Wyniki wyszukiwania - BazTech

1

Analysis of the required energy storage capacity for balancing the load schedule and managing the electric energy demand of an apartment building

Mazur Magdalena, Fedorchuk Stanislav, Kulapin Olexandr, Ivakhnov Andrii, Danylchenko Dmytro, Miroshnyk Oleksandr, Shchur Taras, Halko Serhii, Idzikowski Adam

System Safety : Human - Technical Facility - Environment

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2023

|

Vol. 5, iss. 1

342--349

EN

The rapid and voluminous development of renewable generation, and its stochastic nature, creates problems in terms of maintaining frequency and balance in the power system. In this work, demand response management and the use of the concept of demand response are discussed in detail. The potential of using prosumers to maintain the power balance in the power system is considered. The analysis of prosumers was carried out on the basis of a study of load schedules of typical consumers with software that forms schedules taking into account socio-demographic characteristics.

2

Power system small signal stability enhancement using fuzzy based STATCOM

Kassahun Habitamu Endalamaew, Salau Ayodeji Olalekan, Osaloni Oluwafunso Oluwole, Olaluyi Olawale Joshua

Przegląd Elektrotechniczny

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2023

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R. 99, nr 8

27--32

EN

This paper describes how fuzzy based STATCOM was used to improve the small signal stability of Tis Abay II electric power generation. Tis Abay II is a power generation facility in Ethiopia, located in the Bahir Dar Amhara region, with a nominal apparent power generating capacity of 40MVA. The oscillating nature of a rotating machine, the imbalance of load and generation, the presence of exciter and compensator, and the occurrence of faults all contribute to the disruption on an interconnected power network. The frequency oscillation of the existing plant was evaluated in the absence of a power system stabilizer (PSS) and an adaptive fuzzy logic controller (AFLC). The proposed system network configuration was used to fine-tune the mathematical analysis of synchronous machine data and model. The proposed model incorporates SMIB system modeling and an AFLC. MATLAB Simulink was used to simulate the effect of the PSS and AFLC on rotor speed, angle, and electrical torque. The proposed system's power system dynamic stability was improved using a PSS and a fuzzy logic-based STATCOM. According to the simulation results, FLCbased STATCOM is best suited for improving the dynamic stability of Tis Abay II power generation.

PL

W tym artykule opisano, w jaki sposób STATCOM oparty na rozmyciu został wykorzystany do poprawy stabilności małych sygnałów w wytwarzaniu energii elektrycznej Tis Abay II. Tis Abay II to zakład energetyczny w Etiopii, położony w regionie Bahir Dar Amhara, o nominalnej mocy pozornej wytwarzania 40MVA. Oscylacyjny charakter maszyny wirującej, niezrównoważenie obciążenia i generacji, obecność wzbudnicy i kompensatora oraz występowanie usterek przyczyniają się do zakłóceń w połączonej sieci energetycznej. Oscylacje częstotliwości istniejącej elektrowni zostały ocenione przy braku stabilizatora systemu elektroenergetycznego (PSS) i adaptacyjnego sterownika logiki rozmytej (AFLC). Zaproponowana konfiguracja sieci systemu została wykorzystana do dostrojenia analizy matematycznej danych i modelu maszyny synchronicznej. Proponowany model obejmuje modelowanie systemu SMIB i AFLC. MATLAB Simulink wykorzystano do symulacji wpływu PSS i AFLC na prędkość wirnika, kąt i moment elektryczny. Stabilność dynamiczna systemu elektroenergetycznego proponowanego systemu została poprawiona za pomocą PSS i STATCOM opartego na logice rozmytej. Zgodnie z wynikami symulacji, STATCOM oparty na FLC najlepiej nadaje się do poprawy dynamicznej stabilności generacji Tis Abay II.

