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    Wyświetlanie 1-11 z 11
    Tytuł:
    Selected solutions in photovoltaic systems increasing their efficiency
    Autorzy:
    Frydrychowicz-Jastrzębska, G.
    Bugała, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/97495.pdf
    Data publikacji:
    2014
    Wydawca:
    Politechnika Poznańska. Wydawnictwo Politechniki Poznańskiej
    Tematy:
    solar cell
    concentrator
    PV module
    power gain
    Opis:
    The basic objective in photovoltaics is obtaining electrical energy with the costs comparable to the costs of energy obtained from conventional fuels. The effectiveness of acquisition of electrical energy from solar cells can be improved, among other things, by using solar radiation concentrators. Photovoltaic systems with low concentration (LCPV) and high concentration (HCPV) were characterised [13]. The possibilities of their operation under various conditions were presented, whereas the impact of temperature and concentration angle were considered in particular. The most modern solutions were presented, including Spin cell, Ephocell, Interdigitated Back Contact (IBC), Luminescent Solar Concentrator (LSC), High Concentration PhotoVoltaic Thermal (HCPVT), Concentration PhotoVoltaic (CPV), Telecontrolli. Results of current Polish research were given. In the years from 1985 to 2010 the increase from 17,5 % to 40,7 % in the efficiency of solar cells with concentrators was achieved [18].
    Źródło:
    Computer Applications in Electrical Engineering; 2014, 12; 462-474
    1508-4248
    Pojawia się w:
    Computer Applications in Electrical Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Ultraszerokopasmowy rozłożony wzmacniacz kaskadowy
    Ultra-broadband distributed cascaded amplifier
    Autorzy:
    Kral, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/320345.pdf
    Data publikacji:
    2006
    Wydawca:
    Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
    Tematy:
    ultraszerokopasmowy
    linia transmisyjna
    rozłożony wzmacniacz kaskadowy
    tranzystor polowy
    tranzystor polowy z nośnikami o dużej ruchliwości
    HEMT
    wzmocnienie mocy
    ultrabroadband
    transmission line
    cascaded single stage distributed amplifier
    high electron mobility transistor
    power gain
    Opis:
    W opracowaniu przedstawiono kaskadowy wzmacniacz rozłożony zdolny do przenoszenia ekstremalnie szerokich pasm częstotliwości przy dużym (multiplikatywnym) wzmocnieniu. Przedstawiono koncepcję wzmacniacza i wyprowadzono zależności na wzmocnienia napięciowe i mocy jego bezstratnej i unilateralnej wersji. Poddano szczegółowej analizie podstawowe bloki wzmacniacza oraz sformułowano kryteria doboru elementów. Przedstawiono też porównawcze wyniki symulacji wzmacniacza ze stratami własnymi użytego modelu tranzystora. Praca ma znaczenie praktyczne, bowiem zaprojektowane zgodnie z nią elementy wzmacniacza mogą stanowić dobre wartości początkowe procesu optymalizacji komputerowej.
    Cascaded Single Stage Distributed Amplifier (CSSDA) is presented. Amplifier gain formulas are derived for lossless and unilateral version. Fundamental parts of amplifier are submitted to detailed discussion and criteria of elements' selection are formulated. Comparative results of amplifier simulation with loss transistor model are quoted. The paper is of practical importance since it shows how to design elements' values which can be good starting point for computer optimization.
    Źródło:
    Elektrotechnika i Elektronika; 2006, 25, 2; 106-112
    1640-7202
    Pojawia się w:
    Elektrotechnika i Elektronika
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Parametric and nonparametric diagnostic models for blades in the rotating machinery with environment elimination
    Autorzy:
    Grądzki, R.
    Golak, K.
    Lindstedt, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/244217.pdf
    Data publikacji:
    2016
    Wydawca:
    Instytut Techniczny Wojsk Lotniczych
    Tematy:
    diagnostic model
    phase shift
    amplitude gain
    power spectral transfer function
    Opis:
    The article presents an analysis of the technical condition of the two blades with different technical conditions (for medium and low wear). It is shown that the evaluation of the blades basis only on the endoscopic research does not provide full information about the technical condition (known only the external condition of the blades). Proposed supplement endoscopic examinations of is the use of two parametric methods (the blades are tested during operation of rotating machine) based on the auto and cross power spectral density functions for the signal measured as displacement of the rotor blade tip y(t). As result of these methods is the portrait of the blades was obtained (in the form of clear colour images providing a degree of a wear), which also includes the internal condition of the blades. The additional complement to parametric methods may be nonparametric method. Auto and cross power spectral density functions (obtained from measurement of the blade tip movement) is a basis to determine the characteristics (abstract step and impulse responses) of each blade. Both parametric methods which nonparametric method clearly confirmed that the technical condition of first considered blade (no. 2) differs from the technical condition of the second blade (no. 22).
