Informacja

Drogi użytkowniku, aplikacja do prawidłowego działania wymaga obsługi JavaScript. Proszę włącz obsługę JavaScript w Twojej przeglądarce.

English (EN)·Polski (PL)·Yкраїнський (UK)
Przejdź do strony domowej biblioteki Centralna Biblioteka Wojskowa Link otwiera się w nowym oknie Logo biblioteki Prolib Integro - strona głównaCentralna Biblioteka Wojskowa

Wyszukujesz frazę "converter system" wg kryterium: Temat

  Lista filtrów
Wyrównaj
Wyświetlanie 1-15 z 51
Tytuł:
Computationally efficient method of simulation of an electric drive impact on the power grid
Autorzy:
Beniak, R.
Gardecki, A.
Powiązania:
https://bibliotekanauki.pl/articles/141226.pdf
Data publikacji:
2013
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
electric drive
converter system model
power grid
Opis:
This paper presents a computationally efficient method for modelling an impact of the converter drive on the power grid. The formalized variable structure method (FVSM) allows for comprehensive studies of the effect on the power grid and examining the relation between this effect and the number of drive and feeding line parameters. In order to obtain a comprehensive model along with the model of the power grid, the parameters that are applied originate from a drive of a coal-fired power station. These parameters have been determined based on assessment and estimation. The estimation process was conducted with the aid of a model that allows for the commutation of power electronic elements. The authors confirmed that the model was correct by comparing empirical and theoretical voltage and current waveforms. Harmonic content of the voltage and current in the power grid which feeds the drive are considered to be the measure of the converter drive impact on the power grid. The standard method for the reduction of a harmonic content in the voltage and current involves the application of line reactors and distribution or converter transformers. As an example, the authors determine the impact of the drive on the power grid with respect to the adopted parameters of the line reactor. This example presents FVSM abilities with regard to simulation of complex systems that contain power grid components and converter drives.
Źródło:
Archives of Electrical Engineering; 2013, 62, 1; 77-90
1427-4221
2300-2506
Pojawia się w:
Archives of Electrical Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Industrial implementations of control algorithms for voltage inverters supplying induction motors
Autorzy:
Jabłoński, Mariusz
Borkowski, Piotr
Powiązania:
https://bibliotekanauki.pl/articles/1841309.pdf
Data publikacji:
2021
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
open mining
sensorless control
vector-controlled
adjustable speed drive
converter system
voltage-feed induction motors
Opis:
This article discusses the most important issues regarding the implementation of digital algorithms for control and drive technology in industrial machines, especially in open mining machines. The article presents the results of tests in which the algorithm and drive control parameter settings were not selected appropriately for voltage-fed induction motors, and where the control speed was not verified by any of the available motoring or simulation methods. We then show how the results can be improved using field-oriented control algorithms and deep parameters analysis for sensorless field-oriented performance.
Źródło:
Archives of Electrical Engineering; 2021, 70, 2; 475-491
1427-4221
2300-2506
Pojawia się w:
Archives of Electrical Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Experimental study on fault ride-through capability of VSC-based HVDC transmission system
Autorzy:
Khoa, Ngo Minh
Toan, Nguyen An
Tung, Doan Duc
Powiązania:
https://bibliotekanauki.pl/articles/1841366.pdf
Data publikacji:
2021
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
converter system
experimental waveform
fault ride through
High Voltage Direct Current
voltage sag
system konwertera
eksperymentalny przebieg
prąd stały wysokiego napięcia
spadek napięcia
Opis:
For voltage-source-converter based high-voltage-direct-current (VSC-HVDC)transmission systems, fault ride-through (FRT) capability is a very important grid requirement in order to enhance its operational availability under an alternating current (AC) gridfault condition. Voltage sags during a short-circuit fault in power transmission lines can leadto fluctuations in the direct current (DC) link voltage of converter systems, and may inducereversed power flow and even trip a VSC-HVDC transmission system. A practical methodis developed in this paper for investigating FRT capability of VSC-HVDC transmissionsystem characteristics during a voltage sag event using experimental results from Smart Grid Laboratory. Symmetrical and asymmetrical voltage sag events with different remaining voltages are applied to an AC grid that lasts with a variable duration. The experimental waveforms of the two converter systems are recorded and analyzed in order to evaluate theFRT capability of VSC-HVDC transmission systems.
