteries
fuzzy clustering method
Opis:
In recent years, renewable energy based power plants, especially wind and solar farms are increasingly installed and operated for electric power generation. Uncertainty nature associated to the generated power of these power plants, arisen from variability of wind speed or solar radiation, effects on different aspects of power system such as reliability, operation, dynamic and so on. Energy storages in connection with renewable power plants can reduce the variability and uncertainty nature of these renewable resources. In recent years the flow batteries such as vanadium redox (VR) with large capacities are developed and so in this paper effect of this largecapacity energy storages on the reliability performance of power system containing large-scale wind and photovoltaic (PV) farms are investigated. The renewable energy-based power plants and also energy storages are different from conventional units, so, for study of power system containing these resources new methods and techniques must be developed. To this end in this paper for reliability evaluation of renewable-energy based power system containing energy storage, an analytical approach is proposed. This approach can be employed both in planning and also operation studies of the power system when large scale wind and photovoltaic farms with energy storages exist. Data associated to wind speed of Manjil and solar radiation of Jask regions both in Iran are utilized for studying the reliability evaluation of RBTS and also IEEERTS in planning phase.
Źródło:
Advances in Science and Technology. Research Journal; 2016, 10, 32; 198-205
2299-8624
Pojawia się w:
Advances in Science and Technology. Research Journal
Dostawca treści:
Biblioteka Nauki
Artykuł
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:
Operational verification of a ship main power system element choice : case study
Autorzy:
Adamkiewicz, Andrzej
Powiązania:
https://bibliotekanauki.pl/articles/245251.pdf
Data publikacji:
2019
Wydawca:
Instytut Techniczny Wojsk Lotniczych
Tematy:
ship main power system
turbo-charging system
operational parameters
main engine
ship propeller
Opis:
The article refers to results and conclusions on post-emergency repairs of a turbo-charging system of a DEUTZ engine of the SBV 8M 628 type of 1715 kW – the main power unit of a cement carrier. The failure of the turbocharger led to severing of a part of the exhaust outlet valve head. In order to determine the cause of the turbocharger fault, parametric identification of the reference state of the turbocharging system interacting with the ship main power engine has been carried out. The post-emergency servicing of the turbocharger comprised mounting a new blade rim of expansive instruments of smaller capacity than the so far used. Control measurement results of the power system after the replacement of the turbocharger turbine nozzle have been presented. Limitations of correct engine operation have been noted in the range of maximum load with continuous power (MCR). A range of corrective maintenance servicing of fuel equipment has been presented. Using the values of measured torque at the propeller shaft, incorrect interaction between the shaft and the main engine has been noted. A new propeller, adequate to the design operational parameters of the engine characteristics, has been chosen and mounted. The correctness of turbine expansive instrument replacement has been verified by correct interaction between the elements of the power system: propeller – main engine – turbocharging system. Thus, a wider range of economically acceptable ship operation has been obtained.
Źródło:
Journal of KONES; 2019, 26, 4; 7-14
1231-4005
2354-0133
Pojawia się w:
Journal of KONES
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Power system frequency estimation algorithm for electric energy metering of nonlinear loads
Autorzy:
Peng, Z.
Hong-Bin, L.
Powiązania:
https://bibliotekanauki.pl/articles/220639.pdf
Data publikacji:
2012
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
frequency estimation
power systems
wavelet transforms
Opis:
In this paper, a discrete wavelet transform (DWT) based approach is proposed for power system frequency estimation. Unlike the existing frequency estimators mainly used for power system monitoring and control, the proposed approach is developed for fundamental frequency estimation in the field of energy metering of nonlinear loads. The characteristics of a nonlinear load is that the power signal is heavily distorted, composed of harmonics, inter-harmonics and corrupted by noise. The main idea is to predetermine a series of frequency points, and the mean value of two frequency points nearest to the power system frequency is accepted as the approximate solution. Firstly the input signal is modulated with a series of modulating signals, whose frequencies are those frequency points. Then the modulated signals are decomposed into individual frequency bands using DWT, and differences between the maximum and minimum wavelet coefficients in the lowest frequency band are calculated. Similarities among power system frequency and those frequency points are judged by the differences. Simulation results have proven high immunity to noise, harmonic and inter-harmonic interferences. The proposed method is applicable for real-time power system frequency estimation for electric energy measurement of nonlinear loads.