    Źródło:
    Journal of KONES; 2016, 23, 2; 137-145
    1231-4005
    2354-0133
    Pojawia się w:
    Journal of KONES
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The influence of parameters of spatial orientation of a solar power receiver on energetic gain
    Autorzy:
    Frydrychowicz-Jastrzębska, G.
    Bugała, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/376423.pdf
    Data publikacji:
    2012
    Wydawca:
    Politechnika Poznańska. Wydawnictwo Politechniki Poznańskiej
    Tematy:
    solar radiation
    Liu-Jordan method
    solar power receiver
    energetic gain
    Opis:
    The paper characterizes selected mathematical models for calculating power density of solar radiation incident on the plane inclined with regard to the base and directed at proper azimuth angle with regard to southern direction. Analysis of the presented methods is carried out and for purposes of further consideration the Liu-Jordan model has been adopted. The paper presents the results of power density of solar radiation obtained from computer simulation, with reference to a day, month, and year, in graphical form. Power gain at different spatial settings of the receiver was determined.
    Źródło:
    Poznan University of Technology Academic Journals. Electrical Engineering; 2012, 70; 181-188
    1897-0737
    Pojawia się w:
    Poznan University of Technology Academic Journals. Electrical Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Design and Performance Analysis of a Tripleband Rectangular Slot Microstrip Patch Antenna for Wi-Fi, Wi-MAX and Satellite Applications
    Autorzy:
    Hossain, Md. Biplop
    Hossain, Md. Faruque
    Powiązania:
    https://bibliotekanauki.pl/articles/2055262.pdf
    Data publikacji:
    2022
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    wireless communication
    triple band antenna
    gain
    directivity
    transmission power
    link budget
    Opis:
    A triple-band microstrip patch antenna is presented in this article with detail investigation of its working mechanism and performance characteristics. The antenna consists of a rectangular slot on the patch to achieve multiband operation. Three distinct frequencies of 2.4 GHz, 5.5 GHz and 7.5 GHz are achieved with return losses of 27 dB, 29 dB and 29 dB respectively. The Impedance Bandwidths are 70 MHz (2.52 GHz-2.44 GHz) at 2.4 GHz, 220 MHz (5.65 GHz-5.43 GHz) at 5.5 GHz and 250 MHz (7.57 GHz-7.32 GHz) at 7.5 GHz, which satisfy the requirements of Wi-Fi, Wi-MAX and satellite communications bands. The fabricated prototype of the antenna has total dimension of 53×53×1.6 mm³ over FR4 substrate. The antenna is simple and has sensible radiation characteristics with considerable gain. This work also focuses on developing a Link Budget model for its application in satellite communication. Most notably, it examines overall system efficiency and optimum path loss, distance analysis, system noise temperature, signal to noise power ratio, the size of antenna and the overall customer satisfactions. The highest gain of the antenna is achieved as 3.5 dB in the band (5.65 GHz-5.43 GHz), while the highest directivity and bandwidth are found as 8.7 dBi and 250 MHz respectively in the higher operating band. The affordable agreement between the simulated and measuring outcomes justifies that the antenna is often applicable for Wi-Fi (2.4 GHz), Wi-MAX (5.25 – 5.85 GHz) and satellite (7.24 – 7.57 GHz) communications.
    Źródło:
    International Journal of Electronics and Telecommunications; 2022, 68, 2; 217--222
    2300-1933
    Pojawia się w:
    International Journal of Electronics and Telecommunications
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Research on interaction of APFs based on relative gain array
    Autorzy:
    Feng, X.
    Sun, T.
    Ma, W.
    Powiązania:
    https://bibliotekanauki.pl/articles/141523.pdf
    Data publikacji:
    2018
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    interaction effect
    relative gain array
    active power filter
    Norton equivalent
    LCL filter
    Opis:
    Different APFs (Active Power Filter) interact with each other when multiple APFs are connected to the grid, and the interactions deteriorate the control performance of APFs and even lead to system instability. This paper presents a method to analyze the dynamic interaction of multiple APFs in a weak grid. This method uses the Norton equivalent principle to establish the mathematical model of a single APF. The mathematical model of the multiple APFs connected to the grid is set up based on the single APF mode. The RGA (Relative Gain Array) principle is used to analyze the interactions among multiple APFs. Besides, this paper analyzes the effect of changing circuit parameters and controller parameters on the change of the interactions. The strategy of weakening and eliminating the interaction is proposed based on rational selection and combination of parameters. Analysis, along with time domain simulation and experimental results, is presented to verify the feasibility and effectiveness of the proposed method and strategy.