Źródło:
Archives of Electrical Engineering; 2021, 70, 1; 37-51
1427-4221
2300-2506
Pojawia się w:
Archives of Electrical Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Photovoltaic DC-DC converter test system
Autorzy:
Tomaszuk, A.
Powiązania:
https://bibliotekanauki.pl/articles/377931.pdf
Data publikacji:
2013
Wydawca:
Politechnika Poznańska. Wydawnictwo Politechniki Poznańskiej
Tematy:
DC-DC converter
photovoltaic system
PV
PV converter
Opis:
This paper describes LabVIEW based integrated measurement system to determine key parameters of DC-DC converters working in low-voltage photovoltaic (PV) systems. DC-DC converter should demonstrate high efficiency of energy conversion as well as sufficient voltage gain to yield as much energy from PV panel as it is possible. Efficiency and voltage gain can be measured across the number of parameters such as input voltage, output load, frequency and duty cycle of converter driving signals. The LabVIEW application works with both Hioki 8855 data recorder which carries out power measurements and a microcontroller Digital Driver who drives a converter tested. Measurement system allows to automate time consuming measurements as well as experimentally verify DC-DC converter design assumptions. The laboratory test results of selected DC-DC converter prototype as well as sources of error has been discussed in this paper.
Źródło:
Poznan University of Technology Academic Journals. Electrical Engineering; 2013, 74; 283-288
1897-0737
Pojawia się w:
Poznan University of Technology Academic Journals. Electrical Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Multifunctional unit for reverse conversion and sign detection based on five-moduli set { 2 2n , 2 n + 1, 2 n − 1, 2 n + 3, 2 n − 3 }
Autorzy:
Mojahed, Mohsen
Molahosseini, Amir Sabbagh
Zarandi, Azadeh Alsadat Emrani
Powiązania:
https://bibliotekanauki.pl/articles/2097893.pdf
Data publikacji:
2021
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
Tematy:
computer arithmetic
residue number system
reverse converter
Opis:
A high dynamic range moduli set { 2 2n , 2 n + 1, 2 n − 1, 2 n + 3, 2 n − 3} has recently been introduced as an arithmetically balanced five-modull set for the residue number system (RNS). In order to utilize this moduli set in applications handling signed numbers, two important components are needed: a sign detector, and a signed reverse converter. However, having both of these components results in high-hardware requirements, which makes RNS impractical. This paper overcomes this problem by designing a unified unit that can perform both signed reverse conversion as well as sign detection through the reuse of hardware. To the authors’ knowledge, this is the first attempt to design a sign detector for a moduli set that includes a {2 n 3} moduli. In order to achieve a hardwareamenable design, we first improved the performance of the previous unsigned reverse converter for this moduli set. Then, we extracted a sign-detection method from the structure of the reverse converter. Finally, we made an unsigned reverse converter-to-sign converter through the use of the extracted sign signal from the reverse converter. The experimental results show that the proposed reverse convertor and sign detector result in improvements of 31% and 28% in area and delay, respectively, as compared to the previous unsigned reverse convertor with sign output using a comparator.
Źródło:
Computer Science; 2021, 22 (1); 101-121
1508-2806
2300-7036
Pojawia się w:
Computer Science
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Robust microgrids for distribution systems with high solar photovoltaic penetration
Autorzy:
Sampath, Ediriweera W.E.P.
Lidula, N.W.A.
Herath, H. Dayan B.P.
