Temat: distributed control

Skocz do pozycji: 1.

Tytuł:: Towards optimal operation control in rural low voltage microgrids
Autorzy:: Parol, M.
Rokicki, Ł.
Parol, R.
Tematy:: microgrids
centralized control
distributed control
rural areas; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Powiązania:: https://bibliotekanauki.pl/articles/200413.pdf Link otwiera się w nowym oknie
Opis:: The paper raises the issue of controlling rural low voltage microgrids in an optimal manner. The impact of different criterion functions, related to the amount of energy exchanged with the distribution system operator network, the level of active power losses, the amount of energy generated by different energy sources and the value of financial performance measures regarding the microgrid operation, on the choice of operating points for devices suggested by the optimization algorithm has been analyzed. Both island and synchronous microgrid operation modes are being considered. We propose two variants of the optimization procedure: the first one is based on the particle swarm optimization algorithm and centralized control logic, and the second one takes advantage of the decentralized approach and Monte Carlo methods. A comparison of the simulation results for two sample rural microgrids, obtained for different objective functions, microgrid operation modes and optimization procedure variants, with the use of prepared algorithm implementations, has been provided. The results show that the proper choice of an objective function can have a crucial impact on the optimization algorithm’s behavior, the choice of operating points and, as a consequence, on microgrid behavior as well. The choice of the proper form of the objective function is the responsibility of the person in charge of both the microgrid itself and its operation. This paper can contribute towards making correct decisions in this area. Generally, slightly better results have been achieved for the centralized control mode of operation. Nevertheless, the results also suggest that in many cases the approach based on distributed logic can return results that are better or sufficiently close to the ones provided by the centralized and more sophisticated approach.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: Multi-agent system inspired distributed control of a serial-link robot
Autorzy:: Soumya, S.
Guruprasad, K. R.
Tematy:: model-based control
distributed control
manipulator control; Pokaż więcej
Wydawca:: Sieć Badawcza Łukasiewicz - Przemysłowy Instytut Automatyki i Pomiarów
Powiązania:: https://bibliotekanauki.pl/articles/384673.pdf Link otwiera się w nowym oknie
Opis:: Inspired by the multi-agent systems, we propose a model-based distributed control architecture for robotic manipulators. Here, each of the joints of the manipulator is controlled using a joint level controller and these controllers account for the dynamic coupling between the links by interacting among themselves. Apart from the reduced computational time due to distributed computation of the control law at the joint levels, the knowledge of dynamics is fully utilized in the proposed control scheme, unlike the decentralized control schemes proposed in the literature. While the proposed distributed control architecture is useful for a general serial-link manipulator, in this paper, we focus on planar manipulators with revolute joints. We provide a simple model-based distributed control scheme as an illustration of the proposed distributed model-based control architecture. Based on this scheme, distributed model-based controller has been designed for a planar 3R manipulator and simulations results are presented to demonstrate that the manipulator successfully tracks the desired trajectory.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 3.

Tytuł:: Sieci komputerowe w rozproszonych systemach automatyki
Computer networks in distributed control systems
Autorzy:: Grandek, K.
Wrzuszczak, M.
Tematy:: sterowanie rozproszone
distributed control
field buses; Pokaż więcej
Wydawca:: Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Powiązania:: https://bibliotekanauki.pl/articles/153284.pdf Link otwiera się w nowym oknie
Opis:: W artykule przedstawiono zagadnienia projektowania sieci komputerowych w aplikacjach rozproszonych systemów automatyki. Jako praktyczne - przemysłowe rozwiązanie służy system PCD firmy Saia-Burgess. Instytut Automatyki i Informatyki PO współpracuje od 16 lat z przedstawicielem Saia-Burgess w Polsce a mianowicie z firmą SABUR.W laboratoriach Instytutu zainstalowanych jest 11 sterowników programowalnych PCD1, PCD2 i PCD4, które sterują modelami fizycznymi kilkunastu procesów przemysłowych i jednym obiektem rzeczywistym [1]. Sterowniki programowalne są połączone w podsieci i sieć komputerową przemysłową zbudowaną na bazie RS485, RS232 i TCP/IP. Jako jednostki programująco-serwisujące przyłączonych jest 11 stacji PC z środowiskiem narzędziowym PG5 v1.4 z połączeniem poprzez RS232, oraz 30 komputerów PC z komunikacją poprzez TCP/IP.
The paper deals with the design problems of computer networks in applications of distributed control and monitoring systems. As a case study the industrial system based on PCD solution of Saia Burgess PLCs and programming environment of PG5 v1.4 has been discussed. The Institute of Automatic Control and Computer Science of Opole University of Technology and Saia Burgess representative in Poland SABUR has been cooperating for 16 years. The system consists of 11 PCD1, PCD2 and PCD4 PLCs controlling some models of industrial plants and a real-life one linked with 30 PCs throughout a proprietary master- multi slaves SBus and the Ethernet segment with TCP/IP protocol stack..
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 4.

