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Wyświetlanie 1-10 z 742
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:
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:
Identification and interpretation of the development of the domestic electrical power system from the point of view unmanned manufactories
Autorzy:
Tchórzewski, J.
Powiązania:
https://bibliotekanauki.pl/articles/97573.pdf
Data publikacji:
2012
Wydawca:
Politechnika Poznańska. Wydawnictwo Politechniki Poznańskiej
Tematy:
electrical power system
DEPS system
domestic electrical power system
Opis:
In case of studying regularities in the development of the domestic electrical power system (DEPS) from the point of view of unmanned factories, it is not possible to develop a model using the modelling method. Therefore, identification of development was conducted using the arx method as well as the MATLAB environment and the System Identification Toolbox. For the designed research experiment, assuming one output variable and 14 input variables, MISO models were obtained in the form of matrices th. Th models were expressed in the form of models of development as a function of long time θ, and then, interpretation of its coefficients as basic elements of matrices th was conducted. The results of the analysis of model coefficients influence on the value of the output quantity y(θ) - the total achievable power output for power plants (maximum output) were presented. Studying regularities in the DEPS development was limited to studying the degree of changes in the internal organization of the system and changes in the level of control, and resulted in obtaining a catalogue of moving stationary models in state space (ss). For this purpose, th models were transformed into ss models, and then changes in long time θ of matrices A and B as well as their elements were studied. Ss model was written in the form of the model of state variables development, followed by the interpretation of its coefficients as basic elements of matrices A and B. Other state variables were also interpreted as elements of the DES development vector.
Źródło:
Computer Applications in Electrical Engineering; 2012, 10; 283-298
1508-4248
Pojawia się w:
Computer Applications in Electrical Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Searching of regularities in the development of electrical power system. Part I - Identification and evaluation
Autorzy:
Tchórzewski, J.
Powiązania:
https://bibliotekanauki.pl/articles/97638.pdf
Data publikacji:
2011
Wydawca:
Politechnika Poznańska. Wydawnictwo Politechniki Poznańskiej
Tematy:
electrical power system
EPS
Opis:
The paper contains selected results of research on identification of the development of the electrical power system, presented in the table in the form of development models th, matrices of state variables and characteristic polynomials. An algorithm of development was also presented along with assumptions concerning the evaluation and examination of regularities in development.
Źródło:
Computer Applications in Electrical Engineering; 2011, 9; 85-101
1508-4248
Pojawia się w:
Computer Applications in Electrical Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A power constraint index to rank and group critical contingencies based on sensitivity factors
Autorzy:
Arenas-Crespo, O.
Candelo, J. E.
Powiązania:
https://bibliotekanauki.pl/articles/141453.pdf
Data publikacji:
2018
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
contingency ranking
critical contingencies
power system operation
power system planning
sensitivity power factors
Opis:
Finding the most critical contingencies in a power system is a difficult task as multiple evaluations of load and generation scenarios are needed. This paper presents a mathematical formulation for selecting, ranking, and grouping the most critical N-1 net- work contingencies, based on the calculation of a Power Constraint Index (PCI) obtained from the Outage Transfer Distribution Factors (OTDF). The results show that the PCI is only affected by the impedance parameter of the transmission network, the topology, and the location of all generators. Other methods, such as the Performance Index (PI) and the Overload Index (OL) are affected by the power generation and demand variations. The proposed mathematical formulation can be useful to accelerate the calculation of other methods that evaluate contingencies in power system planning and operation. Furthermore, the fast calculation of indices makes it suitable for online evaluation and classification of multiple events considering the current topology. The results showed that the proposed algorithm easily selected and ranked the expected contingencies, with the highest values of the index corresponding to the most critical events. In the filtering process, the computational calculation time improved without losing the robustness of the results.