Powiązania:
https://bibliotekanauki.pl/articles/27309941.pdf
Data publikacji:
2023
Wydawca:
Polska Akademia Nauk. Czasopisma i Monografie PAN
Tematy:
converter
dynamic system
robustness
stability
synchronous generators
Opis:
A microgrid is an appropriate concept for urban areas with high penetration of renewable power generation, which improves the reliability and efficiency of the distribution network at the consumer premises to meet various loads such as domestic, industrial, and agricultural types. Microgrids comprising inverter-based and synchronous generator-based distribution generators can lead to the instability of the system during the islanded mode of operation. This paper presents a study on designing stable microgrids to facilitate higher penetration of solar power generation into a distribution network. A generalized small signal model is derived for a microgrid with static loads, dynamic loads, energy storages, solar photovoltaic (PV) systems, and diesel generators, incorporating the features of dynamic systems. The model is validated by comparing the transient curves given by the model and a transient simulator subjected to step changes. The result shows that full dynamic models of complex systems of microgrids can be built accurately, and the proposed microgrid is stable for all the considered loading situations and solar PV penetration levels according to the small signal stability analysis.
Źródło:
Archives of Electrical Engineering; 2023, 72, 3; 785--809
1427-4221
2300-2506
Pojawia się w:
Archives of Electrical Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Simulation of high-efficiency interleaved step-up DC-DC converter with coupled inductors to use in renewable energy system
Autorzy:
Tomaszuk, A.
Powiązania:
https://bibliotekanauki.pl/articles/377590.pdf
Data publikacji:
2012
Wydawca:
Politechnika Poznańska. Wydawnictwo Politechniki Poznańskiej
Tematy:
DC-DC converter
inductor
renewable energy system
Opis:
The majority of renewable energy sources deliver relatively low output voltage. In renewable energy systems high-efficiency high voltage gain step-up DC-DC converters are required as the interface between low voltage sources and the load. Therefore overall performance of the renewable energy system is strongly affected by the efficiency of step-up DC-DC converter itself. This paper presents high-efficiency interleaved step-up DC-DC converter with coupled inductors. Interleaved approach minimizes the current stress of the switches as well as the a sizes of the inductors but also allows reducing input current ripples. The other advantage of interleaving structure is the flexibility of number of phases extension. The number of working phases can be determined depending on the power requirements of the load. High efficiency is achieved by recycling the energy from leakage inductance present in practical coupled inductors. In order to re-use leakage energy voltage clamp circuit is applied. It allows to minimize voltage stress across the switches further improving the efficiency of interleaved DC-DC converter. The simulation carried out will present parametric and performance characteristics of the converter. Most efficient configuration and the number of phases will be discussed in this paper.
Źródło:
Poznan University of Technology Academic Journals. Electrical Engineering; 2012, 70; 217-224
1897-0737
Pojawia się w:
Poznan University of Technology Academic Journals. Electrical Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Chaotic Processes In PWM Converter
Autorzy:
Zhuikov, V.
Matiiko, A.
Powiązania:
https://bibliotekanauki.pl/articles/410563.pdf
Data publikacji:
2016
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
bifurcation
feedback signal gain
precision system
converter
chaos
Opis:
The possibility of chaotic oscillations in them is determined. The structure of the chaotic oscillations in the DC converter is considered. The system stability at various gain values of the feedback signal is investigated. The task is building a precision DC buck converter. The goal is achieved by means of providing high feedback signal gain converter operation mode. The work of the converter is commended in a case of: a) changing the input voltage; b) changing the value of the load resistance. It is shown that while ensuring the appropriate converter operation mode it is possible to improve stabilising properties and reduce the system operation frequency.
Źródło:
Present Problems of Power System Control; 2016, 7; 43-51
2084-2201
Pojawia się w:
Present Problems of Power System Control
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Analyses of temperature and pressure condition in CI engines exhaust pipe in light of application NOx sensor to determine of catalytic converter efficiency
Autorzy:
Rychter, M.