    Źródło:
    Archives of Electrical Engineering; 2018, 67, 1; 165-177
    1427-4221
    2300-2506
    Pojawia się w:
    Archives of Electrical Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Korekcja właściwości metrologicznych przetworników szybkozmiennych sygnałów elektronicznych
    Correction of metrological properties for fast changing electronic signal of transducer
    Autorzy:
    Dominikowski, B.
    Pacholski, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/268966.pdf
    Data publikacji:
    2016
    Wydawca:
    Politechnika Gdańska. Wydział Elektrotechniki i Automatyki
    Tematy:
    scalone przetworniki mocy
    korekcja współczynnika wzmocnienia
    wzmacniacze o programowalnym współczynniku wzmocnienia
    integrated power transducer
    correction of gain factor
    programmable gain amplifier
    Opis:
    Autorzy przedstawili w sposób syntetyczny mankamenty wejściowych wzmacniaczy programowalnych stosowanych w układach wejściowych przetworników pomiarowych oraz zaprezentowali sposób działania scalonych układów o wzmocnieniu regulowanym napięciowo. W artykule przestawiono także możliwości wykorzystania ww. wzmacniaczy w układzie automatycznej korekcji wzmocnienia toru prądowego przetwornika mocy czynnej lub licznika energii elektrycznej.
    The authors of this paper presented in synthetic way the metrological drawbacks of input programmable operational amplifier used in the input channel of integrated transducer also shown the principle of operation integrated operational amplifier with programmable gain. In this paper authors also presented the capability of using mentioned earlier in paper operational amplifier in automatic gain correction circuit in the current channel of active power transducer or watt-hours meter.
    Źródło:
    Zeszyty Naukowe Wydziału Elektrotechniki i Automatyki Politechniki Gdańskiej; 2016, 49; 21-24
    1425-5766
    2353-1290
    Pojawia się w:
    Zeszyty Naukowe Wydziału Elektrotechniki i Automatyki Politechniki Gdańskiej
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Modeling of boost DC/DC pulse converter with regard of conduction power losses for continuous current mode
    Modelowanie przetwornicy DC/DC podwyższającej napięcie z uwzględnieniem strat mocy przewodzenia przy ciągłym prądzie łącznika diodowego
    Autorzy:
    Pawlak, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/402456.pdf
    Data publikacji:
    2012
    Wydawca:
    Politechnika Świętokrzyska w Kielcach. Wydawnictwo PŚw
    Tematy:
    switching mode power converter
    boost converter
    energy efficiency
    voltage gain
    tryb przełączania przetwornicy
    konwerter mocy
    efektywność energetyczna
    wzmocnienie napięcia
    Opis:
    Boost DC/DC pulse converter structure with regard to conduction power losses for Continuous Current Mode has been analyzed in the paper. Simplified model of converter which takes into account the nonlinearity of the static characteristic switches was usedfor theoretical analysis. The models of the transistor and diode whose static characteristic are modeled as in series connection ideal electronic switch, the constant voltage source and dynamic effective resistance have been used. The dynamic losses of powers occurring in the switching process of electronic switches were not captured in the work. The proposed model of the converter has the use in the case, when it works at low switching frequencies, when the losses of switching are considerably smaller than the losses of conductivity. This land of model is useful, particularly in the case of the converter supplied the low voltage, when the voltages loss on electronic switches is significant. Analysis was performed for Continuous Current Mode (CCM) with voltage step up. Results of theoretical analysis have been presented and were verified by simulation. TCAD circuit simulator was used for simulation. Simulations confirm results of theoretical analysis.
    Źródło:
    Structure and Environment; 2012, 4, 2; 27-35
    2081-1500
    Pojawia się w:
    Structure and Environment
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    A family of high-power multilevel switched capacitor-based resonant DC-DC converters – operational parameters and novel concepts of topologies
    Autorzy:
    Stala, R.
    Piróg, S.
    Penczek, A.
    Kawa, A.
    Waradzyn, Z.
    Mondzik, A.
    Skała, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/953065.pdf
    Data publikacji:
    2017
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    DC-DC converter
    high power converters
    resonant converter
    high voltage gain
    zero current switching
    przetwornica DC/DC
    konwerter
    moc
    wysokie napięcie
    Opis:
    This paper presents the concept of topologies and investigation results of switched-capacitor voltage multipliers designed for application in high power systems. The analyzed family of multilevel converters includes established topologies as well as novel concepts. The application of thyristors as well as the invention of novel concepts of multiplier topologies and appropriate control make it possible to achieve high efficiency, high voltage gain, reliable and simple DC-DC converters for high power systems. Based on analytical models of the SCVMs, the paper presents a discussion of the selection of components and the efficiency of the converters as a function of converted power as well as the voltage range on the input and the output side. The results are supported by computer simulations and demonstrative experimental tests.