3

Stabilizer design of PSS3B based on the KH algorithm and Q-Learning for damping of low frequency oscillations in a single-machine power system

Mohamadi Farshid, Sedaghati Alireza

Journal of Power Technologies

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2023

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Vol. 103, nr 4

230--242

EN

The aim of this study is to use the reinforcement learning method in order to generate a complementary signal for enhancing the performance of the system stabilizer. The reinforcement learning is one of the important branches of machine learning on the area of artificial intelligence and a general approach for solving the Marcov Decision Process (MDP) problems. In this paper, a reinforcement learning-based control method, named Q-learning, is presented and used to improve the performance of a 3-Band Power System Stabilizer (PSS3B) in a single-machine power system. For this end, we first set the parameters of the 3-band power system stabilizer by optimizing the eigenvalue-based objective function using the new optimization KH algorithm, and then its efficiency is improved using the proposed reinforcement learning algorithm based on the Q-learning method in real time. One of the fundamental features of the proposed reinforcement learning-based stabilizer is its simplicity and independence on the system model and changes in the working points of operation. To evaluate the efficiency of the proposed reinforcement learning-based 3-band power system stabilizer, its results are compared with the conventional power system stabilizer and the 3-band power system stabilizer designed by the use of the KH algorithm under different working points. The simulation results based on the performance indicators show that the power system stabilizer proposed in this study underperform the two other methods in terms of decrease in settling time and damping of low frequency oscillations.

4

Macromodeling of local power supply system balance forecasting using fractal properties of load and generation schedules

Jarykbassov Daniyar, Lezhniuk Petr, Hunko Iryna, Lysyi Vladyslav, Dobrovolska Lyubov

Informatyka, Automatyka, Pomiary w Gospodarce i Ochronie Środowiska

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2023

|

T. 13, nr 3

79--82

EN

A method of forecasting the balance of electricity consumption of urban development objects, civil purposes using discrete macromodels is proposed. We consider the power supply system (PSS) of the district, which is characterised by power supply from general-purpose power grids, as well as having its own generation of electricity from renewable energy sources (RES). Such a local electric power system (LES) under certain conditions can be operated as an independent balanced electrical facility. For optimal operation of the LES under these conditions, it is necessary to predict its power consumption schedules. The proposed macromodelling method allows to develop deterministic models of power consumption with the required accuracy on the basis of retrospective information without the use of data preprocessing procedures. The solution to the problem of forecasting electricity consumption schedules is simplified by using only basic or deterministic characteristics in the construction of the model. These include fractal properties of PSS load schedules.

PL

Zaproponowano metodę prognozowania bilansu zużycia energii elektrycznej przez obiekty miejskie o przeznaczeniu cywilnym z wykorzystaniem makromodeli dyskretnych. Rozważany jest system zasilania (SZ) dzielnicy, który charakteryzuje się zasilaniem z sieci ogólnego przeznaczenia, a także posiada własną produkcję energii elektrycznej z odnawialnych źródeł energii (OZE). Taki lokalny system elektroenergetyczny (LES) w pewnych warunkach może być eksploatowany jako niezależny, zrównoważony obiekt elektryczny. Aby zapewnić optymalne działanie LES w takich warunkach, konieczne jest przewidywanie jego harmonogramów poboru mocy. Proponowana metoda makromodelowania pozwala na opracowanie deterministycznych modeli poboru mocy z wymaganą dokładnością na podstawie informacji retrospektywnych bez stosowania procedur wstępnego przetwarzania danych. Rozwiązanie problemu prognozowania planów zużycia energii elektrycznej jest uproszczone poprzez wykorzystanie w konstrukcji modelu jedynie podstawowych lub deterministycznych charakterystyk. Obejmują one fraktalne właściwości harmonogramów obciążenia SZ.

5

Systemy zasilania pomieszczeń medycznych grupy 2. Wybrane zagadnienia

Makarewicz Robert

Elektro Info

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2021

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nr 5

88--90

PL

Pomieszczenia, w których dokonywane są czynności medyczne z użyciem elektronarzędzi medycznych, muszą być zabezpieczone dodatkowo przed porażeniem, prądem upływu oraz przed przedwczesnym zadziałaniem zabezpieczeń. Do tego celu służą zestawy rozdzielcze w układzie zasilania IT, przeznaczone do pomieszczeń medycznych.