Źródło:
Metrology and Measurement Systems; 2012, 19, 2; 307-320
0860-8229
Pojawia się w:
Metrology and Measurement Systems
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Zjawiska rezonansu w układach zasilania bezprzewodowego
O resonance phenomenon wireless power system
Autorzy:
Filipiak, M.
Powiązania:
https://bibliotekanauki.pl/articles/376254.pdf
Data publikacji:
2016
Wydawca:
Politechnika Poznańska. Wydawnictwo Politechniki Poznańskiej
Tematy:
zasilanie bezprzewodowe
dobroć
sprawność układów
kompensacja indukcyjności
Opis:
W artykule zaprezentowano perspektywy zastosowania bezprzewodowego zasilania urządzeń elektronicznych. Krótko opisano zalety stosowania tej technologii wraz z jej zasadą działania i budową typowych układów stosowanych w urządzeniach codziennego użytku. Przedstawiono dwa rodzaje układów rezonansowych stosowanych do bezprzewodowego przesyłu energii. Zaprezentowano zalety i wady stosowania każdego z tych układów. Przedstawiono również analizę impedancyjną i sprawnościową układów bezprzewodowego przesyłu energii elektrycznej. Charakterystyki sprawnościowe przedstawiono w zależności od kilku parametrów w formie trójwymiarowej. Wykazano minimalną dobroć układu rezonansowego umożliwiającą osiągnięcie wysokiej sprawności układu przy małym sprzężeniu między cewkami uzwojenia pierwotnego i wtórnego. Porównano dwa badane obwody i wyznaczono obszary zastosowań każdego z nich. Określono trudności związane z utrzymaniem obwodu w rezonansie oraz ograniczeniem strat.
The article presents the perspective of the use of wireless power electronic devices. Briefly describes the advantages of using this technology with its operating principle and construction of typical systems used in the devices of everyday use. Are two types of resonant circuits used for wireless transmission of energy. They presented the advantages and disadvantages of using each of these systems. An analysis of impedance and agility circuits wireless transmission of electricity. 'Performances are shown depending on several parameters in the three-dimensional form. It has been demonstrated minimal goodness resonance system, achieving high system efficiency at low coupling between the coils primary and secondary windings. We compared the two tested circuits and designated areas of application for each of them. Identified several difficulties associated with maintaining the circuit in resonance and reducing losses.
Źródło:
Poznan University of Technology Academic Journals. Electrical Engineering; 2016, 86; 437-445
1897-0737
Pojawia się w:
Poznan University of Technology Academic Journals. Electrical Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Application of affine NARMA model to design of adaptive power system stabilizer
Autorzy:
Zhou, J.
Ke, D.
Chung, C. Y.
Sun, Y.
Powiązania:
https://bibliotekanauki.pl/articles/327256.pdf
Data publikacji:
2018
Wydawca:
Polska Akademia Nauk. Polskie Towarzystwo Diagnostyki Technicznej PAN
Tematy:
adaptive control
affine
NARMA model
neural network
power system stabilizer
PSS
sterowanie adaptacyjne
sieć neuronowa
stabilizator systemu zasilania
Opis:
An affine nonlinear autoregressive moving average (NARMA) model is derived from the neural network (NN) based general NARMA model in this paper, by using Taylor series expansion. The predictive error of this affine NARMA model will be quite acceptable, at least for the control purpose, if the amplitude of control input is properly limited. Therefore, an adaptive control scheme based on this model is proposed and applied to the design of adaptive power system stabilizer (APSS) since the amplitude of PSS output is usually well limited. The feature of this control scheme is that the control input can be online analytically obtained. Thus, comparing to the traditional NN based APSS (TAPSS), the affine NARMA model based APSS (AAPSS) does not need the training of a NN as neuro-controller, which may be a troublesome and time consuming step during the design. Moreover, the AAPSS can generally perform better than the TAPSS. Simulation studies on a single machine infinite bus system and a multi-machine system show that the AAPSSs can consistently well perform to damp electromechanical oscillations in the systems over a wide range of operating conditions.
