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    Wyświetlanie 1-7 z 7
    Tytuł:
    Efficiency of maximum power point tracking in photovoltaic system under variable solar irradiance
    Autorzy:
    Marańda, W.
    Piotrowicz, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/200627.pdf
    Data publikacji:
    2014
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    photovoltaics
    MPP-tracking
    inverter efficiency
    fotowoltaika
    śledzenie
    MPP
    sprawność falownika
    Opis:
    Field conditions decrease the energy output of photovoltaic (PV) systems, mainly due to excessive temperatures. However, in regions with moderate ambient temperatures, as in Poland, solar energy is commonly delivered with highly fluctuating irradiance. This introduces yet another source of energy losses due to the non-ideal tracking of actual position of Maximum Power Point (MPP). Majority of PV-systems are equipped with DC/AC and grid-connected inverter. Since the solar energy flux is variable, an adequate MPP-tracking algorithm is required to handle a wide range of load levels and face rapid changes of input power. Along with the essential DC/AC conversion, the quality of MPP-tracking must also be taken into account in evaluation of inverter efficiency. The tracking in dynamic conditions has been addressed only recently. Several algorithms has been studied theoretically, experimentally or in laboratory conditions by applying artificial input test-patterns. This work takes the opposite approach by applying the recorded real-life solar irradiance and simulating the tracking behavior to study the problem for true field conditions in Poland. The simulation uses the unique high-quality irradiance data collected with 200 ms time resolution. The calculation of both static and dynamic MPP-tracking efficiency has been performed for representative variable-cloudy day, applying commonly used Perturb&Observe tracking algorithm.
    Źródło:
    Bulletin of the Polish Academy of Sciences. Technical Sciences; 2014, 62, 4; 713-721
    0239-7528
    Pojawia się w:
    Bulletin of the Polish Academy of Sciences. Technical Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Układy śledzące punkt maksymalnej mocy w inwerterach stosowanych w instalacjach fotowoltaicznych
    Systems follow the maximum power point in inverters used in photovoltaic installations
    Autorzy:
    Trzmiel, G.
    Powiązania:
    https://bibliotekanauki.pl/articles/377415.pdf
    Data publikacji:
    2016
    Wydawca:
    Politechnika Poznańska. Wydawnictwo Politechniki Poznańskiej
    Tematy:
    instalacja fotowoltaiczna
    PV
    inwerter
    MPP tracker
    punkt maksymalnej mocy
    Opis:
    W pracy przedstawiono możliwości stosowania różnych algorytmów poszukiwania punktów maksymalnej mocy w instalacjach fotowoltaicznych (PV). Wspomniano o różnych sposobach zwiększania sprawności systemów PV i uzysków energii elektrycznej. Dokonano przeglądu stosowanych inwerterów (falowników) ze względu na kilka kryteriów. Przedstawiono również celowość stosowania oraz funkcjonalność układów śledzących punkt maksymalnej mocy, które wchodzą w skład inwerterów. Zwrócono uwagę na podstawowe zasady doboru różnych rodzajów inwerterów. Główną częścią pracy jest charakterystyka najczęściej stosowanych algorytmów pracy układów śledzących punkt maksymalnej mocy.
    The paper presents the possibility of using different algorithms to search for the point of maximum power in installations of photovoltaic (PV). Mentioned about different ways to increase the efficiency of PV systems and electricity yields. Overview of the inverters due to several criteria was made. Also presented the desirability of the use and functionality of the systems tracking the maximum power point, which are included in the inverters. Attention was drawn to the basic principles for the selection of different types of inverters. The main part of the paper is the characteristic of the most commonly used circuits tracking the maximum power point algorithms.
    Źródło:
    Poznan University of Technology Academic Journals. Electrical Engineering; 2016, 87; 23-35
    1897-0737
    Pojawia się w:
    Poznan University of Technology Academic Journals. Electrical Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Study of Single Sensor Based Maximum Power Point Tracking Techniques for Solar Water Pumping System
    Autorzy:
    Daoud, A.
    Midoun, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/262773.pdf
    Data publikacji:
    2009
    Wydawca:
    Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie
    Tematy:
    MPP
    buck converter
    microcontroller
    motor-pump
    tachometer
    pressure sensor
    Opis:
    This paper describes new techniques of maximum power point (MPP) tracking for solar water pumping system. The latter system consists of a PV array, a DC/DC buck converter and a universal motor coupled to a centrifugal pump. A conventional hill climbing method is employed to seek the MPP using the motor-pump rotation speed or the pump outlet pressure information. Experimental results are presented and a comparison with conventional algorithm which requires both voltage and current sensors is provided.
    Źródło:
    Electrical Power Quality and Utilisation. Journal; 2009, 15, 2; 23-27
    1896-4672
    Pojawia się w:
    Electrical Power Quality and Utilisation. Journal
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Sensitivity analysis of a new approach to photovoltaic parameters extraction based on the total least squares method
    Autorzy:
    Mesbahi, Oumaima
    Tlemçani, Mouhaydine
    Janeiro, Fernando M.