6

IEC 61850 interface for real time power system simulation

Kurek Karol, Nogal Łukasz, Kowalik Ryszard, Januszewski Marcin

Bulletin of the Polish Academy of Sciences. Technical Sciences

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2021

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Vol. 69, nr 3

art. no. e137057

EN

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.

7

Computation method for analysis of sliding faults in power systems

Machowski Jan, Robak Sylwester

Bulletin of the Polish Academy of Sciences. Technical Sciences

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2021

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Vol. 69, nr 1

art. no. e135841

EN

Short-circuit analysis is conducted based on the nodal impedance matrix, which is the inversion of the nodal admittance matrix. If analysis is conducted for sliding faults, then for each fault location four elements of the nodal admittance matrix are subject to changes and the calculation of the admittance matrix inversion needs to be repeated many times. For large-scale networks such an approach is time consuming and unsatisfactory. This paper proves that for each new fault location a new impedance matrix can be found without recalculation of the matrix inversion. It can be found by a simple extension of the initial nodal impedance matrix calculated once for the input model of the network. This paper derives formulas suitable for such an extension and presents a flowchart of the computational method. Numerical tests performed for a test power system confirm the validity and usefulness of the proposed method.

8

Dynamic Communication Topologies for Distributed Heuristics in Energy System Optimization Algorithms

Holly Stefanie, Nieße Astrid

Annals of Computer Science and Information Systems

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2021

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Vol. 25

191--200

EN

The communication topology is an essential aspect in designing distributed optimization heuristics. It can influence the exploration and exploitation of the search space and thus the optimization performance in terms of solution quality, convergence speed and collaboration costs - relevant aspects for applications operating critical infrastructure in energy systems. In this work, we present an approach for adapting the communication topology during runtime, based on the principles of simulated annealing. We compare the approach to common static topologies regarding the performance of an exemplary distributed optimization heuristic. Finally, we investigate the correlations between fitness landscape properties and defined performance metrics.

9

Design of multifunction simulator for engine room personnel training

Ivanov Artem, Kolosov Igor, Danyk Vadim, Voronenko Sergey, Lebedenko Yurii, Rudakova Hanna

Informatyka, Automatyka, Pomiary w Gospodarce i Ochronie Środowiska

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2020

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T. 10, nr 2

62--69

EN

International requirements for improving energy efficiency and environmental protection and the necessary goals for their implementation in the marine industry are an actual problem. To integrate state-of-the-industry technologies and marine specialists education, the training complex is proposed. It is based on the platform of a hardware-software complex with the ability to integrate training equipment, simulators and software. That makes such a training complex multitask, universal, and flexible in achieving a variety of tasks and goals. The complex also implements high-quality education and training of marine specialists, conducting research after processing working out the results of engineering modelling of structural, thermal power, hydraulic, electrical, electronic, multi-physical and other solutions. The need to use the training complex allows us to form the necessary competence of the engine team personnel, develop methods and criteria for assessing competence, evaluate and demonstrate practical skills.

PL

Międzynarodowe wymogi dotyczące poprawy efektywności energetycznej i ochrony środowiska oraz cele niezbędne do ich wdrożenia w przemyśle morskim stanowią aktualny problem. W celu zintegrowania najnowocześniejszych technologii i kształcenia specjalistów z branży morskiej proponuje się utworzenie kompleksu szkoleniowego. Jest on oparty na platformie kompleksu sprzętowo-programowego z możliwością integracji sprzętu szkoleniowego, symulatorów i oprogramowania. To sprawia, że taki kompleks jest wielozadaniowy, uniwersalny i elastyczny w realizacji różnorodnych zadań i celów. Ponadto kompleks realizuje wysokiej jakości kształcenie i szkolenie specjalistów morskich, prowadząc badania po opracowaniu wyników modelowania inżynierskiego rozwiązań konstrukcyjnych, cieplnych, hydraulicznych, elektrycznych, elektronicznych, i innych. Wykorzystanie kompleksu szkoleniowego pozwala na kształtowanie niezbędnych kompetencji personelu zespołu inżynierskiego, opracowanie metod i kryteriów oceny kompetencji, ocenę i wykazanie umiejętności praktycznych.