Źródło:
Diagnostyka; 2018, 19, 2; 105-114
1641-6414
2449-5220
Pojawia się w:
Diagnostyka
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Design and testing of power system protection functions using Simulink and EMTP
Autorzy:
Sawko, P.
Hill, K.
Evans, G.
Powiązania:
https://bibliotekanauki.pl/articles/410599.pdf
Data publikacji:
2013
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
model based design
test automation
Simulink and EMTP
Opis:
This paper presents how simulation of power system behaviour under different disturbances can be used to test protection algorithms. A method for co-simulation using Electromagnetic Transient Program (EMTP) and Simulink is presented along with the procedure used for testing protection algorithms against different power system waveforms. The advantages of model based design are described showing how a realistic model of protection relay can be designed and how individual components are integrated.
Źródło:
Present Problems of Power System Control; 2013, 4; 51-65
2084-2201
Pojawia się w:
Present Problems of Power System Control
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Hierarchical cycles in the modern power system – exergy analysis under partial loads
Autorzy:
Kowalczyk, T.
Ziółkowski, P.
Kornet, S.
Powiązania:
https://bibliotekanauki.pl/articles/175484.pdf
Data publikacji:
2015
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
hierarchical cycles
partial loads
combine cycles
Opis:
The aim of this paper is to investigate thermodynamic efficiency of hierarchical thermodynamic cycles under partial loads by using of exergy analysis. Advanced hierarchical cycles are composed of few energy conversion systems, which can be powered by several different sources of energy jointly. This kind of cooperation gives opportunities to provide high efficient and clean conversion of fossil fuels to electricity. Moreover, power plant consisting of few traditional power system gives new possibilities of optimization under partial loads.
Źródło:
Transactions of the Institute of Fluid-Flow Machinery; 2015, 129; 3-23
0079-3205
Pojawia się w:
Transactions of the Institute of Fluid-Flow Machinery
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Multi-sourced power system restoration strategy based on modified Prim’s algorithm
Autorzy:
Łukaszewski, Artur
Nogal, Łukasz
Powiązania:
https://bibliotekanauki.pl/articles/2086893.pdf
Data publikacji:
2021
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
self-healing grid
micro-grid
reconfiguration
greedy algorithms
graph theory
simulations
Prim’s algorithm
siatka samoleczenia
mikrosiatka
rekonfiguracja
algorytmy zachłanne
teoria grafów
symulacje
algorytm Prima
Opis:
Self-healing grids are one of the most developing concepts applied in electrical engineering. Each restoration strategy requires advanced algorithms responsible for the creation of local power systems. Multi-agent automation solutions dedicated for smart grids are mostly based on Prim’s algorithm. Graph theory in that field also leaves many problems unsolved. This paper is focused on a variation of Prim’s algorithm utility for a multi-sourced power system topology. The logic described in the paper is a novel concept combined with a proposal of a multi-parametrized weight calculation formula representing transmission features of energy delivered to loads present in a considered grid. The weight is expressed as the combination of three elements: real power, reactive power, and real power losses. The proposal of a novel algorithm was verified in a simulation model of a power system. The new restoration logic was compared with the proposal of the strategy presented in other recently published articles. The novel concept of restoration strategy dedicated to multi-sourced power systems was verified positively by simulations. The proposed solution proved its usefulness and applicability.
Źródło:
Bulletin of the Polish Academy of Sciences. Technical Sciences; 2021, 69, 5; e137942, 1--12
0239-7528
Pojawia się w:
Bulletin of the Polish Academy of Sciences. Technical Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Ensemble neural network approach for accurate load forecasting in a power system
Autorzy:
Siwek, K.
Osowski, S.
Szupiluk, R.
Powiązania:
https://bibliotekanauki.pl/articles/907659.pdf
Data publikacji:
2009
Wydawca:
Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:
sieć neuronowa
ślepa separacja sygnałów
prognozowanie obciążenia
neural network
blind source separation
ensemble of predictors
load forecasting
Opis:
The paper presents an improved method for 1-24 hours load forecasting in the power system, integrating and combining different neural forecasting results by an ensemble system. We will integrate the results of partial predictions made by three solutions, out of which one relies on a multilayer perceptron and two others on self-organizing networks of the competitive type. As the expert system we will apply different integration methods: simple averaging, SVD based weighted averaging, principal component analysis and blind source separation. The results of numerical experiments, concerning forecasting the hourly load for the next 24 hours of the Polish power system, will be presented and discussed. We will compare the performance of different ensemble methods on the basis of the mean absolute percentage error, mean squared error and maximum percentage error. They show a significant improvement of the proposed ensemble method in comparison to the individual results of prediction. The comparison of our work with the results of other papers for the same data proves the superiority of our approach.