    Źródło:
    Bulletin of the Polish Academy of Sciences. Technical Sciences; 2017, 65, 5; 639-651
    0239-7528
    Pojawia się w:
    Bulletin of the Polish Academy of Sciences. Technical Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Low-power open loop multiply-by-two amplifier with gain-accuracy improved by local-feedback
    Autorzy:
    Gama, R.
    Galhardo, A.
    Goes, J.
    Paulino, R.
    Neves, R.
    Horta, N.
    Powiązania:
    https://bibliotekanauki.pl/articles/397851.pdf
    Data publikacji:
    2010
    Wydawca:
    Politechnika Łódzka. Wydział Mikroelektroniki i Informatyki
    Tematy:
    ADC
    przetwornik analogowo-cyfrowy
    pomnożyć przez dwa
    mała moc
    przepustowy czas
    pozyskiwanie dokładności
    ADC (analog to digital converter)
    multiply by two
    low power
    time interleaved
    gain accuracy
    Opis:
    This paper proposes the complete electrical design of a new multiply-by-two amplifier to be readily used in ultra high-speed medium resolution pipeline ADC stages. It is based in a switched-capacitor open-loop structure but with the novelty of having the gain accuracy improved by using an active amplifier with local feedback. Simulation results demonstrate that, with a very low-power dissipation and without employing any digital self-calibration or gain-control techniques, the circuit exhibits, over PVT corner and device mismatches, a dynamic performance and a gain-accuracy compatible with 6-bit level.
    Źródło:
    International Journal of Microelectronics and Computer Science; 2010, 1, 1; 19-24
    2080-8755
    2353-9607
    Pojawia się w:
    International Journal of Microelectronics and Computer Science
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Robust estimation based nonlinear higher order sliding mode control strategies for PMSG-WECS
    Autorzy:
    Nazir, Awais
    Khan, Safdar Abbas
    Khan, Malak Adnan
    Alam, Zaheer
    Khan, Imran
    Irfan, Muhammad
    Rehman, Saifur
    Nowakowski, Grzegorz
    Powiązania:
    https://bibliotekanauki.pl/articles/27311430.pdf
    Data publikacji:
    2023
    Wydawca:
    Polska Akademia Nauk. Czasopisma i Monografie PAN
    Tematy:
    wind energy conversion systems
    WECS
    robust control
    maximum power point tracking
    MPPT
    sliding mode control
    SMC
    super-twisting algorithm
    STA
    high gain observer
    artificial neural network
    ANN
    function fitting
    backstepping
    śledzenie maksymalnego punktu mocy
    obserwator o dużym wzmocnieniu
    sztuczna sieć neuronowa
    dopasowanie funkcji
    system konwersji energii wiatrowej
    sterowanie odporne
    sterowanie ślizgowe
    algorytm super skręcania
    Opis:
    The wind energy conversion systems (WECS) suffer from an intermittent nature of source (wind) and the resulting disparity between power generation and electricity demand. Thus, WECS are required to be operated at maximum power point (MPP). This research paper addresses a sophisticated MPP tracking (MPPT) strategy to ensure optimum (maximum) power out of the WECS despite environmental (wind) variations. This study considers a WECS (fixed pitch, 3KW, variable speed) coupled with a permanent magnet synchronous generator (PMSG) and proposes three sliding mode control (SMC) based MPPT schemes, a conventional first order SMC (FOSMC), an integral back-stepping-based SMC (IBSMC) and a super-twisting reachability-based SMC, for maximizing the power output. However, the efficacy of MPPT/control schemes rely on availability of system parameters especially, uncertain/nonlinear dynamics and aerodynamic terms, which are not commonly accessible in practice. As a remedy, an off-line artificial function-fitting neural network (ANN) based on Levenberg-Marquardt algorithm is employed to enhance the performance and robustness of MPPT/control scheme by effectively imitating the uncertain/nonlinear drift terms in the control input pathways. Furthermore, the speed and missing derivative of a generator shaft are determined using a high-gain observer (HGO). Finally, a comparison is made among the stated strategies subjected to stochastic and deterministic wind speed profiles. Extensive MATLAB/Simulink simulations assess the effectiveness of the suggested approaches.
    Źródło:
    Bulletin of the Polish Academy of Sciences. Technical Sciences; 2023, 71, 5; art. no. e147063
    0239-7528
    Pojawia się w:
    Bulletin of the Polish Academy of Sciences. Technical Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-11 z 11

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