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    Wyświetlanie 1-4 z 4
    Tytuł:
    Design and testing of a low cost peak-power tracking controller for a fixed blade 1.2 kVA wind turbine
    Autorzy:
    Gitano, H.
    Taib, S.
    Khdeir, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/262657.pdf
    Data publikacji:
    2008
    Wydawca:
    Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie
    Tematy:
    wind turbine
    DC-DC converter
    peak power tracking
    power controller
    Opis:
    Wind turbines are a common source of electrical power generation in rural sites around the world. The power generated by a wind turbine at a given wind speed is a non-linear function of rotor speed. This results in a specific rotor speed for maximum power production at each wind speed. A control system incorporating a Pulse Width Modulated DC -DC converter has been designed to vary the load on the wind turbine thereby forcing it to operate at its maximum power point. Another important feature of the controller is the application of electrical stall-breaking of the turbine. The circuit was then tested on a turbine test bed simulating various wind speeds, and the “peak-power tracking” capability and electrical breaking capability were verified. The system gave an overall efficiency of 70 to 80% over a wide range of wind speeds and PWM duty cycles.
    Źródło:
    Electrical Power Quality and Utilisation. Journal; 2008, 14, 1; 95-101
    1896-4672
    Pojawia się w:
    Electrical Power Quality and Utilisation. Journal
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Classical control of the neutral point in 4-wire 3-phase DC-AC converters
    Autorzy:
    Zhong, Q. C.
    Hobson, L.
    Jayne, M. G.
    Powiązania:
    https://bibliotekanauki.pl/articles/262721.pdf
    Data publikacji:
    2005
    Wydawca:
    Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie
    Tematy:
    DC/AC power converter
    neutral leg
    3-phase 4-wire systems
    split DC link
    Opis:
    In this paper, the classical control techniques are applied to the neutral point in a 3-phase 4-wire DC-AC power converter. The converter is intended to be connected to 3-phase 4-wire loads and/or the power grid. The neutral point can be steadily regulated by a simple controller, involving in voltage and current feedback, even when the three-phase converter system (mostly, the load) is extremely unbalanced. The achievable performance is analyzed quantitatively and the parameters of the neutral leg are determined. Simulations show that the proposed theory is very effective.
    Źródło:
    Electrical Power Quality and Utilisation. Journal; 2005, 11, 2; 73-81
    1896-4672
    Pojawia się w:
    Electrical Power Quality and Utilisation. Journal
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Digitally controlled interface between supercapacitor energy storage and DC link
    Autorzy:
    Nowak, M.
    Hildebrandt, J.
    Rabkowski, J.
    Barlik, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/262750.pdf
    Data publikacji:
    2006
    Wydawca:
    Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie
    Tematy:
    supercapacitor energy storage
    DA-AC-DC converter
    digital control
    Opis:
    In the paper specification of a complex converter designed as an interface between a supercapacitor energy storage battery and other DC auxiliary links, with emphasis on its control system, and some laboratory investigation results, is presented. The converter applied in the solution contains a DC/DC power controller and a DC/AC/DC medium frequency intermediate link with a transformer, permitting good voltage matching. Specific control of both cooperating converters in accordance with the proposed solution gives the possibility of synchronized and phase controlled operation of DC/DC and DC/AC converters resulting in the impact on the AC current wave shape. In this way AC link switching and conducting loss minimize and improving of interface efficiency have been emphasized.
    Źródło:
    Electrical Power Quality and Utilisation. Journal; 2006, 12, 2; 27-31
    1896-4672
    Pojawia się w:
    Electrical Power Quality and Utilisation. Journal
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Single sensor based photovoltaic maximum power point tracking technique for solar water pumping system
    Autorzy:
    Daoud, A.
    Midoun, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/262763.pdf
    Data publikacji:
    2008
    Wydawca:
    Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie
    Tematy:
    MPPT
    boost converter
    rmicrocontroller
    DC motor-pump
    flow rate
    Opis:
    The development of photovoltaic (PV) panels has made solar-powered pumps a reality. The pump drivers are usually direct-current (DC) motors which are fed by power electronic converters with maximum power point tracking (MPPT) to extract the whole energy that the PV panels can generate depending on the environmental conditions including irradiation and temperature. The implementation of MPPT algorithm essentially involves sensing both an input current and an input voltage. Understandably, such realization is expensive. In this paper, a solar PV water pumping system based on DC to DC converter as MPPT module is considered. The system consists of a PV array, a DC to DC boost converter and the DC motor coupled to a centrifugal pump. A proposed method is employed to seek the maximum power point using the flow rate obtained from a single sensor. A comparison with conventional hill climbing technique is included in experimental results to prove feasibility of the proposed method.
    Źródło:
    Electrical Power Quality and Utilisation. Journal; 2008, 14, 2; 69-72
    1896-4672
    Pojawia się w:
    Electrical Power Quality and Utilisation. Journal
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-4 z 4

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