10

System Akwizycji Danych Samowystarczalny Energetycznie

Słota Marcin

Elektroinstalator

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2020

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nr 1

40--41

PL

Wszystkie układy pomiarowe, czy to banalnie proste, czy też bardzo skomplikowane mają jedną wspólną cechę: wymagają stabilnego zasilania. Układy zasilające systemy pomiarowe mają się charakteryzować nieprzerwaną pracą i stałością parametrów. W artykule opisano budowę prototypu Systemu Akwizycji Danych, który z założenia ma być niezależny od tradycyjnych źródeł zasilania. Zostanie przedstawiona koncepcja, jak również budowa poszczególnych modułów systemu. Prototyp systemu został zbudowany i uruchomiony. Posłuży on do stworzenia produktu zoptymalizowanego pod względem energooszczędności, jak również zminimalizowania gabarytów. Artykuł i urządzenie zostały przygotowane w ramach pracy statutowej pt. „System Akwizycji Danych Samowystarczalny Energetycznie”.

11

Study on application of Fisher information for power system fault detection

Cai S., Liu G.

Journal of Power Technologies

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2018

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Vol. 98, nr 3

274--280

EN

The ability to accurately detect power system faults is of vital importance for the purpose of isolating malfunctioning equipment and resuming normal operation as soon as possible after a fault occurs. People have used a variety of electric parameters as metrics to identify faults for a long time. The method proposed by this paper departs from the traditional approach by introducing Fisher information (FI) as a measure of the stability of electric signals and as a criterion for making fault decisions. In this way, a non-dimensional positive parameter is used as a single criterion to deliver fault detection for power distribution networks. Firstly, we simplified the formula of FI and then adopted a practical method for calculating values of FI. We demonstrated the application of FI to measure the stability of electric signals. Finally, we combined FI with wavelet analysis to propose a novel technique for phase selection of a power distribution network with a grounding short-circuit fault, namely the wavelet-based Fisher information (WFI). Simulation studies were then carried out to show the feasibility of the proposed method.

12

Biodiversity and antibiotic resistance of bacteria isolated from tap water in Wrocław, Poland

Leginowicz M., Siedlecka A., Piekarska K.

Environment Protection Engineering

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2018

|

Vol. 44, nr 4

85--98

EN

Microbial contamination and biodiversity were determined for the drinking water samples collected from selected points of the water supply system in Wroclaw, Poland. All tested samples met the requirements of Polish law, i.e., the Regulation of the Minister of Health. However, the antibiotic resistant bacteria were found. The correlation between the distance of sampling points from water treatment plants and their microbial contamination was not established. Nevertheless, the Na Grobli treatment plant seemed to produce water of higher microbial quality than the Mokry Dwor treatment plant at the moment of sampling. The identification of representative isolates was performed with 16S rRNA gene sequencing and MALDI-TOF mass spectrometry and the results of these two methods were compared, indicating some discrepancies. Nevertheless, bacteria dwelling in drinking water in Wroclaw belonged to the phyla Actinobacteria, Proteobacteria (alpha-, beta-, gamma-Proteobacteria) and Firmicutes . The determination of antibiotic resistance profiles showed that 12 from 17 tested isolates revealed resistance to at least one antibiotic and two strains were multi-drug-resistant.

13

The method for increasing the efficiency of equipment’s maintenance in railway traction power supply systems

Matusevych O., Kuznetsov V., Sychenko V.