Źródło:
International Journal of Applied Mathematics and Computer Science; 2009, 19, 2; 303-315
1641-876X
2083-8492
Pojawia się w:
International Journal of Applied Mathematics and Computer Science
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The impact of wind farms on active power losses in the power system
Autorzy:
Kut, Paweł
Powiązania:
https://bibliotekanauki.pl/articles/105273.pdf
Data publikacji:
2019
Wydawca:
Politechnika Rzeszowska im. Ignacego Łukasiewicza. Oficyna Wydawnicza
Tematy:
wind farm
power system
active power losses
elektroenergetyka
elektrownia wiatrowa
straty mocy
minimalizacja
Opis:
Increasing emission standards and European Union policy require investment in the renewable energy sector. An increasing amount of renewable energy sources, including wind farms, requires changes in the power system in countries whose energy is based on large system power plants, mostly coal-fired. Stricter share of renewable energy sources in energy mix, may improve the country’s security and ensure the diversification of fuels and the gradual independence of conventional fuels. Thanks to regulation possibilities of doubly-fed induction generators, which are equipped with a significant part of wind turbines, it is possible to obtain better electricity parameters. The location of energy sources near the receiving nodes has a positive effect on the active power losses in the power system. This article analyzes the impact of a 30 MW wind farm on the level of active power losses in the power system, taking into account the different power factor values with which the wind farm can work. Simulation were carried out using the Powerworld Simulation software.
Źródło:
Czasopismo Inżynierii Lądowej, Środowiska i Architektury; 2019, 66, 1; 45-55
2300-5130
2300-8903
Pojawia się w:
Czasopismo Inżynierii Lądowej, Środowiska i Architektury
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The impact of wind farms on active power losses in the power system
Autorzy:
Kut, Paweł
Powiązania:
https://bibliotekanauki.pl/articles/2065738.pdf
Data publikacji:
2019
Wydawca:
Politechnika Rzeszowska im. Ignacego Łukasiewicza. Oficyna Wydawnicza
Tematy:
wind farm
power system
active power losses
elektroenergetyka
elektrownia wiatrowa
straty mocy
minimalizacja
Opis:
Increasing emission standards and European Union policy require investment in the renewable energy sector. An increasing amount of renewable energy sources, including wind farms, requires changes in the power system in countries whose energy is based on large system power plants, mostly coal-fired. Stricter share of renewable energy sources in energy mix, may improve the country’s security and ensure the diversification of fuels and the gradual independence of conventional fuels. Thanks to regulation possibilities of doubly-fed induction generators, which are equipped with a significant part of wind turbines, it is possible to obtain better electricity parameters. The location of energy sources near the receiving nodes has a positive effect on the active power losses in the power system. This article analyzes the impact of a 30 MW wind farm on the level of active power losses in the power system, taking into account the different power factor values with which the wind farm can work. Simulation were carried out using the Powerworld Simulation software.
Źródło:
Czasopismo Inżynierii Lądowej, Środowiska i Architektury; 2019, 66, 1; 45--55
2300-5130
2300-8903
Pojawia się w:
Czasopismo Inżynierii Lądowej, Środowiska i Architektury
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Ocena jakości zasilania odbiorników trójfazowych
Power quality assessment of three-phase power system
Autorzy:
Ładniak, Leszek
Powiązania:
https://bibliotekanauki.pl/articles/269023.pdf
Data publikacji:
2019
Wydawca:
Politechnika Gdańska. Wydział Elektrotechniki i Automatyki
Tematy:
obwód trójfazowy
teoria mocy
jakość zasilania
analiza tensorowa
analiza macierzowa
multiphase power system
power theory
power quality
tensor analysis
matrix analysis
Opis:
W artykule opisano metodę oceny warunków zasilania odbiorników trójfazowych bazującą na tensorowym opisie chwilowych zmian mocy w punkcie przyłączeniowym. Bazując na dwóch ortogonalnych składowych mocy odbiornika wielofazowego istnieje możliwość oceny zarówno jakości zasilania, jak i zniekształceń spowodowanych niesymetrią obciążenia oraz nieliniowością elementów obciążenia. Analiza chwilowych zmian składowych mocy odbiornika trójfazowego pozwala na identyfikację kierunku przepływu energii oraz wyznaczenie globalnych wskaźników jakości zasilania. Ponieważ metoda bazuje na pomiarze chwilowych zmian wartości napięć i prądów na zaciskach badanego układu może być wykorzystywana do oceny zniekształceń mocy spowodowanych przez różnego rodzaju układy przekształtnikowe.