Powiązania:
https://bibliotekanauki.pl/articles/243619.pdf
Data publikacji:
2008
Wydawca:
Instytut Techniczny Wojsk Lotniczych
Tematy:
transport
internal combustion engine
catalytic converter
diagnostic system
Opis:
The development of a catalytic converter required an analysis of selected physical parameters of the supports. This resulted from the necessity to assume given parameters of the supports applied in the tests in exhaust gas environment in the CI engines. An analysis of ionic conductors, which constitutes the basic solution in voltage sensors providing signals through NOx electrocatalysis, is presented. The aim of this paper is to determine the basis for the monitoring of catalytic converters in compression ignition engines by the emission level of a selected exhaust gas component as a diagnostic signal. The emission of NOx has been taken as the basis. This required the development of a specialized system allowing the reduction of NOx and obtaining of a diagnostic signal reflecting the level of the said reduction. This paper includes same results of testing and possibilities monitoring of prototype catalytic converter on the test bed. On the basis of the performed examinations and obtained test results the following conclusions can be drawn: the analysis of the NOx concentrations in exhaust gas from the compression-ignition engine can be based on the indications of the voltage probes with the modified electrodes of the oxygen pump, the application of the reduction conditions in the voltage probes using the nitrogen oxides reduction by the electro-catalytic way depends on the exhaust gas parameters, the values of which change depending on the rotational crankshaft speed and engine load, and for this reason obtaining the diagnostic signal for the whole engine operation range is impossible, the control of the correctness of the catalyst operation regarding the nitrogen oxides reduction can be realised for the defined operating parameters of the tested engine, for phases VIII and X of the ESC test the reheating the test probe installed before the catalyst was unnecessary, owing to the high exhaust gas temperature (737-759°C).
Źródło:
Journal of KONES; 2008, 15, 3; 451-463
1231-4005
2354-0133
Pojawia się w:
Journal of KONES
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
An application of the heat accumulator and improvement of the DC-DC converter for hybrid-electric vehicles
Autorzy:
Kosztyła, T.
Tutaj, J.
Powiązania:
https://bibliotekanauki.pl/articles/245370.pdf
Data publikacji:
2016
Wydawca:
Instytut Techniczny Wojsk Lotniczych
Tematy:
simulation
road transport
DC-DC converter
propulsion system
heating system
hybrid vehicle
Opis:
In this article, both problems of the internal combustion-engine’s thermal equilibrium as well as improving the DC-DC converter’s operation in the hybrid-electric vehicle’s propulsion system. The purpose of the proposed amendments is to increase the energy efficiency of the hybrid-electric vehicle’s propulsion system. Such a hybridelectric vehicle in city traffic is characterized by intermittent operation of the internal combustion engine with long pauses, which causes difficulty in obtaining and maintaining the desired operating temperature of the internal combustion engine, especially at low outdoor temperatures and intensive use of the heating system inside the hybridelectric vehicle. The result is the increased emission of noxious exhaust gas components and increased fuel consumption. The proposed solution to this problem is to apply heat accumulator in the cooling system. It is stored in the waste heat from the cooling system used to obtain and maintain the internal combustion engine’s nominal operating temperature. The paper presents the results of simulation analyses the impact of applying heat accumulator in the hybrid-electric vehicle driving in city traffic, at different ambient conditions, such as: air temperature, internal combustion engine’s load and the frequency and length of stops. The proposed algorithm for controlling the circulation of the cooling liquid ensures as soon as possible to achieve and maintain the internal combustion engine’s temperature. Furthermore, the temperature of the operating medium can be adjusted depending on the operating conditions of the internal combustion engine. Experimental studies, on the example of the Toyota Prius and Yaris, confirmed the desirability of the use of the proposed solution. Improving the DC-DC converter’s current is to change the configuration by the use of a two-phase DC-DC converter – instead of a single-phase DC-DC converter, supplying a DC-AC inverter of the DC motoring the hybrid-electric vehicle’s propulsion system. This article also includes waveforms for comparison of the properties of both DC-DC converters.