Tytuł:: Stabilization of beam parametric vibrations by means of distributed piezoelectric elements.
Autorzy:: Tylikowski, A.
Tematy:: active damping
parametric excitation
distributed control; Pokaż więcej
Wydawca:: Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
Powiązania:: https://bibliotekanauki.pl/articles/280230.pdf Link otwiera się w nowym oknie
Opis:: The paper concerns stabilization of an elastic beam subjected to a timedependent axial forcing. The direct Liapunov method is proposed to establish criteria for the almost sure stochastic stability of the unperturbed (trivial) solution of the structure with closed-loop control. We construct the Liapunov functional as a sum of the modified kinetic energy and elastic energy of the structure. An influence of damping in the finite bonding layer is described by the effective retardation time of the Voigt-Kelvin model. The distributed control is realized by the piezoelectric sensor and actuator, with changing widths, glued to the upper and lower beam surfaces, respectively. The paper is devoted to the stability analysis of the closed-loop system described by the stochastic partial differential equation without a finite-dimensional approach. The effective stabilization conditions implying the almost sure stability are the main results. A fluctuating axial force is modelled by the physically realizable ergodic process. The rate velocity feedback is applied to stabilize the panel parametric vibrations. Calculations are performed for the Gaussian process with given mean value and variance as well as for the harmonic process with amplitude A.
Praca dotyczy stabilizacji belki sprężystej poddanej działaniu siły ściskającej zależnej od czasu. Warunek prawie pewnej stateczności stochastycznej wyprowadzono za pomocą bezpośredniej metody Lapunowa. Jako funkcjonał Lapunowa przyjęto sumę zmodyfikowanej energii kinetycznej i energii potencjalnej belki. Tłumienie w warstwie łączącej elementy piezoelektryczne z belką opisano efektywnym współczynnikiem tłumienia modelu Voigta-kelvina. Sterowanie jest realizowane za pomocą rozłożonych piezoelektrycznych elementów pomiarowych i wykonawczych o zmiennej szerokości przyklejonych do powierzchni belki. Zasadniczym celem pracy jest analiza stabilności układu ciągłego ze sprzężeniem zwrotnym opisanym równaniem o pochodnych cząstkowych. Głównym wynikiem są efektywne warunki stabilizacji zapewniające prawie pewną stabilność stochastyczną belki. Zmienna siła modelowania jest jako fizycznie realizowalny stochastyczny proces ergodyczny. Prędkościowe sprzężenie zwrotne zapewnia stabilizację drgań parametrycznych. Obliczenia są przeprowadzone dla procesu Gaussowskiego o danej średniej i wariancji oraz procesu harmonicznego o danej amplitudzie.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 5.

Tytuł:: Effective approach to distributed optimal operation control in rural low voltage microgrids
Autorzy:: Parol, M.
Kapler, P.
Marzecki, J.
Parol, R.
Połecki, M.
Rokicki, Ł.
Tematy:: microgrids
optimal operation
distributed control
rural areas; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Powiązania:: https://bibliotekanauki.pl/articles/201003.pdf Link otwiera się w nowym oknie
Opis:: The paper raises the issue of optimizing the control of the rural low voltage microgrids. Microgrids can operate in a synchronous mode with grids of distribution system operators and in an island mode. We can distinguish two control strategies in microgrids: one approach based on centralized control logic, which is usually used, and another on decentralized control logic. In this paper we decided to present the approach based on the distributed control, combining the efforts of the distributed cooperative control and modified Monte Carlo optimization method. Special attention has been paid to the impact of the order of processing particular devices’ groups on results of optimization calculations. Moreover, different scenarios of behavior of the microgrid control system with respect to the communication loss have been also presented. The influence of the issue of continuity of communication between particular devices’ groups on the possibility of carrying out the optimization process has been investigated. Additionally, characteristics of power loads and generation of electricity from small renewable energy appearing in rural areas have been described and the sensitivity of the optimization algorithm to the changes of demanded power values and changes of values of power generated by renewable energy sources has been studied. We analyzed different objective functions which can be can be used as an optimization goal both in synchronous and island operation modes of microgrid. We decided to intensively test our approach on a sample rural LV microgrid, which is typical in the countryside. The observed results of the tests have been presented and analyzed in detail. Generally, results achieved with the use of proposed distributed control are the same as with the use of centralized control. We think that the approach based on distributed control is promising for practical applications, because of its advantages.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 6.

Tytuł:: Pointwise observation of the state given by parabolic system with boundary condition involving multiple time delays
Autorzy:: Kowalewski, A.
Tematy:: distributed control
parabolic system
time delays
pointwise observation; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Powiązania:: https://bibliotekanauki.pl/articles/229185.pdf Link otwiera się w nowym oknie
Opis:: Various optimization problems for linear parabolic systems with multiple constant time delays are considered. In this paper, we consider an optimal distributed control problem for a linear parabolic system in which multiple constant time delays appear in the Neumann boundary condition. Sufficient conditions for the existence of a unique solution of the parabolic equation with the Neumann boundary condition involving multiple time delays are proved. The time horizon T is fixed. Making use of the Lions scheme [13], necessary and sufficient conditions of optimality for the Neumann problem with the quadratic cost function with pointwise observation of the state and constrained control are derived.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 7.