The electrical power quality in three-phase power system is a very important problem because a number and power of nonlinear loads is growing years to years. Problems caused by poor power quality have great adverse not only technical but also economical. For this reason, both energy suppliers and energy consumers are looking for new methods to solve energy quality problems and power compensation techniques. This paper presents a new approach for power quality analysis using the matrix and tensor theory. Using those mathematical tools is possible describe a time changes of voltages, currents and power at the terminals of a three-phase circuit as second rank tensors. Each of these tensors has a physical interpretation and can be split into a symmetrical and antisymmetric tensor. One of them describes the energy carried by the circuit, but the other one describes the rate of change of energy stored in the circuit elements. One of them describe the transfer energy by the circuit and second one describes the speed of changes the energy stored in the elements of circuit. This method can be used to describe behavior of multiphase circuit in transient and steady state condition. It is powerful tool for monitoring power quality problems generated in industrial plants where are non-linear and time-variants loads.
Źródło:
Zeszyty Naukowe Wydziału Elektrotechniki i Automatyki Politechniki Gdańskiej; 2019, 67; 61-64
1425-5766
2353-1290
Pojawia się w:
Zeszyty Naukowe Wydziału Elektrotechniki i Automatyki Politechniki Gdańskiej
Dostawca treści:
Biblioteka Nauki
Artykuł
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
Artykuł
Tytuł:
Power System Transient Stability Case Study: A Power Sub-Station Plant in Sudan
Autorzy:
Abbas, Asma
Kamal, Ramadan Doud
Elmustafa, Sayed Ali Ahmed
Powiązania:
https://bibliotekanauki.pl/articles/1193487.pdf
Data publikacji:
2021
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
Dynamic Stability
GARRI power stations
Swing Equation
Transient Stability
power angle
synchronism
Opis:
Power system stability is defined by the tendency of the energy system to develop recovery forces equal or greater than the disturbing forces to maintain a stable equilibrium state. In general, power system stability problems are usually divided into two parts, steady state and transient state. An extension of steady-state stability is dynamic stability. Transient stability deals with the effects of large disturbances such as malfunctions, sudden line interruptions, and sudden application or load removal. This research is presents load angle method to transient stability problem for multi-machine system. The ETAP program is used to simulate the above method to study transient stability. A sub-station plant in Khartoum (GARRI) with four generation sections (1, 2 and 4) has been taken as a case study. The simulation result shows that when a single line-ground fault occurs at main busbar and cleared at time t = 0.4 sec the system is stable, in case 2, when the same fault cleared at t = 3 sec the system become unstable.
Źródło:
World Scientific News; 2021, 158; 267-284
2392-2192
Pojawia się w:
World Scientific News
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Particle filter in power system state estimation – bad measurement data and branch disconnection
Autorzy:
Kozierski, P.
Lis, M.
Owczarkowski, A.
Horla, D.
Powiązania:
https://bibliotekanauki.pl/articles/141558.pdf
Data publikacji:
2015
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
bad data
branch disconnection measurement errors
particle filter
power system
state estimation
Opis:
An approach to power system state estimation using a particle filter has been proposed in the paper. Two problems have been taken into account during research, namely bad measurements data and a network structure modification with rapid changes of the state variables. For each case the modification of the algorithm has been proposed. It has also been observed that anti-zero bias modification has a very positive influence on the obtained results (few orders of magnitude, in comparison to the standard particle filter), and additional calculations are quite symbolic. In the second problem, used modification also improved estimation quality of the state variables. The obtained results have been compared to the extended Kalman filter method.
