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    Wyświetlanie 1-6 z 6
    Tytuł:
    Modelling and control of an omnidirectional mobile manipulator
    Autorzy:
    Djebrani, S.
    Benali, A.
    Abdessemed, F.
    Powiązania:
    https://bibliotekanauki.pl/articles/330102.pdf
    Data publikacji:
    2012
    Wydawca:
    Uniwersytet Zielonogórski. Oficyna Wydawnicza
    Tematy:
    manipulator mobilny
    sterowanie impedancyjne
    logika rozmyta
    holonome mobile manipulators
    input state linearization
    virtual impedance control
    fuzzy logic
    Opis:
    A new approach to control an omnidirectional mobile manipulator is developed. The robot is considered to be an individual agent aimed at performing robotic tasks described in terms of a displacement and a force interaction with the environment. A reactive architecture and impedance control are used to ensure reliable task execution in response to environment stimuli. The mechanical structure of our holonomic mobile manipulator is built of two joint manipulators mounted on a holonomic vehicle. The vehicle is equipped with three driven axles with two spherical orthogonal wheels. Taking into account the dynamical interaction between the base and the manipulator, one can define the dynamics of the mobile manipulator and design a nonlinear controller using the input-state linearization method. The control structure of the robot is built in order to demonstrate the main capabilities regarding navigation and obstacle avoidance. Several simulations were conducted to prove the effectiveness of this approach.
    Źródło:
    International Journal of Applied Mathematics and Computer Science; 2012, 22, 3; 601-616
    1641-876X
    2083-8492
    Pojawia się w:
    International Journal of Applied Mathematics and Computer Science
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Research on improving low-frequency oscillation characteristics of wind power grid-connected power system with doubly-fed wind generator based on virtual impedance power system stabilizer
    Autorzy:
    He, Ping
    Zhu, Yongliang
    Li, Qiuyan
    Fan, Jiale
    Tao, Yukun
    Powiązania:
    https://bibliotekanauki.pl/articles/27309939.pdf
    Data publikacji:
    2023
    Wydawca:
    Polska Akademia Nauk. Czasopisma i Monografie PAN
    Tematy:
    doubly-fed induction wind turbine
    grid-connected wind power
    low frequency oscillation
    power system stabilizer
    virtual impedance
    Opis:
    The grid integration of large-scale wind power will alter the dynamic characteristics of the original system and the power distribution among synchronous machines. Meanwhile, the interaction between wind turbines and synchronous machines will affect the damping oscillation characteristics of the system. The additional damping control of traditional synchronous generators provides an important means for wind turbines to enhance the damping characteristics of the system. To improve the low frequency oscillation characteristics of wind power grid-connected power systems, this paper adds a parallel virtual impedance link to the traditional damping controller and designs a DFIG-PSS-VI controller. In the designed controller, the turbine active power difference is chosen as the input signal based on residual analysis, and the output signal is fed back to the reactive power control loop to obtain the rotor voltage quadrature component. With DigSILENT/PowerFactory, the influence of the controller parameters is analyzed. In addition, based on different tie-line transmission powers, the impact of the controller on the low-frequency oscillation characteristics of the power system is examined through utilizing the characteristic root and time domain simulation analysis.
    Źródło:
    Archives of Electrical Engineering; 2023, 72, 3; 811--826
    1427-4221
    2300-2506
    Pojawia się w:
    Archives of Electrical Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    A decentralized control strategy to bring back frequency and share reactive power in isolated microgrids with virtual power plant
    Autorzy:
    Khanjanzadeh, Amir
    Soleymani, Soodabeh
    Mozafari, Babak
    Powiązania:
    https://bibliotekanauki.pl/articles/2090692.pdf
    Data publikacji:
    2021
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    PFDC
    power-frequency droop control
    VPP
    virtual power plant
    microgrid
    virtual impedance
    decentralized control
    kontrola spadku częstotliwości zasilania
    wirtualna elektrownia
    mikrosieci
    wirtualna impedancja
    zdecentralizowana kontrola
    Opis:
    In this paper, a novel Power-Frequency Droop Control (PFDC) is introduced to perfectly bring back the system frequency and share the reactive power in isolated microgrid with virtual power plant (VPP). The frequency-based power delivery must be essentially implemented in VPP which can operate as a conventional synchronous generator. It has been attained by enhancing the power processing unit of each VPP to operate as an active generator. The inverter coupling impedance which has been assigned by the virtual impedance technique has reduced the affected power coupling resulting from line resistance. The reference has been subsequently adjusted to compensate the frequency deviation caused by load variation and retrieve the VPP frequency to its nominal value. In addition, the line voltage drop has compensated the voltage drop and load sharing error to obliterate the reactive power sharing imprecision resulting from the voltage deviation. The voltage feedback confirms the correct voltage after compensating the voltage drop. As an illustration, conventional PFDC after a load change cannot restore the system frequency which is deviated from 50 Hz and rested in 49.9 Hz while, proposed PFDC strategy fades away the frequency deviation via compensating the variation of the frequency reference. Likewise, the frequency restoration factor ( γ) has an effective role in retrieving the system frequency, i.e., the restoration rate of the system frequency is in proportion with γ. As a whole, the simulation results have pointed to the high performance of proposed strategy in an isolated microgrid.