Źródło:
Journal of KONES; 2016, 23, 3; 263-270
1231-4005
2354-0133
Pojawia się w:
Journal of KONES
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Poprawa parametrów efektywności energetycznej układu napędowego wentylatora poprzez zastosowanie inteligentnego przemiennika częstotliwości
The improvement of the fan's drive system's energy effectiveness parameters by applying intelligent frequency converter
Autorzy:
Szulc, Z.
Powiązania:
https://bibliotekanauki.pl/articles/1369610.pdf
Data publikacji:
2012
Wydawca:
Sieć Badawcza Łukasiewicz - Instytut Napędów i Maszyn Elektrycznych Komel
Tematy:
układ napędowy wentylatora
przemiennik częstotliwości
frequency converter
drive system
Opis:
There are a few ways of the fan output parameters regulation. The most economical method for the fan rated power above 100kW is regulation of the angle of the blades and rotational speed. The application of intelligent frequency converter, that in various places of work and conditions of supply, allows you to minimize energy losses and then improves the energy parameters of the entire drive system. The paper presents fan drive system, which can be adjusted by two methods described above. As the energy efficiency parameters of the system, were taken values: watt-hour efficiency, power factor taken from the electrical source and the current strain which supplies frequency converter. An equipment taken for the analysis, consisted of: a drive system with induction motor of the medium voltage (6 kV) and power rating 850kW, a high voltage (6kV) frequency converter type current inverter (rectified current circuit DC, type current source) with the possibility of so-called synchronous transfer and fan, that works in one of the national thermoelectric power station. The calculations, which the results were presented in the article, make it possibile to compare the economic effects both methods of the fan output parameters regulation.
Źródło:
Maszyny Elektryczne: zeszyty problemowe; 2012, 2, 95; 31-38
0239-3646
2084-5618
Pojawia się w:
Maszyny Elektryczne: zeszyty problemowe
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Simple Wide Frequency Range Impedance Meter Based on AD5933 Integrated Circuit
Autorzy:
Chabowski, K.
Piasecki, T.
Dzierka, A.
Nitsch, K.
Powiązania:
https://bibliotekanauki.pl/articles/221804.pdf
Data publikacji:
2015
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
impedance
converter
AD5933
system-on-a-chip
measurement
Opis:
As it contains elements of complete digital impedance meter, the AD5933 integrated circuit is an interesting solution for impedance measurements. However, its use for measurements in a wide range of impedances and frequencies requires an additional digital and analogue circuitry. This paper presents the design and performance of a simple impedance meter based on the AD5933 IC. Apart from the AD5933 IC it consists of a clock generator with a programmable prescaler, a novel DC offset canceller for the excitation signal based on peak detectors and a current to voltage converter with switchable conversion ratios. The authors proposed a simple method for choosing the measurement frequency to minimalize errors resulting from the spectral leakage and distortion caused by a lack of an anti-aliasing filter in the DDS generator. Additionally, a novel method for the AD5933 IC calibration was proposed. It consists in a mathematical compensation of the systematic error occurring in the argument of the value returned from the AD5933 IC as a result. The performance of the whole system is demonstrated in an exemplary measurement.
Źródło:
Metrology and Measurement Systems; 2015, 22, 1; 13-24
0860-8229
Pojawia się w:
Metrology and Measurement Systems
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Nowoczesne przekształtnikowe układy napędowe prądu stałego maszyn wyciągowych z cyfrowym układem sterowania i zabezpieczeń
Autorzy:
Gąsior, T.
Powiązania:
https://bibliotekanauki.pl/articles/186445.pdf
Data publikacji:
2010
Wydawca:
Sieć Badawcza Łukasiewicz - Instytut Technik Innowacyjnych EMAG
Tematy:
przekształtnik
układ napędowy
układ sterowania
układ zabezpieczeń
control system
converter
driving system
protection system
Opis:
W artykule zostanie omówiony cyfrowy układ sterowania i zabezpieczeń przekształtników przeznaczonych do zasilania przekształtnikowych układów napędowych maszyn wyciągowych z silnikami prądu stałego. W artykule przedstawiono zagadnienia związane ze sterowaniem przekształtnika w oparciu o algorytmy sterowania 12-pulsowego sekwencyjnego oraz równoczesnego. Ponadto zostanie omówiony system sterowania maszyn wyciągowych dwusilnikowych największych mocy pracujących w układzie Punga oraz w układzie z dwoma obwodami głównymi, opracowany w ITI EMAG.