Źródło:
Archives of Electrical Engineering; 2015, 64, 2; 237-248
1427-4221
2300-2506
Pojawia się w:
Archives of Electrical Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Application of Data Communication to the Detection and Correction of Power System Faults
Autorzy:
Recioui, A.
Lograda, M.
Chettah, K.
Powiązania:
https://bibliotekanauki.pl/articles/1031503.pdf
Data publikacji:
2017-09
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
power system faults
data communication
fault detection
symmetrical components
LABVIEW
Opis:
Data communication is an important part in modern industrial processes and is necessary in automation, monitoring, and protection purposes. This paper aims at designing a real time communication between two computers for interchanging the state of a three phase circuit to emulate a transmission line protection system in power substation. The circuit designed in Proteus ISIS is based on "symmetrical component theory" and the algorithm for exchanging data between two computers is built using TCP/IP protocol in LABVIEW environment. The application consists of monitoring and controlling three phase lines by sending the data collected to one of the computers and sending the commands back to trip relays if any fault is detected. The purpose is to prevent the propagation of this fault and to connect other sources to maintain the flow of power to the load.
Źródło:
Acta Physica Polonica A; 2017, 132, 3; 819-821
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Heat and power system as an independent source of electric power. Case study
Autorzy:
Grebski, Wes
Ulewicz, Robert
Powiązania:
https://bibliotekanauki.pl/articles/27315532.pdf
Data publikacji:
2022
Wydawca:
STE GROUP
Tematy:
PBL
energy
Combined Heat and Power (CHP)
student project
learning experience
Opis:
The article describes a student capstone design project completed by a team of five students and implemented by a resort and casino in Northeastern Pennsylvania (NEPA). This project was completed within the framework of project-based learning (PBL). Students had the opportunity to apply the knowledge that they learned in the classroom in a real-world application. Students also had the opportunity to work as a team which was supervised by the faculty. The outcome of the project provided valuable experience in creating of grid, a reliable source of energy. The heat generated as a by-product was used for the purpose of heating hot water and a swimming pool as well as space heating for the hotel and casino during the winter. In the summertime the excessive amount of heat was used to dehumidify the air in the hotel and casino. Dehumidifying the air increased the level of comfort in the hotel and casino as well as in the enclosed swimming pools area. The article is focusing on the cost effectiveness of the off-grid heat-and-power solution. The net present value and internal rate of return as well as the payback time were calculated.
Źródło:
Management Systems in Production Engineering; 2022, 3 (30); 262--268
2299-0461
Pojawia się w:
Management Systems in Production Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Power System State Estimation Accuracy Enhancement Using Temperature Measurements of Overhead Line Conductors
Autorzy:
Wydra, M.
Kacejko, P.
Powiązania:
https://bibliotekanauki.pl/articles/220756.pdf
Data publikacji:
2016
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
power systems
state estimation
transmission line
conductor temperature measurement
dynamic line rating
Opis:
Power system state estimation is a process of real-time online modeling of an electric power system. The estimation is performed with the application of a static model of the system and current measurements of electrical quantities that are encumbered with an error. Usually, a model of the estimated system is also encumbered with an uncertainty, especially power line resistances that depend on the temperature of conductors. At present, a considerable development of technologies for dynamic power line rating can be observed. Typically, devices for dynamic line rating are installed directly on the conductors and measure basic electric parameters such as the current and voltage as well as non-electric ones as the surface temperature of conductors, their expansion, stress or the conductor sag angle relative to the plumb line. The objective of this paper is to present a method for power system state estimation that uses temperature measurements of overhead line conductors as supplementary measurements that enhance the model quality and thereby the estimation accuracy. Power system state estimation is presented together with a method of using the temperature measurements of power line conductors for updating the static power system model in the state estimation process. The results obtained with that method have been analyzed based on the estimation calculations performed for an example system - with and without taking into account the conductor temperature measurements. The final part of the article includes conclusions and suggestions for the further research.
Źródło:
Metrology and Measurement Systems; 2016, 23, 2; 183-192
0860-8229
Pojawia się w:
Metrology and Measurement Systems
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-50 z 1368

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