Archives of Transport

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2018

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Vol. 47, iss. 3

39--47

EN

Purpose. To develop the method for increasing the efficiency of the equipment’s maintenance and repair system, ensuring necessary level of operational reliability of the equipment, safety and reliability of the electric equipment with minimal expenses on operation. Relevance. Aging of the power equipment in railway power supply systems sharply raised a need for assessment of its states and degree of risk for operation outside rated service life. In critical conditions of technological processes and operational modes of the railways it is necessary to increase the equipment’s operational reliability. The scheduled maintenance and repair system whose main technical and economic criterion is the minimum of equipment’s downtimes on the basis of a rigid regulation of repair cycles, in the conditions of market regulations in the field of repair in many cases does not provide the optimal decisions due to insufficient financing. The solution of this problem is possible by improvement of the maintenance and repair system. Under these conditions the main direction for supporting the operational reliability of power electric equipment on TS is a development of the modern methods based on individual supervision over real changes of technical condition of power equipment. Scientific novelty. In this article the authors proposed an integrated approach, on the basis of which can be developed the effective maintenance and repair system for traction power supply systems. Proposed approach allowed to react quickly to changes of service conditions on traction substations, to control the technical condition of power electric equipment under the conditions of uncertainty, to establish interrelation between quality of service and operational reliability of the equipment, to choose a service strategy on traction substations. Practical importance. The validity of the developed method was confirmed by the results of calculations and practically by choosing the optimal maintenance's option for transformer TDTN-25000/150-70 U1 (ТДТН-25000/150-70 У1) on traction power supply substation.

14

Wind turbine blade anti-icing and deicing system. Summary of DeICE-UT project - 7th EU Framework Programme

Jaroszewski K., Bonisławski M., Hołub M.

Pomiary Automatyka Robotyka

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2017

|

R. 21, nr 1

71--80

EN

A concept of the anti/deicing system is presented. The main system components: actuators, supply system as well as HMI are briefly described. Results of the verification of the system in a climatic chamber are presented. Concluding remarks about system’s efficiency are provided.

PL

W artykule prezentowana jest koncepcja systemu odmrażania i przeciwdziałania obladzaniu się łopat turbin wiatrowych. Opisano główne komponenty systemu, m.in.: układy wykonawcze, system zasilania oraz komputerowy system sterowania. Zaprezentowano także wyniki, przeprowadzonej w komorze klimatycznej, walidacji systemu. W ostatniej części zebrano spostrzeżenia dotyczące efektywności działania systemu.

15

Zasilanie stacyjnych systemów sterowania ruchem kolejowym

Kornaszewski M.

Autobusy : technika, eksploatacja, systemy transportowe

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2017

|

R. 18, nr 6

806--809, CD

PL

Urządzenia stacyjne sterowania ruchem kolejowym ze względu na przeznaczenie muszą mieć zapewnione bezprzerwowe zasilanie. Nawet chwilowy brak napięcia zasilającego może spowodować nieodwracalne skutki związane z zaistnieniem niepożądanych zdarzeń z udziałem pociągów, czy ofiarami w ludziach. Dlatego urządzeniom sterowania ruchem kolejowym zapewnia się trzy niezależne źródła zasilania, w tym jedno zasadnicze i dwa rezerwowe. Szczegółowe wymagania dotyczące zasilania tych urządzeń zostały przedstawione w wytycznych technicznych budowy urządzeń srk Ie-4 (WTB-E10).

EN

The station railway traffic control devices must be provided with the uninterruptible power supply for the intended use. Even a temporary lack of the power supply can cause irreversible consequences. Their effects can be associated with the occurrence of adverse events involving trains or casualties in people. Therefore, there are three independent power sources intended for the railway traffic control devices including one basic and two reserve sources. The specific requirements for the power supply of these devices are presented in the technical guidelines for the railway traffic control devices construction Ie-4 (WTB-E10).

16

Electrical Power Infrastructure for Modern Rolling Stock with Regard to the Railway in Poland

Szeląg A.