The articles describes a digital control and protection system for converters used to supply converter driving systems of hoisting machines with DC motors. The article features the issues related to the control of a converter based on the algorithms of 12-pulse sequential and simultaneous control. Additionally, the articles presents a control system of two-motor high-power hoisting machines working in the Punga system and in the system with two main circuits which was developed at EMAG.
Źródło:
Mechanizacja i Automatyzacja Górnictwa; 2010, R. 48, nr 10, 10; 28-34
0208-7448
Pojawia się w:
Mechanizacja i Automatyzacja Górnictwa
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
An autonomous microcontroller system for controlling a multi-channel time counter
Autorzy:
Sondej, D.
Sawicki, M.
Szplet, R.
Powiązania:
https://bibliotekanauki.pl/articles/114671.pdf
Data publikacji:
2015
Wydawca:
Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:
microcontroller
time counter
autonomous system
time-to-digital converter
Opis:
The paper presents the design of a microprocessor system intended for control, data processing and communication in a multi-channel time counter. The time counter is a relatively complex autonomous instrument designed for measurements of time with picosecond precision and frequency within a range of 3.5 GHz. The device employs a high-speed, single-chip microcontroller with event-driven programming without the mediation of an operating system. The autonomous operation of the measurement system with real-time controlling and data processing was achieved. The paper focuses on the hardware design and the software development model which enables collision-free and concurrent work of many components. The device uses advanced mechanisms available in STM32 series microcontrollers, allowing the efficient support for USB and Ethernet interfaces. The microprocessor system works at a relatively low frequency, which minimizes emission of interference and allows measuring time intervals with a high precision.
Źródło:
Measurement Automation Monitoring; 2015, 61, 7; 305-307
2450-2855
Pojawia się w:
Measurement Automation Monitoring
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Influence of A/D quantization in an interpolated DFT based system of power control with a small delay
Autorzy:
Borkowski, J.
Kania, D.
Mroczka, J.
Powiązania:
https://bibliotekanauki.pl/articles/221386.pdf
Data publikacji:
2014
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
photovoltaic system
frequency estimation
signal processing
A/D converter
control of power system
Opis:
Fast and accurate grid signal frequency estimation is a very important issue in the control of renewable energy systems. Important factors that influence the estimation accuracy include the A/D converter parameters in the inverter control system. This paper presents the influence of the number of A/D converter bits b, the phase shift of the grid signal relative to the time window, the width of the time window relative to the grid signal period (expressed as a cycle in range (CiR) parameter) and the number of N samples obtained in this window with the A/D converter on the developed estimation method results. An increase in the number b by 8 decreases the estimation error by approximately 256 times. The largest estimation error occurs when the signal module maximum is in the time window center (for small values of CiR) or when the signal value is zero in the time window center (for large values of CiR). In practical applications, the dominant component of the frequency estimation error is the error caused by the quantization noise, and its range is from approximately 8×10-10 to 6×10-4.
Źródło:
Metrology and Measurement Systems; 2014, 21, 3; 423-432
0860-8229
Pojawia się w:
Metrology and Measurement Systems
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 51

Ta witryna wykorzystuje pliki cookies do przechowywania informacji na Twoim komputerze. Pliki cookies stosujemy w celu świadczenia usług na najwyższym poziomie, w tym w sposób dostosowany do indywidualnych potrzeb. Korzystanie z witryny bez zmiany ustawień dotyczących cookies oznacza, że będą one zamieszczane w Twoim komputerze. W każdym momencie możesz dokonać zmiany ustawień dotyczących cookies