    Hajjaji, Abdeloawahed
    Kandoussi, Khalid
    Powiązania:
    https://bibliotekanauki.pl/articles/2052125.pdf
    Data publikacji:
    2021
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    photovoltaic modules
    parameter extraction
    total least squares
    MPP
    sensitivity analysis
    Opis:
    The degradation of photovoltaic modules and their subsequent loss of performance has a serious impact on the total energy generation potential. The lack of real-time information on the output power leads to additional losses since the panels may not be operating at their optimal point. To understand the behaviour, numerically simulate the characteristics and identify the optimal operating point of a photovoltaic cell, the parameters of an equivalent electrical circuit must first be identified. The aim of this work is to develop a total least-squares based algorithm which can identify those parameters from the output voltage and current measurements, taking into consideration the uncertainties on both measured quantities. This work presents a comparative study of the Ordinary Least Squares (OLS) and Total Least Squares (TLS) approaches to the estimation of the parameters of a photovoltaic cell.
    Źródło:
    Metrology and Measurement Systems; 2021, 28, 4; 751-765
    0860-8229
    Pojawia się w:
    Metrology and Measurement Systems
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Optimisation of Multistep Cavity Configuration to Extend Absorption Bandwidth of Micro Perforated Panel Absorber
    Autorzy:
    Falsafi, I.
    Ohadi, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/176825.pdf
    Data publikacji:
    2018
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    micro perforated panel
    MPP
    multistep cavity
    absorption bandwidth
    optimisation
    impedance tube
    Opis:
    Micro perforated panel (MPP) absorber is a new form of acoustic absorbing material in comparison with porous ones. These absorbers are considered as next generation ones and the best alternative for traditional porous materials like foams. MPP combined with a uniform air gap constructs an absorber which has high absorption but in a narrow bandwidth of frequency. This characteristic makes MPPAs insufficient for practical purposes in comparison with porous materials. In this study instead of using a uniform air gap behind the MPP, the cavity is divided into several partitions with different depth arrangement which have parallel faces. This method improves the absorption bandwidth to reach the looked for goal. To achieve theoretical absorption of this absorber, equivalent electro-acoustic circuit and Maa’s theory (MAA, 1998) are employed. Maa suggested formulas to calculate MPP’s impedance which show good match with experimental results carried out in previous studies. Electro-acoustic analogy is used to combine MPP’s impedance with acoustic impedances of complex partitioned cavity. To verify the theoretical analyses, constructed samples are experimentally tested via impedance tube. To establish the test, a multi-depth setup facing a MPP is inserted into impedance tube and the absorption coefficient is examined in the 63-1600 Hz frequency range. Theoretical results show good agreement compared to measured data, by which a conclusion can be made that partitioning the cavity behind MPP into different depths will improve absorption bandwidth and the electro-acoustic analogy is an appropriate theoretical method for absorption enhancement research, although an optimisation process is needed to achieve best results to prove the capability of this absorber. The optimisation process provides maximum possible absorption in a desired frequency range for a specified cavity configuration by giving the proper cavity depths. In this article numerical optimisation has been done to find cavity depths for a unique MPP.
    Źródło:
    Archives of Acoustics; 2018, 43, 2; 187-195
    0137-5075
    Pojawia się w:
    Archives of Acoustics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Static and dynamic MPP-tracking efficiency of PV-inverter using recorded irradiance
    Autorzy:
    Marańda, W.
    Piotrowicz, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/397987.pdf
    Data publikacji:
    2013
    Wydawca:
    Politechnika Łódzka. Wydział Mikroelektroniki i Informatyki
    Tematy:
    photovoltaics
    MPP-tracking
    PV inverter
    tracking efficiency
    fotowoltaika
    śledzenie punktu mocy maksymalnej
    przekształtnik PV
    efektywność śledzenia
    Opis:
    This paper investigates the energy losses introduced by Maximum Power Point Tracking operation of photovoltaic (PV) inverter. In contrast to other studies, this evaluation has been done with the recorded real-life solar irradiance data applied to the simulation of the PV-generator and tracking algorithm. The true MPP output of photovoltaic generator has been calculated with electro-thermal model and the simulation has been carried out with 1 s time resolution. The efficiency results have been presented for both static and dynamic MPP-tracking investigated With basic and simplified Perturb&Observe algorithm with several tracking speed rates. In addition to the simulation, the inverter efficiency measurements for field- installed inverter have been presented.
    Źródło:
    International Journal of Microelectronics and Computer Science; 2013, 4, 4; 181-185
    2080-8755
    2353-9607
    Pojawia się w:
    International Journal of Microelectronics and Computer Science
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-7 z 7

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