Źródło:
Archives of Electrical Engineering; 2018, 67, 2; 247--261
1427-4221
2300-2506
Pojawia się w:
Archives of Electrical Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Modeling of transient states in the start-up path during voltage and start-up power application
Autorzy:
Grządzielski, Ireneusz
Olejnik, Bartosz
Zakrzewski, Mikołaj
Powiązania:
https://bibliotekanauki.pl/articles/949916.pdf
Data publikacji:
2019
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
blackout
electric power system
restoration power
Opis:
During a blackout, after the post-disaster collapse of an electric power system (EPS), units of thermal power plants should switch-over to the house load operation mode (PPW). However, regarding the dynamics of a post-disaster blackout process, many units can be in forced outage Therefore, restart of these units from the start-up sources with a self-start capability is necessary. The Transmission Network Code in force imposes periodic tests and system tests for such sources. Any system test must be preceded and followed by simulation investigations in which the possibilities: (1) to bring voltage to the started-up power plant by a starting path and (2) to activate the highest-power auxiliaries (PW) of the unit being started-up are evaluated. In the paper, chosen results of simulative investigations of the transient phenomena in the starting path from the hydroelectric power plant of Włocławek (HPP Włocławek) to the thermal power plant of Pątnów (w (TPP Pątnów), related to the system test conducted in September 2017 have been presented.
Źródło:
Archives of Electrical Engineering; 2019, 68, 4; 749-769
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:
Searching of regularities in the development of electrical power system. Part II - Analysis and interpretation of changes
Autorzy:
Tchórzewski, J.
Powiązania:
https://bibliotekanauki.pl/articles/97425.pdf
Data publikacji:
2011
Wydawca:
Politechnika Poznańska. Wydawnictwo Politechniki Poznańskiej
Tematy:
electrical power system
EPS
Opis:
The paper contains selected results of research on searching of regularities of development of the electrical power system. Analysis and interpretation of development were also presented on the example of the output of electrical power consumption type (y2) and 14 inputs (years 1946-2007). This direction of research also includes seeking the interpretation of the EPS development using Evans root line.
Źródło:
Computer Applications in Electrical Engineering; 2011, 9; 102-111
1508-4248
Pojawia się w:
Computer Applications in Electrical Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
An overview on reliability assessment in power systems using CI approaches
Autorzy:
Olajuyin, Elijah Adebayo
Olulope, Paul Kehinde
Fasina, Emmanuel Taiwo
Powiązania:
https://bibliotekanauki.pl/articles/2086689.pdf
Data publikacji:
2022
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
computational intelligence
power system
Opis:
A Computational Intelligence (CI) approach is one of the main trending and potent data dealing out and processing instruments to unravel and resolve difficult and hard reliability crisis and it takes an important position in intelligent reliability analysis and management of data. Nevertheless, just few little broad reviews have recapitulated the current attempts of Computational Intelligence (CI) in reliability assessment in power systems. There are many methods in reliability assessment with the aim to prolong the life cycles of a system, to maximize profit and predict the life cycle of assets or systems within an organization especially in electric power distribution systems. Sustaining an uninterrupted electrical energy supply is a pointer of affluence and nationwide growth. The general background of reliability assessment in power system distribution using computational intelligence, some computational intelligence techniques, reliability engineering, literature reviews, theoretical or conceptual frameworks, methods of reliability assessment and conclusions was discussed. The anticipated and proposed technique has the aptitude to significantly reduce the needed period for reliability investigation in distribution networks because the distribution network needs an algorithm that can evaluate, assess, measure and update the reliability indices and system performance within a short time. It can also manage outages data on assets and on the entire system for quick and rapid decisions making as well as can prevent catastrophic failures. Those listed above would be taken care of if the proposed method is utilized. This overview or review may be deemed as valuable assistance for anybody doing research.
Źródło:
Archives of Electrical Engineering; 2022, 71, 2; 425--443
1427-4221
2300-2506
Pojawia się w:
Archives of Electrical Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Energy consumed by valves in conventional water systems and the application of a power-decentralization system
Autorzy:
Fu, Y.
Cai, Y.
Zhang, Z.
Wu, K.
Powiązania:
https://bibliotekanauki.pl/articles/1955328.pdf
Data publikacji:
2006
Wydawca:
Politechnika Gdańska
Tematy:
power-centralized system
power-decentralized system
valves' power consumption
valve
Opis:
The power consumption by valves of a conventional (i.e. power-centralized) water system is analyzed on the example of a water heating system in order to evaluate the extent of energy savings achievable in a power-decentralized system. The configuration and appli-cation of a power-decentralized system is briefly discussed.
Źródło:
TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk; 2006, 10, 3; 311-320
1428-6394
Pojawia się w:
TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-10 z 742

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