Archives of Transport

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2017

|

Vol. 42, iss. 2

75--83

EN

Implementing high-speed trains on Polish railway lines requires a new approach to the issue of power and energy supply via a 3 kV DC power system. Due to the control systems used, modern rolling stock equipped with asynchronous drive allows maintaining a set speed, as far as a locomotive’s power and voltage in a catenary allow it. Characteristics of traction vehicles with asynchronous drives enables run at voltage lower than the rated voltage, however, it entails decrease of consumed power (required for locomotives with power above 2 MW) and loss of motion dynamics. Modernisation of a railway power supply system conducted in Poland since the mid-1990s of the 20th century has intensified in the past couple of years (so-called MUZ-I program) due to the purchase of Pendolino trains, and it primarily include the main lines. A number of modernisation investments (lines E65, E20, E30) are implemented with co-financing from the EU funds. Due to the predicted trains’ speed (200 km/h and above), in order to fulfill the requirements specified in TSI, a power supply system on these lines should ensure achieving high parameters, that is supply of trains with current up to 3.2 kA, while the so-called mean useful voltage should not be lower than 2.8 kV. The article presents solutions introduced on Polish railway and aiming at adjusting the power supply used to the TSI requirements. The range of conducted modernisation works allows for conclusion that the process is in fact a re-electrification of railway power supply systems.

17

Multi-machine power system fuzzy stabilizer design using Cuckoo search algorithm

Koochaki A., Skandarnezhad A., Mohammadmoradi Y., Salimi S.

Przegląd Elektrotechniczny

|

2016

|

R. 92, nr 3

1--5

EN

Nowadays, fuzzy controllers have achieved an important role in different systems and their superiority over the classical control methods has been proved. In this study, the power system stabilizer is used to damp the power system oscillations based on the fuzzy logic controller. A three-phase to ground-fault test is done during a period of 10 ms to evaluate power system behaviour between the area of two distinct points. Simulation results show that the system is unstable without a stabilizer. It has also been determined that the fuzzy stabilizers have high ability to damp the system oscillations in comparison with classical stabilizers so that system oscillations are damped with higher speed and lower amplitude. Also in this study, the Cuckoo search algorithm is used to optimize the fuzzy stabilizer inputs and improve its performance. The results show that the optimizations of stabilizer parameters improve their damping performance.

PL

W artykule opisano algorytm typu Fuzzy logic wykorzystany do tłłumirnia oscylacji w systemie zasilania.Wykoyowany jest test systemu między dwoma odległymi punktami. W porównaniu z klasycznymi sterownikami zaproponowany sterownik oscylacje tłumione sa szybciej i skuteczniej.

18

Applications of wavelet transform for analysis of electrical transients in power systems: the review

Osipov D. S., Lyutarevich A. G., Gapirov R. A., Gorunov V. N., Bubenchikov A. A.

Przegląd Elektrotechniczny

|

2016

|

R. 92, nr 4

162--165

EN

This paper presents a review of application of discrete wavelet transform in power system transient analyses. Based on the discrete time domain approximation, the system components such as resistor and inductor are modeled respectively in discrete wavelet domain for the purpose of transient and steady state analyses. Numerical results for transient inductor model can be implemented by any kind of power system including normal and emergency operating modes.

PL

W artykule przedstawiono przegląd stosowania dyskretnej transformaty falkowej do analizy stanów nieustalonych systemu elektroenergetycznego. W oparciu o dyskretne zbliżenia w dziedzinie czasu, elementy systemu, takie jak rezystor i cewki indukcyjnej są modelowane jako odpowiednie dyskretne domeny falkowe.

19

Zastosowania zasobników energii w systemach zasilania. Cz. 2

Piotrowski P., Grzyb A.

Elektro Info

|

2016

|

nr 11

50--53

PL

W dwuczęściowym artykule przedstawiono wybrane zagadnienia dotyczące wykorzystania zasobników energii w różnych systemach zasilania. Omówiono perspektywy rozwoju zasobników energii. Sformułowano wnioski końcowe.

EN

In two part article applications of energy storages in the various power systems were presented. Prospects for the development of energy storage were described. The final conclusions have been presented.

20

Zastosowania zasobników energii w systemach zasilania. Cz. 1

Piotrowski P.

Elektro Info

|

2016

|

nr 10

46--50

PL

W dwuczęściowym artykule przedstawiono wybrane zagadnienia dotyczące wykorzystania zasobników energii w różnych systemach zasilania. Omówiono perspektywy rozwoju zasobników energii. Sformułowano wnioski końcowe.

EN

In two part article applications of energy storages in the various power systems were presented. Prospects for the development of energy storage were described. The final conclusions have been presented.