Tytuł:: Pointwise observation of the state given by complex time lag parabolic system
Autorzy:: Kowalewski, A.
Tematy:: distributed control
parabolic system
time lags
pointwise observation; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Powiązania:: https://bibliotekanauki.pl/articles/229580.pdf Link otwiera się w nowym oknie
Opis:: Various optimization problems for linear parabolic systems with multiple constant time lags are considered. In this paper, we consider an optimal distributed control problem for a linear complex parabolic system in which different multiple constant time lags appear both in the state equation and in the Neumann boundary condition. Sufficient conditions for the existence of a unique solution of the parabolic time lag equation with the Neumann boundary condition are proved. The time horizon T is fixed. Making use of the Lions scheme [13], necessary and sufficient conditions of optimality for the Neumann problem with the quadratic performance functional with pointwise observation of the state and constrained control are derived. The example of application is also provided
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 8.

Tytuł:: Implementation of building a thermal model to improve energy efficiency of the central heating system - a case study
Autorzy:: Grela, Jakub
Markiewicz, Michał
Skała, Aleksander
Latoń, Dominik
Ożadowicz, Andrzej
Bańczyk, Katarzyna
Opis:: This paper presents the concept of an innovative control of a central heating system in a multifamily building based on the original thermodynamic model, the resulting architecture of the control system, and the originally designed and manufactured wireless temperature sensors for thermal zones. The novelty of this solution is the developed layers of the control system: distributed measurement and correction analysis, which is based on the existing infrastructure and the local HVAC controller. This approach allows for the effective use of the measured temperature data from thermal zones and finally sending the value of the calculated correction of settings to the controller. Moreover, in the analytical layer, a model was also implemented that calculates the necessary amount of energy based on data from the subsystem of temperature sensors located in the thermal zones of the building. The use of the algorithmic strategy presented in this paper extends the functionality and significantly improves the energy efficiency of the existing, classic, reference heating control algorithm by implementing additional control loops. Additionally, it enables integration with demand-side response systems. The presented concept was successfully tested, achieving real energy savings for heating by 12%. These results are described in a case-study format. The authors believe that this concept can be used in other buildings and thus will have a positive impact on the energy savings used to maintain thermal comfort in buildings and significantly reduce CO2 emissions.
Dostawca treści:: Repozytorium Uniwersytetu Jagiellońskiego

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Skocz do pozycji: 9.

Tytuł:: Badanie procesu samokonfiguracji systemu sterowania wytwarzaniem
Examining the process of manufacturing control system self-configuration
Autorzy:: Zając, J.
Norys, K.
Tematy:: rozproszone sterowanie
systemy wieloagentowe
samokonfiguracja
distributed control
multiagent systems
self-configuration; Pokaż więcej
Wydawca:: Sieć Badawcza Łukasiewicz - Przemysłowy Instytut Automatyki i Pomiarów
Powiązania:: https://bibliotekanauki.pl/articles/276910.pdf Link otwiera się w nowym oknie
Opis:: W pracy omówiono trzyetapową procedurę modelowania dyskretnych systemów produkcyjnych. Na jej podstawie zaproponowano koncepcję samokonfiguracji systemów sterowania wytwarzaniem. Koncepcja ta umożliwi budowanie rozproszonych systemów sterowania wytwarzaniem działających zgodnie z zasadą włącz i produkuj. Wymaga to zastosowania jednolitych, konfigurowalnych, inteligentnych agentów. Do badania procesu samokonfiguracji użyto oprogramowania symulacyjnego Arena firmy Rockwell Automation.
The paper describes the modelling process of a discrete manufacturing system as a three-stage procedure. It also presents the self-configuration procedure for distributed manufacturing control system. It will allow for the construction of the plug and produce distributed manufacturing control system, which require the integration of unified, easy to reconfigure, intelligent and cooperative agents. Arena Simulation Environment (Rockwell Automation) is used for examining the procedure.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 10.

Tytuł:: Regularized penalty method for non-coercive parabolic optimal control problems
Autorzy:: Kaplan, A.
Tichatschke, R.
Tematy:: sterowanie optymalne
distributed control
ill-posed parabolic control problems
penalty methods
proximal point methods; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Instytut Badań Systemowych PAN
Powiązania:: https://bibliotekanauki.pl/articles/205538.pdf Link otwiera się w nowym oknie
Opis:: The application of a proximal point approach to illposed convex control problems governed by linear parabolic equations is studied. A stable penalty method is constructed by means of multi-step proximal regularization (only w.r.t. the control functions) in the penalized problems. For distributed control problems with state constraints convergence of the approximately determined solutions of the regularized problems to an optimal process is proved.
Dostawca treści:: Biblioteka Nauki

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