    Źródło:
    Bulletin of the Polish Academy of Sciences. Technical Sciences; 2021, 69, 1; e136190, 1--9
    0239-7528
    Pojawia się w:
    Bulletin of the Polish Academy of Sciences. Technical Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    A decentralized control strategy to bring back frequency and share reactive power in isolated microgrids with virtual power plant
    Autorzy:
    Khanjanzadeh, Amir
    Soleymani, Soodabeh
    Mozafari, Babak
    Powiązania:
    https://bibliotekanauki.pl/articles/2173517.pdf
    Data publikacji:
    2021
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    PFDC
    power-frequency droop control
    VPP
    virtual power plant
    microgrid
    virtual impedance
    decentralized control
    kontrola spadku częstotliwości zasilania
    elektrownia wirtualna
    mikrosieci
    wirtualna impedancja
    zdecentralizowana kontrola
    Opis:
    In this paper, a novel Power-Frequency Droop Control (PFDC) is introduced to perfectly bring back the system frequency and share the reactive power in isolated microgrid with virtual power plant (VPP). The frequency-based power delivery must be essentially implemented in VPP which can operate as a conventional synchronous generator. It has been attained by enhancing the power processing unit of each VPP to operate as an active generator. The inverter coupling impedance which has been assigned by the virtual impedance technique has reduced the affected power coupling resulting from line resistance. The reference has been subsequently adjusted to compensate the frequency deviation caused by load variation and retrieve the VPP frequency to its nominal value. In addition, the line voltage drop has compensated the voltage drop and load sharing error to obliterate the reactive power sharing imprecision resulting from the voltage deviation. The voltage feedback confirms the correct voltage after compensating the voltage drop. As an illustration, conventional PFDC after a load change cannot restore the system frequency which is deviated from 50 Hz and rested in 49.9 Hz while, proposed PFDC strategy fades away the frequency deviation via compensating the variation of the frequency reference. Likewise, the frequency restoration factor ( γ) has an effective role in retrieving the system frequency, i.e., the restoration rate of the system frequency is in proportion with γ. As a whole, the simulation results have pointed to the high performance of proposed strategy in an isolated microgrid.
    Źródło:
    Bulletin of the Polish Academy of Sciences. Technical Sciences; 2021, 69, 1; art. no. e136190, 1--9
    0239-7528
    Pojawia się w:
    Bulletin of the Polish Academy of Sciences. Technical Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    An automatic system for measurement of impedance active component using a quasi-balanced method
    Autorzy:
    Barwinek, S.
    Cichy, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/114468.pdf
    Data publikacji:
    2015
    Wydawca:
    Stowarzyszenie Inżynierów i Techników Mechaników Polskich
    Tematy:
    virtual instruments
    LabVIEW
    capacitance measurement
    impedance measurement
    resistance measurement
    phase shift measurement
    Opis:
    The paper presents the idea of the possibility of implementing automatic virtual instrument using the quasi ˗ balanced method to measure the active component of impedance (resistance). The system is based on the structure of a non-bridge quasi-balanced circuit. The process of balancing is automatically performed. This meter has been built based on the data acquisition board NI USB-6251 from National Instruments and programming environment LabVIEW. Signal processing is made in an algorithmic way. The measurement of the phase angle is based on short-term Fourier transform. The results of preliminary experimental research are presented in the paper.
    Źródło:
    Measurement Automation Monitoring; 2015, 61, 5; 132-135
    2450-2855
    Pojawia się w:
    Measurement Automation Monitoring
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Automatic system for measuring wood moisture using quasi-balanced method of dielectric loss factor measurement
    Autorzy:
    Barwinek, S.
    Cichy, A.
    Skórkowski, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/114387.pdf
    Data publikacji:
    2016
    Wydawca:
    Stowarzyszenie Inżynierów i Techników Mechaników Polskich
    Tematy:
    wood moisture
    virtual instruments
    impedance measurement
    quasi – balanced method
    dielectric loss factor
    Opis:
    The paper presents an automatic system for measuring the moisture content of wood on the basis of loss factor tanδ. The instrument is based on a structure of the non-bridge, quasi – balanced circuit implemented in a program way. The virtual measuring system uses the data acquisition board NI USB-6251 from National Instruments and LabVIEW environment. The preliminary results of experimental studies were compared with the results of the LCR meters Hioki 3522, MOTECH MIC-4090 and meter of wood humidity Powerfix HG00384C.
    Źródło:
    Measurement Automation Monitoring; 2016, 62, 12; 426-428
    2450-2855
    Pojawia się w:
    Measurement Automation Monitoring
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-6 z 6

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