Autor: Kwaśny, Łukasz - Katalog OPAC zbiorów

Skocz do pozycji: 1.

Tytuł:: Improving the dynamics of an inverter-based PV generator during load dumps
Poprawa dynamiki przekształtnikowego generatora pv podczas zrzutu mocy
Autorzy:: Kwaśny, Łukasz
Powiązania:: https://bibliotekanauki.pl/articles/408627.pdf
Data publikacji:: 2019
Wydawca:: Politechnika Lubelska. Wydawnictwo Politechniki Lubelskiej
Tematy:: load dump
dynamic states
anti-windup regulator
conditional integrator
zrzut mocy
stan nieustalony
regulator anti-windup
całkowanie warunkowe
Opis:: In distribution power grids supplied by dispersed power sources, for example RES (Renewable Energy Sources), in the event of a load dump, unexpected transient states may appear. These states involve a dangerous increase in voltage or current. This situation may lead to the disconnection of these sources. To prevent this phenomenon, a non-linear anti-windup regulator with a conditional integrator has been proposed. This solution allows a significant improvement of the generator’s dynamic properties both at load dump and on return to full load.
W sieciach dystrybucyjnych o rozproszonym charakterze zasilania, np. OZE (Odnawialne Źródła Energii), w przypadku wystąpienia zrzutów mocy mogą pojawić się nieoczekiwane stany nieustalone. Polegają one na niebezpiecznym wzroście napięcia lub prądu. Taka sytuacja może doprowadzić do wyłączenia tych źródeł energii. Aby temu zapobiec, zaproponowano nieliniowy regulator anti-windup z warunkowym integratorem. Rozwiązanie to pozwoliło zdecydowanie poprawić własności dynamiczne zarówno przy zrzucie mocy jak i powrocie do pełnego obciążenia.
Źródło:: Informatyka, Automatyka, Pomiary w Gospodarce i Ochronie Środowiska; 2019, 9, 4; 83-86
2083-0157
2391-6761
Pojawia się w:: Informatyka, Automatyka, Pomiary w Gospodarce i Ochronie Środowiska
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: Control of a Four-wire Hybrid Prosumer Converter for Balancing Utility Grids
Autorzy:: Kwaśny, Łukasz
Zieliński, Dariusz
Powiązania:: https://bibliotekanauki.pl/articles/1955973.pdf
Data publikacji:: 2021
Wydawca:: Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:: control of 4-wire converter
utility grid balancing
prosumer generation
hybrid PV converter
energy storage
Opis:: The paper presents the project of the power electronic AC/DC converter operating under a multiresonant control algorithm for prosumer applications. This design allows independent control of active and reactive power for any or each phase. Both the converter and its algorithm are based on a three-phase converter of four-wire topology (AC/DC 3p-4w) with a DC bus, which couple the converter to a renewable energy source and energy storage. Further, model and simulation tests were carried out in the Matlab-SIMULINK programming environment. The results obtained indicate that operation with deep unbalances and powers of opposite signs in individual phases results in current variations (oscillations) in the DC line, which is a significant limitation, and it can be concluded that the level of asymmetry should be limited to the level acceptable to the energy storage device.
Źródło:: Power Electronics and Drives; 2021, 6, 41; 1-11
2451-0262
2543-4292
Pojawia się w:: Power Electronics and Drives
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 3.

Tytuł:: Comparative study of DC/DC electric vehicle charging system with conventional transformer and planar transformer
Autorzy:: Rudawski, Maciej
Fatyga, Karol
Kwaśny, Łukasz
Powiązania:: https://bibliotekanauki.pl/articles/24202738.pdf
Data publikacji:: 2023
Wydawca:: Polska Akademia Nauk. Czasopisma i Monografie PAN
Tematy:: conventional transformer
dual active bridge
electric vehicle charging station
planar transformer
Opis:: This paper presents an analysis of electric vehicle charging station operation based on a dual active bridge topology. Two cases are considered: one with the use of a medium frequency planar transformer, the other with a conventional Litz winding transformer. An analysiswas performed using both solutions in order to compare the performance characteristics of the system for both cases and to present the differences between each transformer solution. The analysis was based on tests carried out on the full-scale model of an electric vehicle charging station, which is the result of the project "Electric vehicle charging system integrated with lighting infrastructure" realized by the Department of Drives and Electrical Machines, Lublin University of Technology. The results presented in the paper show that the conventional transformer used in the research achieved better results than the planar transformer. Based on the results obtained, the validity of using both solutions in electric vehicle charging stations was considered.
Źródło:: Archives of Electrical Engineering; 2023, 72, 2; 339--355
1427-4221
2300-2506
Pojawia się w:: Archives of Electrical Engineering
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 4.

Tytuł:: Impacts of forest spatial structure on variation of the multipath phenomenon of navigation satellite signals
Autorzy:: Brach, Michał
Stereńczak, Krzysztof
Bolibok, Leszek
Kwaśny, Łukasz
Krok, Grzegorz
Laszkowski, Michał
Powiązania:: https://bibliotekanauki.pl/articles/2044153.pdf
Data publikacji:: 2019
Wydawca:: Instytut Badawczy Leśnictwa
Tematy:: GNSS
multipath
random forest
Borut
forest structure
LiDAR
Opis:: The GNSS (Global Navigation Satellite System) receivers are commonly used in forest management in order to determine objects coordinates, area or length assessment and many other tasks which need accurate positioning. Unfortunately, the forest structure strongly limits access to satellite signals, which makes the positioning accuracy much weak comparing to the open areas. The main reason for this issue is the multipath phenomenon of satellite signal. It causes radio waves reflections from surrounding obstacles so the signal do not reach directly to the GNSS receiver’s antenna. Around 50% of error in GNSS positioning in the forest is because of multipath effect. In this research study, an attempt was made to quantify the forest stand features that may influence the multipath variability. The ground truth data was collected in six Forest Districts located in different part of Poland. The total amount of data was processed for over 2,700 study inventory plots with performed GNSS measurements. On every plot over 25 forest metrics were calculated and over 25 minutes of raw GNSS observations (1500 epochs) were captured. The main goal of this study was to find the way of multipath quantification and search the relationship between multipath variability and forest structure. It was reported that forest stand merchantable volume is the most important factor which influence the multipath phenomenon. Even though the similar geodetic class GNSS receivers were used it was observed significant difference of multipath values in similar conditions.
Źródło:: Folia Forestalia Polonica. Series A . Forestry; 2019, 61, 1; 3-21
0071-6677
Pojawia się w:: Folia Forestalia Polonica. Series A . Forestry
Dostawca treści:: Biblioteka Nauki

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